require-control

This is a module-in-the-middle, require hack, path control, this is just a toolbox to master nodejs modules.

• Fast relief againts the imports inside your node_modules.
• A cure from "something.default is not a thing".
• A way to tame module name resolution.

API

• All commands returns a function to cancel side effects.
• All commands could be run as many times as you wish, but only name resolution will make sense.

1. To cure all imports nodejs could look inside packages, stored out of sight of babel, inside node_modules

import 'require-control/register';

And then all imports inside node_modules will work

2. To make your project webpack-compact(babel interop require) by forcing .default to exist on exports

import 'require-control/interop-require';

And then default will always exists.

3. To create a loop-aware module cache

import {mirrorModuleCache} from 'require-control';
mirrorModuleCache((requireName, absoluteFilePath) => boolean);

And that will change how cache works for the selected files.

4. To control path resolution

import {nameResolution} from 'require-control';
nameResolution((requireName, parent) => newFileName);

import {setAliases} from 'require-control';
setAliases({
  'from': 'to'
});

And then all module aliases (webpack resolve, ts paths, aliases, anything)

PS: You can use setAliases to achieve 10-100 speedup against tsconfig-paths, if you are not using "complex" typescript paths.

PPS: setAlias is doing the same module-alias does - changes how Module._resolveFilename works. If you want to migrate to aliases from relative imports you might use relative-to-alias or restructor.

4.5 To control module resolution order

import {hoistExtensions} from 'require-control';

// make tsx, ts and jsx be picked first
hoistExtensions(['.tsx', '.ts', '.jsx']);

That could be quite usefull, if you have Component.less and Component.jsx or Component.tsx, as long as require('./Component') would load .less file - it goes before any other "non-native" extension.

PS: This command just moves listed extensions prior non-listed.

5. To apply any babel transformation, anywhere

babelIt(pick, babelSettings), where pick could return true, false, or code to pipe into babel.

import {babelIt} from 'require-control';

babelIt( fileName => fileName.includes('my-folder'), {
  babelrc: false,
  plugin: ['power-converter']
})

Examples

TypeScript + ES6 + Mocha

require('ts-node/register');  // support TS
require('babel-register');    // support ES

const { esm_modules, interopRequire, setAliases, resolutions } = require('require-control');

esm_modules();                // support ES in node_modules
interopRequire();             // "webpack" default imports everywhere in js,jsx,less,scss
interopRequire(['.less']);    // "webpack" default imports for .less files

setAliases({                  // why not!
  'common': path.join(root, 'src/common'),
  'components': path.join(root, 'src/components'),
});

resolutions(request => {      // custom resolution
  if (request === 'react') {
    return 'preact';
  }
});

Webpack aliases (or typescript paths)

const {setAliases } = require('require-control');

setAliases({                  
  'common': path.join(root, 'src/common'),
  'components': path.join(root, 'src/components'),
});

Would not be done without

This project would not be ever created without my work on rewiremock.

Licence

MIT