extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts/SyncedBuffer/close
class SyncedBuffer:	public close(): boolean {
		if (this.state !== BufferState.Open) {
			this.state = BufferState.Closed;
			return false;
		}
		this.state = BufferState.Closed;
		return this.synchronizer.close(this.resource, this.filepath);
	}