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Showing content from https://github.com/browserify/resolve below:

browserify/resolve: Implements the node.js require.resolve() algorithm

implements the node require.resolve() algorithm such that you can require.resolve() on behalf of a file asynchronously and synchronously

asynchronously resolve:

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:

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

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)

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. a SyntaxError error argument will be ignored, all other error arguments will be treated as an error.

• 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 flag.

default opts values:

{
    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(jsonErr);
                }
            }
        });
    },
    moduleDirectory: 'node_modules',
    preserveSymlinks: false
}

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. a thrown SyntaxError will be ignored, all other exceptions will propagate.

  • readFileSync - the passed opts.readFileSync or fs.readFileSync if not specified
  • pkgfile - path to package.json

• 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 flag.

default opts values:

{
    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) {
        return JSON.parse(readFileSync(pkgfile));
    },
    moduleDirectory: 'node_modules',
    preserveSymlinks: false
}

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