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test(mock-compiler): make testing the stencil compiler and it's outputs easier #3127

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wants to merge 22 commits into from
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test(mock-compiler): make testing the stencil compiler and it's outputs easier #3127

wants to merge 22 commits into from

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johnjenkins
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@johnjenkins johnjenkins commented Oct 29, 2021 •
edited
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Pull request checklist

Please check if your PR fulfills the following requirements:

  • Tests for the changes have been added (for bug fixes / features)
  • Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Build (npm run build) was run locally and any changes were pushed
  • Unit tests (npm test) were run locally and passed
  • E2E Tests (npm run test.karma.prod) were run locally and passed
  • Prettier (npm run prettier) was run locally and passed

Pull request type

Please check the type of change your PR introduces:

  • Bugfix
  • Feature
  • Refactoring (no functional changes, no api changes)
  • Build related changes
  • Documentation content changes
  • Other (please describe):
    Testing

What is the current behavior?

At present there is no easy way to test the stencil compiler end-to-end.
The stencil compiler is the main backbone of stencil - designed to run on a fileSytem on disk, it collects a bunch of input files and outputs different bundles according to the outputTargets defined in stencil.config.

What is the new behavior?

A new 'mock-compiler' suite has been added. This sets up a series of 'sensible' config defaults, setup files (all of which can be overwritten) and a hybrid fileSystem which can read real files on disk whilst writing all new files to memory.

Does this introduce a breaking change?

  • Yes
  • No

Testing

I have re-written 7 (currently defunct) legacy compiler tests to use the new mock-compiler. They all run and pass.

Other information

@johnjenkins johnjenkins requested a review from a team October 29, 2021 15:56
John Jenkins and others added 6 commits October 29, 2021 17:16
@splitinfinities splitinfinities added Feature: Testing Resolution: Refine This PR is marked for Jira refinement. We're not working on it - we're talking it through. labels Nov 1, 2021
@johnjenkins
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johnjenkins commented Apr 25, 2022 •
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Any reason this one went under the radar? Feel it was a quite small risk to quite a large potential reward ratio :)
The reason I made it originally was to demonstrate some bugs and write tests for the fixes I made to the stencil plugin flow.

@rwaskiewicz
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@johnjenkins you're right - the reward is pretty large here and having these tests back up and running is something we've been actively talking about. @alicewriteswrongs is doing some work around the dist-custom-elements output target, and is probably feeling this pain quite a bit right now. Once that work is complete, we plan to circle back to this and take some of the things she's learned from working on that output target into account (but Alice can correct me if I'm wrong here)

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@rwaskiewicz
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@johnjenkins you're right - the reward is pretty large here and having these tests back up and running is something we've been actively talking about. @alicewriteswrongs is doing some work around the dist-custom-elements output target, and is probably feeling this pain quite a bit right now. Once that work is complete, we plan to circle back to this and take some of the things she's learned from working on that output target into account (but Alice can correct me if I'm wrong here)

@alicewriteswrongs alicewriteswrongs mentioned this pull request May 16, 2022
Merged
14 tasks
John Jenkins and others added 4 commits June 23, 2022 12:13
Merge branch 'stencil-main' into test-mock-compiler
6ee6def 
# Conflicts:
#	package-lock.json
#	src/compiler/build/full-build.ts
#	src/compiler/config/validate-config.ts
#	src/compiler/output-targets/test/output-targets-dist.spec.ts
#	src/compiler/output-targets/test/output-targets-www.spec.ts
#	src/compiler/service-worker/test/service-worker.spec.ts
#	src/compiler/style/test/build-conditionals.spec.ts
#	src/compiler/style/test/style.spec.ts
#	src/testing/tsconfig.internal.json
Merge branch 'stencil-main' into test-mock-compiler
c6a97fe 
# Conflicts:
#	src/compiler/output-targets/test/output-targets-dist.spec.ts
#	src/compiler/output-targets/test/output-targets-www-dist.spec.ts
#	src/compiler/output-targets/test/output-targets-www.spec.ts
#	src/declarations/stencil-public-compiler.ts
@johnjenkins
Merge branch 'main' into test-mock-compiler
12a0984
Merge branch 'stencil-main' into test-mock-compiler
1af6642 
# Conflicts:
#	src/cli/task-build.ts
#	src/compiler/build/full-build.ts
#	src/compiler/output-targets/test/output-targets-dist.spec.ts
#	src/compiler/output-targets/test/output-targets-www-dist.spec.ts
#	src/compiler/output-targets/test/output-targets-www.spec.ts
#	src/compiler/plugin/test/plugin.spec.ts
#	src/compiler/service-worker/test/service-worker.spec.ts
#	src/compiler/style/test/build-conditionals.spec.ts
#	src/compiler/style/test/style.spec.ts
#	src/testing/mocks.ts
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github-actions bot commented Aug 30, 2022 •
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--strictNullChecks error report

Typechecking with --strictNullChecks resulted in 2363 errors on this branch.

Unfortunately, it looks like that's an increase of 89 over main 😞.

Violations Not on `main` (may be more than the count above)
Path Location Error Message
src/cli/task-build.ts (38, 9) TS2345 Argument of type 'BuildResultsComponentGraph | undefined' is not assignable to parameter of type 'BuildResultsComponentGraph'. Type 'undefined' is not assignable to type 'BuildResultsComponentGraph'.
src/compiler/build/build.ts (44, 7) TS2322 Type 'null' is not assignable to type 'BuildCtx'.
src/compiler/build/full-build.ts (15, 9) TS2322 Type 'null' is not assignable to type 'WatchOfConfigFile'.
src/compiler/build/full-build.ts (36, 11) TS2322 Type 'null' is not assignable to type 'WatchOfConfigFile'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (24, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (25, 7) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (33, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (34, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (46, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (46, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (47, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (47, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (48, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-dist.spec.ts (49, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (13, 40) TS2322 Type 'null' is not assignable to type 'string[]'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (13, 52) TS2322 Type 'null' is not assignable to type 'string[]'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (13, 69) TS2322 Type 'null' is not assignable to type 'string[]'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (41, 7) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (49, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-www-dist.spec.ts (50, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/output-targets/test/output-targets-www.spec.ts (21, 11) TS2532 Object is possibly 'undefined'.
src/compiler/output-targets/test/output-targets-www.spec.ts (22, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (35, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (47, 54) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (65, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (100, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (146, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (191, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/plugin/test/plugin.spec.ts (193, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/service-worker/test/service-worker.spec.ts (27, 11) TS2532 Object is possibly 'undefined'.
src/compiler/service-worker/test/service-worker.spec.ts (28, 11) TS2532 Object is possibly 'undefined'.
src/compiler/service-worker/test/service-worker.spec.ts (29, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/service-worker/test/service-worker.spec.ts (36, 11) TS2532 Object is possibly 'undefined'.
src/compiler/service-worker/test/service-worker.spec.ts (36, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/service-worker/test/service-worker.spec.ts (41, 29) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/build-conditionals.spec.ts (21, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (32, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (38, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (60, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (84, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (109, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (119, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (137, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (163, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/build-conditionals.spec.ts (189, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (17, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (21, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (38, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (42, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (65, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (66, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (79, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (79, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (80, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (80, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (110, 5) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (114, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (114, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (115, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (116, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (125, 27) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (137, 5) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (141, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (142, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (145, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (146, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (165, 5) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (169, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (169, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (170, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (171, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/compiler/style/test/style.spec.ts (174, 11) TS2532 Object is possibly 'undefined'.
src/compiler/style/test/style.spec.ts (175, 17) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (24, 28) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (25, 57) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (39, 44) TS2345 Argument of type 'CompilerWatcher | undefined' is not assignable to parameter of type 'CompilerWatcher'. Type 'undefined' is not assignable to type 'CompilerWatcher'.
src/dev-server/index.ts (64, 7) TS2322 Type 'null' is not assignable to type 'CompilerBuildResults'.
src/dev-server/index.ts (65, 7) TS2322 Type 'null' is not assignable to type 'DevServer'.
src/dev-server/index.ts (66, 7) TS2322 Type 'null' is not assignable to type 'BuildOnEventRemove'.
src/dev-server/index.ts (67, 7) TS2322 Type 'null' is not assignable to type '() => void'.
src/dev-server/index.ts (71, 7) TS2322 Type 'null' is not assignable to type '(msg: DevServerMessage) => void'.
src/dev-server/index.ts (76, 18) TS2769 No overload matches this call. Overload 1 of 2, '(timeoutId: Timeout): void', gave the following error. Argument of type 'Timeout | null' is not assignable to parameter of type 'Timeout'. Type 'null' is not assignable to type 'Timeout'. Overload 2 of 2, '(id?: number | undefined): void', gave the following error. Argument of type 'Timeout | null' is not assignable to parameter of type 'number | undefined'. Type 'null' is not assignable to type 'number | undefined'.
src/dev-server/index.ts (83, 7) TS2322 Type 'null' is not assignable to type 'DevServer'.
src/dev-server/index.ts (89, 7) TS2322 Type 'null' is not assignable to type '(msg: DevServerMessage) => void'.
src/dev-server/index.ts (112, 18) TS2769 No overload matches this call. Overload 1 of 2, '(timeoutId: Timeout): void', gave the following error. Argument of type 'Timeout | null' is not assignable to parameter of type 'Timeout'. Type 'null' is not assignable to type 'Timeout'. Overload 2 of 2, '(id?: number | undefined): void', gave the following error. Argument of type 'Timeout | null' is not assignable to parameter of type 'number | undefined'.
src/dev-server/index.ts (113, 5) TS2322 Type 'DevServerConfig | undefined' is not assignable to type 'DevServerConfig'. Type 'undefined' is not assignable to type 'DevServerConfig'.
src/dev-server/index.ts (119, 7) TS2322 Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (120, 7) TS2322 Type 'number | undefined' is not assignable to type 'number'. Type 'undefined' is not assignable to type 'number'.
src/dev-server/index.ts (121, 7) TS2322 Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (126, 5) TS2322 Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'.
src/dev-server/index.ts (135, 11) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (136, 35) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (136, 60) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (136, 83) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (137, 18) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (139, 36) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (139, 61) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (139, 84) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (141, 18) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (143, 40) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (143, 65) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (143, 88) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (146, 47) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (146, 73) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (153, 20) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (153, 46) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (156, 14) TS2532 Object is possibly 'undefined'.
src/dev-server/index.ts (171, 16) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (21, 5) TS2322 Type 'null' is not assignable to type 'Promise'.
src/testing/mock-compiler/index.ts (52, 25) TS2322 Type 'CompilerSystem | null' is not assignable to type 'CompilerSystem | undefined'. Type 'null' is not assignable to type 'CompilerSystem | undefined'.
src/testing/mock-compiler/index.ts (62, 3) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (63, 3) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (91, 9) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (91, 40) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mock-compiler/index.ts (93, 27) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (94, 5) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (104, 38) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (105, 5) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (115, 8) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (115, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mock-compiler/index.ts (116, 5) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (116, 40) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mock-compiler/index.ts (118, 8) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (118, 42) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mock-compiler/index.ts (119, 5) TS2532 Object is possibly 'undefined'.
src/testing/mock-compiler/index.ts (119, 40) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mock-compiler/index.ts (142, 39) TS2345 Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mocks.ts (60, 35) TS2322 Type 'string | undefined' is not assignable to type 'string'. Type 'undefined' is not assignable to type 'string'.
src/testing/mocks.ts (67, 5) TS2322 Type 'null' is not assignable to type 'ConfigBundle[] | undefined'.
src/testing/mocks.ts (72, 5) TS2322 Type 'null' is not assignable to type 'string | undefined'.
src/testing/mocks.ts (82, 5) TS2322 Type 'null' is not assignable to type 'OutputTarget[] | undefined'.
src/testing/mocks.ts (90, 5) TS2322 Type 'null' is not assignable to type 'TestingConfig | undefined'.
src/testing/mocks.ts (132, 5) TS2322 Type 'null' is not assignable to type 'string'.
src/testing/mocks.ts (137, 5) TS2322 Type 'null' is not assignable to type 'Cache'.
src/testing/mocks.ts (140, 5) TS2322 Type 'null' is not assignable to type '{ access: (filePath: string) => Promise; accessSync: (filePath: string) => boolean; cancelDeleteDirectoriesFromDisk: (dirPaths: string[]) => void; cancelDeleteFilesFromDisk: (filePaths: string[]) => void; ... 17 more ...; writeFiles: (files: { ...; } | Map<...>, opts?: FsWriteOptions | undefined) => Promise...'.
src/testing/mocks.ts (143, 5) TS2322 Type 'null' is not assignable to type 'CompilerBuildResults'.
src/testing/mocks.ts (153, 33) TS2345 Argument of type 'CompilerSystem | undefined' is not assignable to parameter of type 'CompilerSystem'. Type 'undefined' is not assignable to type 'CompilerSystem'.
src/testing/mocks.ts (159, 37) TS2532 Object is possibly 'undefined'.
src/testing/mocks.ts (159, 37) TS2345 Argument of type 'CompilerSystem | undefined' is not assignable to parameter of type 'CompilerSystem'. Type 'undefined' is not assignable to type 'CompilerSystem'.
src/testing/mocks.ts (220, 30) TS2322 Type 'null' is not assignable to type 'string'.
src/testing/mocks.ts (225, 28) TS2322 Type 'null' is not assignable to type 'string'.
src/testing/testing.ts (73, 13) TS2322 Type 'null' is not assignable to type 'Promise'.

reports and statistics

Our most error-prone files
Path Error Count
src/compiler/config/test/validate-dev-server.spec.ts 45
src/compiler/config/test/validate-output-www.spec.ts 40
src/screenshot/connector-base.ts 40
src/dev-server/index.ts 38
src/mock-doc/serialize-node.ts 36
src/compiler/sys/tests/in-memory-fs.spec.ts 34
src/screenshot/screenshot-compare.ts 33
src/compiler/transformers/test/parse-props.spec.ts 32
src/dev-server/server-process.ts 32
src/runtime/vdom/vdom-render.ts 30
src/compiler/style/test/style.spec.ts 28
src/compiler/sys/typescript/typescript-config.ts 28
src/testing/spec-page.ts 28
src/compiler/build/build-stats.ts 27
src/compiler/output-targets/dist-lazy/generate-lazy-module.ts 26
src/compiler/prerender/prerender-main.ts 25
src/sys/node/test/worker-manager.spec.ts 24
src/compiler/plugin/plugin.ts 23
src/compiler/style/test/optimize-css.spec.ts 23
src/compiler/sys/in-memory-fs.ts 23
Our most common errors
Typescript Error Code Count Error messages
TS2532 728
Error messages Object is possibly 'undefined'.
TS2345 720
Error messages Argument of type 'string | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type '"g" | "prerender" | "build" | "docs" | "serve" | "version" | "info" | "generate" | "telemetry" | "test" | null' is not assignable to parameter of type 'TaskCommand'.
Type 'null' is not assignable to type 'TaskCommand'.

Argument of type '"g" | "prerender" | "build" | "docs" | "serve" | "info" | "generate" | "telemetry" | "test" | null' is not assignable to parameter of type 'TaskCommand'.
Type 'null' is not assignable to type 'TaskCommand'.

Argument of type '"g" | "prerender" | "build" | "docs" | "serve" | "generate" | "telemetry" | "test" | null' is not assignable to parameter of type 'TaskCommand'.
Type 'null' is not assignable to type 'TaskCommand'.

Argument of type 'CompilerSystem | undefined' is not assignable to parameter of type 'CompilerSystem'.
Type 'undefined' is not assignable to type 'CompilerSystem'.

Argument of type 'BuildResultsComponentGraph | undefined' is not assignable to parameter of type 'BuildResultsComponentGraph'.
Type 'undefined' is not assignable to type 'BuildResultsComponentGraph'.

Argument of type 'Promise<(() => void) | null>' is not assignable to parameter of type 'Promise<() => void>'.

Argument of type 'null' is not assignable to parameter of type 'BuildResultsComponentGraph'.

Argument of type 'DevServerConfig | undefined' is not assignable to parameter of type 'StencilDevServerConfig'.
Type 'undefined' is not assignable to type 'StencilDevServerConfig'.

Argument of type 'Promise<(() => void) | null>' is not assignable to parameter of type 'Promise<() => void>'.
Type '(() => void) | null' is not assignable to type '() => void'.
Type 'null' is not assignable to type '() => void'.

Argument of type 'boolean | null | undefined' is not assignable to parameter of type 'boolean | undefined'.
Type 'null' is not assignable to type 'boolean | undefined'.

Argument of type 'number | undefined' is not assignable to parameter of type 'number'.
Type 'undefined' is not assignable to type 'number'.

Argument of type 'ComponentRuntimeHostListener[] | undefined' is not assignable to parameter of type 'ComponentRuntimeHostListener[]'.
Type 'undefined' is not assignable to type 'ComponentRuntimeHostListener[]'.

Argument of type 'HTMLScriptElement | null | undefined' is not assignable to parameter of type 'HTMLScriptElement'.
Type 'undefined' is not assignable to type 'HTMLScriptElement'.

Argument of type 'string | null' is not assignable to parameter of type 'string'.
Type 'null' is not assignable to type 'string'.

Argument of type 'Logger | undefined' is not assignable to parameter of type 'Logger'.
Type 'undefined' is not assignable to type 'Logger'.

Argument of type 'string[] | undefined' is not assignable to parameter of type 'string[]'.
Type 'undefined' is not assignable to type 'string[]'.

Argument of type 'string' is not assignable to parameter of type 'never'.

Argument of type 'Diagnostic[] | undefined' is not assignable to parameter of type 'readonly Diagnostic[]'.
Type 'undefined' is not assignable to type 'readonly Diagnostic[]'.

Argument of type 'boolean | undefined' is not assignable to parameter of type 'boolean'.

Argument of type 'BuildConditionals | undefined' is not assignable to parameter of type 'BuildConditionals'.
Type 'undefined' is not assignable to type 'BuildConditionals'.

Argument of type 'Diagnostic[] | undefined' is not assignable to parameter of type 'Diagnostic[]'.
Type 'undefined' is not assignable to type 'Diagnostic[]'.

Argument of type 'WorkerMeta | undefined' is not assignable to parameter of type 'WorkerMeta'.
Type 'undefined' is not assignable to type 'WorkerMeta'.

Argument of type 'CopyTask[] | undefined' is not assignable to parameter of type 'boolean | CopyTask[]'.

Argument of type '{ type: "copy"; dir: string | undefined; copy: d.CopyTask[]; }' is not assignable to parameter of type 'OutputTargetCopy | OutputTargetDistCustomElementsBundle'.
Types of property 'dir' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'CopyTask[] | undefined' is not assignable to parameter of type 'boolean | CopyTask[]'.
Type 'undefined' is not assignable to type 'boolean | CopyTask[]'.

Argument of type '{ type: "copy"; dir: string | undefined; copy: CopyTask[]; }' is not assignable to parameter of type 'OutputTargetCopy | OutputTargetDistCustomElements | OutputTargetDistTypes'.
Types of property 'dir' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'OutputTargetWww' is not assignable to parameter of type 'never'.

Argument of type 'string | null | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'Set<string | null>' is not assignable to parameter of type 'Set'.
Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Argument of type 'Set<string | null>' is not assignable to parameter of type 'Set'.

Argument of type 'RollupConfig | undefined' is not assignable to parameter of type 'RollupConfig'.
Type 'undefined' is not assignable to type 'RollupConfig'.

Argument of type '(string[] | undefined)[]' is not assignable to parameter of type 'string[][]'.
Type 'string[] | undefined' is not assignable to type 'string[]'.
Type 'undefined' is not assignable to type 'string[]'.

Argument of type 'ComponentCompilerMeta | undefined' is not assignable to parameter of type 'ComponentCompilerMeta'.
Type 'undefined' is not assignable to type 'ComponentCompilerMeta'.

Argument of type 'true | Object | undefined' is not assignable to parameter of type 'boolean | Object | null'.
Type 'undefined' is not assignable to type 'boolean | Object | null'.

Argument of type 'SourceTarget | undefined' is not assignable to parameter of type 'SourceTarget'.
Type 'undefined' is not assignable to type 'SourceTarget'.

Argument of type 'boolean | undefined' is not assignable to parameter of type 'boolean'.
Type 'undefined' is not assignable to type 'boolean'.

Argument of type '(string | undefined)[]' is not assignable to parameter of type 'string[]'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type '(string | undefined)[]' is not assignable to parameter of type 'string[]'.

Argument of type 'RollupSourceMap | undefined' is not assignable to parameter of type 'SourceMap'.
Type 'undefined' is not assignable to type 'SourceMap'.

Argument of type 'EntryModule | undefined' is not assignable to parameter of type 'EntryModule'.
Type 'undefined' is not assignable to type 'EntryModule'.

Argument of type '(Module | undefined)[]' is not assignable to parameter of type 'Module[]'.
Type 'Module | undefined' is not assignable to type 'Module'.
Type 'undefined' is not assignable to type 'Module'.

Argument of type 'Document | null' is not assignable to parameter of type 'Document'.
Type 'null' is not assignable to type 'Document'.

Argument of type 'Document | null' is not assignable to parameter of type 'Node | MockNode'.
Type 'null' is not assignable to type 'Node | MockNode'.

Argument of type 'HydrateAnchorElement' is not assignable to parameter of type '{ [attrName: string]: string; }'.
'string' index signatures are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'URL | null' is not assignable to parameter of type 'URL'.
Type 'null' is not assignable to type 'URL'.

Argument of type 'SitemapXmpResults | null' is not assignable to parameter of type 'SitemapXmpResults'.
Type 'null' is not assignable to type 'SitemapXmpResults'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | URL'.

Argument of type 'Map<string, string[]> | undefined' is not assignable to parameter of type 'Map<string, string[]>'.
Type 'undefined' is not assignable to type 'Map<string, string[]>'.

Argument of type 'undefined' is not assignable to parameter of type 'string'.

Argument of type 'ServiceWorkerConfig | undefined' is not assignable to parameter of type 'ServiceWorkerConfig'.
Type 'undefined' is not assignable to type 'ServiceWorkerConfig'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | URL'.
Type 'undefined' is not assignable to type 'string | URL'.

Argument of type 'CssNode[] | null | undefined' is not assignable to parameter of type 'void | CssNode[]'.

Argument of type 'CssNode[] | null | undefined' is not assignable to parameter of type 'void | CssNode[]'.
Type 'null' is not assignable to type 'void | CssNode[]'.

Argument of type 'null' is not assignable to parameter of type 'string'.

Argument of type 'CompilerSystemCreateDirectoryOptions | undefined' is not assignable to parameter of type 'CompilerSystemCreateDirectoryOptions'.
Type 'undefined' is not assignable to type 'CompilerSystemCreateDirectoryOptions'.

Argument of type 'null' is not assignable to parameter of type 'CompilerFileWatcherEvent'.

Argument of type 'null' is not assignable to parameter of type '{ access: (filePath: string) => Promise; accessSync: (filePath: string) => boolean; cancelDeleteDirectoriesFromDisk: (dirPaths: string[]) => void; cancelDeleteFilesFromDisk: (filePaths: string[]) => void; ... 17 more ...; writeFiles: (files: { ...; } | Map<...>, opts?: FsWriteOptions | undefined) => Promise...'.

Argument of type 'undefined' is not assignable to parameter of type 'TypeChecker'.

Argument of type 'CollectionBundleManifest[] | undefined' is not assignable to parameter of type 'any[]'.
Type 'undefined' is not assignable to type 'any[]'.

Argument of type 'Module | undefined' is not assignable to parameter of type 'Module'.
Type 'undefined' is not assignable to type 'Module'.

Argument of type 'NodeArray | undefined' is not assignable to parameter of type 'NodeArray | HeritageClause[]'.
Type 'undefined' is not assignable to type 'NodeArray | HeritageClause[]'.

Argument of type 'Block | undefined' is not assignable to parameter of type 'Block'.
Type 'undefined' is not assignable to type 'Block'.

Argument of type 'undefined' is not assignable to parameter of type 'readonly ParameterDeclaration[]'.

Argument of type 'Expression | undefined' is not assignable to parameter of type 'Expression'.
Type 'undefined' is not assignable to type 'Expression'.

Argument of type 'Symbol | undefined' is not assignable to parameter of type 'Symbol'.
Type 'undefined' is not assignable to type 'Symbol'.

Argument of type 'string | false' is not assignable to parameter of type 'string'.
Type 'boolean' is not assignable to type 'string'.

Argument of type 'TypeNode | undefined' is not assignable to parameter of type 'Node'.
Type 'undefined' is not assignable to type 'Node'.

Argument of type '(PropertyAssignment | null)[]' is not assignable to parameter of type 'readonly ObjectLiteralElementLike[]'.
Type 'PropertyAssignment | null' is not assignable to type 'ObjectLiteralElementLike'.
Type 'null' is not assignable to type 'ObjectLiteralElementLike'.

Argument of type 'Signature | undefined' is not assignable to parameter of type 'Signature'.
Type 'undefined' is not assignable to type 'Signature'.

Argument of type '(PropertyAssignment | null)[]' is not assignable to parameter of type 'readonly ObjectLiteralElementLike[]'.

Argument of type 'Identifier | undefined' is not assignable to parameter of type 'Node'.
Type 'undefined' is not assignable to type 'Node'.

Argument of type 'undefined' is not assignable to parameter of type 'readonly ClassElement[]'.

Argument of type 'null' is not assignable to parameter of type 'Config | undefined'.

Argument of type 'Config | undefined' is not assignable to parameter of type 'Config'.
Type 'undefined' is not assignable to type 'Config'.

Argument of type 'null' is not assignable to parameter of type 'CollectionCompilerMeta'.

Argument of type 'PropertyName | undefined' is not assignable to parameter of type 'PropertyName'.
Type 'undefined' is not assignable to type 'PropertyName'.

Argument of type 'NamedExportBindings | undefined' is not assignable to parameter of type 'Node'.
Type 'undefined' is not assignable to type 'Node'.

Argument of type 'Declaration | undefined' is not assignable to parameter of type 'Node'.
Type 'undefined' is not assignable to type 'Node'.

Argument of type 'Identifier | undefined' is not assignable to parameter of type 'string | BindingName'.
Type 'undefined' is not assignable to type 'string | BindingName'.

Argument of type 'ScriptTarget | undefined' is not assignable to parameter of type 'ScriptTarget | CreateSourceFileOptions'.
Type 'undefined' is not assignable to type 'ScriptTarget | CreateSourceFileOptions'.

Argument of type 'Diagnostic' is not assignable to parameter of type 'DiagnosticWithLocation'.
Types of property 'file' are incompatible.
Type 'SourceFile | undefined' is not assignable to type 'SourceFile'.
Type 'undefined' is not assignable to type 'SourceFile'.

Argument of type '(...pathSegments: string[]) => string | undefined' is not assignable to parameter of type '(...args: string[]) => string'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'OpenInEditorCallback | undefined' is not assignable to parameter of type 'OpenInEditorCallback'.
Type 'undefined' is not assignable to type 'OpenInEditorCallback'.

Argument of type 'CompilerWatcher | undefined' is not assignable to parameter of type 'CompilerWatcher'.
Type 'undefined' is not assignable to type 'CompilerWatcher'.

Argument of type '{ editor: string | undefined; }' is not assignable to parameter of type 'OpenInEditorOptions'.
Types of property 'editor' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Argument of type 'string | undefined' is not assignable to parameter of type 'PathLike'.
Type 'undefined' is not assignable to type 'PathLike'.

Argument of type 'DevServerConfig | undefined' is not assignable to parameter of type 'DevServerConfig'.
Type 'undefined' is not assignable to type 'DevServerConfig'.

Argument of type 'CompilerBuildResults | undefined' is not assignable to parameter of type 'CompilerBuildResults'.
Type 'undefined' is not assignable to type 'CompilerBuildResults'.

Argument of type 'Window | undefined' is not assignable to parameter of type 'Window'.
Type 'undefined' is not assignable to type 'Window'.

Argument of type 'SerializeDocumentOptions | undefined' is not assignable to parameter of type 'HydrateDocumentOptions'.
Type 'undefined' is not assignable to type 'HydrateDocumentOptions'.

Argument of type 'HydrateDocumentOptions | undefined' is not assignable to parameter of type 'HydrateDocumentOptions'.
Type 'undefined' is not assignable to type 'HydrateDocumentOptions'.

Argument of type 'MockNode | null' is not assignable to parameter of type 'MockNode'.
Type 'null' is not assignable to type 'MockNode'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | null'.
Type 'undefined' is not assignable to type 'string | null'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | null'.

Argument of type 'ShadowRoot | null' is not assignable to parameter of type 'Node'.
Type 'null' is not assignable to type 'Node'.

Argument of type 'MockElement' is not assignable to parameter of type 'MockHTMLElement'.
Types of property 'namespaceURI' are incompatible.
Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Argument of type 'null' is not assignable to parameter of type 'string | Node'.

Argument of type 'null' is not assignable to parameter of type 'string | boolean | undefined'.

Argument of type '(Window & typeof globalThis) | null' is not assignable to parameter of type 'Window'.
Type 'null' is not assignable to type 'Window'.

Argument of type 'string | null | undefined' is not assignable to parameter of type 'string | undefined'.

Argument of type 'HostRef | undefined' is not assignable to parameter of type 'HostRef'.
Type 'undefined' is not assignable to type 'HostRef'.

Argument of type 'this' is not assignable to parameter of type 'HostElement'.
Type 'HostElement' is not assignable to type 'import("/home/runner/work/stencil/stencil/src/declarations/stencil-private").HostElement'.
The types returned by 'componentOnReady()' are incompatible between these types.
Type 'Promise | undefined' is not assignable to type 'Promise'.
Type 'undefined' is not assignable to type 'Promise'.

Argument of type 'this' is not assignable to parameter of type 'HostElement'.

Argument of type 'string | null' is not assignable to parameter of type 'string | undefined'.

Argument of type 'PropertyDescriptor | undefined' is not assignable to parameter of type 'PropertyDescriptor & ThisType'.
Type 'undefined' is not assignable to type 'PropertyDescriptor & ThisType'.
Type 'undefined' is not assignable to type 'PropertyDescriptor'.

Argument of type 'HTMLElement | undefined' is not assignable to parameter of type 'HTMLElement'.
Type 'undefined' is not assignable to type 'HTMLElement'.

Argument of type 'HostElement | undefined' is not assignable to parameter of type 'HostElement'.
Type 'undefined' is not assignable to type 'HostElement'.

Argument of type 'HostElement | undefined' is not assignable to parameter of type 'EventTarget'.
Type 'undefined' is not assignable to type 'EventTarget'.

Argument of type 'HostElement | undefined' is not assignable to parameter of type 'Element'.
Type 'undefined' is not assignable to type 'Element'.

Argument of type 'VNode[] | undefined' is not assignable to parameter of type 'VNode[]'.
Type 'undefined' is not assignable to type 'VNode[]'.

Argument of type 'null | undefined' is not assignable to parameter of type 'ChildType'.
Type 'undefined' is not assignable to type 'ChildType'.

Argument of type 'VNode | null' is not assignable to parameter of type 'ChildType'.
Type 'null' is not assignable to type 'ChildType'.

Argument of type 'VNode | undefined' is not assignable to parameter of type 'ChildType'.
Type 'undefined' is not assignable to type 'ChildType'.

Argument of type 'VNode | null | undefined' is not assignable to parameter of type 'ChildType'.
Type 'undefined' is not assignable to type 'ChildType'.

Argument of type 'null | undefined' is not assignable to parameter of type 'ChildType'.

Argument of type 'RenderNode | undefined' is not assignable to parameter of type 'Node | null'.
Type 'undefined' is not assignable to type 'Node | null'.

Argument of type 'VNode | undefined' is not assignable to parameter of type 'VNode'.
Type 'undefined' is not assignable to type 'VNode'.

Argument of type 'null' is not assignable to parameter of type 'VNode'.

Argument of type 'RenderNode | undefined' is not assignable to parameter of type 'Node'.
Type 'undefined' is not assignable to type 'Node'.

Argument of type 'null' is not assignable to parameter of type 'RenderNode'.

Argument of type 'ScreenshotDiff | undefined' is not assignable to parameter of type 'ScreenshotDiff'.
Type 'undefined' is not assignable to type 'ScreenshotDiff'.

Argument of type 'string | undefined' is not assignable to parameter of type 'PathLike'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | SemVer'.
Type 'undefined' is not assignable to type 'string | SemVer'.

Argument of type 'string | undefined' is not assignable to parameter of type 'string | SemVer'.

Argument of type 'null' is not assignable to parameter of type 'number | undefined'.

Argument of type 'null' is not assignable to parameter of type 'number | PromiseLike'.

Argument of type 'CompilerWorkerTask | undefined' is not assignable to parameter of type 'CompilerWorkerTask'.
Type 'undefined' is not assignable to type 'CompilerWorkerTask'.

Argument of type 'null' is not assignable to parameter of type 'CompilerWorkerTask'.

Argument of type 'undefined' is not assignable to parameter of type 'ErrorHandler'.

Argument of type 'string | undefined' is not assignable to parameter of type 'MockRequestInfo'.
Type 'undefined' is not assignable to type 'MockRequestInfo'.

Argument of type 'string | undefined' is not assignable to parameter of type 'MockRequestInfo'.

Argument of type 'MockResponse | undefined' is not assignable to parameter of type 'MockResponse'.
Type 'undefined' is not assignable to type 'MockResponse'.

Argument of type 'this' is not assignable to parameter of type 'E2EElementInternal'.
Type 'E2EElement' is not assignable to type 'E2EElementInternal'.
Types of property 'find' are incompatible.
Type '(selector: string) => Promise<E2EElement | null>' is not assignable to type '(selector: FindSelector) => Promise'.

Argument of type 'string | null | undefined' is not assignable to parameter of type 'SerializableOrJSHandle'.
Type 'undefined' is not assignable to type 'SerializableOrJSHandle'.

Argument of type 'this' is not assignable to parameter of type 'E2EElementInternal'.

Argument of type 'ElementHandle | null' is not assignable to parameter of type 'ElementHandle'.
Type 'null' is not assignable to type 'ElementHandle'.

Argument of type '{ viewport: EmulateViewport | undefined; userAgent: string | undefined; }' is not assignable to parameter of type '{ viewport: Viewport; userAgent: string; }'.
Types of property 'viewport' are incompatible.
Type 'EmulateViewport | undefined' is not assignable to type 'Viewport'.
Type 'undefined' is not assignable to type 'Viewport'.

Argument of type 'AnyHTMLElement | undefined' is not assignable to parameter of type 'RuntimeRef'.
Type 'undefined' is not assignable to type 'RuntimeRef'.

Argument of type 'null' is not assignable to parameter of type 'SourceMap | undefined'.
TS2322 556
Error messages Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'string | null | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'null' is not assignable to type 'DevServerConfig | undefined'.

Type 'boolean | null | undefined' is not assignable to type 'boolean | undefined'.

Type 'null' is not assignable to type 'DevServer'.

Type 'boolean | null | undefined' is not assignable to type 'boolean'.
Type 'undefined' is not assignable to type 'boolean'.

Type 'boolean | null | undefined' is not assignable to type 'boolean'.

Type 'undefined' is not assignable to type 'number'.

Type 'TaskCommand | null' is not assignable to type 'TaskCommand'.
Type 'null' is not assignable to type 'TaskCommand'.

Type 'PackageJsonData | null' is not assignable to type 'PackageJsonData'.
Type 'null' is not assignable to type 'PackageJsonData'.

Type 'null' is not assignable to type 'OutputTarget[] | undefined'.

Type 'undefined' is not assignable to type 'ComponentConstructor | Promise'.

Type 'HTMLElement | null' is not assignable to type 'HTMLElement'.
Type 'null' is not assignable to type 'HTMLElement'.

Type '({ type: "chunk"; fileName: string; map: SourceMap | undefined; code: string; moduleFormat: ModuleFormat | undefined; entryKey: string; imports: string[]; isEntry: boolean; ... 4 more ...; content?: undefined; } | { ...; })[]' is not assignable to type 'RollupResult[]'.
Type '{ type: "chunk"; fileName: string; map: SourceMap | undefined; code: string; moduleFormat: ModuleFormat | undefined; entryKey: string; imports: string[]; isEntry: boolean; ... 4 more ...; content?: undefined; } | { ...; }' is not assignable to type 'RollupResult'.
Type '{ type: "chunk"; fileName: string; map: SourceMap | undefined; code: string; moduleFormat: ModuleFormat | undefined; entryKey: string; imports: string[]; isEntry: boolean; ... 4 more ...; content?: undefined; }' is not assignable to type 'RollupResult'.
Type '{ type: "chunk"; fileName: string; map: SourceMap | undefined; code: string; moduleFormat: ModuleFormat | undefined; entryKey: string; imports: string[]; isEntry: boolean; ... 4 more ...; content?: undefined; }' is not assignable to type 'RollupChunkResult'.
Types of property 'moduleFormat' are incompatible.
Type 'ModuleFormat | undefined' is not assignable to type 'ModuleFormat'.
Type 'undefined' is not assignable to type 'ModuleFormat'.

Type 'null' is not assignable to type 'CompilerBuildResults'.

Type 'undefined' is not assignable to type 'string'.

Type 'null' is not assignable to type 'string'.

Type 'undefined' is not assignable to type 'Document'.

Type 'null' is not assignable to type 'Promise'.

Type 'null' is not assignable to type 'LoggerTimeSpan'.

Type 'boolean | undefined' is not assignable to type 'boolean'.

Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.

Type 'boolean | "prod" | undefined' is not assignable to type 'boolean | "prod"'.
Type 'undefined' is not assignable to type 'boolean | "prod"'.

Type 'BuildResultsComponentGraph | undefined' is not assignable to type 'BuildResultsComponentGraph'.
Type 'undefined' is not assignable to type 'BuildResultsComponentGraph'.

Type 'RollupResults | undefined' is not assignable to type 'RollupResults'.
Type 'undefined' is not assignable to type 'RollupResults'.

Type '{ name: string | undefined; source: string; tags: any[]; }[]' is not assignable to type '{ name: string; source: string; tags: string[]; }[]'.
Type '{ name: string | undefined; source: string; tags: any[]; }' is not assignable to type '{ name: string; source: string; tags: string[]; }'.
Types of property 'name' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'null' is not assignable to type 'BuildCtx'.

Type 'null' is not assignable to type 'CompilerWorkerContext'.

Type 'null' is not assignable to type 'WatchOfConfigFile'.

Type 'null' is not assignable to type 'Promise<(void | void[])[]>'.

Type 'Promise<(void | void[] | null)[]>' is not assignable to type 'Promise<(void | void[])[]>'.
Type '(void | void[] | null)[]' is not assignable to type '(void | void[])[]'.
Type 'void | void[] | null' is not assignable to type 'void | void[]'.
Type 'null' is not assignable to type 'void | void[]'.

Type 'null' is not assignable to type '{ program: WatchOfConfigFile; rebuild: () => void; }'.

Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Type 'null' is not assignable to type 'string | undefined'.

Type 'string' is not assignable to type 'never'.

Type 'null' is not assignable to type 'never'.

Type 'never[]' is not assignable to type 'never'.

Type '{ code: string; exports: string[]; workerMsgId: string; dependencies: string[]; } | null' is not assignable to type 'WorkerMeta | undefined'.
Type 'null' is not assignable to type 'WorkerMeta | undefined'.

Type 'WorkerMeta | undefined' is not assignable to type 'WorkerMeta'.
Type 'undefined' is not assignable to type 'WorkerMeta'.

Type 'CompilerSystem | undefined' is not assignable to type 'CompilerSystem'.
Type 'undefined' is not assignable to type 'CompilerSystem'.

Type 'Logger | undefined' is not assignable to type 'Logger'.
Type 'undefined' is not assignable to type 'Logger'.

Type 'import("/home/runner/work/stencil/stencil/src/compiler/cache").Cache' is not assignable to type 'import("/home/runner/work/stencil/stencil/src/declarations/stencil-private").Cache'.
The types returned by 'get(...)' are incompatible between these types.
Type 'Promise<string | null>' is not assignable to type 'Promise'.

Type 'null' is not assignable to type 'ValidatedConfig'.
Type 'null' is not assignable to type 'Config'.

Type 'null' is not assignable to type 'string[]'.

Type '{ dir: string; buildDir: string; collectionDir: string | null; typesDir: string; esmLoaderPath: string; copy: d.CopyTask[]; polyfills: boolean | undefined; empty: boolean; type: "dist"; }' is not assignable to type 'Required'.
Types of property 'polyfills' are incompatible.
Type 'boolean | undefined' is not assignable to type 'boolean'.

Type 'string | undefined' is not assignable to type 'never'.
Type 'undefined' is not assignable to type 'never'.

Type 'boolean | undefined' is not assignable to type 'never'.
Type 'undefined' is not assignable to type 'never'.

Type 'boolean' is not assignable to type 'never'.

Type 'CopyTask[]' is not assignable to type 'never'.

Type 'null' is not assignable to type 'number | undefined'.

Type 'null' is not assignable to type 'HistoryApiFallback | undefined'.

Type 'null' is not assignable to type 'CopyTask[] | undefined'.

Type '{ dirPath: string; filePath: string; fileName: string; readmePath: string; usagesDir: string; tag: string; readme: string | undefined; usage: JsonDocsUsage; docs: string; docsTags: CompilerJsDocTagInfo[]; ... 11 more ...; listeners: JsonDocsListener[]; }[]' is not assignable to type 'JsonDocsComponent[]'.
Type '{ dirPath: string; filePath: string; fileName: string; readmePath: string; usagesDir: string; tag: string; readme: string | undefined; usage: d.JsonDocsUsage; docs: string; docsTags: d.CompilerJsDocTagInfo[]; ... 11 more ...; listeners: d.JsonDocsListener[]; }' is not assignable to type 'JsonDocsComponent'.
Types of property 'readme' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'string[] | undefined' is not assignable to type 'string[]'.
Type 'undefined' is not assignable to type 'string[]'.

Type '{ name: string; type: string; mutable: boolean; attr: string | undefined; reflectToAttr: boolean; docs: string; docsTags: CompilerJsDocTagInfo[]; default: string | undefined; deprecation: string | undefined; values: JsonDocsValue[]; optional: boolean; required: boolean; }[]' is not assignable to type 'JsonDocsProp[]'.
Type '{ name: string; type: string; mutable: boolean; attr: string | undefined; reflectToAttr: boolean; docs: string; docsTags: d.CompilerJsDocTagInfo[]; default: string | undefined; deprecation: string | undefined; values: d.JsonDocsValue[]; optional: boolean; required: boolean; }' is not assignable to type 'JsonDocsProp'.
Types of property 'default' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type '{ name: string; type: string; mutable: false; attr: string; reflectToAttr: false; docs: string; docsTags: never[]; default: undefined; deprecation: undefined; values: JsonDocsValue[]; optional: true; required: false; }[]' is not assignable to type 'JsonDocsProp[]'.
Type '{ name: string; type: string; mutable: false; attr: string; reflectToAttr: false; docs: string; docsTags: never[]; default: undefined; deprecation: undefined; values: d.JsonDocsValue[]; optional: true; required: false; }' is not assignable to type 'JsonDocsProp'.
Types of property 'default' are incompatible.
Type 'undefined' is not assignable to type 'string'.

Type '(ComponentCompilerMeta | undefined)[]' is not assignable to type 'ComponentCompilerMeta[]'.
Type 'ComponentCompilerMeta | undefined' is not assignable to type 'ComponentCompilerMeta'.
Type 'undefined' is not assignable to type 'ComponentCompilerMeta'.

Type '(ComponentCompilerMeta | undefined)[][]' is not assignable to type 'readonly ComponentCompilerMeta[][]'.
Type '(ComponentCompilerMeta | undefined)[]' is not assignable to type 'ComponentCompilerMeta[]'.

Type 'null' is not assignable to type 'boolean | SourceMapOptions | undefined'.

Type 'null' is not assignable to type 'SourceMap | undefined'.

Type '{ name: string | undefined; tags: string[]; }[]' is not assignable to type 'CollectionDependencyData[]'.
Type '{ name: string | undefined; tags: string[]; }' is not assignable to type 'CollectionDependencyData'.
Types of property 'name' are incompatible.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'string | undefined' is not assignable to type 'string | number'.
Type 'undefined' is not assignable to type 'string | number'.

Type 'SourceMap | undefined' is not assignable to type 'SourceMap'.
Type 'undefined' is not assignable to type 'SourceMap'.

Type 'string | null' is not assignable to type 'string | undefined'.
Type 'null' is not assignable to type 'string | undefined'.

Type 'null' is not assignable to type 'Function'.

Type 'null' is not assignable to type 'Map<string, string[]>'.

Type 'null' is not assignable to type 'PrerenderConfig'.

Type 'null' is not assignable to type 'Set'.

Type 'null' is not assignable to type 'HydrateAnchorElement[]'.

Type 'null' is not assignable to type '(prerenderRequest: PrerenderUrlRequest) => Promise'.

Type 'CssNode | null' is not assignable to type 'void | CssNode'.
Type 'null' is not assignable to type 'void | CssNode'.

Type 'CssNode | null' is not assignable to type 'CssNode'.
Type 'null' is not assignable to type 'CssNode'.

Type 'CssNode | null' is not assignable to type 'void | CssNode'.

Type 'RegExpExecArray | null' is not assignable to type 'RegExpExecArray'.
Type 'null' is not assignable to type 'RegExpExecArray'.

Type 'null' is not assignable to type '() => string'.

Type 'null' is not assignable to type 'number'.

Type 'null' is not assignable to type 'boolean'.

Type 'null' is not assignable to type 'boolean | undefined'.

Type 'FsItem | undefined' is not assignable to type 'FsItem'.
Type 'undefined' is not assignable to type 'FsItem'.

Type 'null' is not assignable to type 'CompilerFileWatcherCallback[]'.

Type '(key: string) => string | undefined' is not assignable to type '(key: string) => string'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type '(p: string) => Promise<string | undefined>' is not assignable to type '{ (p: string): Promise; (p: string, encoding: "utf8"): Promise; (p: string, encoding: "binary"): Promise; }'.
Type 'Promise<string | undefined>' is not assignable to type 'Promise'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type '(p: string) => string | undefined' is not assignable to type '(p: string, encoding?: string | undefined) => string'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type '((maxConcurrentWorkers: number) => WorkerMainController) | null' is not assignable to type '((maxConcurrentWorkers: number) => WorkerMainController) | undefined'.
Type 'null' is not assignable to type '((maxConcurrentWorkers: number) => WorkerMainController) | undefined'.

Type 'null' is not assignable to type 'ResolvedModuleWithFailedLookupLocations'.

Type 'null' is not assignable to type 'Worker'.

Type 'CollectionCompilerMeta | undefined' is not assignable to type 'CollectionCompilerMeta'.
Type 'undefined' is not assignable to type 'CollectionCompilerMeta'.

Type 'null' is not assignable to type 'ComponentCompilerStaticEvent'.

Type 'null' is not assignable to type 'PropertyAssignment'.

Type 'boolean | null' is not assignable to type 'boolean'.
Type 'null' is not assignable to type 'boolean'.

Type 'undefined' is not assignable to type 'ComponentCompilerVirtualProperty'.

Type '{ name: string; method: string; bubbles: boolean; cancelable: boolean; composed: boolean; docs: CompilerJsDoc; complexType: ComponentCompilerEventComplexType; internal: boolean | undefined; }[]' is not assignable to type 'ComponentCompilerEvent[]'.
Type '{ name: string; method: string; bubbles: boolean; cancelable: boolean; composed: boolean; docs: d.CompilerJsDoc; complexType: d.ComponentCompilerEventComplexType; internal: boolean | undefined; }' is not assignable to type 'ComponentCompilerEvent'.
Types of property 'internal' are incompatible.
Type 'boolean | undefined' is not assignable to type 'boolean'.

Type '{ name: string; docs: CompilerJsDoc; complexType: ComponentCompilerMethodComplexType; internal: boolean | undefined; }[]' is not assignable to type 'ComponentCompilerMethod[]'.
Type '{ name: string; docs: d.CompilerJsDoc; complexType: d.ComponentCompilerMethodComplexType; internal: boolean | undefined; }' is not assignable to type 'ComponentCompilerMethod'.
Types of property 'internal' are incompatible.
Type 'boolean | undefined' is not assignable to type 'boolean'.

Type '{ name: string; type: ComponentCompilerPropertyType; attribute: string | undefined; reflect: boolean; mutable: boolean; required: boolean; optional: boolean; defaultValue: string | undefined; complexType: ComponentCompilerPropertyComplexType; docs: CompilerJsDoc; internal: boolean | undefined; }[]' is not assignable to type 'ComponentCompilerProperty[]'.
Type '{ name: string; type: d.ComponentCompilerPropertyType; attribute: string | undefined; reflect: boolean; mutable: boolean; required: boolean; optional: boolean; defaultValue: string | undefined; complexType: d.ComponentCompilerPropertyComplexType; docs: d.CompilerJsDoc; internal: boolean | undefined; }' is not assignable to type 'ComponentCompilerProperty'.
Types of property 'internal' are incompatible.
Type 'boolean | undefined' is not assignable to type 'boolean'.

Type 'null' is not assignable to type 'ImportData'.

Type 'undefined' is not assignable to type '"queryparams" | null'.

Type 'null' is not assignable to type 'WeakSet'.

Type 'null' is not assignable to type 'Module'.

Type 'Module | undefined' is not assignable to type 'Module'.
Type 'undefined' is not assignable to type 'Module'.

Type 'undefined' is not assignable to type 'CompilerJsDoc'.

Type '{ [x: string]: d.TypesMemberNameData[] | undefined; }' is not assignable to type 'TypesImportData'.
'string' index signatures are incompatible.
Type 'TypesMemberNameData[] | undefined' is not assignable to type 'TypesMemberNameData[]'.
Type 'undefined' is not assignable to type 'TypesMemberNameData[]'.

Type 'string | undefined' is not assignable to type 'string | null'.

Type '((data: { file: string; line: number; column: number; }) => void) | null' is not assignable to type 'OpenInEditorCallback | undefined'.
Type 'null' is not assignable to type 'OpenInEditorCallback | undefined'.

Type 'null' is not assignable to type 'WebSocket'.

Type 'null' is not assignable to type 'BuildOnEventRemove'.

Type 'null' is not assignable to type '() => void'.

Type 'null' is not assignable to type '(msg: DevServerMessage) => void'.

Type 'DevServerConfig | undefined' is not assignable to type 'DevServerConfig'.
Type 'undefined' is not assignable to type 'DevServerConfig'.

Type 'null' is not assignable to type '{ open(openId: string): Promise; }'.

Type 'string | null' is not assignable to type 'string | undefined'.

Type 'null' is not assignable to type 'Promise<DevServerEditor[]>'.

Type 'null' is not assignable to type '(req: IncomingMessage, res: ServerResponse, next: () => void) => void'.

Type 'null' is not assignable to type 'URL'.

Type 'null' is not assignable to type 'URLSearchParams'.

Type 'PageReloadStrategy | undefined' is not assignable to type 'PageReloadStrategy'.
Type 'undefined' is not assignable to type 'PageReloadStrategy'.

Type 'null' is not assignable to type 'Server'.

Type 'null' is not assignable to type 'DevWebSocket'.

Type 'null' is not assignable to type 'DevServerContext'.

Type 'DevWebSocket | null' is not assignable to type 'DevWebSocket'.
Type 'null' is not assignable to type 'DevWebSocket'.

Type 'null' is not assignable to type 'ChildProcess'.

Type 'null' is not assignable to type 'HydrateApp'.

Type 'null' is not assignable to type 'ComponentConstructor'.

Type '(this: HostElement) => Promise | undefined' is not assignable to type '() => Promise'.
Type 'Promise | undefined' is not assignable to type 'Promise'.
Type 'undefined' is not assignable to type 'Promise'.

Type 'null' is not assignable to type 'Window & typeof globalThis'.
Type 'null' is not assignable to type 'Window'.

Type 'null' is not assignable to type 'Window & typeof globalThis'.

Type 'null' is not assignable to type 'MockCSSStyleSheet'.

Type 'null' is not assignable to type 'string | boolean'.

Type 'null' is not assignable to type 'Location'.

Type 'null' is not assignable to type 'MockElement'.

Type 'null' is not assignable to type 'SVGSVGElement'.

Type 'null' is not assignable to type 'SVGElement'.

Type 'null' is not assignable to type 'EventTarget'.

Type 'null' is not assignable to type 'MockEventListener[]'.

Type 'null' is not assignable to type 'MockDocument'.

Type '{ name: string; value: string; namespace: string | null; prefix: null; }[]' is not assignable to type 'Attribute[]'.
Type '{ name: string; value: string; namespace: string | null; prefix: null; }' is not assignable to type 'Attribute'.
Types of property 'namespace' are incompatible.
Type 'string | null' is not assignable to type 'string | undefined'.

Type '(element: MockElement) => string | null' is not assignable to type '(element: unknown) => string'.
Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Type 'ParentNode | null' is not assignable to type 'Node'.
Type 'null' is not assignable to type 'Node'.

Type 'null' is not assignable to type 'Document'.

Type 'string | null | undefined' is not assignable to type 'string | undefined'.

Type 'never[] | null' is not assignable to type 'RenderNode[]'.
Type 'null' is not assignable to type 'RenderNode[]'.

Type 'null' is not assignable to type 'VNode[]'.

Type 'null' is not assignable to type 'string | number | undefined'.

Type 'null' is not assignable to type 'string | number | Function'.

Type 'RenderNode | null' is not assignable to type 'RenderNode'.
Type 'null' is not assignable to type 'RenderNode'.

Type 'HTMLElement | null' is not assignable to type 'EventTarget'.
Type 'null' is not assignable to type 'EventTarget'.

Type 'string | null | undefined' is not assignable to type 'string | undefined'.
Type 'null' is not assignable to type 'string | undefined'.

Type 'null' is not assignable to type 'Set | undefined'.

Type 'null' is not assignable to type '[string, any][] | undefined'.

Type 'VNode[] | undefined' is not assignable to type 'VNode[]'.
Type 'undefined' is not assignable to type 'VNode[]'.

Type '(props: {}, children: VNode[], utils: FunctionalUtilities) => null' is not assignable to type 'FunctionalComponent<{}>'.
Type 'null' is not assignable to type 'VNode | VNode[]'.

Type '() => null' is not assignable to type 'FunctionalComponent<{}>'.
Type 'null' is not assignable to type 'VNode | VNode[]'.

Type 'null' is not assignable to type 'VNode'.

Type 'undefined' is not assignable to type 'VNode'.

Type 'RenderNode | undefined' is not assignable to type 'RenderNode'.
Type 'undefined' is not assignable to type 'RenderNode'.

Type 'RelocateNodeData | undefined' is not assignable to type 'RelocateNodeData'.
Type 'undefined' is not assignable to type 'RelocateNodeData'.

Type 'ChildNode | null' is not assignable to type 'Node'.
Type 'null' is not assignable to type 'Node'.

Type 'null' is not assignable to type 'ScreenshotBuild'.

Type 'null' is not assignable to type 'ScreenshotCache'.

Type 'null' is not assignable to type 'Buffer'.

Type 'null' is not assignable to type 'Screenshot'.

Type '(() => void) | undefined' is not assignable to type '() => any'.
Type 'undefined' is not assignable to type '() => any'.

Type '() => null' is not assignable to type '(opts: { rootDir: string; moduleId: string; path: string; }) => string'.
Type 'null' is not assignable to type 'string'.

Type '() => null' is not assignable to type '(opts: { moduleId: string; path?: string | undefined; version?: string | undefined; }) => string'.
Type 'null' is not assignable to type 'string'.

Type '() => string | undefined' is not assignable to type '() => string'.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.

Type 'number | null' is not assignable to type 'number'.
Type 'null' is not assignable to type 'number'.

Type 'any[] | undefined' is not assignable to type 'any[]'.
Type 'undefined' is not assignable to type 'any[]'.

Type 'null' is not assignable to type 'Promise'.

Type 'CompilerSystem | null' is not assignable to type 'CompilerSystem | undefined'.
Type 'null' is not assignable to type 'CompilerSystem | undefined'.

Type 'null' is not assignable to type 'ConfigBundle[] | undefined'.

Type 'null' is not assignable to type 'TestingConfig | undefined'.

Type 'null' is not assignable to type 'Cache'.

Type 'null' is not assignable to type '{ access: (filePath: string) => Promise; accessSync: (filePath: string) => boolean; cancelDeleteDirectoriesFromDisk: (dirPaths: string[]) => void; cancelDeleteFilesFromDisk: (filePaths: string[]) => void; ... 17 more ...; writeFiles: (files: { ...; } | Map<...>, opts?: FsWriteOptions | undefined) => Promise...'.

Type 'HostRef | undefined' is not assignable to type 'HostRef'.
Type 'undefined' is not assignable to type 'HostRef'.

Type 'Function | undefined' is not assignable to type 'Function'.
Type 'undefined' is not assignable to type 'Function'.

Type 'RafCallback | undefined' is not assignable to type 'Function'.
Type 'undefined' is not assignable to type 'Function'.

Type 'QueuedLoadModule | undefined' is not assignable to type 'QueuedLoadModule'.
Type 'undefined' is not assignable to type 'QueuedLoadModule'.

Type 'null' is not assignable to type 'ElementHandle'.

Type 'null' is not assignable to type 'E2EPageInternal'.

Type 'ElementHandle | null' is not assignable to type 'ElementHandle'.
Type 'null' is not assignable to type 'ElementHandle'.

Type 'null' is not assignable to type 'Promise<JSHandle>'.

Type '(a?: any, b?: any) => Promise<ScreenshotDiff | undefined>' is not assignable to type '{ (): Promise; (description: string): Promise; (opts: ScreenshotOptions): Promise<...>; (description: string, opts: ScreenshotOptions): Promise<...>; }'.
Type 'Promise<ScreenshotDiff | undefined>' is not assignable to type 'Promise'.
Type 'ScreenshotDiff | undefined' is not assignable to type 'ScreenshotDiff'.
Type 'undefined' is not assignable to type 'ScreenshotDiff'.

Type 'null' is not assignable to type 'Function | undefined'.

Type 'null' is not assignable to type 'CompilerWatcher'.

Type 'null' is not assignable to type 'Promise'.

Type 'Browser | null' is not assignable to type 'Browser'.
Type 'null' is not assignable to type 'Browser'.

Type 'null' is not assignable to type 'ValidatedConfig'.

Type 'null' is not assignable to type 'Browser'.

Type 'null' is not assignable to type 'SourceMap'.

Type 'null' is not assignable to type 'PackageJsonData'.

Type 'null' is not assignable to type '{ [moduleId: string]: string; } | undefined'.
TS2531 203
Error messages Object is possibly 'null'.
TS2454 46
Error messages Variable 'pkgJsonData' is used before being assigned.

Variable 'minifyOpts' is used before being assigned.

Variable 'workerCtrl' is used before being assigned.

Variable 'timespan' is used before being assigned.

Variable 'content' is used before being assigned.

Variable 'compilerExe' is used before being assigned.

Variable 'outputText' is used before being assigned.

Variable 'importResolvedFile' is used before being assigned.

Variable 'win' is used before being assigned.

Variable 'attrName' is used before being assigned.

Variable 'oldValue' is used before being assigned.

Variable 'newValue' is used before being assigned.

Variable 'hostId' is used before being assigned.

Variable 'promise' is used before being assigned.

Variable 'textContent' is used before being assigned.

Variable 'resolve' is used before being assigned.

Variable 'opts' is used before being assigned.
TS2722 42
Error messages Cannot invoke an object which is possibly 'undefined'.
TS2352 20
Error messages Conversion of type 'null' to type 'string' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.

Conversion of type 'null' to type 'CompilerSystem' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.

Conversion of type 'null' to type 'string[]' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.

Conversion of type '{ cmps: never[]; }' to type 'Module' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
Type '{ cmps: never[]; }' is missing the following properties from type 'Module': coreRuntimeApis, collectionName, dtsFilePath, excludeFromCollection, and 27 more.

Conversion of type 'null' to type 'ScreenshotCache' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
TS2769 13
Error messages No overload matches this call.
Overload 1 of 2, '(o: {}): string[]', gave the following error.
Argument of type 'BuildResultsComponentGraph | undefined' is not assignable to parameter of type '{}'.
Type 'undefined' is not assignable to type '{}'.
Overload 2 of 2, '(o: object): string[]', gave the following error.
Argument of type 'BuildResultsComponentGraph | undefined' is not assignable to parameter of type 'object'.
Type 'undefined' is not assignable to type 'object'.

No overload matches this call.
Overload 1 of 2, '(type: keyof DocumentEventMap, listener: (this: Document, ev: PointerEvent | MouseEvent | UIEvent | Event | ErrorEvent | ... 13 more ... | WheelEvent) => any, options?: boolean | ... 1 more ... | undefined): void', gave the following error.
Argument of type '"e"' is not assignable to parameter of type 'keyof DocumentEventMap'.
Overload 2 of 2, '(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | undefined): void', gave the following error.
Argument of type 'null' is not assignable to parameter of type 'EventListenerOrEventListenerObject'.

No overload matches this call.
Overload 1 of 4, '(object: {}, method: never): SpyInstance<never, never>', gave the following error.
Argument of type 'CompilerWorkerContext | undefined' is not assignable to parameter of type '{}'.
Type 'undefined' is not assignable to type '{}'.
Overload 2 of 4, '(object: {}, method: never): SpyInstance<never, never>', gave the following error.
Argument of type 'CompilerWorkerContext | undefined' is not assignable to parameter of type '{}'.
Type 'undefined' is not assignable to type '{}'.

No overload matches this call.
The last overload gave the following error.
Argument of type 'string | null' is not assignable to parameter of type '(substring: string, ...args: any[]) => string'.
Type 'null' is not assignable to type '(substring: string, ...args: any[]) => string'.

No overload matches this call.
The last overload gave the following error.
Argument of type 'string | null' is not assignable to parameter of type 'string | number | boolean | PseudoBigInt'.
Type 'null' is not assignable to type 'string | number | boolean | PseudoBigInt'.

No overload matches this call.
Overload 1 of 2, '(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram | undefined, reportDiagnostic?: DiagnosticReporter | undefined, reportWatchStatus?: WatchStatusReporter | undefined, watchOptionsToExtend?: WatchOptions | undefined, extraFileExtensions?: readonly FileExtensionInfo[] | undefined): WatchCompilerHostOfConfigFile<...>', gave the following error.
Argument of type 'string | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.
Overload 2 of 2, '(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram | undefined, reportDiagnostic?: DiagnosticReporter | undefined, reportWatchStatus?: WatchStatusReporter | undefined, projectReferences?: readonly ProjectReference[] | undefined, watchOptions?: WatchOptions | undefined): WatchCompilerHostOfFilesAndCompilerOptions<...>', gave the following error.
Argument of type 'string | undefined' is not assignable to parameter of type 'string[]'.
Type 'undefined' is not assignable to type 'string[]'.

No overload matches this call.
Overload 1 of 2, '(timeoutId: Timeout): void', gave the following error.
Argument of type 'Timeout | null' is not assignable to parameter of type 'Timeout'.
Type 'null' is not assignable to type 'Timeout'.
Overload 2 of 2, '(id?: number | undefined): void', gave the following error.
Argument of type 'Timeout | null' is not assignable to parameter of type 'number | undefined'.
Type 'null' is not assignable to type 'number | undefined'.

No overload matches this call.
Overload 1 of 2, '(timeoutId: Timeout): void', gave the following error.
Argument of type 'Timeout | null' is not assignable to parameter of type 'Timeout'.
Type 'null' is not assignable to type 'Timeout'.
Overload 2 of 2, '(id?: number | undefined): void', gave the following error.
Argument of type 'Timeout | null' is not assignable to parameter of type 'number | undefined'.

No overload matches this call.
Overload 1 of 3, '(p: string, encoding: "utf8"): Promise', gave the following error.
Argument of type 'string | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.
Overload 2 of 3, '(p: string, encoding: "binary"): Promise', gave the following error.
Argument of type 'string | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.

No overload matches this call.
Overload 1 of 2, '(values: [] | readonly unknown[]): Promise<unknown[] | []>', gave the following error.
Argument of type 'Promise[] | undefined' is not assignable to parameter of type '[] | readonly unknown[]'.
Type 'undefined' is not assignable to type '[] | readonly unknown[]'.
Overload 2 of 2, '(values: Iterable<void | PromiseLike>): Promise<void[]>', gave the following error.
Argument of type 'Promise[] | undefined' is not assignable to parameter of type 'Iterable<void | PromiseLike>'.
Type 'undefined' is not assignable to type 'Iterable<void | PromiseLike>'.
TS2790 10
Error messages The operand of a 'delete' operator must be optional.
TS2538 7
Error messages Type 'undefined' cannot be used as an index type.

Type 'null' cannot be used as an index type.
TS2416 4
Error messages Property 'get' in type 'Cache' is not assignable to the same property in base type 'Cache'.
Type '(key: string) => Promise<string | null>' is not assignable to type '(key: string) => Promise'.
Type 'Promise<string | null>' is not assignable to type 'Promise'.
Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Property 'getMemoryStats' in type 'Cache' is not assignable to the same property in base type 'Cache'.
Type '() => string | null' is not assignable to type '() => string'.
Type 'string | null' is not assignable to type 'string'.
Type 'null' is not assignable to type 'string'.

Property 'find' in type 'E2EElement' is not assignable to the same property in base type 'E2EElementInternal'.
Type '(selector: string) => Promise<E2EElement | null>' is not assignable to type '(selector: FindSelector) => Promise'.
Type 'Promise<E2EElement | null>' is not assignable to type 'Promise'.
Type 'E2EElement | null' is not assignable to type 'E2EElement'.
Type 'null' is not assignable to type 'E2EElement'.

Property 'findAll' in type 'E2EElement' is not assignable to the same property in base type 'E2EElementInternal'.
Type '(selector: string) => Promise<E2EElement[]>' is not assignable to type '(selector: FindSelector) => Promise<E2EElement[]>'.
Type 'Promise<import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-element").E2EElement[]>' is not assignable to type 'Promise<import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-declarations").E2EElement[]>'.
Type 'import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-element").E2EElement[]' is not assignable to type 'import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-declarations").E2EElement[]'.
Type 'import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-element").E2EElement' is not assignable to type 'import("/home/runner/work/stencil/stencil/src/testing/puppeteer/puppeteer-declarations").E2EElement'.
The types returned by 'find(...)' are incompatible between these types.
Type 'Promise<E2EElement | null>' is not assignable to type 'Promise'.
TS2533 3
Error messages Object is possibly 'null' or 'undefined'.
TS2493 3
Error messages Tuple type '[]' of length '0' has no element at index '0'.
TS2488 2
Error messages Type 'Diagnostic[] | undefined' must have a 'Symbol.iterator' method that returns an iterator.

Type 'string[] | undefined' must have a 'Symbol.iterator' method that returns an iterator.
TS2774 2
Error messages This condition will always return true since this function is always defined. Did you mean to call it instead?
TS2684 1
Error messages The 'this' context of type 'ResolveIdHook | undefined' is not assignable to method's 'this' of type 'Function'.
Type 'undefined' is not assignable to type 'Function'.
TS2464 1
Error messages A computed property name must be of type 'string', 'number', 'symbol', or 'any'.
TS2430 1
Error messages Interface 'SerializeOpts' incorrectly extends interface 'SerializeCssOptions'.
Types of property 'usedSelectors' are incompatible.
Type 'UsedSelectors | null' is not assignable to type 'UsedSelectors | undefined'.
Type 'null' is not assignable to type 'UsedSelectors | undefined'.
TS2339 1
Error messages Property 'kind' does not exist on type 'never'.

Unused exports report

There are 9 unused exports on this PR. That's the same number of errors on main, so at least we're not creating new ones!

Unused exports
File Line Identifier
src/screenshot/screenshot-fs.ts 18 readScreenshotData
src/testing/testing-utils.ts 185 withSilentWarn
src/compiler/app-core/app-data.ts 3 BUILD
src/compiler/app-core/app-data.ts 88 Env
src/compiler/app-core/app-data.ts 90 NAMESPACE
src/compiler/fs-watch/fs-watch-rebuild.ts 110 updateCacheFromRebuild
src/testing/platform/testing-platform.ts 28 cssVarShim
src/testing/puppeteer/puppeteer-declarations.ts 513 WaitForEventOptions
src/client/polyfills/css-shim/utils.ts 1 GLOBAL_SCOPE

@johnjenkins johnjenkins requested a review from a team as a code owner May 13, 2024 16:20
@christian-bromann
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Unfortunately at this point we can only close the PR due to amount of conflicts that have been added since you raised the PR. I apologies that we've never been able to circle back to this. We still agree with you that the compiler is essential to Stencil and we have to continue making sure we properly test is from end to end. That said, since we have had some rotations in the Stencil team, we have to re-asses this effort from scratch. We would love to keep you in the loop once work around this area is started.

Thanks again for supporting Stencil!

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@christian-bromann christian-bromann Awaiting requested review from christian-bromann christian-bromann is a code owner automatically assigned from ionic-team/stencil

@rwaskiewicz rwaskiewicz Awaiting requested review from rwaskiewicz rwaskiewicz is a code owner automatically assigned from ionic-team/stencil

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Resolution: Refine This PR is marked for Jira refinement. We're not working on it - we're talking it through.
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@johnjenkins @rwaskiewicz @christian-bromann @splitinfinities