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Editing: readme.md (1.91 KB)

# import-lazy [![Build Status](https://travis-ci.org/sindresorhus/import-lazy.svg?branch=master)](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)