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1# resolve
2
3implements the [node `require.resolve()`
4algorithm](https://nodejs.org/api/modules.html#modules_all_together)
5such that you can `require.resolve()` on behalf of a file asynchronously and
6synchronously
7
8[![build status](https://secure.travis-ci.org/browserify/resolve.png)](http://travis-ci.org/browserify/resolve)
9
10# example
11
12asynchronously resolve:
13
14```js
15var resolve = require('resolve');
16resolve('tap', { basedir: __dirname }, function (err, res) {
17 if (err) console.error(err);
18 else console.log(res);
19});
20```
21
22```
23$ node example/async.js
24/home/substack/projects/node-resolve/node_modules/tap/lib/main.js
25```
26
27synchronously resolve:
28
29```js
30var resolve = require('resolve');
31var res = resolve.sync('tap', { basedir: __dirname });
32console.log(res);
33```
34
35```
36$ node example/sync.js
37/home/substack/projects/node-resolve/node_modules/tap/lib/main.js
38```
39
40# methods
41
42```js
43var resolve = require('resolve');
44```
45
46For both the synchronous and asynchronous methods, errors may have any of the following `err.code` values:
47
48- `MODULE_NOT_FOUND`: the given path string (`id`) could not be resolved to a module
49- `INVALID_BASEDIR`: the specified `opts.basedir` doesn't exist, or is not a directory
50- `INVALID_PACKAGE_MAIN`: a `package.json` was encountered with an invalid `main` property (eg. not a string)
51
52## resolve(id, opts={}, cb)
53
54Asynchronously resolve the module path string `id` into `cb(err, res [, pkg])`, where `pkg` (if defined) is the data from `package.json`.
55
56options are:
57
58* opts.basedir - directory to begin resolving from
59
60* opts.package - `package.json` data applicable to the module being loaded
61
62* opts.extensions - array of file extensions to search in order
63
64* opts.includeCoreModules - set to `false` to exclude node core modules (e.g. `fs`) from the search
65
66* opts.readFile - how to read files asynchronously
67
68* opts.isFile - function to asynchronously test whether a file exists
69
70* opts.isDirectory - function to asynchronously test whether a directory exists
71
72* opts.realpath - function to asynchronously resolve a potential symlink to its real path
73
74* `opts.readPackage(readFile, pkgfile, cb)` - function to asynchronously read and parse a package.json file
75 * readFile - the passed `opts.readFile` or `fs.readFile` if not specified
76 * pkgfile - path to package.json
77 * cb - callback
78
79* `opts.packageFilter(pkg, pkgfile, dir)` - transform the parsed package.json contents before looking at the "main" field
80 * pkg - package data
81 * pkgfile - path to package.json
82 * dir - directory for package.json
83
84* `opts.pathFilter(pkg, path, relativePath)` - transform a path within a package
85 * pkg - package data
86 * path - the path being resolved
87 * relativePath - the path relative from the package.json location
88 * returns - a relative path that will be joined from the package.json location
89
90* opts.paths - require.paths array to use if nothing is found on the normal `node_modules` recursive walk (probably don't use this)
91
92 For advanced users, `paths` can also be a `opts.paths(request, start, opts)` function
93 * request - the import specifier being resolved
94 * start - lookup path
95 * getNodeModulesDirs - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
96 * opts - the resolution options
97
98* `opts.packageIterator(request, start, opts)` - return the list of candidate paths where the packages sources may be found (probably don't use this)
99 * request - the import specifier being resolved
100 * start - lookup path
101 * getPackageCandidates - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
102 * opts - the resolution options
103
104* opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`
105
106* opts.preserveSymlinks - if true, doesn't resolve `basedir` to real path before resolving.
107This is the way Node resolves dependencies when executed with the [--preserve-symlinks](https://nodejs.org/api/all.html#cli_preserve_symlinks) flag.
108**Note:** this property is currently `true` by default but it will be changed to
109`false` in the next major version because *Node's resolution algorithm does not preserve symlinks by default*.
110
111default `opts` values:
112
113```js
114{
115 paths: [],
116 basedir: __dirname,
117 extensions: ['.js'],
118 includeCoreModules: true,
119 readFile: fs.readFile,
120 isFile: function isFile(file, cb) {
121 fs.stat(file, function (err, stat) {
122 if (!err) {
123 return cb(null, stat.isFile() || stat.isFIFO());
124 }
125 if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
126 return cb(err);
127 });
128 },
129 isDirectory: function isDirectory(dir, cb) {
130 fs.stat(dir, function (err, stat) {
131 if (!err) {
132 return cb(null, stat.isDirectory());
133 }
134 if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
135 return cb(err);
136 });
137 },
138 realpath: function realpath(file, cb) {
139 var realpath = typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;
140 realpath(file, function (realPathErr, realPath) {
141 if (realPathErr && realPathErr.code !== 'ENOENT') cb(realPathErr);
142 else cb(null, realPathErr ? file : realPath);
143 });
144 },
145 readPackage: function defaultReadPackage(readFile, pkgfile, cb) {
146 readFile(pkgfile, function (readFileErr, body) {
147 if (readFileErr) cb(readFileErr);
148 else {
149 try {
150 var pkg = JSON.parse(body);
151 cb(null, pkg);
152 } catch (jsonErr) {
153 cb(null);
154 }
155 }
156 });
157 },
158 moduleDirectory: 'node_modules',
159 preserveSymlinks: true
160}
161```
162
163## resolve.sync(id, opts)
164
165Synchronously resolve the module path string `id`, returning the result and
166throwing an error when `id` can't be resolved.
167
168options are:
169
170* opts.basedir - directory to begin resolving from
171
172* opts.extensions - array of file extensions to search in order
173
174* opts.includeCoreModules - set to `false` to exclude node core modules (e.g. `fs`) from the search
175
176* opts.readFileSync - how to read files synchronously
177
178* opts.isFile - function to synchronously test whether a file exists
179
180* opts.isDirectory - function to synchronously test whether a directory exists
181
182* opts.realpathSync - function to synchronously resolve a potential symlink to its real path
183
184* `opts.readPackageSync(readFileSync, pkgfile)` - function to synchronously read and parse a package.json file
185 * readFileSync - the passed `opts.readFileSync` or `fs.readFileSync` if not specified
186 * pkgfile - path to package.json
187
188* `opts.packageFilter(pkg, dir)` - transform the parsed package.json contents before looking at the "main" field
189 * pkg - package data
190 * dir - directory for package.json (Note: the second argument will change to "pkgfile" in v2)
191
192* `opts.pathFilter(pkg, path, relativePath)` - transform a path within a package
193 * pkg - package data
194 * path - the path being resolved
195 * relativePath - the path relative from the package.json location
196 * returns - a relative path that will be joined from the package.json location
197
198* opts.paths - require.paths array to use if nothing is found on the normal `node_modules` recursive walk (probably don't use this)
199
200 For advanced users, `paths` can also be a `opts.paths(request, start, opts)` function
201 * request - the import specifier being resolved
202 * start - lookup path
203 * getNodeModulesDirs - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
204 * opts - the resolution options
205
206* `opts.packageIterator(request, start, opts)` - return the list of candidate paths where the packages sources may be found (probably don't use this)
207 * request - the import specifier being resolved
208 * start - lookup path
209 * getPackageCandidates - a thunk (no-argument function) that returns the paths using standard `node_modules` resolution
210 * opts - the resolution options
211
212* opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`
213
214* opts.preserveSymlinks - if true, doesn't resolve `basedir` to real path before resolving.
215This is the way Node resolves dependencies when executed with the [--preserve-symlinks](https://nodejs.org/api/all.html#cli_preserve_symlinks) flag.
216**Note:** this property is currently `true` by default but it will be changed to
217`false` in the next major version because *Node's resolution algorithm does not preserve symlinks by default*.
218
219default `opts` values:
220
221```js
222{
223 paths: [],
224 basedir: __dirname,
225 extensions: ['.js'],
226 includeCoreModules: true,
227 readFileSync: fs.readFileSync,
228 isFile: function isFile(file) {
229 try {
230 var stat = fs.statSync(file);
231 } catch (e) {
232 if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
233 throw e;
234 }
235 return stat.isFile() || stat.isFIFO();
236 },
237 isDirectory: function isDirectory(dir) {
238 try {
239 var stat = fs.statSync(dir);
240 } catch (e) {
241 if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
242 throw e;
243 }
244 return stat.isDirectory();
245 },
246 realpathSync: function realpathSync(file) {
247 try {
248 var realpath = typeof fs.realpathSync.native === 'function' ? fs.realpathSync.native : fs.realpathSync;
249 return realpath(file);
250 } catch (realPathErr) {
251 if (realPathErr.code !== 'ENOENT') {
252 throw realPathErr;
253 }
254 }
255 return file;
256 },
257 readPackageSync: function defaultReadPackageSync(readFileSync, pkgfile) {
258 var body = readFileSync(pkgfile);
259 try {
260 var pkg = JSON.parse(body);
261 return pkg;
262 } catch (jsonErr) {}
263 },
264 moduleDirectory: 'node_modules',
265 preserveSymlinks: true
266}
267```
268
269# install
270
271With [npm](https://npmjs.org) do:
272
273```sh
274npm install resolve
275```
276
277# license
278
279MIT
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