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resolve

resolve like require.resolve() on behalf of files asynchronously and synchronously

1.12.0  •  Updated 8 months ago  •  by browserify  •  MIT License

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

build status

example

asynchronously resolve:

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:

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

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.isDirectory - function to asynchronously test whether a directory 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 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:

{
    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);
        });
    },
    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);
        });
    },
    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.isDirectory - function to synchronously test whether a directory 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 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:

{
    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();
    },
    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();
    },
    moduleDirectory: 'node_modules',
    preserveSymlinks: true
}

resolve.isCore(pkg)

Return whether a package is in core.

install

With npm do:

npm install resolve

license

MIT

Popularity

Weekly Downloads
20.1M
Stars
552

Maintenance

Development

Last ver 8 months ago
Created 9 years ago
Last commit 4 months ago
8 days between commits

Technology

Node version: 12.7.0
99.5K unpacked

Compliance

MIT License
OSI Approved
0 vulnerabilities

Contributors

52 contributors
Jordan Harband
Maintainer, 197 commits, 31 merges, 3 PRs
James Halliday
116 commits, 17 merges
Works at bits.coop
Forbes Lindesay
10 commits
Jesse McCarthy
5 commits, 2 PRs
Justin Searls
5 commits, 1 PRs
Works at testdouble
Jared Hanson
4 commits, 2 PRs

Tags

resolve
require
node
module
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