fix(codemirror): apply the engine-helper :any type-aids to angular

The codegen annotates langExt/themeExt/phExt and buildMarkers returns `: any`
to satisfy strict tsc on the type-checked leaves (TS2742 not-nameable, TS2345
unknown-not-Extension, TS2322 RangeSet widening). The guards excluded angular —
correct when it shipped source-only, stale under the dist+source standard where
ng-packagr runs real ngc/tsc. Angular emits the same `name = () =>` /
`const buildMarkers = (mView: any) =>` token forms as Lit/the bundled leaves,
so it joins those two guards. Unblocks the codemirror angular leaf.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KcWqckxMNtbU5LGEAvYXEk

Author: serpentblade

packages/ui/codemirror/packages/angular/src/CodeMirror.ts

@@ -582,7 +582,7 @@ export class CodeMirror {
       // Recompute the marker RangeSet from `gutterLines` against the live doc —
       // one marker at the START of each in-range line. RangeSet.of REQUIRES the
       // ranges sorted by `from`, so sort the resolved positions.
-      const buildMarkers = (mView: any) => {
+      const buildMarkers = (mView: any): any => {
         const doc = mView.state.doc;
         const ranges = [];
         for (const n of this.gutterLines() as any) {
@@ -734,8 +734,8 @@ export class CodeMirror {
   decorationCompartment = new Compartment();
   rebuildGutterExt: any = null;
   rebuildDecorationExt: any = null;
-  langExt = () => this.language() === 'javascript' ? javascript() : [];
-  themeExt = () => {
+  langExt = (): any => this.language() === 'javascript' ? javascript() : [];
+  themeExt = (): any => {
     const t = this.theme();
     if (t === 'dark') return oneDark;
     if (t === 'light' || t === '' || t == null) return [];
@@ -745,7 +745,7 @@ export class CodeMirror {
     // accept it; the type-neutral targets strip types entirely.
     return t;
   };
-  phExt = () => this.placeholder() ? placeholderExt(this.placeholder()) : [];
+  phExt = (): any => this.placeholder() ? placeholderExt(this.placeholder()) : [];
   baselineExt = () => this.basicSetup() ? [basicSetupBundle] : [lineNumbers(), history(), keymap.of([...defaultKeymap, ...historyKeymap])];
   writeDoc = (v: any) => {
     if (!this.view) return;

packages/ui/codemirror/scripts/codegen.mjs

@@ -359,11 +359,15 @@ function main() {
     // SCOPE (SCOPE FENCE). As the sanctioned in-scope per-leaf type aid (the CM
     // analog of FullCalendar's `const opts` widening), annotate the three helper
     // arrows with an explicit `: any` return here in codegen GLUE — durable
-    // across regeneration, a pure type annotation (zero runtime change), and
-    // scoped to the Lit leaf (react/solid emit these helpers in a form that does
-    // not trip TS2742; vue/svelte/angular are type-neutral and never see it).
+    // across regeneration, a pure type annotation (zero runtime change). Applies
+    // to Lit AND Angular: both emit these helpers as `name = () =>` class fields
+    // (react/solid use a different form that doesn't trip TS2742, and have their
+    // own themeExt aid below). Angular's leaf now compiles via ng-packagr (real
+    // ngc/tsc) under the dist+source standard, so it sees these the same way Lit
+    // does — TS2742 on langExt (not nameable without @codemirror/language) and
+    // TS2345 on themeExt's `unknown` return. svelte stays type-neutral at build.
     // Tracked as an emitter follow-up (annotate hoisted engine-typed helpers).
-    if (cfg.dir === 'lit') {
+    if (cfg.dir === 'lit' || cfg.dir === 'angular') {
       let aided = 0;
       for (const name of ['langExt', 'themeExt', 'phExt']) {
         const token = `${name} = () =>`;
@@ -422,10 +426,12 @@ function main() {
     // (OUT OF SCOPE — SCOPE FENCE); as the sanctioned in-scope per-leaf aid (the
     // analog of the `themeExt`/`*Ext` annotations above), annotate `buildMarkers`'s
     // return `: any` here — a pure type annotation, zero runtime change. The emit
-    // shape is identical across the three bundled leaves; vue/svelte/angular are
-    // type-neutral and never see it. Only present when the `gutter` slot wires the
-    // marker builder, so this aid is gated on the token's presence.
-    if (cfg.dir === 'react' || cfg.dir === 'solid' || cfg.dir === 'lit') {
+    // shape (`const buildMarkers = (mView: any) =>`) is identical across the three
+    // bundled leaves AND the Angular leaf (now ngc/tsc-compiled under the
+    // dist+source standard, so it trips the same TS2322); vue/svelte stay
+    // type-neutral at build. Only present when the `gutter` slot wires the marker
+    // builder, so this aid is gated on the token's presence.
+    if (cfg.dir === 'react' || cfg.dir === 'solid' || cfg.dir === 'lit' || cfg.dir === 'angular') {
       const markersToken = 'const buildMarkers = (mView: any) =>';
       const markersAnnotated = 'const buildMarkers = (mView: any): any =>';
       if (!code.includes(markersToken)) {