Commits on Nov 21, 2021

1. esm: add pjson.importInterop to support __esModule …

   Adds an option "importInterop" to package.json. When enabled, `import`
   statements in that package will behave slightly different with respect
   to default exports if the imported module is CJS.
   
   - When the imported module defines `module.exports.__esModule` as a
     truthy value, the value of `module.exports.default` is used as the
     default export.
   - Otherwise, `module.exports` is used as the default export.
     (existing behavior)
   
   It allows better interoperation between full ES modules and CJS modules
   transformed from ES modules by Babel or tsc. Consider the following
   example:
   
   ```javascript
   // Transformed from:
   // export default "Hello";
   Object.defineProperty(module.exports, "__esModule", { value: true });
   module.exports.default = "Hello";
   ```
   
   When imported from the following module:
   
   ```javascript
   import greeting from "./hello.cjs";
   console.log(greeting);
   ```
   
   with the following package.json:
   
   ```javascript
   {
     "type": "module",
     "importInterop": true
   }
   ```
   
   Then it will print "Hello".
   
   Fixes: nodejs#40891

   

   qnighy committed Nov 21, 2021
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