feat: enhance connection validation and node creation logic, improve type handling in various components

frontend/src/nunjucks.d.ts

@@ -0,0 +1,18 @@
+declare module 'nunjucks' {
+  export interface Loader {
+    getSource(name: string): { src: string; path: string } | null
+  }
+  export interface Environment {
+    render(name: string, context: Record<string, unknown>, callback: (err: Error | null, res: string) => void): void
+    addFilter(name: string, fn: (...args: unknown[]) => void, async?: boolean): void
+    getFilter(name: string): (...args: unknown[]) => void
+  }
+  export class Environment {
+    constructor(loaders?: Loader[], opts?: { autoescape?: boolean })
+    render(name: string, context: Record<string, unknown>, callback: (err: Error | null, res: string) => void): void
+    addFilter(name: string, fn: (...args: unknown[]) => void, async?: boolean): void
+    getFilter(name: string): (...args: unknown[]) => void
+  }
+  const nunjucks: { Environment: typeof Environment }
+  export default nunjucks
+}