fix: restore previous esm build to avoid dual-package hazard

Author: tpoisseau

package.json

@@ -20,16 +20,16 @@
     "matrix.js",
     "matrix.js.map",
     "matrix.mjs",
-    "matrix.mjs.map",
     "matrix.umd.js",
     "matrix.umd.js.map",
     "src"
   ],
   "scripts": {
+    "build-esm-facade": "node tools/build-esm-facade.mjs",
     "compile": "rollup -c",
     "eslint": "eslint src testUtils.js",
     "eslint-fix": "npm run eslint -- --fix",
-    "prepack": "npm run compile",
+    "prepack": "npm run compile && npm run build-esm-facade",
     "prettier": "prettier --check src",
     "prettier-write": "prettier --write src",
     "test": "npm run test-only && npm run eslint && npm run prettier",

rollup.config.mjs

@@ -13,16 +13,6 @@ export default [
     },
     plugins: [resolve()],
   },
-  {
-    input: 'src/index.js',
-    output: {
-      file: 'matrix.mjs',
-      format: 'esm',
-      exports: 'named',
-      sourcemap: true,
-    },
-    plugins: [resolve()],
-  },
   {
     input: 'src/index.js',
     output: {

tools/build-esm-facade.mjs

@@ -0,0 +1,20 @@
+import { writeFile } from 'node:fs/promises';
+
+import matrixBuild from '../matrix.js';
+
+const exportNames = Object.keys(matrixBuild);
+
+const exports = exportNames.map((name) => {
+  if (name === 'default') {
+    return `export default matrix.default.Matrix ? matrix.default.Matrix : matrix.Matrix;`;
+  }
+  return `export const ${name} = matrix.${name};`;
+});
+
+await writeFile(
+  new URL('../matrix.mjs', import.meta.url),
+  `import * as matrix from './matrix.js';
+
+${exports.join('\n')}
+`,
+);