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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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