Function wrapStream

src/bootstrap-fork.ts:118–137

* Wraps process.stderr/stdout.write() so that it is transmitted to the * renderer or CLI. It both calls through to the original method as well * as to console.log with complete lines so that they're made available * to the debugger/CLI.

(streamName: 'stdout' | 'stderr', severity: 'log' | 'warn' | 'error')

	 * to the debugger/CLI.
	 */
	function wrapStream(streamName: 'stdout' | 'stderr', severity: 'log' | 'warn' | 'error'): void {
		const stream = process[streamName];
		const original = stream.write;

		let buf = '';

		Object.defineProperty(stream, 'write', {
			set: () => { },
			get: () => (chunk: string | Buffer | Uint8Array, encoding: BufferEncoding | undefined, callback: ((err?: Error | null) => void) | undefined) => {
				buf += chunk.toString(encoding);
				const eol = buf.length > MAX_STREAM_BUFFER_LENGTH ? buf.length : buf.lastIndexOf('\n');
				if (eol !== -1) {
					console[severity](buf.slice(0, eol));
					buf = buf.slice(eol + 1);
				}

				original.call(stream, chunk, encoding, callback);
			},
		});
	}

	// Pass console logging to the outside so that we have it in the main side if told so
	if (process.env['VSCODE_VERBOSE_LOGGING'] === 'true') {