Add support for duplex: "half" in RequestInit interface

[ruochenjia]

Acknowledgement

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Comment

Latest Chrome browser requires setting duplex: "half" flag for the construction of all requests with a streaming body:

However this option does not seem to exist in the RequestInit interface in lib.dom.d.ts, so users cannot construct a Request object with a ReadableStream body without causing an error when running in Chrome.

Currently the only workaround for this issue is to cast the RequestInit object to any, but it is not considered to be a proper solution.

const body: ReadableStream<any> = ...
const request = new Request("https://example.com/", {
  body: body,
  method: "POST",
  duplex: "half"
} as any);

[MartinJohns]

Duplicate of microsoft/TypeScript-DOM-lib-generator#1483.

Currently the only workaround for this issue is to cast the RequestInit object to any

Or use declaration merging and extend the type locally.

[RyanCavanaugh]

There's a lib change template, please use it.