extensions/typescript-language-features/src/tsServer/cancellation.electron.ts/NodeRequestCanceller/tryCancelOngoingRequest
class NodeRequestCanceller:	public tryCancelOngoingRequest(seq: number): boolean {
		if (!this.cancellationPipeName) {
			return false;
		}
		this._tracer.logTrace(this._serverId, `TypeScript Server: trying to cancel ongoing request with sequence number ${seq}`);
		try {
			fs.writeFileSync(this.cancellationPipeName + seq, '');
		} catch {
			// noop
		}
		return true;
	}