extensions/typescript-language-features/src/tsServer/versionManager.ts/TypeScriptVersionManager/updateActiveVersion
class TypeScriptVersionManager:	private updateActiveVersion(pickedVersion: TypeScriptVersion) {
		const oldVersion = this.currentVersion;
		this._currentVersion = pickedVersion;
		if (!oldVersion.eq(pickedVersion)) {
			this._onDidPickNewVersion.fire();
		}
	}