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var fs = require('fs');
var getHomedir = require('./homedir');
var path = require('path');
var caller = require('./caller');
var nodeModulesPaths = require('./node-modules-paths');
var normalizeOptions = require('./normalize-options');
var isCore = require('is-core-module');
var $Error = require('es-errors');
var $TypeError = require('es-errors/type');
var getCategoryInfo = require('node-exports-info/getCategoryInfo');
var getCategoriesForRange = require('node-exports-info/getCategoriesForRange');
var resolveExports = require('./exports-resolve');
var parsePackageSpecifier = require('./parse-package-specifier');
var getExportsCategory = require('./get-exports-category');
var selectMostRestrictive = require('./select-most-restrictive');
var realpathFS = process.platform !== 'win32' && fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;
var relativePathRegex = /^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/;
var windowsDriveRegex = /^\w:[/\\]*$/;
var nodeModulesRegex = /[/\\]node_modules[/\\]*$/;
var homedir = getHomedir();
function defaultPaths() {
if (!homedir) return [];
return [
path.join(homedir, '.node_modules'),
path.join(homedir, '.node_libraries')
];
}
var defaultIsFile = 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);
});
};
var defaultIsDir = 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);
});
};
var defaultRealpath = function realpath(x, cb) {
realpathFS(x, function (realpathErr, realPath) {
if (realpathErr && realpathErr.code !== 'ENOENT') cb(realpathErr);
else cb(null, realpathErr ? x : realPath);
});
};
function maybeRealpath(realpath, x, opts, cb) {
if (!opts || !opts.preserveSymlinks) {
realpath(x, cb);
} else {
cb(null, x);
}
}
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);
}
}
});
}
function getPackageCandidates(x, start, opts) {
var dirs = nodeModulesPaths(start, opts, x);
for (var i = 0; i < dirs.length; i++) {
dirs[i] = path.join(dirs[i], x);
}
return dirs;
}
function findUpConsumer(currentDir, isFile, readPackage, readFile, done) {
var pkgfile = path.join(currentDir, 'package.json');
isFile(pkgfile, function (err, exists) {
if (err) { return done(err); }
if (exists) {
readPackage(readFile, pkgfile, function (readErr, pkg) {
if (readErr && !(readErr instanceof SyntaxError)) { return done(readErr); }
done(null, pkg || null);
});
} else {
var parentDir = path.dirname(currentDir);
if (parentDir === currentDir) {
return done(null, null);
}
findUpConsumer(parentDir, isFile, readPackage, readFile, done);
}
});
}
function findConsumerPackage(startDir, isFile, readPackage, readFile, done) {
var dir = path.resolve(startDir);
findUpConsumer(dir, isFile, readPackage, readFile, done);
}
function findUpWithDir(currentDir, isFile, readPackage, readFile, done) {
// Stop at node_modules boundaries - can't self-reference across node_modules
if (nodeModulesRegex.test(currentDir)) {
return done(null, null);
}
var pkgfile = path.join(currentDir, 'package.json');
isFile(pkgfile, function (err, exists) {
if (err) { return done(err); }
if (exists) {
readPackage(readFile, pkgfile, function (readErr, pkg) {
if (readErr && !(readErr instanceof SyntaxError)) { return done(readErr); }
done(null, pkg ? {
__proto__: null, pkg: pkg, dir: currentDir
} : null);
});
} else {
var parentDir = path.dirname(currentDir);
if (parentDir === currentDir) {
return done(null, null);
}
findUpWithDir(parentDir, isFile, readPackage, readFile, done);
}
});
}
module.exports = function resolve(x, options, callback) {
var cb = callback;
var opts = options;
if (typeof options === 'function') {
cb = opts;
opts = {};
}
if (typeof x !== 'string') {
var err = new $TypeError('Path must be a string.');
return process.nextTick(function () {
cb(err);
});
}
opts = normalizeOptions(x, opts);
var isFile = opts.isFile || defaultIsFile;
var isDirectory = opts.isDirectory || defaultIsDir;
var readFile = opts.readFile || fs.readFile;
var realpath = opts.realpath || defaultRealpath;
var readPackage = opts.readPackage || defaultReadPackage;
if (opts.readFile && opts.readPackage) {
var conflictErr = new $TypeError('`readFile` and `readPackage` are mutually exclusive.');
return process.nextTick(function () {
cb(conflictErr);
});
}
var packageIterator = opts.packageIterator;
if (typeof opts.moduleSystem !== 'undefined' && opts.moduleSystem !== 'require' && opts.moduleSystem !== 'import') {
var msErr = new $TypeError('`moduleSystem` must be `\'require\'` or `\'import\'`.');
return process.nextTick(function () {
cb(msErr);
});
}
var extensions = opts.extensions || ['.js'];
var includeCoreModules = opts.includeCoreModules !== false;
var basedir = opts.basedir || path.dirname(caller());
var parent = opts.filename || basedir;
opts.paths = opts.paths || defaultPaths();
// Determine exports category
var exportsCategory;
// hoist the caught error into a `var` rather than closing over the catch binding;
// old V8 (node < 4) drops the catch param when the inner closure is rewritten by nyc.
var catErr;
try {
exportsCategory = getExportsCategory(opts);
} catch (e) {
catErr = e;
}
if (catErr) {
return process.nextTick(function () {
cb(catErr);
});
}
// ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory
var absoluteStart = path.resolve(basedir);
maybeRealpath(
realpath,
absoluteStart,
opts,
function (err, realStart) {
if (err) cb(err);
else if (exportsCategory === 'engines') {
// Need to read consumer's package.json for engines.node
findConsumerPackage(realStart, isFile, readPackage, readFile, function (findErr, consumerPkg) {
if (findErr) return cb(findErr);
if (consumerPkg && consumerPkg.engines && consumerPkg.engines.node) {
var categories = getCategoriesForRange(consumerPkg.engines.node);
exportsCategory = selectMostRestrictive(categories);
} else {
exportsCategory = null;
}
validateBasedir(realStart);
});
} else {
validateBasedir(realStart);
}
}
);
function findPackageWithDir(startDir, done) {
var dir = path.resolve(startDir);
findUpWithDir(dir, isFile, readPackage, readFile, done);
}
function resolveSelfReference(x, startDir, done) {
var parsed = parsePackageSpecifier(x);
findPackageWithDir(startDir, function (err, pkgInfo) {
if (err) return done(err);
if (!pkgInfo || !pkgInfo.pkg || pkgInfo.pkg.name !== parsed.name) {
return done(null, null); // Not a self-reference
}
var pkg = pkgInfo.pkg;
var pkgDir = pkgInfo.dir;
if (opts.packageFilter) {
pkg = opts.packageFilter(pkg, path.join(pkgDir, 'package.json'), pkgDir);
}
// If package has exports field, resolve via exports
if (typeof pkg.exports !== 'undefined') {
var categoryInfo = getCategoryInfo(exportsCategory, opts.moduleSystem || 'require');
var conditions = opts.conditions || categoryInfo.conditions;
var resolved;
try {
resolved = resolveExports(pkg.exports, parsed.subpath, conditions, categoryInfo.flags);
} catch (exportsErr) {
return done(exportsErr);
}
if (resolved) {
var resolvedPath = path.resolve(pkgDir, resolved);
isFile(resolvedPath, function (err, exists) {
if (err) return done(err);
if (exists) return done(null, resolvedPath, pkg);
// File doesn't exist
done(null, undefined);
});
return;
}
// exports field exists but didn't resolve
return done(null, undefined);
}
// No exports field - fall back to traditional resolution for self-reference
if (parsed.subpath === '.') {
loadAsDirectory(pkgDir, pkg, function (err, result, resultPkg) {
done(err, result, resultPkg);
});
} else {
var subPath = path.join(pkgDir, parsed.subpath.slice(1));
loadAsFile(subPath, pkg, function (err, m, mPkg) {
if (err) return done(err);
if (m) return done(null, m, mPkg);
loadAsDirectory(subPath, pkg, function (err, n, nPkg) {
done(err, n, nPkg);
});
});
}
});
}
function validateBasedir(basedir) {
if (opts.basedir) {
var dirError = new $TypeError('Provided basedir "' + basedir + '" is not a directory' + (opts.preserveSymlinks ? '' : ', or a symlink to a directory'));
dirError.code = 'INVALID_BASEDIR';
isDirectory(basedir, function (err, result) {
if (err) return cb(err);
if (!result) { return cb(dirError); }
validBasedir(basedir);
});
} else {
validBasedir(basedir);
}
}
var useExports = false;
var res;
function validBasedir(basedir) {
useExports = exportsCategory !== null && exportsCategory !== 'pre-exports';
if (relativePathRegex.test(x)) {
res = path.resolve(basedir, x);
if (x === '.' || x === '..' || x.slice(-1) === '/') res += '/';
if (x.slice(-1) === '/' && res === basedir) {
loadAsDirectory(res, opts.package, onfile);
} else loadAsFile(res, opts.package, onfile);
} else if (includeCoreModules && isCore(x)) {
return cb(null, x);
} else if (useExports) {
// Try self-reference resolution first
resolveSelfReference(x, basedir, function (selfErr, selfRef, selfPkg) {
if (selfErr) return cb(selfErr);
if (selfRef) {
return maybeRealpath(realpath, selfRef, opts, function (err, realSelf) {
if (err) cb(err);
else cb(null, realSelf, selfPkg);
});
}
if (selfRef === undefined) {
// exports field exists but didn't resolve - error per Node semantics
var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");
moduleError.code = 'MODULE_NOT_FOUND';
return cb(moduleError);
}
loadNodeModulesWithExports(x, basedir, function (err, n, pkg) {
if (err) cb(err);
else if (n) {
return maybeRealpath(realpath, n, opts, function (err, realN) {
if (err) {
cb(err);
} else {
cb(null, realN, pkg);
}
});
} else {
var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");
moduleError.code = 'MODULE_NOT_FOUND';
cb(moduleError);
}
});
});
} else {
loadNodeModules(x, basedir, function (err, n, pkg) {
if (err) cb(err);
else if (n) {
return maybeRealpath(realpath, n, opts, function (err, realN) {
if (err) {
cb(err);
} else {
cb(null, realN, pkg);
}
});
} else {
var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");
moduleError.code = 'MODULE_NOT_FOUND';
cb(moduleError);
}
});
}
}
function onfile(err, m, pkg) {
if (err) cb(err);
else if (m) cb(null, m, pkg);
else loadAsDirectory(res, function (err, d, pkg) {
if (err) cb(err);
else if (d) {
maybeRealpath(realpath, d, opts, function (err, realD) {
if (err) {
cb(err);
} else {
cb(null, realD, pkg);
}
});
} else {
var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");
moduleError.code = 'MODULE_NOT_FOUND';
cb(moduleError);
}
});
}
function loadAsFile(x, thePackage, callback) {
var loadAsFilePackage = thePackage;
var cb = callback;
if (typeof loadAsFilePackage === 'function') {
cb = loadAsFilePackage;
loadAsFilePackage = undefined;
}
var exts = [''].concat(extensions);
load(exts, x, loadAsFilePackage);
function load(exts, x, loadPackage) {
if (exts.length === 0) return cb(null, undefined, loadPackage);
var file = x + exts[0];
var pkg = loadPackage;
if (pkg) onpkg(null, pkg);
else loadpkg(path.dirname(file), onpkg);
function onpkg(err, pkg_, dir) {
pkg = pkg_;
if (err) return cb(err);
if (dir && pkg && opts.pathFilter) {
var rfile = path.relative(dir, file);
var rel = rfile.slice(0, rfile.length - exts[0].length);
var r = opts.pathFilter(pkg, x, rel);
if (r) return load(
[''].concat(extensions),
path.resolve(dir, r),
pkg
);
}
isFile(file, onex);
}
function onex(err, ex) {
if (err) return cb(err);
if (ex) return cb(null, file, pkg);
load(exts.slice(1), x, pkg);
}
}
}
function loadpkg(dir, cb) {
if (dir === '' || dir === '/') return cb(null);
if (process.platform === 'win32' && windowsDriveRegex.test(dir)) {
return cb(null);
}
if (nodeModulesRegex.test(dir)) return cb(null);
maybeRealpath(realpath, dir, opts, function (unwrapErr, pkgdir) {
if (unwrapErr) return loadpkg(path.dirname(dir), cb);
var pkgfile = path.join(pkgdir, 'package.json');
isFile(pkgfile, function (err, ex) {
// on err, ex is false
if (!ex) return loadpkg(path.dirname(dir), cb);
readPackage(readFile, pkgfile, function (err, pkgParam) {
if (err && !(err instanceof SyntaxError)) return cb(err);
var pkg = pkgParam;
if (pkg && opts.packageFilter) {
pkg = opts.packageFilter(pkg, pkgfile, dir);
}
cb(null, pkg, dir);
});
});
});
}
function loadAsDirectory(x, loadAsDirectoryPackage, callback) {
var cb = callback;
var fpkg = loadAsDirectoryPackage;
if (typeof fpkg === 'function') {
cb = fpkg;
fpkg = opts.package;
}
maybeRealpath(realpath, x, opts, function (unwrapErr, pkgdir) {
if (unwrapErr) return loadAsDirectory(path.dirname(x), fpkg, cb);
var pkgfile = path.join(pkgdir, 'package.json');
isFile(pkgfile, function (err, ex) {
if (err) return cb(err);
if (!ex) return loadAsFile(path.join(x, 'index'), fpkg, cb);
readPackage(readFile, pkgfile, function (err, pkgParam) {
if (err) return cb(err);
var pkg = pkgParam;
if (pkg && opts.packageFilter) {
pkg = opts.packageFilter(pkg, pkgfile, pkgdir);
}
if (pkg && pkg.main) {
if (typeof pkg.main !== 'string') {
var mainError = new $TypeError('package “' + pkg.name + '” `main` must be a string');
mainError.code = 'INVALID_PACKAGE_MAIN';
return cb(mainError);
}
if (pkg.main === '.' || pkg.main === './') {
pkg.main = 'index';
}
loadAsFile(path.resolve(x, pkg.main), pkg, function (err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
if (!pkg) return loadAsFile(path.join(x, 'index'), pkg, cb);
var dir = path.resolve(x, pkg.main);
loadAsDirectory(dir, pkg, function (err, n, pkg) {
if (err) return cb(err);
if (n) return cb(null, n, pkg);
loadAsFile(path.join(x, 'index'), pkg, function (err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
var incorrectMainError = new $Error("Cannot find module '" + path.resolve(x, pkg.main) + "'. Please verify that the package.json has a valid \"main\" entry");
incorrectMainError.code = 'INCORRECT_PACKAGE_MAIN';
return cb(incorrectMainError);
});
});
});
return;
}
loadAsFile(path.join(x, '/index'), pkg, cb);
});
});
});
}
function processDirs(cb, dirs) {
if (dirs.length === 0) return cb(null, undefined);
var dir = dirs[0];
isDirectory(path.dirname(dir), isdir);
function isdir(err, isdir) {
if (err) return cb(err);
if (!isdir) return processDirs(cb, dirs.slice(1));
loadAsFile(dir, opts.package, onfile);
}
function onfile(err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
loadAsDirectory(dir, opts.package, ondir);
}
function ondir(err, n, pkg) {
if (err) return cb(err);
if (n) return cb(null, n, pkg);
processDirs(cb, dirs.slice(1));
}
}
function loadNodeModules(x, start, cb) {
var thunk = function () { return getPackageCandidates(x, start, opts); };
processDirs(
cb,
packageIterator ? packageIterator(x, start, thunk, opts) : thunk()
);
}
function loadNodeModulesWithExports(x, start, done) {
var parsed = parsePackageSpecifier(x);
var categoryInfo = getCategoryInfo(exportsCategory, opts.moduleSystem || 'require');
var conditions = opts.conditions || categoryInfo.conditions;
var thunk = function () { return getPackageCandidates(parsed.name, start, opts); };
var dirs = packageIterator ? packageIterator(parsed.name, start, thunk, opts) : thunk();
processExportsDirs(dirs, 0);
function processExportsDirs(dirs, idx) {
if (idx >= dirs.length) return done(null, undefined);
var pkgDir = dirs[idx];
isDirectory(pkgDir, function (err, isDir) {
if (err) return done(err);
if (!isDir) return processExportsDirs(dirs, idx + 1);
var pkgfile = path.join(pkgDir, 'package.json');
isFile(pkgfile, function (err, exists) {
if (err) return done(err);
if (!exists) {
// No package.json, fall back to file/directory resolution
if (parsed.subpath === '.') {
loadAsFile(pkgDir, opts.package, function (err, m, pkg) {
if (err) return done(err);
if (m) return done(null, m, pkg);
loadAsDirectory(pkgDir, opts.package, function (err, n, pkg) {
if (err) return done(err);
if (n) return done(null, n, pkg);
processExportsDirs(dirs, idx + 1);
});
});
} else {
var fullPath = path.join(pkgDir, parsed.subpath.slice(1));
loadAsFile(fullPath, opts.package, function (err, m, pkg) {
if (err) return done(err);
if (m) return done(null, m, pkg);
loadAsDirectory(fullPath, opts.package, function (err, n, pkg) {
if (err) return done(err);
if (n) return done(null, n, pkg);
processExportsDirs(dirs, idx + 1);
});
});
}
return;
}
readPackage(readFile, pkgfile, function (err, pkg) {
if (err) {
if (!(err instanceof SyntaxError)) return done(err);
return processExportsDirs(dirs, idx + 1);
}
if (pkg && opts.packageFilter) {
// eslint-disable-next-line no-param-reassign
pkg = opts.packageFilter(pkg, pkgfile, pkgDir);
}
// If package has exports field, use exports resolution
if (pkg && typeof pkg.exports !== 'undefined') {
var resolved;
try {
resolved = resolveExports(pkg.exports, parsed.subpath, conditions, categoryInfo.flags);
} catch (exportsErr) {
return done(exportsErr);
}
if (resolved) {
var resolvedPath = path.resolve(pkgDir, resolved);
isFile(resolvedPath, function (err, exists) {
if (err) return done(err);
if (exists) return done(null, resolvedPath, pkg);
// File doesn't exist
done(null, undefined);
});
return;
}
// exports field exists but didn't resolve
return done(null, undefined);
}
// No exports field, fall back to traditional resolution
if (parsed.subpath === '.') {
loadAsDirectory(pkgDir, pkg, function (err, result, resultPkg) {
if (err) return done(err);
if (result) return done(null, result, resultPkg);
processExportsDirs(dirs, idx + 1);
});
} else {
var subPath = path.join(pkgDir, parsed.subpath.slice(1));
loadAsFile(subPath, pkg, function (err, m, mPkg) {
if (err) return done(err);
if (m) return done(null, m, mPkg);
loadAsDirectory(subPath, pkg, function (err, n, nPkg) {
if (err) return done(err);
if (n) return done(null, n, nPkg);
processExportsDirs(dirs, idx + 1);
});
});
}
});
});
});
}
}
};