src/vs/workbench/contrib/snippets/browser/snippetsService.ts/SnippetEnablement/constructor
class SnippetEnablement:	constructor(
		@IStorageService private readonly _storageService: IStorageService,
	) {

		const raw = _storageService.get(SnippetEnablement._key, StorageScope.PROFILE, '');
		let data: string[] | undefined;
		try {
			data = JSON.parse(raw);
		} catch { }

		this._ignored = isStringArray(data) ? new Set(data) : new Set();
	}