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Import a module lazily
$ npm install import-lazy
// Pass in `require` or a custom import function
const importLazy = require('import-lazy')(require);
const _ = importLazy('lodash');
// Instead of referring to its exported properties directly…
_.isNumber(2);
// …it's cached on consecutive calls
_.isNumber('unicorn');
// Works out of the box for functions and regular properties
const stuff = importLazy('./math-lib');
console.log(stuff.sum(1, 2)); // => 3
console.log(stuff.PHI); // => 1.618033
While you may be tempted to do leverage destructuring, like this:
const {isNumber, isString} = importLazy('lodash');
Note that this will cause immediate property access, negating the lazy loading, and is equivalent to:
import {isNumber, isString} from 'lodash';
MIT © Sindre Sorhus