Fix sourceMappingURL for bundles with multiple entry points [CSS]

[powerc9000]

↪️ Pull Request

Fixes css source map being at the incorrect URL same as #2645
This is to move a PR #2867 into V2
Related issue #2851

💻 Examples

Given the followong CLI command

parcel build src/a/style.css src/b/style.css

The following files are produced

dist/a/style.css /*# sourceMappingURL=/style.css.map */
dist/b/style.css /*# sourceMappingURL=/style.css.map */

The sourcemap URLs are incorrect they should be /a/style.css.map and /b/style.css.map.

With the fix in place we instead get:

dist/a/style.css /*# sourceMappingURL=/a/style.css.map */
dist/b/style.css /*# sourceMappingURL=/b/style.css.map */

✔️ PR Todo

• [ x] Added/updated unit tests for this change
• [ x] Filled out test instructions (In case there aren't any unit tests)
• [x ] Included links to related issues/PRs

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This pull request has been linked to T-190.

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This pull request has been linked to T-246.

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This pull request has been linked to T-1.

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This pull request has been linked to T-208.

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This pull request has been linked to T-88.

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This pull request has been linked to T-249.

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This pull request has been linked to T-227.

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This pull request has been linked to T-233.

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This pull request has been linked to T-74.

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This pull request has been linked to T-220.

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This pull request has been linked to T-228.

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This pull request has been linked to T-206.

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This pull request has been linked to T-163.

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This pull request has been linked to T-185.

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This pull request has been linked to T-16.

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This pull request has been linked to T-93.

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This pull request has been linked to T-177.

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This pull request has been linked to T-234.

[DeMoorJasper]

Could you run prettier over this using yarn format and ensure CI/CD passes

[devongovett]

This is still editing Parcel 1, not Parcel 2. Doesn't look like we have css source map support in v2 at all yet?

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This pull request has been linked to T-302.

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This pull request has been linked to T-296.

[DeMoorJasper]

Gonna close this as v2 has no source maps in css yet.

Feel free to contribute css sourcemaps support for parcel 2

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This pull request has been linked to T-232.

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This pull request has been linked to 21 tasks:

• T-190 Investigate why a variable is renamed in is-v2-ready-yet causing the graph to be too narrow (unlink task)
• T-246 Don't use markdown for filepaths in diagnostic formatter (unlink task)
• T-1 Inline scripts and styles in HTML (unlink task)
• T-249 Re-enable log deduplication on logger (unlink task)
• T-88 Validate environment properties (context, outputFormat) (unlink task)
• T-208 Track diagnostics in resolver (unlink task)
• T-227 Fix @parcel/cache: #<Promise> could not be cloned in integration tests (unlink task)
• T-74 Inline source maps (unlink task)
• T-233 Fix re-exporting in ts types and scope hoisting (unlink task)
• T-93 Build all packages in a monorepo (unlink task)
• T-206 Validate .parcelrc with diagnostics (like targets) (unlink task)
• T-232 Fix asset deferring with library output (unlink task)
• T-302 Replace ink with stdout (unlink task)
• T-185 Handle Tabs properly when rendering a codeframe, converting them to spaces and offsetting highlights if needed (unlink task)
• T-220 Transformation#runPipeline / Pipeline#transform fail if type changes but pipline doesn't (unlink task)
• T-228 Escape HTML in HMR errors (unlink task)
• T-16 Error handling - code frames (unlink task)
• T-163 Add a Logger instance to each plugin call (unlink task)
• T-296 MDX Transformer (unlink task)
• T-177 update dev and hmr server to properly use diagnostic objects (unlink task)
• T-234 Fix sideEffects: false and commonjs output (unlink task)

💡Tip: Add "Close T-190" to the pull request title or description, to a commit message, or in a comment to mark this task as "Done" when the pull request is merged.