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fix(compiler): persist polyfills on build #4932

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merged 1 commit into from
Oct 16, 2023

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rwaskiewicz
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@rwaskiewicz rwaskiewicz commented Oct 16, 2023

What is the current behavior?

A polyfills directory disappears on every other build on Windows.

Fixes: #4661

What is the new behavior?

in #4317 (b042d8b), a polyfill for node's path.join was removed, but wasn't backfilled with stencil's @utils package version in generate-esm.ts. without this change, the destination computed for the polyfills is not normalized for users of Windows OS's.

when the destination path is not normalized here (but is normalized in other parts of the code), it creates a situation where stencil's in memory-fs both:

  1. marks the polyfills to be copied
  2. marks the previous polyfills to be removed

normally, if we're performing a copy operation, we don't bother with the deletion (as the copy overwrites the existing polyfills). this is important, as stencil performs its copy operations before it performs its deletions. to ensure that a recently copied file is not subsequently deleted, stencil performs a check on the files it will delete and removes them from the 'to delete' list based on the destination filename.

since the destination filename on windows is not normalized and the filename for the same file to delete is (normalized), the check fails to acknowledge we're going to copy this file. this causes the following behavior on a stencil build:

  • if the polyfills directory exists, mark it to be copied, but subsequently delete it
  • if the polyfills directory does not exist, mark it to be copied. it will not be marked to be deleted because it does not exist on disk when the list of files to delete is calculated (prior to the copy)

Does this introduce a breaking change?

  • Yes
  • No

Testing

I tested this on a Windows machine, one where I had a build of this branch: @stencil/[email protected]

Then installed it in the output of creating a new stencil component library:

cd /tmp \
&& npm init stencil@latest component jest-test \
&& cd $_ \
&& npm i @stencil/[email protected]

Once installed, I ran npm run build, and ensured that dist/esm/polyfills was populated. Rerunning the build shows the directory is still populated.

Running this with @stencil/[email protected] will show an alternating pattern - the polyfills directory will always exists, but it's contents will disappear

I also gave a dev build to the folks who were encountering this issue (see issue comments), and had one report over the weekend of this fixing the issue.

Other information

STENCIL-918

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--strictNullChecks error report

Typechecking with --strictNullChecks resulted in 1399 errors on this branch.

That's the same number of errors on main, so at least we're not creating new ones!

reports and statistics

Our most error-prone files
Path Error Count
src/dev-server/index.ts 37
src/mock-doc/serialize-node.ts 36
src/dev-server/server-process.ts 32
src/compiler/build/build-stats.ts 27
src/compiler/output-targets/dist-lazy/generate-lazy-module.ts 25
src/compiler/style/test/optimize-css.spec.ts 23
src/testing/puppeteer/puppeteer-element.ts 23
src/compiler/prerender/prerender-main.ts 22
src/runtime/vdom/vdom-render.ts 20
src/runtime/client-hydrate.ts 19
src/screenshot/connector-base.ts 19
src/compiler/config/test/validate-paths.spec.ts 16
src/dev-server/request-handler.ts 15
src/compiler/prerender/prerender-optimize.ts 14
src/compiler/sys/stencil-sys.ts 14
src/compiler/transpile/transpile-module.ts 14
src/runtime/vdom/vdom-annotations.ts 14
src/sys/node/node-sys.ts 14
src/compiler/build/build-finish.ts 13
src/compiler/prerender/prerender-queue.ts 13
Our most common errors
Typescript Error Code Count
TS2345 424
TS2322 398
TS18048 310
TS18047 100
TS2722 38
TS2532 34
TS2531 23
TS2454 14
TS2352 13
TS2769 10
TS2790 10
TS2538 8
TS2344 5
TS2416 4
TS2493 3
TS18046 2
TS2684 1
TS2488 1
TS2430 1

Unused exports report

There are 12 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/runtime/bootstrap-lazy.ts 21 setNonce
src/screenshot/screenshot-fs.ts 18 readScreenshotData
src/testing/testing-utils.ts 198 withSilentWarn
src/utils/index.ts 140 CUSTOM
src/compiler/app-core/app-data.ts 25 BUILD
src/compiler/app-core/app-data.ts 114 Env
src/compiler/app-core/app-data.ts 116 NAMESPACE
src/compiler/fs-watch/fs-watch-rebuild.ts 123 updateCacheFromRebuild
src/compiler/types/validate-primary-package-output-target.ts 62 satisfies
src/compiler/types/validate-primary-package-output-target.ts 62 Record
src/testing/puppeteer/puppeteer-declarations.ts 485 WaitForEventOptions
src/compiler/sys/fetch/write-fetch-success.ts 7 writeFetchSuccessSync

in #4317 (b042d8b), a polyfill for node's `path.join` was [removed](https://github.com/ionic-team/stencil/pull/4317/files#diff-734f69edf83052dfd5ce6df10429550680537c6da66ef9b7cfbda11efdff5117L36),
but wasn't backfilled with stencil's `@utils` package version in
`generate-esm.ts`. without this change, the destination computed for the
polyfills is not normalized for users of Windows OS's.

when the destination path is not normalized here (but is normalized in
other parts of the code), it creates a situation where stencil's in
memory-fs both:
1. marks the polyfills to be copied
2. marks the _previous_ polyfills to be removed

normally, if we're performing a copy operation, we don't bother with the
deletion (as the copy overwrites the existing polyfills). this is
important, as stencil performs its copy operations before it performs
its deletions. to ensure that a recently copied file is not subsequently
deleted, stencil performs a [check on the files it will delete and
removes them from the 'to delete' list](https://github.com/ionic-team/stencil/blob/15a7f89f677bad012dd82a088ce64149a7e48a61/src/compiler/sys/in-memory-fs.ts#L1250-L1253)
based on the destination filename.

since the destination filename on windows is not normalized and the
filename for the same file to delete is (normalized), the check fails to
acknowledge we're going to copy this file. this causes the following
behavior on a stencil build:
- if the polyfills directory exists, mark it to be copied, but
  subsequently delete it
- if the polyfills directory does not exist, mark it to be copied. it
  will not be marked to be deleted because it does not exist on disk
  when the list of files to delete is calculated (prior to the copy)

Fixes: #4661

STENCIL-918
@rwaskiewicz rwaskiewicz force-pushed the rwaskiewicz/polyfills-fix branch from 0a1efbd to 7ef28da Compare October 16, 2023 12:40
@rwaskiewicz rwaskiewicz marked this pull request as ready for review October 16, 2023 12:46
@rwaskiewicz rwaskiewicz requested a review from a team as a code owner October 16, 2023 12:46
@rwaskiewicz rwaskiewicz added this pull request to the merge queue Oct 16, 2023
Merged via the queue into main with commit b97dadc Oct 16, 2023
52 checks passed
@rwaskiewicz rwaskiewicz deleted the rwaskiewicz/polyfills-fix branch October 16, 2023 20:27
rwaskiewicz added a commit that referenced this pull request Nov 9, 2023
this patch ensures that paths are properly normalized by the compiler.
this ensures that regardless of the platform (operating system) that a
project is compiled on, paths are uniformly treated internally by
stencil. this has system-wide reaching effects - from the in-memory
filesystem, to configuration/output target validation, and file
generation.

previously, stencil's in-browser compilation support included a polyfill
for the following NodeJS `path` module functions: `join`, `normalize`,
`relative` & `resolve`. this polyfill did the following:
- it wrapped each of the aforementioned functions in a `normalizePath`
  function to convert Windows-style path separators (`\\`) to
  Unix/POSIX-style path separators (`/`)
- it overwrote the standard NodeJS `path` implementations for each of
  these functions.
as a result, calling `join` or any of the other three methods, even when
importing the method from `path` like below would result in the polyfill
being called:
```ts
import { join } from 'path'; // this imports the polyfilled `join`

// runs the native `path.join`, then normalizes the returned path
const filePath = join(part1, part2);
```

while this was 'nice' in that stencil engineers didn't need to think
about which implementation of `path` functions they were using, this
polyfill made some behavior of the compiler hard to understand.

the polyfills were removed in #4317 (b042d8b). this led to calls to the
aforementioned functions to call their original implementations, rather
than the wrapped implementations:
```ts
import { join } from 'path'; // imports Node's `join`

// run the native `path.join`, without any normalization
const filePath = join(part1, part2);
```

discrepencies arose where parts of the code would explicitly wrap a
call to `join()` (or one of its ilk) around a path normalization
function. this caused paths to not be uniformly normalized throughout
the codebase, leading to errors.

since the removal of in-browser compilation, additional pull requests
to fix path-related issues on windows have landed in the codebase:
- #4545 (cd58d9c)
- #4932 (b97dadc)

this commit builds on the previous commits by attempting to move
stencil's compiler completely over to polyfilled versions of the
mentioned `path` functions that are explicitly imported/called.

Some of the changes found herein were created/validated using Alice's
codemod branch, #4996
Co-authored-by: alicewriteswrongs <[email protected]>

STENCIL-975 Determine Scope of Path Polyfill Bug, Fix

Fixes: #4980
Fixes: #4961

Spun Off: #5036, #5032, #5029
github-merge-queue bot pushed a commit that referenced this pull request Nov 10, 2023
* fix(compiler): normalize paths on windows

this patch ensures that paths are properly normalized by the compiler.
this ensures that regardless of the platform (operating system) that a
project is compiled on, paths are uniformly treated internally by
stencil. this has system-wide reaching effects - from the in-memory
filesystem, to configuration/output target validation, and file
generation.

previously, stencil's in-browser compilation support included a polyfill
for the following NodeJS `path` module functions: `join`, `normalize`,
`relative` & `resolve`. this polyfill did the following:
- it wrapped each of the aforementioned functions in a `normalizePath`
  function to convert Windows-style path separators (`\\`) to
  Unix/POSIX-style path separators (`/`)
- it overwrote the standard NodeJS `path` implementations for each of
  these functions.
as a result, calling `join` or any of the other three methods, even when
importing the method from `path` like below would result in the polyfill
being called:
```ts
import { join } from 'path'; // this imports the polyfilled `join`

// runs the native `path.join`, then normalizes the returned path
const filePath = join(part1, part2);
```

while this was 'nice' in that stencil engineers didn't need to think
about which implementation of `path` functions they were using, this
polyfill made some behavior of the compiler hard to understand.

the polyfills were removed in #4317 (b042d8b). this led to calls to the
aforementioned functions to call their original implementations, rather
than the wrapped implementations:
```ts
import { join } from 'path'; // imports Node's `join`

// run the native `path.join`, without any normalization
const filePath = join(part1, part2);
```

discrepencies arose where parts of the code would explicitly wrap a
call to `join()` (or one of its ilk) around a path normalization
function. this caused paths to not be uniformly normalized throughout
the codebase, leading to errors.

since the removal of in-browser compilation, additional pull requests
to fix path-related issues on windows have landed in the codebase:
- #4545 (cd58d9c)
- #4932 (b97dadc)

this commit builds on the previous commits by attempting to move
stencil's compiler completely over to polyfilled versions of the
mentioned `path` functions that are explicitly imported/called.

Some of the changes found herein were created/validated using Alice's
codemod branch, #4996
Co-authored-by: alicewriteswrongs <[email protected]>

STENCIL-975 Determine Scope of Path Polyfill Bug, Fix

Fixes: #4980
Fixes: #4961

Spun Off: #5036, #5032, #5029

* fix validate-dist-collection tests

* fix prerendered-write-path test

* fix stencil-types tests

this commit removes a spy on `join.resolve` and updates the mocks to
properly spy on the wrapped `@utils`' `resolve` fn

* fix validate-paths tests

this commit updates the tests for `validate-paths`. it replaces
instances of `path.join` in assertions with stencil's own `join`
function. existing instances of `path.join` have been left as-is if they
pertain to user input. this allows us to exercise a user using either
path separator in CI (which runs in windows and linux).

the cache directory is now normalized if it is absolute. otherwise,
provided cache directories in `stencil.config.ts` would never get
normalized

* fix validate-output-www tests

this commit updates the tests for `validate-paths`. it replaces
instances of `path.join` in assertions with stencil's own `join`
function. existing instances of `path.join` have been left as-is if they
pertain to user input. this allows us to exercise a user using either
path separator in CI (which runs in windows and linux).

* fix validate-output-dist tests

this commit updates the tests for `validate-output`. it replaces
instances of `path.join` in assertions with stencil's own `join`
function. existing instances of `path.join` have been left as-is if they
pertain to user input. this allows us to exercise a user using either
path separator in CI (which runs in windows and linux).

this commit also switches `output-target.ts#getcomponentsDtsSrcFilePath`
over to use Stencil's join function to fix the tests

* fix validate-output-dist-custom-element tests

this commit updates the tests for `validate-output-dist-custom-element`.
it replaces instances of `path.join` in assertions with stencil's own `join
function. existing instances of `path.join` have been left as-is if they
pertain to user input. this allows us to exercise a user using either
path separator in CI (which runs in windows and linux).

* fix validate-testing tests

this commit updates the tests for `validate-testing`. it replaces
instances of `path.join` in assertions with stencil's own `join`
function. existing instances of `path.join` have been left as-is if they
pertain to user input. this allows us to exercise a user using either
path separator in CI (which runs in windows and linux).

the screenshot connector is now normalized if it is absolute. otherwise,
provided connector file path in `stencil.config.ts` would never get
normalized
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bug: dist/esm/polyfills is empty
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