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86 lines
2.9 KiB
86 lines
2.9 KiB
3 years ago
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[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url]
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[![Dependency Status][daviddm-image]][daviddm-url] [![devDependency Status][daviddm-dev-image]][daviddm-dev-url]
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# require-at
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Allow you to call `require` or `require.resolve` pretending that you are at another directory.
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## Purpose
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Given the directory structure below with two NodeJS apps:
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app1
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|-+ foo
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| +-- index.js
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| +--+ node_modules
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| +--+ x
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| + ...
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app2
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|-+ bar
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| +-- index.js
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| +--+ node_modules
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| +--+ y
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| + ...
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When you call `require("x")` in `/app1/foo/index.js`, NodeJS will search and find module `x` there.
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Now from the same file, if you want to resolve the module `y` under the directory `/app2/bar`, you have to use an absolute or relative path directly pointing to `y`, and you may have to do some searching, probably re-implementing Node's module searching algorithm if you don't know exactly where `y` could be.
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However, in the file `/app2/bar/index.js`, it can just do `require("y")` and Node would automatically find the module for it, because that file is at the location where `y` is under.
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What if from the file `/app1/foo/index.js`, you can call `require` as if you were at the directory `/app2/bar`, then you would be able to utilize Node's module searching automatically.
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To achieve this, most other implementations choose to re-implement Node's module searching algorithm.
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This module's approach is to tap into Node's `module` and let it do the work.
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## Install
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$ npm install require-at --save
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## Usage
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A single function is exported.
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##### `requireAt(dir, [request])`
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- If you call it with just `dir`, then it returns a `require` function that's been binded to the directory `dir`. You can use it to load any module as if you are at `dir`.
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- You can also call `require.resolve` with the same effect.
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- If you call it with `dir` and a `request`, then it will load and return the module `request` as if at `dir`.
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##### Example
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```js
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const requireAt = require("require-at");
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// get back a require binded to /another/dir
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const requireAtAnother = requireAt("/another/dir/");
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const modXPath = requireAtAnother.resolve("modX");
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const modX = requireAtAnother("modX");
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// load modY at /another/yet/dir directly
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const modY = requireAt("/another/yet/dir", "modY");
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```
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## License
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Apache-2.0 © [Joel Chen](https://github.com/jchip)
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[travis-image]: https://travis-ci.org/jchip/require-at.svg?branch=master
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[travis-url]: https://travis-ci.org/jchip/require-at
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[npm-image]: https://badge.fury.io/js/require-at.svg
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[npm-url]: https://npmjs.org/package/require-at
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[daviddm-image]: https://david-dm.org/jchip/require-at/status.svg
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[daviddm-url]: https://david-dm.org/jchip/require-at
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[daviddm-dev-image]: https://david-dm.org/jchip/require-at/dev-status.svg
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[daviddm-dev-url]: https://david-dm.org/jchip/require-at?type=dev
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