Streams should implement vscode-jsonrpc's _ReadableStream and _WritableStream interfaces

[phated]

After seeing @dbaeumer's talk at WasmCon, I was inspired to compile the Noir LSP to WASI and hook it as the server component via the vscode-wasm harness. The current progress is available at noir-lang/vscode-noir#41

One of the workarounds I needed to do was stubbing the following interfaces:

interface _ReadableStream {
	onData(listener: (data: Uint8Array) => void): Disposable;
	onClose(listener: () => void): Disposable;
	onError(listener: (error: any) => void): Disposable;
	onEnd(listener: () => void): Disposable;
}

interface _WritableStream {
	onClose(listener: () => void): Disposable;
	onError(listener: (error: any) => void): Disposable;
	onEnd(listener: () => void): Disposable;
	write(data: Uint8Array): Promise<void>;
	write(data: string, encoding: _MessageBufferEncoding): Promise<void>;
	end(): void;
}

This allows me to use the Readable and Writable provided by this library as streams for ReadableStreamMessageReader and WriteableStreamMessageWriter. If this library implemented those interfaces, these streams could be used directly without any stubs.

[dbaeumer]

@phated cool idea. I will ensure that this gets easier at least for WASI preview 2 which comes with stream interfaces itself.

[dbaeumer]

I did some first work on this. However since we will move to the component model which comes with yet another stream implementation I will not make this official yet. But you might want to copy the code. It is here:

vscode-wasm/testbeds/lsp-rust/client/src/lspServer.ts

Line 1 in d4fe7c2

/* --------------------------------------------------------------------------------------------