* Implements languageId support

* Implements typing of helper functions
* Shift+F1 opens a new debug visualizer window if none is opened yet

webview/src/components/ExpressionInput.tsx

@@ -10,7 +10,7 @@ export class ExpressionInput extends React.Component<{ model: Model }> {
 	@observable private contentHeight: number | undefined = undefined;
 	private model = monaco.editor.createModel(
 		"",
-		"text",
+		"javascript",
 		monaco.Uri.parse(`file:///main.ts`)
 	);
 
@@ -54,6 +54,11 @@ export class ExpressionInput extends React.Component<{ model: Model }> {
 		}
 	});
 
+	@disposeOnUnmount
+	private _updateLanguageId = autorun(() => {
+		monaco.editor.setModelLanguage(this.model, this.props.model.languageId);
+	});
+
 	private readonly setEditorDiv = (editorDiv: HTMLDivElement) => {
 		if (!editorDiv) {
 			return;