ReadableStream.from not in documentation or types

[mdekstrand]

#19417 added the ReadableStream.from method, and various functions in std are marked as deprecated, but this method appears in neither the documentation nor the type definitions. It works, but code using it fails deno check.

[kt3k]

What is your deno version? Do you modify the type settings? ReadableStream.from is defined in https://github.com/dsherret/deno/blob/26cf06ed9f5c0ffa42afff3dbe29533ddcb2fbf7/ext/web/lib.deno_web.d.ts#L815-L817 and it should pass type check with deno check with the default type settings.

[mdekstrand]

I'm on Deno 1.39.1 with lib set to deno.window; if I remove the lib entirely from deno.json, it still fails to typecheck.

I do now see the from method displayed in the type in the documentation.

Here's the Deno error:

error: TS2339 [ERROR]: Property 'from' does not exist on type '{ new (underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number | undefined; } | undefined): ReadableStream<Uint8Array>; new <R = any>(underlyingSource: UnderlyingDefaultSource<...>, strategy?: QueuingStrategy<...> | undefined): ReadableStream<...>; new <R = any>(underlyingSource?: UnderlyingSourc...'.
let reader = ReadableStream.from(
                            ~~~~
    at file:///Users/michael/Documents/web/md.ekstrandom.net/tools/render.ts:43:29

However, when I try to create a minimal reproducing example, it does pass the typechecker, so it looks like something else is going on here. (Interestingly, my MRE typechecks with deno check at the CLI, but not in VSCode.)

Attempted MRE

import { CsvStringifyStream } from "std/csv/mod.ts";

let perfOut = await Deno.open("build/performance.csv", {
  create: true,
  write: true,
  truncate: true,
});
let recOut = new CsvStringifyStream({
  columns: ["name", "startTime", "duration", "detail"],
});
let reader = ReadableStream.from(
  performance.getEntriesByType("measure") as unknown as Record<string, unknown>[],
);
await reader.pipeThrough(recOut).pipeThrough(new TextEncoderStream()).pipeTo(perfOut.writable);

[BlackAsLight]

While it does seem to have type checking for the deno.window lib. Try literally any other lib, like deno.ns and it no longer exists.

ReadableStream.from(example())

function* example() {

}

{
	"compilerOptions": {
		"lib": [
			"dom",
			"deno.ns"
		]
	}
}

[crowlKats]

Seems the dom library doesnt have the typings for ReadableStream.from: https://github.com/denoland/deno/blob/main/cli/tsc/dts/lib.dom.d.ts#L18507-L18512