import { defineConfig } from 'vite';
import { resolve } from 'node:path';

// numbl is a local `file:` dependency, so node_modules/numbl is a symlink to
// the sibling checkout. Its package `exports` map only publishes the runtime
// entry points, not the compiler internals we need (parser + JIT lowering), so
// we reach them through a path alias — the same arrangement turing-surface
// uses, and documented there in src/mgpu/numbl.d.ts.
const numblSrc = resolve(import.meta.dirname, 'node_modules/numbl/src');

export default defineConfig({
  base: './',
  resolve: {
    alias: { 'numbl-src': numblSrc },
    // Without this, the dev server canonicalizes the symlink for SOME import
    // chains (`/@fs/<realpath>?v=...`) but not others (raw absolute paths),
    // which (a) trips the fs allow list and (b) loads numbl's builtin
    // registry twice — so the type-rule patches in src/mgpu/patches.ts land
    // on one instance while the lowerer consults the other. Keeping the
    // symlinked path everywhere gives every module one canonical URL.
    preserveSymlinks: true,
  },
  server: {
    // the alias resolves through the symlink; allow both spellings
    fs: { allow: [import.meta.dirname] },
  },
  build: {
    target: 'es2022',
    rollupOptions: {
      input: {
        main: resolve(import.meta.dirname, 'index.html'),
        test: resolve(import.meta.dirname, 'test.html'),
      },
    },
  },
});