160 lines
4.5 KiB
Markdown
160 lines
4.5 KiB
Markdown
# resolve
|
|
|
|
implements the [node `require.resolve()`
|
|
algorithm](https://nodejs.org/api/modules.html#modules_all_together)
|
|
such that you can `require.resolve()` on behalf of a file asynchronously and
|
|
synchronously
|
|
|
|
[](http://travis-ci.org/browserify/node-resolve)
|
|
|
|
# example
|
|
|
|
asynchronously resolve:
|
|
|
|
``` js
|
|
var resolve = require('resolve');
|
|
resolve('tap', { basedir: __dirname }, function (err, res) {
|
|
if (err) console.error(err)
|
|
else console.log(res)
|
|
});
|
|
```
|
|
|
|
```
|
|
$ node example/async.js
|
|
/home/substack/projects/node-resolve/node_modules/tap/lib/main.js
|
|
```
|
|
|
|
synchronously resolve:
|
|
|
|
``` js
|
|
var resolve = require('resolve');
|
|
var res = resolve.sync('tap', { basedir: __dirname });
|
|
console.log(res);
|
|
```
|
|
|
|
```
|
|
$ node example/sync.js
|
|
/home/substack/projects/node-resolve/node_modules/tap/lib/main.js
|
|
```
|
|
|
|
# methods
|
|
|
|
``` js
|
|
var resolve = require('resolve')
|
|
```
|
|
|
|
## resolve(id, opts={}, cb)
|
|
|
|
Asynchronously resolve the module path string `id` into `cb(err, res [, pkg])`, where `pkg` (if defined) is the data from `package.json`.
|
|
|
|
options are:
|
|
|
|
* opts.basedir - directory to begin resolving from
|
|
|
|
* opts.package - `package.json` data applicable to the module being loaded
|
|
|
|
* opts.extensions - array of file extensions to search in order
|
|
|
|
* opts.readFile - how to read files asynchronously
|
|
|
|
* opts.isFile - function to asynchronously test whether a file exists
|
|
|
|
* opts.packageFilter - transform the parsed package.json contents before looking
|
|
at the "main" field
|
|
|
|
* opts.pathFilter(pkg, path, relativePath) - transform a path within a package
|
|
* pkg - package data
|
|
* path - the path being resolved
|
|
* relativePath - the path relative from the package.json location
|
|
* returns - a relative path that will be joined from the package.json location
|
|
|
|
* opts.paths - require.paths array to use if nothing is found on the normal
|
|
node_modules recursive walk (probably don't use this)
|
|
|
|
* opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`
|
|
|
|
* opts.preserveSymlinks - if true, doesn't resolve `basedir` to real path before resolving.
|
|
This is the way Node resolves dependencies when executed with the [--preserve-symlinks](https://nodejs.org/api/all.html#cli_preserve_symlinks) flag.
|
|
**Note:** this property is currently `true` by default but it will be changed to
|
|
`false` in the next major version because *Node's resolution algorithm does not preserve symlinks by default*.
|
|
|
|
default `opts` values:
|
|
|
|
``` javascript
|
|
{
|
|
paths: [],
|
|
basedir: __dirname,
|
|
extensions: [ '.js' ],
|
|
readFile: fs.readFile,
|
|
isFile: function (file, cb) {
|
|
fs.stat(file, function (err, stat) {
|
|
if (err && err.code === 'ENOENT') cb(null, false)
|
|
else if (err) cb(err)
|
|
else cb(null, stat.isFile())
|
|
});
|
|
},
|
|
moduleDirectory: 'node_modules',
|
|
preserveSymlinks: true
|
|
}
|
|
```
|
|
|
|
## resolve.sync(id, opts)
|
|
|
|
Synchronously resolve the module path string `id`, returning the result and
|
|
throwing an error when `id` can't be resolved.
|
|
|
|
options are:
|
|
|
|
* opts.basedir - directory to begin resolving from
|
|
|
|
* opts.extensions - array of file extensions to search in order
|
|
|
|
* opts.readFile - how to read files synchronously
|
|
|
|
* opts.isFile - function to synchronously test whether a file exists
|
|
|
|
* `opts.packageFilter(pkg, pkgfile)` - transform the parsed package.json
|
|
* contents before looking at the "main" field
|
|
|
|
* opts.paths - require.paths array to use if nothing is found on the normal
|
|
node_modules recursive walk (probably don't use this)
|
|
|
|
* opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`
|
|
|
|
* opts.preserveSymlinks - if true, doesn't resolve `basedir` to real path before resolving.
|
|
This is the way Node resolves dependencies when executed with the [--preserve-symlinks](https://nodejs.org/api/all.html#cli_preserve_symlinks) flag.
|
|
**Note:** this property is currently `true` by default but it will be changed to
|
|
`false` in the next major version because *Node's resolution algorithm does not preserve symlinks by default*.
|
|
|
|
default `opts` values:
|
|
|
|
``` javascript
|
|
{
|
|
paths: [],
|
|
basedir: __dirname,
|
|
extensions: [ '.js' ],
|
|
readFileSync: fs.readFileSync,
|
|
isFile: function (file) {
|
|
try { return fs.statSync(file).isFile() }
|
|
catch (e) { return false }
|
|
},
|
|
moduleDirectory: 'node_modules',
|
|
preserveSymlinks: true
|
|
}
|
|
````
|
|
|
|
## resolve.isCore(pkg)
|
|
|
|
Return whether a package is in core.
|
|
|
|
# install
|
|
|
|
With [npm](https://npmjs.org) do:
|
|
|
|
```
|
|
npm install resolve
|
|
```
|
|
|
|
# license
|
|
|
|
MIT
|