WIP: Metro ESM support proposal #634
Draft
+95
−0
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
robhogan
reviewed
Apr 18, 2023
|
|
||
| * **Problem 1:** [Inline requires](https://reactnative.dev/docs/ram-bundles-inline-requires#inline-requires) do not work reliably for `import` declarations ([metro#909](https://github.com/facebook/metro/issues/909)). There is a separate, undocumented preset option, `lazyImportExportTransform`, that controls `import` inlining via the Babel plugin's [`lazy`](https://babeljs.io/docs/babel-plugin-transform-modules-commonjs#lazy) option. | ||
| * **Problem 2:** `Platform` inlining doesn't work for the common case of `import {Platform} from 'react-native'` ([metro#800](https://github.com/facebook/metro/pull/800#issuecomment-1092434015)). | ||
| * **Problem 3:** [Lazy bundling](https://github.com/react-native-community/discussions-and-proposals/blob/main/proposals/0605-lazy-bundling.md) does not work, since Babel transforms away `import()` calls before Metro can process them. |
There was a problem hiding this comment.
I mentioned this in person but just to record it here - for import() specifically, could we theoretically preserve those (which are obviously "inline" already) to unblock lazy bundling without changing our approach top level import?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
No description provided.