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no-undefined-types and TypeScript #1098

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merged 2 commits into from May 28, 2023
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@brettz9 brettz9 commented May 26, 2023

BREAKING CHANGE:

This should only impact users of typescript configs. TS should itself handle
checking for undefined types, so the (imperfect) rule has been disabled for
such users.

…us#888

BREAKING CHANGE:

This should only impact users of typescript configs. TS should itself handle
checking for undefined types, so the (imperfect) rule has been disabled for
such users.
@brettz9 brettz9 merged commit 6042b77 into gajus:main May 28, 2023
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🎉 This PR is included in version 45.0.0 🎉

The release is available on:

Your semantic-release bot 📦🚀

@brettz9 brettz9 deleted the ts-no-undefined-types branch May 28, 2023 15:33
mbland added a commit to mbland/rollup-plugin-handlebars-precompiler that referenced this pull request Jan 10, 2024
The code is still JavaScript, but now we get strict type checking in
Visual Studio Code and in continuous integration via `tsc` in `pnpm
typecheck`.

The docs generated by 'jsdoc' are a little funky, and we don't get as
much documentation in Visual Studio Code as I expected. I believe I can
fix these issues at some point with this foundation in place.

The actual changes include:

- Added @types/{chai,node}, jsdoc, and typescript as devDependencies.

- Added JSDoc-based @typedefs, including the standalone lib/types.js
  based on: "Stack Overflow: How to 'import' a typedef from one file to
  another in JSDoc using Node.js?"

  - https://stackoverflow.com/a/76872194

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor-error"]
  > }
  > ```
  >
  > - https://github.com/gajus/eslint-plugin-jsdoc#eslintrc

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- At the same time, extending "recommended-typescript-flavor-error"
  required adding the `// eslint-disable-next-line no-unused-vars`
  directive before each set of imports from lib/types.js.

- Added test/vitest.d.ts so TypeScript could find the custom toStartWith
  and toEndWith expect extension matchers.

- Added `pnpm typecheck && pnpm jsdoc` to `pnpm test:ci`.
mbland added a commit to mbland/tomcat-servlet-testing-example that referenced this pull request Jan 13, 2024
Adds Typescript to devDependencies and a jsconfig.json files to ensure
Visual Studio Code performs more thorough type checking.

Description largely copied from:

- mbland/test-page-opener#22
  mbland/test-page-opener@a63f274
- mbland/test-page-opener#23
  mbland/test-page-opener@01a79f6
- mbland/jsdoc-cli-wrapper#20
  mbland/jsdoc-cli-wrapper@fafcd21
- mbland/rollup-plugin-handlebars-precompiler#7
  mbland/rollup-plugin-handlebars-precompiler@eb5b9a8
- mbland/rollup-plugin-handlebars-precompiler#8
  mbland/rollup-plugin-handlebars-precompiler@8b36b2a

The code is still JavaScript, but now we get strict type checking in
Visual Studio Code and in continuous integration via `tsc` in `pnpm
typecheck`.

The docs generated by 'jsdoc' are a little funky, and we don't get as
much documentation in Visual Studio Code as I expected. I believe I can
fix these issues at some point with this foundation in place.

The actual changes include:

- Added @types/chai, jsdoc, and typescript as devDependencies.

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- Added `settings.jsdoc.preferredTypes.Object = "object"` to .eslintrc
  to enable "Object.<..., ...>" syntax in a JSDoc `@typedef`. Got rid of
  some extra whitespaces in .eslintrc, too.
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/rules/check-types.md#why-not-capital-case-everything
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/settings.md#settings-to-configure-check-types-and-no-undefined-types

- Added '.js' extension to all internal imports and added JSDoc comments
  everywhere reqired by `pnpm typecheck`.

- Added 'jsdoc-plugin-typescript' to the build to handle the TypeScript
  `import().Type` directives. This ended up pulling in the 'es-abstract'
  module, which blew up the pnpm-lock.yaml file. If I get an itch, I'll
  implement my own plugin one day and replace it.

- Updated `pnpm test-ci` to incorporate `pnpm jsdoc` and `pnpm
  typecheck`. Added 'jsdoc' to devDependencies to enable this.

- Added `null` checks everywhere reqired by `pnpm typecheck`. Added
  tests to cover all the `null` cases.

- Added globals.d.ts and a `/* global STRCALC_BACKEND */` ESLint comment
  to calculators.js to properly type check `globalThis.STRCALC_BACKEND`.
  Ironically, this required just referencing it as `STRCALC_BACKEND`
  without `globalThis`.

- Added a temporary components/template.d.ts containing the Handlebars
  Template() type declaration. Once I properly export those types from
  rollup-plugin-handlebars-precompiler, I'll remove it. (That plugin
  currently contains lib/template.d.ts, not types/template.d.ts.)

- Added a test for the `#missing app element` case in main.js by adding
  a new test/main-missing-app-div.test.js. I need to port it to
  mbland/test-page-opener to solve the coverage problem encountered in:

  - mbland/test-page-opener#23
    mbland/test-page-opener@01a79f6

  > - Added a new missing.html and "JsdomPageOpener > doesn't throw if
  >   missing app div" test case to cover new null check in
  >   test-modules/main.js.
  >
  >   This did, however, throw off Istanbul coverage, but not V8
  >   coverage. Running just the "doesn't throw" test case shows 0%
  >   coverage of main.js, even though the test clearly passes. My
  >   suspicion is that Istanbul can't associate the
  >   `./main.js?version=missing` import path from missing.html with the
  >   test-modules/main.js file.
  >
  >   So now `pnpm test:ci:jsdom` will use the V8 provider, and `pnpm
  >   test:ci:browser`, which doesn't use missing.html, will continue to
  >   use Istanbul. Each task outputs its own separate .lcov file which
  >   then gets merged into Coveralls.

- Updated `setupFetchStub()` to detect the type of the `body` argument
  and call `JSON.stringify()` itself if it's an `object`. This
  eliminated the need for most callers to call `JSON.stringify()`.

- Updated `StringCalculatorPage` with typing information and made it so
  that an empty object will stand in for `null` elements. This is
  playing loose with typing a bit, as any `null`s will cause errors
  showing unknown property access. But that seemed better than
  burdening all callers to do their own `null` checks or workarounds.

Of special note:

- Added the `instantiate()` parameter to Calculator.init() to inject a
  Handlebars Template() function. This enabled testing that a missing
  `#numbers` element was logged by Calculator.init().

  Tests for this and Calculator.#submitRequest() set up a console.error
  spy along with a callback for Vitest's vi.waitFor().

  I need to write a document and/or blog post about this as part of the
  Handlebars Component Pattern. (I just came up with that name while
  writing it.)
mbland added a commit to mbland/tomcat-servlet-testing-example that referenced this pull request Jan 13, 2024
Adds Typescript to devDependencies and a jsconfig.json files to ensure
Visual Studio Code performs more thorough type checking.

Description largely copied from:

- mbland/test-page-opener#22
  mbland/test-page-opener@a63f274
- mbland/test-page-opener#23
  mbland/test-page-opener@01a79f6
- mbland/jsdoc-cli-wrapper#20
  mbland/jsdoc-cli-wrapper@fafcd21
- mbland/rollup-plugin-handlebars-precompiler#7
  mbland/rollup-plugin-handlebars-precompiler@eb5b9a8
- mbland/rollup-plugin-handlebars-precompiler#8
  mbland/rollup-plugin-handlebars-precompiler@8b36b2a

The code is still JavaScript, but now we get strict type checking in
Visual Studio Code and in continuous integration via `tsc` in `pnpm
typecheck`.

The docs generated by 'jsdoc' are a little funky, and we don't get as
much documentation in Visual Studio Code as I expected. I believe I can
fix these issues at some point with this foundation in place.

The actual changes include:

- Added @types/chai, jsdoc, and typescript as devDependencies.

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- Added `settings.jsdoc.preferredTypes.Object = "object"` to .eslintrc
  to enable "Object.<..., ...>" syntax in a JSDoc `@typedef`. Got rid of
  some extra whitespaces in .eslintrc, too.
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/rules/check-types.md#why-not-capital-case-everything
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/settings.md#settings-to-configure-check-types-and-no-undefined-types

- Added '.js' extension to all internal imports and added JSDoc comments
  everywhere reqired by `pnpm typecheck`.

- Added 'jsdoc-plugin-typescript' to the build to handle the TypeScript
  `import().Type` directives. This ended up pulling in the 'es-abstract'
  module, which blew up the pnpm-lock.yaml file. If I get an itch, I'll
  implement my own plugin one day and replace it.

- Updated `pnpm test-ci` to incorporate `pnpm jsdoc` and `pnpm
  typecheck`. Added 'jsdoc' to devDependencies to enable this.

- Added `null` checks everywhere reqired by `pnpm typecheck`. Added
  tests to cover all the `null` cases.

- Added globals.d.ts and a `/* global STRCALC_BACKEND */` ESLint comment
  to calculators.js to properly type check `globalThis.STRCALC_BACKEND`.
  Ironically, this required just referencing it as `STRCALC_BACKEND`
  without `globalThis`.

- Added a temporary components/template.d.ts containing the Handlebars
  Template() type declaration. Once I properly export those types from
  rollup-plugin-handlebars-precompiler, I'll remove it. (That plugin
  currently contains lib/template.d.ts, not types/template.d.ts.)

- Added a test for the `#missing app element` case in main.js by adding
  a new test/main-missing-app-div.test.js. I need to port it to
  mbland/test-page-opener to solve the coverage problem encountered in:

  - mbland/test-page-opener#23
    mbland/test-page-opener@01a79f6

  > - Added a new missing.html and "JsdomPageOpener > doesn't throw if
  >   missing app div" test case to cover new null check in
  >   test-modules/main.js.
  >
  >   This did, however, throw off Istanbul coverage, but not V8
  >   coverage. Running just the "doesn't throw" test case shows 0%
  >   coverage of main.js, even though the test clearly passes. My
  >   suspicion is that Istanbul can't associate the
  >   `./main.js?version=missing` import path from missing.html with the
  >   test-modules/main.js file.
  >
  >   So now `pnpm test:ci:jsdom` will use the V8 provider, and `pnpm
  >   test:ci:browser`, which doesn't use missing.html, will continue to
  >   use Istanbul. Each task outputs its own separate .lcov file which
  >   then gets merged into Coveralls.

- Updated `setupFetchStub()` to detect the type of the `body` argument
  and call `JSON.stringify()` itself if it's an `object`. This
  eliminated the need for most callers to call `JSON.stringify()`.

- Updated `StringCalculatorPage` with typing information and made it so
  that an empty object will stand in for `null` elements. This is
  playing loose with typing a bit, as any `null`s will cause errors
  showing unknown property access. But that seemed better than
  burdening all callers to do their own `null` checks or workarounds.

Of special note:

- Added the `instantiate()` parameter to Calculator.init() to inject a
  Handlebars Template() function. This enabled testing that a missing
  `#numbers` element was logged by Calculator.init().

  Tests for this and Calculator.#submitRequest() set up a console.error
  spy along with a callback for Vitest's vi.waitFor().

  I need to write a document and/or blog post about this as part of the
  Handlebars Component Pattern. (I just came up with that name while
  writing it.)
mbland added a commit to mbland/tomcat-servlet-testing-example that referenced this pull request Jan 13, 2024
Adds Typescript to devDependencies and a jsconfig.json files to ensure
Visual Studio Code performs more thorough type checking.

Description largely copied from:

- mbland/test-page-opener#22
  mbland/test-page-opener@a63f274
- mbland/test-page-opener#23
  mbland/test-page-opener@01a79f6
- mbland/jsdoc-cli-wrapper#20
  mbland/jsdoc-cli-wrapper@fafcd21
- mbland/rollup-plugin-handlebars-precompiler#7
  mbland/rollup-plugin-handlebars-precompiler@eb5b9a8
- mbland/rollup-plugin-handlebars-precompiler#8
  mbland/rollup-plugin-handlebars-precompiler@8b36b2a

The code is still JavaScript, but now we get strict type checking in
Visual Studio Code and in continuous integration via `tsc` in `pnpm
typecheck`.

The docs generated by 'jsdoc' are a little funky, and we don't get as
much documentation in Visual Studio Code as I expected. I believe I can
fix these issues at some point with this foundation in place.

The actual changes include:

- Added @types/chai, jsdoc, and typescript as devDependencies.

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- Added `settings.jsdoc.preferredTypes.Object = "object"` to .eslintrc
  to enable "Object.<..., ...>" syntax in a JSDoc `@typedef`. Got rid of
  some extra whitespaces in .eslintrc, too.
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/rules/check-types.md#why-not-capital-case-everything
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/settings.md#settings-to-configure-check-types-and-no-undefined-types

- Added '.js' extension to all internal imports and added JSDoc comments
  everywhere reqired by `pnpm typecheck`.

- Added 'jsdoc-plugin-typescript' to the build to handle the TypeScript
  `import().Type` directives. This ended up pulling in the 'es-abstract'
  module, which blew up the pnpm-lock.yaml file. If I get an itch, I'll
  implement my own plugin one day and replace it.

- Updated `pnpm test-ci` to incorporate `pnpm jsdoc` and `pnpm
  typecheck`. Added 'jsdoc' to devDependencies to enable this.

- Added `null` checks everywhere reqired by `pnpm typecheck`. Added
  tests to cover all the `null` cases.

- Added globals.d.ts and a `/* global STRCALC_BACKEND */` ESLint comment
  to calculators.js to properly type check `globalThis.STRCALC_BACKEND`.
  Ironically, this required just referencing it as `STRCALC_BACKEND`
  without `globalThis`.

- Added a temporary components/template.d.ts containing the Handlebars
  Template() type declaration. Once I properly export those types from
  rollup-plugin-handlebars-precompiler, I'll remove it. (That plugin
  currently contains lib/template.d.ts, not types/template.d.ts.)

- Added a test for the `#missing app element` case in main.js by adding
  a new test/main-missing-app-div.test.js. I need to port it to
  mbland/test-page-opener to solve the coverage problem encountered in:

  - mbland/test-page-opener#23
    mbland/test-page-opener@01a79f6

  > - Added a new missing.html and "JsdomPageOpener > doesn't throw if
  >   missing app div" test case to cover new null check in
  >   test-modules/main.js.
  >
  >   This did, however, throw off Istanbul coverage, but not V8
  >   coverage. Running just the "doesn't throw" test case shows 0%
  >   coverage of main.js, even though the test clearly passes. My
  >   suspicion is that Istanbul can't associate the
  >   `./main.js?version=missing` import path from missing.html with the
  >   test-modules/main.js file.
  >
  >   So now `pnpm test:ci:jsdom` will use the V8 provider, and `pnpm
  >   test:ci:browser`, which doesn't use missing.html, will continue to
  >   use Istanbul. Each task outputs its own separate .lcov file which
  >   then gets merged into Coveralls.

- Updated `setupFetchStub()` to detect the type of the `body` argument
  and call `JSON.stringify()` itself if it's an `object`. This
  eliminated the need for most callers to call `JSON.stringify()`.

- Updated `StringCalculatorPage` with typing information and made it so
  that an empty object will stand in for `null` elements. This is
  playing loose with typing a bit, as any `null`s will cause errors
  showing unknown property access. But that seemed better than
  burdening all callers to do their own `null` checks or workarounds.

Of special note:

- Added the `instantiate()` parameter to Calculator.init() to inject a
  Handlebars Template() function. This enabled testing that a missing
  `#numbers` element was logged by Calculator.init().

  Tests for this and Calculator.#submitRequest() set up a console.error
  spy along with a callback for Vitest's vi.waitFor().

  I need to write a document and/or blog post about this as part of the
  Handlebars Component Pattern. (I just came up with that name while
  writing it.)
mbland added a commit to mbland/tomcat-servlet-testing-example that referenced this pull request Jan 13, 2024
Adds Typescript to devDependencies and a jsconfig.json files to ensure
Visual Studio Code performs more thorough type checking.

Description largely copied from:

- mbland/test-page-opener#22
  mbland/test-page-opener@a63f274
- mbland/test-page-opener#23
  mbland/test-page-opener@01a79f6
- mbland/jsdoc-cli-wrapper#20
  mbland/jsdoc-cli-wrapper@fafcd21
- mbland/rollup-plugin-handlebars-precompiler#7
  mbland/rollup-plugin-handlebars-precompiler@eb5b9a8
- mbland/rollup-plugin-handlebars-precompiler#8
  mbland/rollup-plugin-handlebars-precompiler@8b36b2a

The code is still JavaScript, but now we get strict type checking in
Visual Studio Code and in continuous integration via `tsc` in `pnpm
typecheck`.

The docs generated by 'jsdoc' are a little funky, and we don't get as
much documentation in Visual Studio Code as I expected. I believe I can
fix these issues at some point with this foundation in place.

The actual changes include:

- Added @types/chai, jsdoc, and typescript as devDependencies.

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- Added `settings.jsdoc.preferredTypes.Object = "object"` to .eslintrc
  to enable "Object.<..., ...>" syntax in a JSDoc `@typedef`. Got rid of
  some extra whitespaces in .eslintrc, too.
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/rules/check-types.md#why-not-capital-case-everything
  - https://github.com/gajus/eslint-plugin-jsdoc/blob/b60cbb027b03b4f6d509933b0dca8681dbe47206/docs/settings.md#settings-to-configure-check-types-and-no-undefined-types

- Added '.js' extension to all internal imports and added JSDoc comments
  everywhere reqired by `pnpm typecheck`.

- Added 'jsdoc-plugin-typescript' to the build to handle the TypeScript
  `import().Type` directives. This ended up pulling in the 'es-abstract'
  module, which blew up the pnpm-lock.yaml file. If I get an itch, I'll
  implement my own plugin one day and replace it.

- Updated `pnpm test-ci` to incorporate `pnpm jsdoc` and `pnpm
  typecheck`. Added 'jsdoc' to devDependencies to enable this.

- Added `null` checks everywhere reqired by `pnpm typecheck`. Added
  tests to cover all the `null` cases.

- Added globals.d.ts and a `/* global STRCALC_BACKEND */` ESLint comment
  to calculators.js to properly type check `globalThis.STRCALC_BACKEND`.
  Ironically, this required just referencing it as `STRCALC_BACKEND`
  without `globalThis`.

- Added a temporary components/template.d.ts containing the Handlebars
  Template() type declaration. Once I properly export those types from
  rollup-plugin-handlebars-precompiler, I'll remove it. (That plugin
  currently contains lib/template.d.ts, not types/template.d.ts.)

- Added a test for the `#missing app element` case in main.js by adding
  a new test/main-missing-app-div.test.js. I need to port it to
  mbland/test-page-opener to solve the coverage problem encountered in:

  - mbland/test-page-opener#23
    mbland/test-page-opener@01a79f6

  > - Added a new missing.html and "JsdomPageOpener > doesn't throw if
  >   missing app div" test case to cover new null check in
  >   test-modules/main.js.
  >
  >   This did, however, throw off Istanbul coverage, but not V8
  >   coverage. Running just the "doesn't throw" test case shows 0%
  >   coverage of main.js, even though the test clearly passes. My
  >   suspicion is that Istanbul can't associate the
  >   `./main.js?version=missing` import path from missing.html with the
  >   test-modules/main.js file.
  >
  >   So now `pnpm test:ci:jsdom` will use the V8 provider, and `pnpm
  >   test:ci:browser`, which doesn't use missing.html, will continue to
  >   use Istanbul. Each task outputs its own separate .lcov file which
  >   then gets merged into Coveralls.

- Updated `setupFetchStub()` to detect the type of the `body` argument
  and call `JSON.stringify()` itself if it's an `object`. This
  eliminated the need for most callers to call `JSON.stringify()`.

- Updated `StringCalculatorPage` with typing information and made it so
  that an empty object will stand in for `null` elements. This is
  playing loose with typing a bit, as any `null`s will cause errors
  showing unknown property access. But that seemed better than
  burdening all callers to do their own `null` checks or workarounds.

Of special note:

- Added the `instantiate()` parameter to Calculator.init() to inject a
  Handlebars Template() function. This enabled testing that a missing
  `#numbers` element was logged by Calculator.init().

  Tests for this and Calculator.#submitRequest() set up a console.error
  spy along with a callback for Vitest's vi.waitFor().

  I need to write a document and/or blog post about this as part of the
  Handlebars Component Pattern. (I just came up with that name while
  writing it.)
mbland added a commit to mbland/test-page-opener that referenced this pull request Jan 16, 2024
Most of this message is copied from:

- mbland/jsdoc-cli-wrapper#21
  mbland/jsdoc-cli-wrapper@e0d287d
- mbland/rollup-plugin-handlebars-precompiler#7
  mbland/rollup-plugin-handlebars-precompiler@eb5b9a8
- mbland/rollup-plugin-handlebars-precompiler#8
  mbland/rollup-plugin-handlebars-precompiler@8b36b2a

After doing more research, it appears tsconfig.json is more broadly
supported by editors and IDEs than jsconfig.json. For example, IntelliJ
IDEA/WebStorm won't recognize it unless added to Settings > Editor >
File Types > TypeScript.

Related changes include:

- Fixed the problems with vitest.config.js and ci/vitest.config.js such
  that the `// @ts-nocheck` directive is no longer necessary. Used
  `...(configDefaults.coverage.exclude || [])` to avoid type errors due
  to configDefaults.coverage.exclude potentially being undefined.

- Moved a bunch of compiler options from the `pnpm typecheck` script
  into tsconfig.json.

- Added the `rimraf` npm to make sure `pnpm prepack` generates a new
  `types/` directory without stale content.

- Added @types/{jsdom,istanbul-lib-coverage} as production dependencies.

- Bumped vitest to 1.2.0.

- Set .eslintrc to disable the no-undefined-types rule by extending
  "plugin:jsdoc/recommended-typescript-flavor-error". This is because
  the Handlebars types in lib/parser.js weren't trivial to replicate,
  and TypeScript finds those types just fine. This was based on advice
  from:

  > ...the config plugin:jsdoc/recommended-typescript-error should
  > disable the jsdoc/no-undefined-types rule because TypeScript itself
  > is responsible for reporting errors about invalid JSDoc types.
  >
  > - gajus/eslint-plugin-jsdoc#888 (comment)

  And:

  > If you are not using TypeScript syntax (your source files are still
  > .js files) but you are using the TypeScript flavor within JSDoc
  > (i.e., the default "typescript" mode in eslint-plugin-jsdoc) and you
  > are perhaps using allowJs and checkJs options of TypeScript's
  > tsconfig.json), you may use:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor"]
  > }
  > ```
  >
  > ...or to report with failing errors instead of mere warnings:
  >
  > ```json
  > {
  >   "extends": ["plugin:jsdoc/recommended-typescript-flavor-error"]
  > }
  > ```
  >
  > - https://github.com/gajus/eslint-plugin-jsdoc#eslintrc

  More background:

  - https://github.com/gajus/eslint-plugin-jsdoc/blob/main/docs/rules/no-undefined-types.md
  - gajus/eslint-plugin-jsdoc#99
  - gajus/eslint-plugin-jsdoc#1098
  - jsdoc/jsdoc#1537

- At the same time, extending "recommended-typescript-flavor-error"
  required adding the `// eslint-disable-next-line no-unused-vars`
  directive before each set of imports from lib/types.js. (Or adding
  `// eslint-disable-line no-unused-vars` on the same line if possible.)

- Added 'jsdoc-plugin-typescript' to the build to handle the TypeScript
  `import().Type` directives. This ended up pulling in the 'es-abstract'
  module, which blew up the pnpm-lock.yaml file. If I get an itch, I'll
  implement my own plugin one day and replace it.

- Finally, it seems IntelliJ IDEA's JSDoc type checking is stronger than
  TypeScript and VSCode. Fixed a few JSDoc type parameters to eliminate
  warnings in IntelliJ as well.
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no-undefined-types: false positives for built-in interface types in typescript mode
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