rollup-plugin-node-resolve - npm Package Compare versions

Comparing version 4.0.0 to 4.2.4

index.d.ts

+import {Plugin} from 'rollup';
+import {AsyncOpts} from 'resolve';
+
+export interface Options {
+	/**
+	 * the fields to scan in a package.json to determine the entry point
+	 * if this list contains "browser", overrides specified in "pkg.browser"
+	 * will be used
+	 * @default ['module', 'main']
+	 */
+	mainFields?: ReadonlyArray<string>;
+
+	/**
+	 * @deprecated use "mainFields" instead
+	 * use "module" field for ES6 module if possible
+	 * @default true
+	 */
+	module?: boolean;
+
+	/**
+	 * @deprecated use "mainFields" instead
+	 * use "jsnext:main" if possible
+	 * legacy field pointing to ES6 module in third-party libraries,
+	 * deprecated in favor of "pkg.module":
+	 * - see: https://github.com/rollup/rollup/wiki/pkg.module
+	 * @default false
+	 */
+	jsnext?: boolean;
+
+	/**
+	 * @deprecated use "mainFields" instead
+	 * use "main" field or index.js, even if it's not an ES6 module
+	 * (needs to be converted from CommonJS to ES6)
+	 * – see https://github.com/rollup/rollup-plugin-commonjs
+	 * @default true
+	 */
+	main?: boolean;
+
+	/**
+	 * some package.json files have a "browser" field which specifies
+	 * alternative files to load for people bundling for the browser. If
+	 * that's you, either use this option or add "browser" to the
+	 * "mainfields" option, otherwise pkg.browser will be ignored
+	 * @default false
+	 */
+	browser?: boolean;
+
+	/**
+	 * not all files you want to resolve are .js files
+	 * @default [ '.mjs', '.js', '.json', '.node' ]
+	 */
+	extensions?: ReadonlyArray<string>;
+
+	/**
+	 * whether to prefer built-in modules (e.g. `fs`, `path`) or
+	 * local ones with the same names
+	 * @default true
+	 */
+	preferBuiltins?: boolean;
+
+	/**
+	 * Lock the module search in this path (like a chroot). Module defined
+	 * outside this path will be marked as external
+	 * @default '/'
+	 */
+	jail?: string;
+
+	/**
+	 * Set to an array of strings and/or regexps to lock the module search
+	 * to modules that match at least one entry. Modules not matching any
+	 * entry will be marked as external
+	 * @default null
+	 */
+	only?: ReadonlyArray<string | RegExp> | null;
+
+	/**
+	 * If true, inspect resolved files to check that they are
+	 * ES2015 modules
+	 * @default false
+	 */
+	modulesOnly?: boolean;
+
+	/**
+	 * Force resolving for these modules to root's node_modules that helps
+	 * to prevent bundling the same package multiple times if package is
+	 * imported from dependencies.
+	 */
+	dedupe?: string[];
+
+	/**
+	 * Any additional options that should be passed through
+	 * to node-resolve
+	 */
+	customResolveOptions?: AsyncOpts;
+}
+
+/**
+ * Locate modules using the Node resolution algorithm, for using third party modules in node_modules
+ */
+export default function nodeResolve(options?: Options): Plugin;

CHANGELOG.md

 # rollup-plugin-node-resolve changelog
 
+## 4.2.4 (2019-05-11)
+
+* Add note on builtins to Readme ([#215](https://github.com/rollup/rollup-plugin-node-resolve/pull/215) by @keithamus)
+* Add issue templates ([#217](https://github.com/rollup/rollup-plugin-node-resolve/pull/217) by @mecurc)
+* Improve performance by caching `isDir` ([#218](https://github.com/rollup/rollup-plugin-node-resolve/pull/218) by @keithamus)
+
+## 4.2.3 (2019-04-11)
+
+* Fix ordering of jsnext:main when using the jsnext option ([#209](https://github.com/rollup/rollup-plugin-node-resolve/pull/209) by @lukastaegert)
+
+## 4.2.2 (2019-04-10)
+
+* Fix TypeScript typings (rename and export Options interface) ([#206](https://github.com/rollup/rollup-plugin-node-resolve/pull/206) by @Kocal)
+* Fix mainfields typing ([#207](https://github.com/rollup/rollup-plugin-node-resolve/pull/207) by @nicolashenry)
+
+## 4.2.1 (2019-04-06)
+
+* Respect setting the deprecated fields "module", "main", and "jsnext" ([#204](https://github.com/rollup/rollup-plugin-node-resolve/pull/204) by @nick-woodward)
+
+## 4.2.0 (2019-04-06)
+
+* Add new mainfields option ([#182](https://github.com/rollup/rollup-plugin-node-resolve/pull/182) by @keithamus)
+* Added dedupe option to prevent bundling the same package multiple times ([#201](https://github.com/rollup/rollup-plugin-node-resolve/pull/182) by @sormy)
+
+## 4.1.0 (2019-04-05)
+
+* Add TypeScript typings ([#189](https://github.com/rollup/rollup-plugin-node-resolve/pull/189) by @NotWoods)
+* Update dependencies ([#202](https://github.com/rollup/rollup-plugin-node-resolve/pull/202) by @lukastaegert)
+
+## 4.0.1 (2019-02-22)
+
+* Fix issue when external modules are specified in `package.browser` ([#143](https://github.com/rollup/rollup-plugin-node-resolve/pull/143) by @keithamus)
+* Fix `package.browser` mapping issue when `false` is specified ([#183](https://github.com/rollup/rollup-plugin-node-resolve/pull/183) by @allex)
+
 ## 4.0.0 (2018-12-09)
@@ -4,0 +38,0 @@

dist/rollup-plugin-node-resolve.cjs.js

@@ -16,28 +16,58 @@ 'use strict';
 
-var readFileCache = {};
 var readFileAsync = function (file) { return new Promise(function (fulfil, reject) { return fs.readFile(file, function (err, contents) { return err ? reject(err) : fulfil(contents); }); }); };
 var statAsync = function (file) { return new Promise(function (fulfil, reject) { return fs.stat(file, function (err, contents) { return err ? reject(err) : fulfil(contents); }); }); };
-function cachedReadFile (file, cb) {
-	if (file in readFileCache === false) {
-		readFileCache[file] = readFileAsync(file).catch(function (err) {
-			delete readFileCache[file];
-			throw err;
+var cache = function (fn) {
+	var cache = new Map();
+	var wrapped = function (param, done) {
+		if (cache.has(param) === false) {
+			cache.set(param, fn(param).catch(function (err) {
+				cache.delete(param);
+				throw err;
+			}));
+		}
+		return cache.get(param).then(function (result) { return done(null, result); }, done);
+	};
+	wrapped.clear = function () { return cache.clear(); };
+	return wrapped;
+};
+var ignoreENOENT = function (err) {
+	if (err.code === 'ENOENT') { return false; }
+	throw err;
+};
+var readFileCached = cache(readFileAsync);
+var isDirCached = cache(function (file) { return statAsync(file).then(function (stat) { return stat.isDirectory(); }, ignoreENOENT); });
+var isFileCached = cache(function (file) { return statAsync(file).then(function (stat) { return stat.isFile(); }, ignoreENOENT); });
+
+function getMainFields (options) {
+	var mainFields;
+	if (options.mainFields) {
+		if ('module' in options || 'main' in options || 'jsnext' in options) {
+			throw new Error("node-resolve: do not use deprecated 'module', 'main', 'jsnext' options with 'mainFields'");
+		}
+		mainFields = options.mainFields;
+	} else {
+		mainFields = [];
+		[['module', 'module', true], ['jsnext', 'jsnext:main', false], ['main', 'main', true]].forEach(function (ref) {
+			var option = ref[0];
+			var field = ref[1];
+			var defaultIncluded = ref[2];
+
+			if (option in options) {
+				// eslint-disable-next-line no-console
+				console.warn(("node-resolve: setting options." + option + " is deprecated, please override options.mainFields instead"));
+				if (options[option]) {
+					mainFields.push(field);
+				}
+			} else if (defaultIncluded) {
+				mainFields.push(field);
+			}
 		});
 	}
-	readFileCache[file].then(function (contents) { return cb(null, contents); }, cb);
-}
-
-var isFileCache = {};
-function cachedIsFile (file, cb) {
-	if (file in isFileCache === false) {
-		isFileCache[file] = statAsync(file)
-			.then(
-				function (stat) { return stat.isFile(); },
-				function (err) {
-					if (err.code == 'ENOENT') { return false; }
-					delete isFileCache[file];
-					throw err;
-				});
+	if (options.browser && mainFields.indexOf('browser') === -1) {
+		return ['browser'].concat(mainFields);
 	}
-	isFileCache[file].then(function (contents) { return cb(null, contents); }, cb);
+	if ( !mainFields.length ) {
+		throw new Error( "Please ensure at least one 'mainFields' value is specified" );
+	}
+	return mainFields;
 }
@@ -50,5 +80,5 @@
 
-	var useModule = options.module !== false;
-	var useMain = options.main !== false;
-	var useJsnext = options.jsnext === true;
+	var mainFields = getMainFields(options);
+	var useBrowserOverrides = mainFields.indexOf('browser') !== -1;
+	var dedupe = options.dedupe || [];
 	var isPreferBuiltinsSet = options.preferBuiltins === true || options.preferBuiltins === false;
@@ -70,6 +100,2 @@ var preferBuiltins = isPreferBuiltinsSet ? options.preferBuiltins : true;
 
-	if ( !useModule && !useMain && !useJsnext ) {
-		throw new Error( "At least one of options.module, options.main or options.jsnext must be true" );
-	}
-
 	var preserveSymlinks;
@@ -85,7 +111,8 @@
 		generateBundle: function generateBundle () {
-			isFileCache = {};
-			readFileCache = {};
+			readFileCached.clear();
+			isFileCached.clear();
+			isDirCached.clear();
 		},
 
-		resolveId: function resolveId$$1 ( importee, importer ) {
+		resolveId: function resolveId ( importee, importer ) {
 			var this$1 = this;
@@ -97,3 +124,8 @@
 
-			if (options.browser && browserMapCache[importer]) {
+			if (dedupe.indexOf(importee) !== -1) {
+				importee = path.join(process.cwd(), 'node_modules', importee);
+			}
+
+			// https://github.com/defunctzombie/package-browser-field-spec
+			if (useBrowserOverrides && browserMapCache[importer]) {
 				var resolvedImportee = path.resolve( basedir, importee );
@@ -109,3 +141,2 @@ var browser = browserMapCache[importer];
 
-
 			var parts = importee.split( /[/\\]/ );
@@ -132,5 +163,8 @@ var id = parts.shift();
 					var pkgRoot = path.dirname( pkgPath );
-					if (options.browser && typeof pkg[ 'browser' ] === 'object') {
+					if (useBrowserOverrides && typeof pkg[ 'browser' ] === 'object') {
 						packageBrowserField = Object.keys(pkg[ 'browser' ]).reduce(function (browser, key) {
-							var resolved = pkg[ 'browser' ][ key ] === false ? false : path.resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							var resolved = pkg[ 'browser' ][ key ];
+							if (resolved && resolved[0] === '.') {
+								resolved = path.resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							}
 							browser[ key ] = resolved;
@@ -151,9 +185,12 @@ if ( key[0] === '.' ) {
 
-					if (options.browser && typeof pkg[ 'browser' ] === 'string') {
-						pkg[ 'main' ] = pkg[ 'browser' ];
-					} else if ( useModule && pkg[ 'module' ] ) {
-						pkg[ 'main' ] = pkg[ 'module' ];
-					} else if ( useJsnext && pkg[ 'jsnext:main' ] ) {
-						pkg[ 'main' ] = pkg[ 'jsnext:main' ];
-					} else if ( ( useJsnext || useModule ) && !useMain ) {
+					var overriddenMain = false;
+					for ( var i = 0; i < mainFields.length; i++ ) {
+						var field = mainFields[i];
+						if ( typeof pkg[ field ] === 'string' ) {
+							pkg[ 'main' ] = pkg[ field ];
+							overriddenMain = true;
+							break;
+						}
+					}
+					if ( overriddenMain === false && mainFields.indexOf( 'main' ) === -1 ) {
 						disregardResult = true;
@@ -163,4 +200,5 @@ }
 				},
-				readFile: cachedReadFile,
-				isFile: cachedIsFile,
+				readFile: readFileCached,
+				isFile: isFileCached,
+				isDirectory: isDirCached,
 				extensions: extensions
@@ -177,6 +215,9 @@ };
 			)
-				.catch(function () { return false; })
 				.then(function (resolved) {
-					if (options.browser && packageBrowserField) {
-						if (packageBrowserField[ resolved ]) {
+					if ( resolved && useBrowserOverrides && packageBrowserField ) {
+						if ( packageBrowserField.hasOwnProperty(resolved) ) {
+							if (!packageBrowserField[resolved]) {
+								browserMapCache[resolved] = packageBrowserField;
+								return ES6_BROWSER_EMPTY;
+							}
 							resolved = packageBrowserField[ resolved ];
@@ -187,3 +228,3 @@ }
 
-					if ( !disregardResult && resolved !== false ) {
+					if ( !disregardResult ) {
 						if ( !preserveSymlinks && resolved && fs.existsSync( resolved ) ) {
@@ -212,5 +253,6 @@ resolved = fs.realpathSync( resolved );
 					} else {
-						return resolved === false ? null : resolved;
+						return resolved;
 					}
-				});
+				})
+				.catch(function () { return null; });
 		}
@@ -217,0 +259,0 @@ };

dist/rollup-plugin-node-resolve.es.js

@@ -1,2 +0,2 @@
-import { dirname, extname, normalize, resolve, sep } from 'path';
+import { dirname, join, resolve, normalize, sep, extname } from 'path';
 import builtins from 'builtin-modules';
@@ -12,28 +12,58 @@ import resolveId from 'resolve';
 
-var readFileCache = {};
 var readFileAsync = function (file) { return new Promise(function (fulfil, reject) { return fs.readFile(file, function (err, contents) { return err ? reject(err) : fulfil(contents); }); }); };
 var statAsync = function (file) { return new Promise(function (fulfil, reject) { return fs.stat(file, function (err, contents) { return err ? reject(err) : fulfil(contents); }); }); };
-function cachedReadFile (file, cb) {
-	if (file in readFileCache === false) {
-		readFileCache[file] = readFileAsync(file).catch(function (err) {
-			delete readFileCache[file];
-			throw err;
+var cache = function (fn) {
+	var cache = new Map();
+	var wrapped = function (param, done) {
+		if (cache.has(param) === false) {
+			cache.set(param, fn(param).catch(function (err) {
+				cache.delete(param);
+				throw err;
+			}));
+		}
+		return cache.get(param).then(function (result) { return done(null, result); }, done);
+	};
+	wrapped.clear = function () { return cache.clear(); };
+	return wrapped;
+};
+var ignoreENOENT = function (err) {
+	if (err.code === 'ENOENT') { return false; }
+	throw err;
+};
+var readFileCached = cache(readFileAsync);
+var isDirCached = cache(function (file) { return statAsync(file).then(function (stat) { return stat.isDirectory(); }, ignoreENOENT); });
+var isFileCached = cache(function (file) { return statAsync(file).then(function (stat) { return stat.isFile(); }, ignoreENOENT); });
+
+function getMainFields (options) {
+	var mainFields;
+	if (options.mainFields) {
+		if ('module' in options || 'main' in options || 'jsnext' in options) {
+			throw new Error("node-resolve: do not use deprecated 'module', 'main', 'jsnext' options with 'mainFields'");
+		}
+		mainFields = options.mainFields;
+	} else {
+		mainFields = [];
+		[['module', 'module', true], ['jsnext', 'jsnext:main', false], ['main', 'main', true]].forEach(function (ref) {
+			var option = ref[0];
+			var field = ref[1];
+			var defaultIncluded = ref[2];
+
+			if (option in options) {
+				// eslint-disable-next-line no-console
+				console.warn(("node-resolve: setting options." + option + " is deprecated, please override options.mainFields instead"));
+				if (options[option]) {
+					mainFields.push(field);
+				}
+			} else if (defaultIncluded) {
+				mainFields.push(field);
+			}
 		});
 	}
-	readFileCache[file].then(function (contents) { return cb(null, contents); }, cb);
-}
-
-var isFileCache = {};
-function cachedIsFile (file, cb) {
-	if (file in isFileCache === false) {
-		isFileCache[file] = statAsync(file)
-			.then(
-				function (stat) { return stat.isFile(); },
-				function (err) {
-					if (err.code == 'ENOENT') { return false; }
-					delete isFileCache[file];
-					throw err;
-				});
+	if (options.browser && mainFields.indexOf('browser') === -1) {
+		return ['browser'].concat(mainFields);
 	}
-	isFileCache[file].then(function (contents) { return cb(null, contents); }, cb);
+	if ( !mainFields.length ) {
+		throw new Error( "Please ensure at least one 'mainFields' value is specified" );
+	}
+	return mainFields;
 }
@@ -46,5 +76,5 @@
 
-	var useModule = options.module !== false;
-	var useMain = options.main !== false;
-	var useJsnext = options.jsnext === true;
+	var mainFields = getMainFields(options);
+	var useBrowserOverrides = mainFields.indexOf('browser') !== -1;
+	var dedupe = options.dedupe || [];
 	var isPreferBuiltinsSet = options.preferBuiltins === true || options.preferBuiltins === false;
@@ -66,6 +96,2 @@ var preferBuiltins = isPreferBuiltinsSet ? options.preferBuiltins : true;
 
-	if ( !useModule && !useMain && !useJsnext ) {
-		throw new Error( "At least one of options.module, options.main or options.jsnext must be true" );
-	}
-
 	var preserveSymlinks;
@@ -81,7 +107,8 @@
 		generateBundle: function generateBundle () {
-			isFileCache = {};
-			readFileCache = {};
+			readFileCached.clear();
+			isFileCached.clear();
+			isDirCached.clear();
 		},
 
-		resolveId: function resolveId$$1 ( importee, importer ) {
+		resolveId: function resolveId ( importee, importer ) {
 			var this$1 = this;
@@ -93,3 +120,8 @@
 
-			if (options.browser && browserMapCache[importer]) {
+			if (dedupe.indexOf(importee) !== -1) {
+				importee = join(process.cwd(), 'node_modules', importee);
+			}
+
+			// https://github.com/defunctzombie/package-browser-field-spec
+			if (useBrowserOverrides && browserMapCache[importer]) {
 				var resolvedImportee = resolve( basedir, importee );
@@ -105,3 +137,2 @@ var browser = browserMapCache[importer];
 
-
 			var parts = importee.split( /[/\\]/ );
@@ -128,5 +159,8 @@ var id = parts.shift();
 					var pkgRoot = dirname( pkgPath );
-					if (options.browser && typeof pkg[ 'browser' ] === 'object') {
+					if (useBrowserOverrides && typeof pkg[ 'browser' ] === 'object') {
 						packageBrowserField = Object.keys(pkg[ 'browser' ]).reduce(function (browser, key) {
-							var resolved = pkg[ 'browser' ][ key ] === false ? false : resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							var resolved = pkg[ 'browser' ][ key ];
+							if (resolved && resolved[0] === '.') {
+								resolved = resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							}
 							browser[ key ] = resolved;
@@ -147,9 +181,12 @@ if ( key[0] === '.' ) {
 
-					if (options.browser && typeof pkg[ 'browser' ] === 'string') {
-						pkg[ 'main' ] = pkg[ 'browser' ];
-					} else if ( useModule && pkg[ 'module' ] ) {
-						pkg[ 'main' ] = pkg[ 'module' ];
-					} else if ( useJsnext && pkg[ 'jsnext:main' ] ) {
-						pkg[ 'main' ] = pkg[ 'jsnext:main' ];
-					} else if ( ( useJsnext || useModule ) && !useMain ) {
+					var overriddenMain = false;
+					for ( var i = 0; i < mainFields.length; i++ ) {
+						var field = mainFields[i];
+						if ( typeof pkg[ field ] === 'string' ) {
+							pkg[ 'main' ] = pkg[ field ];
+							overriddenMain = true;
+							break;
+						}
+					}
+					if ( overriddenMain === false && mainFields.indexOf( 'main' ) === -1 ) {
 						disregardResult = true;
@@ -159,4 +196,5 @@ }
 				},
-				readFile: cachedReadFile,
-				isFile: cachedIsFile,
+				readFile: readFileCached,
+				isFile: isFileCached,
+				isDirectory: isDirCached,
 				extensions: extensions
@@ -173,6 +211,9 @@ };
 			)
-				.catch(function () { return false; })
 				.then(function (resolved) {
-					if (options.browser && packageBrowserField) {
-						if (packageBrowserField[ resolved ]) {
+					if ( resolved && useBrowserOverrides && packageBrowserField ) {
+						if ( packageBrowserField.hasOwnProperty(resolved) ) {
+							if (!packageBrowserField[resolved]) {
+								browserMapCache[resolved] = packageBrowserField;
+								return ES6_BROWSER_EMPTY;
+							}
 							resolved = packageBrowserField[ resolved ];
@@ -183,3 +224,3 @@ }
 
-					if ( !disregardResult && resolved !== false ) {
+					if ( !disregardResult ) {
 						if ( !preserveSymlinks && resolved && fs.existsSync( resolved ) ) {
@@ -208,5 +249,6 @@ resolved = fs.realpathSync( resolved );
 					} else {
-						return resolved === false ? null : resolved;
+						return resolved;
 					}
-				});
+				})
+				.catch(function () { return null; });
 		}
@@ -213,0 +255,0 @@ };

package.json

 {
   "name": "rollup-plugin-node-resolve",
   "description": "Bundle third-party dependencies in node_modules",
-  "version": "4.0.0",
+  "version": "4.2.4",
   "devDependencies": {
-    "buble": "^0.19.6",
-    "es5-ext": "^0.10.46",
-    "eslint": "^5.10.0",
-    "mocha": "^5.2.0",
-    "rollup": "^0.67.4",
-    "rollup-plugin-buble": "^0.19.4",
-    "rollup-plugin-commonjs": "^9.2.0",
+    "buble": "^0.19.7",
+    "es5-ext": "^0.10.49",
+    "eslint": "^5.16.0",
+    "mocha": "^6.1.2",
+    "rollup": "^1.9.3",
+    "rollup-plugin-buble": "^0.19.6",
+    "rollup-plugin-commonjs": "^9.3.4",
     "string-capitalize": "^1.0.1",
-    "vlq": "^1.0.0"
+    "typescript": "^3.4.3"
   },
@@ -23,3 +23,3 @@ "main": "dist/rollup-plugin-node-resolve.cjs.js",
     "test": "mocha",
-    "posttest": "eslint src test/*.js",
+    "posttest": "tsc && eslint src test/*.js",
     "lint": "eslint src",
@@ -31,8 +31,10 @@ "prepublishOnly": "npm test",
     "src",
-    "dist"
+    "dist",
+    "index.d.ts"
   ],
   "dependencies": {
-    "builtin-modules": "^3.0.0",
+    "@types/resolve": "0.0.8",
+    "builtin-modules": "^3.1.0",
     "is-module": "^1.0.0",
-    "resolve": "^1.8.1"
+    "resolve": "^1.10.0"
   },
@@ -39,0 +41,0 @@ "repository": "rollup/rollup-plugin-node-resolve",

README.md

@@ -23,10 +23,18 @@ # rollup-plugin-node-resolve
     file: 'bundle.js',
-    format: 'iife'
+    format: 'iife',
+    name: 'MyModule'
   },
-  name: 'MyModule',
   plugins: [
     resolve({
+
+      // the fields to scan in a package.json to determine the entry point
+      // if this list contains "browser", overrides specified in "pkg.browser"
+      // will be used
+      mainFields: ['module', 'main'], // Default: ['module', 'main']
+
+      // DEPRECATED: use "mainFields" instead
       // use "module" field for ES6 module if possible
       module: true, // Default: true
 
+      // DEPRECATED: use "mainFields" instead
       // use "jsnext:main" if possible
@@ -38,11 +46,12 @@ // legacy field pointing to ES6 module in third-party libraries,
 
+      // DEPRECATED: use "mainFields" instead
       // use "main" field or index.js, even if it's not an ES6 module
-      // (needs to be converted from CommonJS to ES6
+      // (needs to be converted from CommonJS to ES6)
       // – see https://github.com/rollup/rollup-plugin-commonjs
       main: true,  // Default: true
 
-      // some package.json files have a `browser` field which
-      // specifies alternative files to load for people bundling
-      // for the browser. If that's you, use this option, otherwise
-      // pkg.browser will be ignored
+      // some package.json files have a "browser" field which specifies
+      // alternative files to load for people bundling for the browser. If
+      // that's you, either use this option or add "browser" to the
+      // "mainfields" option, otherwise pkg.browser will be ignored
       browser: true,  // Default: false
@@ -70,2 +79,7 @@
 
+      // Force resolving for these modules to root's node_modules that helps
+      // to prevent bundling the same package multiple times if package is
+      // imported from dependencies.
+      dedupe: [ 'react', 'react-dom' ], // Default: []
+
       // Any additional options that should be passed through
@@ -104,5 +118,22 @@ // to node-resolve
 
+## Resolving Built-Ins (like `fs`)
 
+This plugin won't resolve any builtins (e.g. `fs`). If you need to resolve builtins you can install local modules and set `preferBuiltins` to `false`, or install a plugin like [rollup-plugin-node-builtins](https://github.com/calvinmetcalf/rollup-plugin-node-builtins) which provides stubbed versions of these methods.
+
+If you want to silence warnings about builtins, you can add the list of builtins to the `externals` option; like so:
+
+```js
+import resolve from 'rollup-plugin-node-resolve';
+import builtins from 'builtin-modules'
+export default ({
+  input: ...,
+  plugins: [resolve()],
+  externals: builtins,
+  output: ...
+})
+```
+
+
 ## License
 
 MIT

src/index.js

@@ -1,2 +0,2 @@
-import {dirname, extname, normalize, resolve, sep} from 'path';
+import {dirname, extname, join, normalize, resolve, sep} from 'path';
 import builtins from 'builtin-modules';
@@ -12,28 +12,54 @@ import resolveId from 'resolve';
 
-let readFileCache = {};
 const readFileAsync = file => new Promise((fulfil, reject) => fs.readFile(file, (err, contents) => err ? reject(err) : fulfil(contents)));
 const statAsync = file => new Promise((fulfil, reject) => fs.stat(file, (err, contents) => err ? reject(err) : fulfil(contents)));
-function cachedReadFile (file, cb) {
-	if (file in readFileCache === false) {
-		readFileCache[file] = readFileAsync(file).catch(err => {
-			delete readFileCache[file];
-			throw err;
+const cache = fn => {
+	const cache = new Map();
+	const wrapped = (param, done) => {
+		if (cache.has(param) === false) {
+			cache.set(param, fn(param).catch(err => {
+				cache.delete(param);
+				throw err;
+			}));
+		}
+		return cache.get(param).then(result => done(null, result), done);
+	};
+	wrapped.clear = () => cache.clear();
+	return wrapped;
+};
+const ignoreENOENT = err => {
+	if (err.code === 'ENOENT') return false;
+	throw err;
+};
+const readFileCached = cache(readFileAsync);
+const isDirCached = cache(file => statAsync(file).then(stat => stat.isDirectory(), ignoreENOENT));
+const isFileCached = cache(file => statAsync(file).then(stat => stat.isFile(), ignoreENOENT));
+
+function getMainFields (options) {
+	let mainFields;
+	if (options.mainFields) {
+		if ('module' in options || 'main' in options || 'jsnext' in options) {
+			throw new Error(`node-resolve: do not use deprecated 'module', 'main', 'jsnext' options with 'mainFields'`);
+		}
+		mainFields = options.mainFields;
+	} else {
+		mainFields = [];
+		[['module', 'module', true], ['jsnext', 'jsnext:main', false], ['main', 'main', true]].forEach(([option, field, defaultIncluded]) => {
+			if (option in options) {
+				// eslint-disable-next-line no-console
+				console.warn(`node-resolve: setting options.${option} is deprecated, please override options.mainFields instead`);
+				if (options[option]) {
+					mainFields.push(field);
+				}
+			} else if (defaultIncluded) {
+				mainFields.push(field);
+			}
 		});
 	}
-	readFileCache[file].then(contents => cb(null, contents), cb);
-}
-
-let isFileCache = {};
-function cachedIsFile (file, cb) {
-	if (file in isFileCache === false) {
-		isFileCache[file] = statAsync(file)
-			.then(
-				stat => stat.isFile(),
-				err => {
-					if (err.code == 'ENOENT') return false;
-					delete isFileCache[file];
-					throw err;
-				});
+	if (options.browser && mainFields.indexOf('browser') === -1) {
+		return ['browser'].concat(mainFields);
 	}
-	isFileCache[file].then(contents => cb(null, contents), cb);
+	if ( !mainFields.length ) {
+		throw new Error( `Please ensure at least one 'mainFields' value is specified` );
+	}
+	return mainFields;
 }
@@ -44,5 +70,5 @@
 export default function nodeResolve ( options = {} ) {
-	const useModule = options.module !== false;
-	const useMain = options.main !== false;
-	const useJsnext = options.jsnext === true;
+	const mainFields = getMainFields(options);
+	const useBrowserOverrides = mainFields.indexOf('browser') !== -1;
+	const dedupe = options.dedupe || [];
 	const isPreferBuiltinsSet = options.preferBuiltins === true || options.preferBuiltins === false;
@@ -64,6 +90,2 @@ const preferBuiltins = isPreferBuiltinsSet ? options.preferBuiltins : true;
 
-	if ( !useModule && !useMain && !useJsnext ) {
-		throw new Error( `At least one of options.module, options.main or options.jsnext must be true` );
-	}
-
 	let preserveSymlinks;
@@ -79,4 +101,5 @@
 		generateBundle () {
-			isFileCache = {};
-			readFileCache = {};
+			readFileCached.clear();
+			isFileCached.clear();
+			isDirCached.clear();
 		},
@@ -89,3 +112,8 @@
 
-			if (options.browser && browserMapCache[importer]) {
+			if (dedupe.indexOf(importee) !== -1) {
+				importee = join(process.cwd(), 'node_modules', importee);
+			}
+
+			// https://github.com/defunctzombie/package-browser-field-spec
+			if (useBrowserOverrides && browserMapCache[importer]) {
 				const resolvedImportee = resolve( basedir, importee );
@@ -101,3 +129,2 @@ const browser = browserMapCache[importer];
 
-
 			const parts = importee.split( /[/\\]/ );
@@ -124,5 +151,8 @@ let id = parts.shift();
 					const pkgRoot = dirname( pkgPath );
-					if (options.browser && typeof pkg[ 'browser' ] === 'object') {
+					if (useBrowserOverrides && typeof pkg[ 'browser' ] === 'object') {
 						packageBrowserField = Object.keys(pkg[ 'browser' ]).reduce((browser, key) => {
-							const resolved = pkg[ 'browser' ][ key ] === false ? false : resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							let resolved = pkg[ 'browser' ][ key ];
+							if (resolved && resolved[0] === '.') {
+								resolved = resolve( pkgRoot, pkg[ 'browser' ][ key ] );
+							}
 							browser[ key ] = resolved;
@@ -143,9 +173,12 @@ if ( key[0] === '.' ) {
 
-					if (options.browser && typeof pkg[ 'browser' ] === 'string') {
-						pkg[ 'main' ] = pkg[ 'browser' ];
-					} else if ( useModule && pkg[ 'module' ] ) {
-						pkg[ 'main' ] = pkg[ 'module' ];
-					} else if ( useJsnext && pkg[ 'jsnext:main' ] ) {
-						pkg[ 'main' ] = pkg[ 'jsnext:main' ];
-					} else if ( ( useJsnext || useModule ) && !useMain ) {
+					let overriddenMain = false;
+					for ( let i = 0; i < mainFields.length; i++ ) {
+						const field = mainFields[i];
+						if ( typeof pkg[ field ] === 'string' ) {
+							pkg[ 'main' ] = pkg[ field ];
+							overriddenMain = true;
+							break;
+						}
+					}
+					if ( overriddenMain === false && mainFields.indexOf( 'main' ) === -1 ) {
 						disregardResult = true;
@@ -155,4 +188,5 @@ }
 				},
-				readFile: cachedReadFile,
-				isFile: cachedIsFile,
+				readFile: readFileCached,
+				isFile: isFileCached,
+				isDirectory: isDirCached,
 				extensions: extensions
@@ -169,6 +203,9 @@ };
 			)
-				.catch(() => false)
 				.then(resolved => {
-					if (options.browser && packageBrowserField) {
-						if (packageBrowserField[ resolved ]) {
+					if ( resolved && useBrowserOverrides && packageBrowserField ) {
+						if ( packageBrowserField.hasOwnProperty(resolved) ) {
+							if (!packageBrowserField[resolved]) {
+								browserMapCache[resolved] = packageBrowserField;
+								return ES6_BROWSER_EMPTY;
+							}
 							resolved = packageBrowserField[ resolved ];
@@ -179,3 +216,3 @@ }
 
-					if ( !disregardResult && resolved !== false ) {
+					if ( !disregardResult ) {
 						if ( !preserveSymlinks && resolved && fs.existsSync( resolved ) ) {
@@ -204,7 +241,8 @@ resolved = fs.realpathSync( resolved );
 					} else {
-						return resolved === false ? null : resolved;
+						return resolved;
 					}
-				});
+				})
+				.catch(() => null);
 		}
 	};
 }

New alerts

Filesystem access

Supply chain risk

Accesses the file system, and could potentially read sensitive data.

Found 1 instance in 1 package

URL strings

Supply chain risk

Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

Found 1 instance in 1 package

Fixed alerts

New author

Supply chain risk

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

Found 1 instance in 1 package

Filesystem access

Supply chain risk

Accesses the file system, and could potentially read sensitive data.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

39794

35.14%

Number of package files

8

14.29%

Lines of code

735

40%

Number of lines in readme file

136

29.52%

Number of medium supply chain risk alerts

0

-100%

Worsened metrics

Dependency count

4

33.33%

Number of low supply chain risk alerts

5

25%