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readme.markdown
# 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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