fix(javascript): fix CJS require importing .js

packages/javascript/tsup.config.ts

@@ -15,5 +15,29 @@ const defaultOptions: Options = {
       options.packages = 'external';
     }
   },
+  plugins: [
+    {
+      // https://github.com/egoist/tsup/issues/953#issuecomment-2294998890
+      // ensuring that all local requires/imports in `.cjs` files import from `.cjs` files.
+      // require('./path') → require('./path.cjs') in `.cjs` files
+      // require('../path') → require('../path.cjs') in `.cjs` files
+      // from './path' → from './path.cjs' in `.cjs` files
+      // from '../path' → from '../path.cjs' in `.cjs` files
+      name: 'fix-cjs-imports',
+      renderChunk(code) {
+        if (this.format === 'cjs') {
+          const regexCjs = /require\((?<quote>['"])(?<import>\.[^'"]+)\.js['"]\)/g;
+          const regexDynamic = /import\((?<quote>['"])(?<import>\.[^'"]+)\.js['"]\)/g;
+          const regexEsm = /from(?<space>[\s]*)(?<quote>['"])(?<import>\.[^'"]+)\.js['"]/g;
+          return {
+            code: code
+              .replace(regexCjs, 'require($<quote>$<import>.cjs$<quote>)')
+              .replace(regexDynamic, 'import($<quote>$<import>.cjs$<quote>)')
+              .replace(regexEsm, 'from$<space>$<quote>$<import>.cjs$<quote>'),
+          };
+        }
+      },
+    },
+  ]
 };
 export default defaultOptions;