feat(editor): Introduce proxy completions to expressions (#5075)

* ⚡ Introduce proxy completions to expressions

* 🧪 Add tests

* ⚡ Replace snippet with alphabetic char completions

* ⚡ Tighten `DateTime` check

* 🧹 Clean up `n8nLang`

* 🔥 Remove duplicate

* 👕 Remove non-null assertion

* ⚡ Confirm that `overlay` is needed

* 🔥 Remove comment

* 🔥 Remove more unneeded code

* 🔥 Remove unneded Pinia setup

* ⚡ Simplify syntax

packages/editor-ui/src/components/CodeNodeEditor/completions/jsonField.completions.ts

@@ -1,11 +1,12 @@
 import Vue from 'vue';
-import { isAllowedInDotNotation, escape, toVariableOption } from '../utils';
+import { escape, toVariableOption } from '../utils';
 import type { Completion, CompletionContext, CompletionResult } from '@codemirror/autocomplete';
 import type { IDataObject, IPinData, IRunData } from 'n8n-workflow';
 import type { CodeNodeEditorMixin } from '../types';
 import { mapStores } from 'pinia';
 import { useWorkflowsStore } from '@/stores/workflows';
 import { useNDVStore } from '@/stores/ndv';
+import { isAllowedInDotNotation } from '@/plugins/codemirror/completions/utils';
 
 export const jsonFieldCompletions = (Vue as CodeNodeEditorMixin).extend({
 	computed: {

packages/editor-ui/src/components/CodeNodeEditor/completions/luxon.completions.ts

@@ -76,7 +76,7 @@ export const luxonCompletions = (Vue as CodeNodeEditorMixin).extend({
 		/**
 		 * Complete `DateTime` with luxon `DateTime` static methods.
 		 */
-		dateTimeCompltions(context: CompletionContext, matcher = 'DateTime'): CompletionResult | null {
+		dateTimeCompletions(context: CompletionContext, matcher = 'DateTime'): CompletionResult | null {
 			const pattern = new RegExp(`${escape(matcher)}\..*`);
 
 			const preCursor = context.matchBefore(pattern);