src/vs/base/node/processes.ts/LineProcess/handleClose
class LineProcess:	protected override handleClose(data: any, cc: ValueCallback<SuccessData>, pp: ProgressCallback<LineData>, ee: ErrorCallback): void {
		const stdoutLine = this.stdoutLineDecoder ? this.stdoutLineDecoder.end() : null;
		if (stdoutLine) {
			pp({ line: stdoutLine, source: Source.stdout });
		}
		const stderrLine = this.stderrLineDecoder ? this.stderrLineDecoder.end() : null;
		if (stderrLine) {
			pp({ line: stderrLine, source: Source.stderr });
		}
	}