node-hook

Run source transform function on Node require

Install and use

 npm install --save node-hook

Before loading desired .js files, install hook

 var hook = require('node-hook');

function logLoadedFilename(source, filename) {
    return 'console.log("' + filename + '");\n' + source;
}
hook.hook('.js', logLoadedFilename);
require('./dummy');
// prints fulle dummy.js filename, runs dummy.js

hook.unhook('.js'); // removes your own transform

remember: Nodejs caches compiled modules, so if the transform is not
working, you might need to delete the cached entry in require.cache,
then call require(filename) again to force reload.

Related: Node require replacement really-need.

You can hook several transformers thanks to the code
submitted by djulien

Existing transform

You can get the current transform and run any source through it. For example
to see how the current source looks when loaded but before evaluated

 const filename = resolve('./call-foo.js')
const transform = Module._extensions['.js']
const fakeModule = {
  _compile: source => {
    console.log('transformed code')
    console.log(source)
  }
}
transform(fakeModule, filename)

Small print

Author: Gleb Bahmutov © 2013

• Changelog
• @bahmutov
• glebbahmutov.com
• blog

License: MIT - do anything with the code,
but don't blame me if it does not work.

Support: if you find any problems with this module, email / tweet / open issue on Github