Fix cjs build after switch to esbuild

.gitignore

@@ -1,3 +1,4 @@
 node_modules
-main.ts
-dist
+/main.ts
+dist
+/index.js

pinefile.js

@@ -1,15 +1,34 @@
-const isCI = require('is-ci');
-const { run, log, series } = require('@pinefile/pine');
-const { build } = require('esbuild');
+import { run, log, series } from '@pinefile/pine';
+import isCI from 'is-ci';
+import { build as esbuild } from 'esbuild';
+import fs from 'fs';
 
 const buildOptions = (format) => ({
   entryPoints: ['./src/index.ts'],
   bundle: true,
   format,
   outfile: `./dist/${format}/index.js`,
+  write: false,
 });
 
-module.exports = {
+const build = async (options) => {
+  fs.mkdirSync(`./dist/${options.format}`);
+
+  const result = await esbuild(options);
+
+  for (let out of result.outputFiles) {
+    fs.writeFileSync(
+      out.path,
+      options.format === 'cjs'
+        ? // fixes personnummer#468
+          out.text.replace('module.exports = __toCommonJS(src_exports);', '') +
+            'module.exports = src_default2;'
+        : out.text
+    );
+  }
+};
+
+export default {
   build: async () => {
     await run('rimraf dist');
 

test.ts

@@ -1,6 +1,7 @@
-const Personnummer = require('personnummer').default;
 const lib = require(process.env.FILE);
-const Organisationsnummer = lib.default ? lib.default : lib;
+const Organisationsnummer = process.env.FILE?.includes('esm')
+  ? lib.default
+  : lib;
 
 it('should validate valid organization numbers', () => {
   const numbers = ['556016-0680', '556103-4249', '5561034249', '559244-0001'];