var core = require('./core'); var fs = require('fs'); var path = require('path'); var caller = require('./caller.js'); var nodeModulesPaths = require('./node-modules-paths.js'); var normalizeOptions = require('./normalize-options.js'); var defaultIsFile = 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(); }; var defaultIsDir = 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(); }; var maybeUnwrapSymlink = function maybeUnwrapSymlink(x, opts) { if (opts && opts.preserveSymlinks === false) { try { return fs.realpathSync(x); } catch (realPathErr) { if (realPathErr.code !== 'ENOENT') { throw realPathErr; } } } return x; }; module.exports = function (x, options) { if (typeof x !== 'string') { throw new TypeError('Path must be a string.'); } var opts = normalizeOptions(x, options); var isFile = opts.isFile || defaultIsFile; var readFileSync = opts.readFileSync || fs.readFileSync; var isDirectory = opts.isDirectory || defaultIsDir; var extensions = opts.extensions || ['.js']; var basedir = opts.basedir || path.dirname(caller()); var parent = opts.filename || basedir; opts.paths = opts.paths || []; // ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory var absoluteStart = maybeUnwrapSymlink(path.resolve(basedir), opts); if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) { var res = path.resolve(absoluteStart, x); if (x === '..' || x.slice(-1) === '/') res += '/'; var m = loadAsFileSync(res) || loadAsDirectorySync(res); if (m) return maybeUnwrapSymlink(m, opts); } else if (core[x]) { return x; } else { var n = loadNodeModulesSync(x, absoluteStart); if (n) return maybeUnwrapSymlink(n, opts); } if (core[x]) return x; var err = new Error("Cannot find module '" + x + "' from '" + parent + "'"); err.code = 'MODULE_NOT_FOUND'; throw err; function loadAsFileSync(x) { var pkg = loadpkg(path.dirname(x)); if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) { var rfile = path.relative(pkg.dir, x); var r = opts.pathFilter(pkg.pkg, x, rfile); if (r) { x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign } } if (isFile(x)) { return x; } for (var i = 0; i < extensions.length; i++) { var file = x + extensions[i]; if (isFile(file)) { return file; } } } function loadpkg(dir) { if (dir === '' || dir === '/') return; if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) { return; } if ((/[/\\]node_modules[/\\]*$/).test(dir)) return; var pkgfile = path.join(dir, 'package.json'); if (!isFile(pkgfile)) { return loadpkg(path.dirname(dir)); } var body = readFileSync(pkgfile); try { var pkg = JSON.parse(body); } catch (jsonErr) {} if (pkg && opts.packageFilter) { pkg = opts.packageFilter(pkg, dir); } return { pkg: pkg, dir: dir }; } function loadAsDirectorySync(x) { var pkgfile = path.join(x, '/package.json'); if (isFile(pkgfile)) { try { var body = readFileSync(pkgfile, 'UTF8'); var pkg = JSON.parse(body); } catch (e) {} if (opts.packageFilter) { pkg = opts.packageFilter(pkg, x); } if (pkg.main) { if (typeof pkg.main !== 'string') { var mainError = new TypeError('package “' + pkg.name + '” `main` must be a string'); mainError.code = 'INVALID_PACKAGE_MAIN'; throw mainError; } if (pkg.main === '.' || pkg.main === './') { pkg.main = 'index'; } try { var m = loadAsFileSync(path.resolve(x, pkg.main)); if (m) return m; var n = loadAsDirectorySync(path.resolve(x, pkg.main)); if (n) return n; } catch (e) {} } } return loadAsFileSync(path.join(x, '/index')); } function loadNodeModulesSync(x, start) { var dirs = nodeModulesPaths(start, opts, x); for (var i = 0; i < dirs.length; i++) { var dir = dirs[i]; if (isDirectory(dir)) { var m = loadAsFileSync(path.join(dir, '/', x)); if (m) return m; var n = loadAsDirectorySync(path.join(dir, '/', x)); if (n) return n; } } } };