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# resolve <sup>[![Version Badge][2]][1]</sup>

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

[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![dependency status][5]][6]
[![dev dependency status][7]][8]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][11]][1]

# example

asynchronously resolve:

```js
var resolve = require('resolve/async'); // or, 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/sync'); // or, `require('resolve').sync
var res = resolve('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');
var async = require('resolve/async');
var sync = require('resolve/sync');
```

For both the synchronous and asynchronous methods, errors may have any of the following `err.code` values:

- `MODULE_NOT_FOUND`: the given path string (`id`) could not be resolved to a module
- `INVALID_BASEDIR`: the specified `opts.basedir` doesn't exist, or is not a directory
- `INVALID_PACKAGE_MAIN`: a `package.json` was encountered with an invalid `main` property (eg. not a string)

## 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.includeCoreModules - set to `false` to exclude node core modules (e.g. `fs`) from the search

* opts.readFile - how to read files asynchronously

* opts.isFile - function to asynchronously test whether a file exists

* opts.isDirectory - function to asynchronously test whether a file exists and is a directory

* opts.realpath - function to asynchronously resolve a potential symlink to its real path

* `opts.readPackage(readFile, pkgfile, cb)` - function to asynchronously read and parse a package.json file
  * readFile - the passed `opts.readFile` or `fs.readFile` if not specified
  * pkgfile - path to package.json
  * cb - callback

* `opts.packageFilter(pkg, pkgfile, dir)` - transform the parsed package.json contents before looking at the "main" field
  * pkg - package data
  * pkgfile - path to package.json
  * dir - directory that contains package.json

* `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)

  For advanced users, `paths` can also be a `opts.paths(request, start, opts)` function
    * request - the import specifier being resolved
    * start - lookup path
    * getNodeModulesDirs - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
    * opts - the resolution options

* `opts.packageIterator(request, start, opts)` - return the list of candidate paths where the packages sources may be found (probably don't use this)
    * request - the import specifier being resolved
    * start - lookup path
    * getPackageCandidates - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
    * opts - the resolution options

* 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:

```js
{
    paths: [],
    basedir: __dirname,
    extensions: ['.js'],
    includeCoreModules: true,
    readFile: fs.readFile,
    isFile: function isFile(file, cb) {
        fs.stat(file, function (err, stat) {
            if (!err) {
                return cb(null, stat.isFile() || stat.isFIFO());
            }
            if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
            return cb(err);
        });
    },
    isDirectory: function isDirectory(dir, cb) {
        fs.stat(dir, function (err, stat) {
            if (!err) {
                return cb(null, stat.isDirectory());
            }
            if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
            return cb(err);
        });
    },
    realpath: function realpath(file, cb) {
        var realpath = typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;
        realpath(file, function (realPathErr, realPath) {
            if (realPathErr && realPathErr.code !== 'ENOENT') cb(realPathErr);
            else cb(null, realPathErr ? file : realPath);
        });
    },
    readPackage: function defaultReadPackage(readFile, pkgfile, cb) {
        readFile(pkgfile, function (readFileErr, body) {
            if (readFileErr) cb(readFileErr);
            else {
                try {
                    var pkg = JSON.parse(body);
                    cb(null, pkg);
                } catch (jsonErr) {
                    cb(null);
                }
            }
        });
    },
    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.includeCoreModules - set to `false` to exclude node core modules (e.g. `fs`) from the search

* opts.readFileSync - how to read files synchronously

* opts.isFile - function to synchronously test whether a file exists

* opts.isDirectory - function to synchronously test whether a file exists and is a directory

* opts.realpathSync - function to synchronously resolve a potential symlink to its real path

* `opts.readPackageSync(readFileSync, pkgfile)` - function to synchronously read and parse a package.json file
  * readFileSync - the passed `opts.readFileSync` or `fs.readFileSync` if not specified
  * pkgfile - path to package.json

* `opts.packageFilter(pkg, dir)` - transform the parsed package.json contents before looking at the "main" field
  * pkg - package data
  * dir - directory that contains package.json (Note: the second argument will change to "pkgfile" in v2)

* `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)

  For advanced users, `paths` can also be a `opts.paths(request, start, opts)` function
    * request - the import specifier being resolved
    * start - lookup path
    * getNodeModulesDirs - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
    * opts - the resolution options

* `opts.packageIterator(request, start, opts)` - return the list of candidate paths where the packages sources may be found (probably don't use this)
    * request - the import specifier being resolved
    * start - lookup path
    * getPackageCandidates - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
    * opts - the resolution options

* 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:

```js
{
    paths: [],
    basedir: __dirname,
    extensions: ['.js'],
    includeCoreModules: true,
    readFileSync: fs.readFileSync,
    isFile: function isFile(file) {
        try {
            var stat = fs.statSync(file);
        } catch (e) {
            if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
            throw e;
        }
        return stat.isFile() || stat.isFIFO();
    },
    isDirectory: function isDirectory(dir) {
        try {
            var stat = fs.statSync(dir);
        } catch (e) {
            if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
            throw e;
        }
        return stat.isDirectory();
    },
    realpathSync: function realpathSync(file) {
        try {
            var realpath = typeof fs.realpathSync.native === 'function' ? fs.realpathSync.native : fs.realpathSync;
            return realpath(file);
        } catch (realPathErr) {
            if (realPathErr.code !== 'ENOENT') {
                throw realPathErr;
            }
        }
        return file;
    },
    readPackageSync: function defaultReadPackageSync(readFileSync, pkgfile) {
        var body = readFileSync(pkgfile);
        try {
            var pkg = JSON.parse(body);
            return pkg;
        } catch (jsonErr) {}
    },
    moduleDirectory: 'node_modules',
    preserveSymlinks: true
}
```

# install

With [npm](https://npmjs.org) do:

```sh
npm install resolve
```

# license

MIT

[1]: https://npmjs.org/package/resolve
[2]: https://versionbadg.es/browserify/resolve.svg
[5]: https://david-dm.org/browserify/resolve.svg
[6]: https://david-dm.org/browserify/resolve
[7]: https://david-dm.org/browserify/resolve/dev-status.svg
[8]: https://david-dm.org/browserify/resolve#info=devDependencies
[11]: https://nodei.co/npm/resolve.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/resolve.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/resolve.svg
[downloads-url]: https://npm-stat.com/charts.html?package=resolve
[codecov-image]: https://codecov.io/gh/browserify/resolve/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/browserify/resolve/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/browserify/resolve
[actions-url]: https://github.com/browserify/resolve/actions
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