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# import-lazy [](https://travis-ci.org/sindresorhus/import-lazy) > Import modules lazily ## Install ``` $ npm install --save import-lazy ``` ## Usage ```js // Pass in `require` or a custom import function const importLazy = require('import-lazy')(require); const _ = importLazy('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 = importLazy('lodash')('isNumber', 'isString'); // Useful when using destructuring assignment in ES2015 const {isNumber, isString} = importLazy('lodash')('isNumber', 'isString'); // Works out of the box for functions and regular properties const stuff = importLazy('./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. ```js const importLazy = require('import-lazy').proxy(require); const _ = importLazy('lodash'); // No need to call it as a function but still lazily imported _.isNumber(2); ``` ## Related - [resolve-from](https://github.com/sindresorhus/resolve-from) - Resolve the path of a module from a given path - [import-from](https://github.com/sindresorhus/import-from) - Import a module from a given path - [resolve-pkg](https://github.com/sindresorhus/resolve-pkg) - Resolve the path of a package regardless of it having an entry point - [lazy-value](https://github.com/sindresorhus/lazy-value) - Create a lazily evaluated value - [define-lazy-prop](https://github.com/sindresorhus/define-lazy-prop) - Define a lazily evaluated property on an object ## License MIT © [Sindre Sorhus](https://sindresorhus.com)