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# 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 [![build status](https://secure.travis-ci.org/browserify/node-resolve.png)](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(pkg, pkgfile)` - transform the parsed package.json contents before looking at the "main" field * pkg - package data * pkgfile - path to 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.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'], 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); }); }, 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, 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) * 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'], 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(); }, moduleDirectory: 'node_modules', preserveSymlinks: true } ``` ## resolve.isCore(pkg) Return whether a package is in core. # install With [npm](https://npmjs.org) do: ```sh npm install resolve ``` # license MIT