We use `bazel/esbuild` in various places (e.g. for app bundling tests).
These tests rely on the Angular Compiler-CLI itself for e.g. linking
or the Terser configuration. Since everything in this repo is now
strict ESM, the ESBuild configs (which are already ESM-supported)
need to import from `//packages/compiler-cli`. We also need to be
able to leverage our existing ESM Bazel loader for this though as
otherwise resolution would fail.
Long-term we can remove this if everything in the compiler-cli
would use `.mjs` extensions and the import paths would also specify
an explicit extension. See: https://nodejs.org/api/esm.html#mandatory-file-extensions
PR Close#48521
The ESM loader when used with patched Bazel module resolution
handled subpaths incorrectly. e.g.
`@bazel/concatjs/tsc_wrapped/internal/index.js` could be incorrectly
resolved to `@bazel/concatjs/index.js`.
This commit fixes the flawed logic. Also we prioritize the ESM attempts
before the original specifier. This is necessary because otherwise
the default Node resolution (using `require.resolve`) may incorrectly
prefer the `index.js` file over a `index.mjs` when a directory is
imported.
PR Close#48521
RxJS currently ships ESM output that cannot be executed directly
in NodeJS. This is because RxJS ships ESM as `.js` files but does
not have a `package.json` which instructs Node to execute these as ESM.
RxJS would either need to use the explicit `.mjs` extension, or add
a `type: module` `package.json` next to the `.js` sources.
We manually patch RxJS to do this, while we wait on the upstream fix
to land. See: #7130.
PR Close#48521
Replaces the existing ESM loader for dealing with external module
imports. This loader was introduced by Aspect for AIO `.mjs` scripts.
The loader will be used as foundation for a more extensive loader
that also properly handles first-party packages.
Additionally another loader is added, all packed as a single
loader because our current NodeJS version only supports a single
loader per node invocation. So we implement chaining ourselves.
The new loader will attempt rewriting `.js` extensions to `.mjs`,
also it will add `.mjs` if not already done. This is necessary
in the transition phase because we don't/cannot use explicit `.mts`
extensions and also we don't specify extensions in imports yet.
Long-term we would likely use `.mts` and explicit import extensions,
but it's not yet clear how we would sync this into g3 too.
PR Close#48521
This is in prearation for having a proper diff when this loader
is adjusted to support more situations than just simple external
node modules. See next commit.
Also the file is formatted to make the diff less verbose later.
The file was never formatted correctly and we don't lint `.mjs` files.
PR Close#48521
