refactor(deno): remove deno from codebase (#3067)

remove deno from the codebase. narrow environment variables
to only account for a Node-based environment

an adr is included in this commit to justify the removal of deno
from the codebase

.gitignore

@@ -20,7 +20,6 @@ coverage/
 
 /build/
 /scripts/build/
-!/scripts/build/deno-cache
 dist/
 
 # submodule packages

docs/adr/0010-deno-vendoring.md

@@ -4,7 +4,7 @@ Date: 2021-08-24
 
 ## Status
 
-accepted
+deprecated - see [0013-deno-removal.md](./0013-deno-removal.md)
 
 ## Context
 
@@ -66,4 +66,5 @@ experimental feature, we accept that risk.
 
 ## Links
 
+- Document that supersedes this one: [0013-deno-removal.md](./0013-deno-removal.md)
 - PR introducing this change: [fix(ci): vendor deno for builds #3020](https://github.com/ionic-team/stencil/pull/3020)

docs/adr/0013-deno-removal.md

@@ -0,0 +1,37 @@
+# 13. deno-removal
+
+Date: 2021.09.16
+
+## Status
+
+accepted
+
+## Context
+
+Deno support in Stencil has always been marked as 'experimental'. Throughout the feature's lifespan, the current team
+has run into some form of issue or another. For a concrete example of such an issue, see 
+[0010-deno-vendoring.md](./0010-deno-vendoring.md).
+
+The Stencil team revisited the capability and value associated with this functionality. The feature did not work in 
+the latest version of Stencil, and the team has not been able to get any positive signal that this functionality is 
+being used. 
+
+## Decision
+
+Deno shall be removed from the Stencil codebase. However, the `sys` interface shall remain.
+
+Deno shall be removed from the Stencil site as a downloadable executable, and marked as having reached end of life.
+
+## Consequences
+
+The codebase may become easier to maintain.
+
+It is possible the PR in which Deno is removed may leave behind artifacts from the Deno implementation. This includes,
+but is not limited to:
+- Implementation details that are a result of the system handling both the node and Deno runtimes
+- Subtle breakages in the codebase in the event of global entities being mutated at build/runtime
+
+## Links
+
+- [0010-deno-vendoring.md](./0010-deno-vendoring.md)
+- [Deno End of Life PR](https://github.com/ionic-team/stencil-site/pull/764)

docs/adr/README.md

@@ -12,3 +12,4 @@
 * [10. deno-vendoring](0010-deno-vendoring.md)
 * [11. karma-testing-constraints](0011-karma-testing-constraints.md)
 * [12. output-markdown-format](0012-output-markdown-format.md)
+* [13. deno-removal](0013-deno-removal.md)

scripts/build.ts

@@ -9,7 +9,6 @@ import { internal } from './bundles/internal';
 import { mockDoc } from './bundles/mock-doc';
 import { release } from './release';
 import { screenshot } from './bundles/screenshot';
-import { sysDeno } from './bundles/sys-deno';
 import { sysNode, sysNodeExternalBundles } from './bundles/sys-node';
 import { testing } from './bundles/testing';
 import { validateBuild } from './test/validate-build';
@@ -52,7 +51,6 @@ export async function createBuild(opts: BuildOptions): Promise<readonly RollupOp
     emptyDir(opts.output.devServerDir),
     emptyDir(opts.output.internalDir),
     emptyDir(opts.output.mockDocDir),
-    emptyDir(opts.output.sysDenoDir),
     emptyDir(opts.output.sysNodeDir),
     emptyDir(opts.output.testingDir),
     updateDependenciesJson(opts),
@@ -68,7 +66,6 @@ export async function createBuild(opts: BuildOptions): Promise<readonly RollupOp
     mockDoc(opts),
     screenshot(opts),
     testing(opts),
-    sysDeno(opts),
     sysNode(opts),
   ]);