279 lines
10 KiB
Markdown
279 lines
10 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/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');
|
|
```
|
|
|
|
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 directory exists
|
|
|
|
* 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 for 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 directory exists
|
|
|
|
* 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 for 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
|