fix(linker): link files whose ɵ identifiers are written as \u0275 escapes

crates/oxc_angular_compiler/src/linker/mod.rs

@@ -82,8 +82,9 @@ pub struct LinkResult {
 /// Scans the code for `ɵɵngDeclare*` calls and replaces them with their
 /// fully compiled equivalents.
 pub fn link(allocator: &Allocator, code: &str, filename: &str) -> LinkResult {
-    // Quick check: if no declarations, return early
-    if !code.contains("\u{0275}\u{0275}ngDeclare") {
+    // Quick check: if no declarations, return early. Match without the `ɵɵ` prefix because
+    // minifiers may write it as `\u0275` escapes; the AST below has them decoded.
+    if !code.contains("ngDeclare") {
         return LinkResult { code: code.to_string(), map: None, linked: false };
     }
 
@@ -4053,4 +4054,22 @@ MyDir.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "20.0.0
             result.code
         );
     }
+
+    #[test]
+    fn test_link_unicode_escaped_identifiers() {
+        // esbuild's default `--charset=ascii` writes `ɵ` in identifiers as `\u0275`.
+        let utf8 = r#"
+import * as e from "@angular/core";
+class Hi { static ɵfac = e.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "21.0.0", ngImport: e, type: Hi, deps: [], target: e.ɵɵFactoryTarget.Directive }); static ɵdir = e.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "21.0.0", type: Hi, isStandalone: true, selector: "[libHi]", inputs: { on: "on" }, host: { properties: { "class.on": "on" } }, ngImport: e }); }
+e.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "21.0.0", ngImport: e, type: Hi, decorators: [{ type: Directive, args: [{ selector: "[libHi]" }] }] });
+class Greet { static ɵcmp = e.ɵɵngDeclareComponent({ minVersion: "17.0.0", version: "21.0.0", type: Greet, isStandalone: true, selector: "lib-greet", ngImport: e, template: '<p [title]="name">Hello {{ name }}</p>' }); }
+"#;
+        let escaped = utf8.replace('\u{0275}', "\\u0275");
+        let allocator = Allocator::default();
+        let expected = link(&allocator, utf8, "test.mjs");
+        let result = link(&allocator, &escaped, "test.mjs");
+        assert!(expected.linked);
+        assert!(result.linked, "Escaped input should be linked, got:\n{}", result.code);
+        assert_eq!(result.code.replace("\\u0275", "\u{0275}"), expected.code);
+    }
 }

napi/angular-compiler/test/linker.test.ts

@@ -1,6 +1,7 @@
 import { describe, it, expect } from 'vitest'
 
 import { linkAngularPackageSync } from '../index.js'
+import { angularLinkerPlugin } from '../vite-plugin/angular-linker-plugin.js'
 
 /**
  * Minimal Angular partial declaration fixtures that simulate the structure
@@ -126,6 +127,20 @@ describe('Angular linker - chunk file linking', () => {
     expect(result.code).not.toContain('\u0275\u0275ngDeclare')
   })
 
+  it('should link through the Vite plugin when \u0275 is written as an escape', async () => {
+    // esbuild's default `--charset=ascii` minify writes `ɵ` in identifiers as `\u0275`.
+    const code = PIPE_CHUNK.replaceAll('\u0275', '\\u0275')
+    const plugin = angularLinkerPlugin() as any
+    const result = await plugin.transform.handler.call(
+      {},
+      code,
+      'node_modules/@angular/common/fesm2022/_pipes-chunk.mjs',
+    )
+
+    expect(result?.code).toContain('definePipe')
+    expect(result.code).not.toContain('ngDeclare')
+  })
+
   it('should return linked: false for files without declarations', () => {
     const code = `
       export function helper() { return 42; }

napi/angular-compiler/vite-plugin/angular-linker-plugin.ts

@@ -19,7 +19,8 @@ import type { Plugin } from 'vite'
  * 2. During Vite's transform pipeline for non-optimized node_modules files
  */
 
-const LINKER_DECLARATION_PREFIX = '\u0275\u0275ngDeclare'
+// No `ɵɵ` prefix: minifiers may write it as `\u0275` escapes.
+const LINKER_DECLARATION_PREFIX = 'ngDeclare'
 
 // Skip these packages - they don't need linking
 const SKIP_REGEX = /[\\/]@angular[\\/](?:compiler|core)[\\/]/