Linker emits duplicate _c0 constant names when component has both <ng-content> and host styles

[tomer953]

Description

The OXC Angular linker generates duplicate const _c0 declarations at module scope when linking a component that has both content projection (<ng-content>) and a host style binding (host: { '[style]': '...' }).

The standard Angular compiler uses incrementing names (_c0, _c1, _c2, …) for each generated constant. The OXC linker resets the counter, producing two const _c0 declarations in the same scope, which causes a parse error.

Minimal Reproduction

Given this partial-compilation .mjs file (simplified from @spartan-ng/brain):

import * as i0 from '@angular/core';
import { ChangeDetectionStrategy, Component } from '@angular/core';

class MyCheckbox {
  static ɵfac = i0.ɵɵngDeclareFactory({
    minVersion: "12.0.0", version: "19.2.8", ngImport: i0,
    type: MyCheckbox, deps: [], target: i0.ɵɵFactoryTarget.Component
  });
  static ɵcmp = i0.ɵɵngDeclareComponent({
    minVersion: "14.0.0", version: "19.2.8", ngImport: i0,
    type: MyCheckbox, isStandalone: true, selector: "my-checkbox",
    host: {
      properties: { "style": "{display: \"contents\"}" }
    },
    template: `<button><ng-content /></button>`,
    isInline: true,
    changeDetection: i0.ChangeDetectionStrategy.OnPush
  });
}

export { MyCheckbox };

Expected Output

The linker should produce unique constant names:

const _c0 = ["*"];                          // ng-content projection selectors
const _c1 = () => ({ display: "contents" }); // host style factory

// ... component definition using _c0 and _c1 respectively

Actual Output

const _c0 = ["*"];                          // ng-content projection selectors
// ...
}const _c0 = () => ({display:"contents"});  // ❌ DUPLICATE — same name!

Error

[PARSE_ERROR] Error: Identifier `_c0` has already been declared
     ╭─[input.mjs:X:7]
     │
   X │ const _c0 = ["*"];
     │       ─┬─
     │        ╰─── `_c0` has already been declared here
     │
   Y │ }const _c0 = () =>({display:"contents"});
     │        ─┬─
     │         ╰─── It can not be redeclared here
─────╯

https://github.com/spartan-ng/spartan/blob/main/libs/brain/checkbox/src/lib/brn-checkbox.ts

Workaround

Post-process the linker output to rename duplicate _cN constants: