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An extensionless import from a `.js` or `.jsx` file of a TypeScript module, like mastodon's `import AudioModal from './audio_modal'` in modal_root.jsx beside audio_modal.tsx, never resolved by path: the import resolver's javascript and jsx extension lists held only JavaScript extensions, while the typescript and tsx lists already try `.js`/`.jsx`. In a codebase moving to TypeScript those imports were matched by name instead, so an import under another name linked nothing, and a repeated name could link the wrong file (mastodon's `<IconButton>` and `<Status>` tags rendered other same-named components than the ones each file imports). The javascript and jsx lists now try `.ts`/`.tsx` (and their index files) after their own extensions, as a bundler and tsc's allowJs resolve them. JavaScript stays first, so a `helpers.ts` beside `helpers.js` does not take its importers, and never `.d.ts`, which is no module a JavaScript file runs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>