extensions/typescript-language-features/src/utils/typingsStatus.ts/TypingsStatus/onBeginInstallTypings
class TypingsStatus:	private onBeginInstallTypings(eventId: number): void {
		if (this._acquiringTypings.has(eventId)) {
			return;
		}
		this._acquiringTypings.set(eventId, setTimeout(() => {
			this.onEndInstallTypings(eventId);
		}, typingsInstallTimeout));
	}