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lazy-req

lazy-req Build Status

Require modules lazily

Install

$ npm install --save lazy-req

Usage

// pass in `require` or a custom require function 
const lazyReq = require('lazy-req')(require);
const _ = lazyReq('lodash');
 
// Where you would normally do 
_.isNumber(2);
 
// You now instead call it as a function 
_().isNumber(2);
 
// It's cached on consecutive calls 
_().isString('unicorn');
 
// Extract lazy variations of the props you need 
const members = lazyReq('lodash')('isNumber', 'isString');
 
// Useful when using destructuring assignment in ES2015 
const {isNumber, isString} = lazyReq('lodash')('isNumber', 'isString');
 
// Works out of the box for functions and regular properties 
const stuff = lazyReq('./math-lib')('sum', 'PHI');
console.log(stuff.sum(1, 2)); // => 3 
console.log(stuff.PHI); // => 1.618033 

Proxy support in Node.js 6 or later

If you use Node.js 6 or later, you can take advantage of ES2015 proxies and don't need to call it as a function.

const lazyReq = require('lazy-req').proxy(require);
const _ = lazyReq('lodash');
 
// No need to call it as a function but still lazily required 
_.isNumber(2);

Related

  • resolve-from - Resolve the path of a module from a given path
  • req-from - Require a module from a given path
  • resolve-pkg - Resolve the path of a package regardless of it having an entry point
  • lazy-value - Create a lazily evaluated value
  • define-lazy-prop - Define a lazily evaluated property on an object

License

MIT © Sindre Sorhus