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chore: add DOM.AsyncIterable lib and use standard filesystem types

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Add `DOM.AsyncIterable` to the shared TypeScript configuration in
`@backstage/cli`, making standard async iteration methods available on
DOM APIs like `FileSystemDirectoryHandle`. This aligns behavior with
TypeScript 6.0, where this lib is included in `DOM` by default.

With the async iterable types now available, replace the custom
`IterableDirectoryHandle` and `WritableFileHandle` types in the scaffolder
plugin with the standard `FileSystemDirectoryHandle` and
`FileSystemFileHandle` DOM types. Add type guard functions for
`FileSystemHandle` since it is not a discriminated union.

Signed-off-by: Jon Koops <jonkoops@gmail.com>
This commit is contained in:
Jon Koops
2026-03-26 16:23:46 +01:00
parent a9dd4fd28d
commit a7a14b78c1
6 changed files with 34 additions and 31 deletions
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.changeset/ts6-cli-dom-asynciterable.md
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'@backstage/cli': patch
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Added `DOM.AsyncIterable` to the default `lib` in the shared TypeScript configuration, enabling standard async iteration support for DOM APIs such as `FileSystemDirectoryHandle`. This aligns behavior with [TypeScript 6.0](https://devblogs.microsoft.com/typescript/announcing-typescript-6-0/#the-dom-lib-now-contains-domiterable-and-domasynciterable), where this lib is included in `DOM` by default.
.changeset/ts6-plugin-scaffolder.md
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'@backstage/plugin-scaffolder': patch
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Removed custom `IterableDirectoryHandle` and `WritableFileHandle` types in favor of the standard DOM `FileSystemDirectoryHandle` and `FileSystemFileHandle` types, which are now available through the `DOM.AsyncIterable` lib added to the shared TypeScript configuration.