feat(npm/runtime): add decorateMetadata helper function

[Dunqing]

Copy from https://github.com/microsoft/TypeScript/blob/d85767abfd83880cea17cea70f9913e9c4496dcc/src/compiler/factory/emitHelpers.ts#L744-L753

[Dunqing]

• test(transformer/legacy-decorator): add an exec test that verifies it working with reflect-metadata well. #9219
• feat(napi/transform): support enabling emitDecoratorMetadata #9190
• feat(npm/runtime): add decorateMetadata helper function #9189 👈 (View in Graphite)
• feat(transformer/decorator): support emitting decorator metadata #9057
• test(transformer/legacy-decorator): update update-fixtures for emitDecoratorMetadata #9185
• main

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[overlookmotel]

Reflect.metadata is not a native JS API. According to TS docs, it requires NPM package https://www.npmjs.com/package/reflect-metadata to "polyfill" this API.

Just checking that we don't need to do anything on our side to insert import 'reflect-metadata'; or something?

I assume the idea is that the user would handle this themselves, but I'm not up to speed on this whole decorator metadata thing, so I just wanted to check.

[Dunqing]

Reflect.metadata is not a native JS API. According to TS docs, it requires NPM package https://www.npmjs.com/package/reflect-metadata to "polyfill" this API.

Just checking that we don't need to do anything on our side to insert import 'reflect-metadata'; or something?

I assume the idea is that the user would handle this themselves, but I'm not up to speed on this whole decorator metadata thing, so I just wanted to check.

Yes, we don't need to do anything with reflect-metadata, this usually proceeds by DI Framework like NestJS. NestJS documentation mentioned, that if you want to create a NestJS APP from scratch, you need to manually add a few dependencies one of them is reflect-metadata.

[overlookmotel]

Great. Thanks for explaining.

[graphite-app]

Merge activity

• Feb 19, 9:04 AM EST: A user added this pull request to the Graphite merge queue.
• Feb 19, 9:14 AM EST: A user merged this pull request with the Graphite merge queue.