src/vs/workbench/services/extensions/common/abstractExtensionService.ts/AbstractExtensionService/activationEventIsDone
class AbstractExtensionService:	public activationEventIsDone(activationEvent: string): boolean {
		if (!this._installedExtensionsReady.isOpen()) {
			return false;
		}
		if (!this._registry.containsActivationEvent(activationEvent)) {
			// There is no extension that is interested in this activation event
			return true;
		}
		return this._extensionHostManagers.every(manager => manager.activationEventIsDone(activationEvent));
	}