src/vs/editor/contrib/suggest/wordContextKey.ts/WordContextKey/constructor
class WordContextKey:	constructor(
		private readonly _editor: ICodeEditor,
		@IContextKeyService contextKeyService: IContextKeyService,
	) {

		this._ckAtEnd = WordContextKey.AtEnd.bindTo(contextKeyService);
		this._configListener = this._editor.onDidChangeConfiguration(e => e.hasChanged(EditorOption.tabCompletion) && this._update());
		this._update();
	}