src/vs/workbench/services/extensions/common/extensionsRegistry.ts/ExtensionPoint/constructor
class ExtensionPoint:	constructor(name: string, defaultExtensionKind: ExtensionKind[] | undefined) {
		this.name = name;
		this.defaultExtensionKind = defaultExtensionKind;
		this._handler = null;
		this._users = null;
		this._delta = null;
	}