Sourced from web-streams-polyfill's releases.

v3.2.1

• 🐛 Fix an error in very old browsers where Function.name is non-configurable. (#112)

v3.2.0

• 👎 Deprecate WritableStreamDefaultController.abortReason (#102)
  • Use WritableStreamDefaultController.signal.reason instead.
• 👓 Align with spec version 4b6b93c (#103)

v3.1.1

• 🐛 Fix compatibility with TypeScript's DOM types for ReadableStream and TransformStream (#85, #86)

v3.1.0

• 🚀 Calling ReadableStream.tee() on a readable byte stream now returns two readable byte streams. (#81)
• 🚀 Add WritableStreamDefaultController.signal and .abortReason. (#81)
  • .signal requires a global AbortController constructor to be available. If necessary, use a polyfill.
• 🐛 Make sure streams created with a different version of the polyfill do not pass the brand checks. (#75, #77)
• 👓 Align with spec version cada812 (#79, #81)

v3.0.3

• 💅 Change Promise<void> to Promise<undefined> in TypeScript type definitions (#72)
• 🐛 Fix ReadableStream.tee() resolving its cancel() promise too early (#73)
• 👓 Align with spec version 6762cdb (#73)

v3.0.2

• 👓 Align with spec version 200c971 (#69)

v3.0.1

• 📝 Add documentation to type definitions (#62)
• 👓 Align with spec version 6cd5e81 (#63)
• 🐛 Fix an issue where the polyfill could throw an error when resolving/rejecting reader.closed when it was already resolved/rejected (#66, #67)

v3.0.0

• 💥 Align with spec version 62fe4c8 (#52, #57, #59)
  This includes the following breaking changes:
  • All classes are now exposed globally. Concretely, this adds the following classes:
    • ReadableStreamDefaultController
    • ReadableByteStreamController
    • ReadableStreamBYOBRequest
    • ReadableStreamDefaultReader
    • ReadableStreamBYOBReader
    • WritableStreamDefaultController
    • WritableStreamDefaultWriter
    • TransformStreamDefaultController
  • ReadableStream.getIterator() is renamed to ReadableStream.values()
  • ReadableByteStreamController.byobRequest can be null (instead of undefined) if there is no current BYOB request.
  • ReadableStreamBYOBRequest.view can be null (instead of undefined) if the BYOB request has already been responded to.
  • Constructors and methods have stricter type checking for object arguments. For example, new ReadableStream(null) would previously behave like new ReadableStream({}), but now it throws a TypeError instead.
  • Some constructors and methods may throw slightly different errors when given invalid arguments.
  • Various byte-stream-related APIs now prohibit zero-length views or buffers.
  • The async iterator of a ReadableStream now behaves more like an async generator, e.g. returning promises fulfilled with { value: undefined, done: true } after return()ing the iterator, instead of returning a rejected promise.

... (truncated)

Sourced from web-streams-polyfill's changelog.

v3.2.1 (2022-04-07)

• 🐛 Fix an error in very old browsers where Function.name is non-configurable. (#112)

v3.2.0 (2021-11-06)

• 👎 Deprecate WritableStreamDefaultController.abortReason (#102)
  • Use WritableStreamDefaultController.signal.reason instead.
• 👓 Align with spec version 4b6b93c (#103)

v3.1.1 (2021-09-06)

• 🐛 Fix compatibility with TypeScript's DOM types for ReadableStream and TransformStream (#85, #86)

v3.1.0 (2021-07-21)

• 🚀 Calling ReadableStream.tee() on a readable byte stream now returns two readable byte streams. (#81)
• 🚀 Add WritableStreamDefaultController.signal and .abortReason. (#81)
  • .signal requires a global AbortController constructor to be available. If necessary, use a polyfill.
• 🐛 Make sure streams created with a different version of the polyfill do not pass the brand checks. (#75, #77)
• 👓 Align with spec version cada812 (#79, #81)

v3.0.3 (2021-04-09)

• 💅 Change Promise<void> to Promise<undefined> in TypeScript type definitions (#72)
• 🐛 Fix ReadableStream.tee() resolving its cancel() promise too early (#73)
• 👓 Align with spec version 6762cdb (#73)

v3.0.2 (2021-02-10)

• 👓 Align with spec version 200c971 (#69)

v3.0.1 (2020-11-12)

• 📝 Add documentation to type definitions (#62)
• 👓 Align with spec version 6cd5e81 (#63)
• 🐛 Fix an issue where the polyfill could throw an error when resolving/rejecting reader.closed when it was already resolved/rejected (#66, #67)

v3.0.0 (2020-07-20)

• 💥 Align with spec version 62fe4c8 (#52, #57, #59)
  This includes the following breaking changes:
  • All classes are now exposed globally. Concretely, this adds the following classes:
    • ReadableStreamDefaultController
    • ReadableByteStreamController
    • ReadableStreamBYOBRequest
    • ReadableStreamDefaultReader
    • ReadableStreamBYOBReader
    • WritableStreamDefaultController
    • WritableStreamDefaultWriter

... (truncated)

• d354a74 3.2.1
• d8b5336 Update changelog [skip ci]
• ed44d09 Merge pull request #112 from MattiasBuelens/fix-function-name-non-configurable
• cdd9522 Update changelog
• e114c3d Fix error when trying to override a non-configurable "name" property
• 0926076 Bump ansi-regex from 5.0.0 to 5.0.1 (#104)
• 224d853 3.2.0
• 3223cc2 Update changelog [skip ci]
• 1555788 Merge pull request #102 from MattiasBuelens/deprecate-wc-abort-reason
• afc34b3 Update changelog
• Additional commits viewable in compare view

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