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

Comparing version 15.2.0 to 15.2.1

dist/cjs/index.js

@@ -15,3 +15,3 @@ 'use strict';
 
-var version = "15.2.0";
+var version = "15.2.1";
 var peerDependencies = {
@@ -25,14 +25,13 @@ rollup: "^2.78.0||^3.0.0"
 const stat = util.promisify(fs.stat);
-
 async function fileExists(filePath) {
-  try {
-    const res = await stat(filePath);
-    return res.isFile();
-  } catch {
-    return false;
-  }
+    try {
+        const res = await stat(filePath);
+        return res.isFile();
+    }
+    catch {
+        return false;
+    }
 }
-
 async function resolveSymlink(path) {
-  return (await fileExists(path)) ? realpath(path) : path;
+    return (await fileExists(path)) ? realpath(path) : path;
 }
@@ -313,301 +312,370 @@
 /* eslint-disable no-await-in-loop */
-
 function isModuleDir(current, moduleDirs) {
-  return moduleDirs.some((dir) => current.endsWith(dir));
+    return moduleDirs.some((dir) => current.endsWith(dir));
 }
-
 async function findPackageJson(base, moduleDirs) {
-  const { root } = path.parse(base);
-  let current = base;
-
-  while (current !== root && !isModuleDir(current, moduleDirs)) {
-    const pkgJsonPath = path.join(current, 'package.json');
-    if (await fileExists(pkgJsonPath)) {
-      const pkgJsonString = fs.readFileSync(pkgJsonPath, 'utf-8');
-      return { pkgJson: JSON.parse(pkgJsonString), pkgPath: current, pkgJsonPath };
+    const { root } = path.parse(base);
+    let current = base;
+    while (current !== root && !isModuleDir(current, moduleDirs)) {
+        const pkgJsonPath = path.join(current, 'package.json');
+        if (await fileExists(pkgJsonPath)) {
+            const pkgJsonString = fs.readFileSync(pkgJsonPath, 'utf-8');
+            return { pkgJson: JSON.parse(pkgJsonString), pkgPath: current, pkgJsonPath };
+        }
+        current = path.resolve(current, '..');
     }
-    current = path.resolve(current, '..');
-  }
-  return null;
+    return null;
 }
-
 function isUrl(str) {
-  try {
-    return !!new URL(str);
-  } catch (_) {
-    return false;
-  }
+    try {
+        return !!new URL(str);
+    }
+    catch (_) {
+        return false;
+    }
 }
-
+/**
+ * Conditions is an export object where all keys are conditions like 'node' (aka do not with '.')
+ */
 function isConditions(exports) {
-  return typeof exports === 'object' && Object.keys(exports).every((k) => !k.startsWith('.'));
+    return typeof exports === 'object' && Object.keys(exports).every((k) => !k.startsWith('.'));
 }
-
+/**
+ * Mappings is an export object where all keys start with '.
+ */
 function isMappings(exports) {
-  return typeof exports === 'object' && !isConditions(exports);
+    return typeof exports === 'object' && !isConditions(exports);
 }
-
+/**
+ * Check for mixed exports, which are exports where some keys start with '.' and some do not
+ */
 function isMixedExports(exports) {
-  const keys = Object.keys(exports);
-  return keys.some((k) => k.startsWith('.')) && keys.some((k) => !k.startsWith('.'));
+    const keys = Object.keys(exports);
+    return keys.some((k) => k.startsWith('.')) && keys.some((k) => !k.startsWith('.'));
 }
-
 function createBaseErrorMsg(importSpecifier, importer) {
-  return `Could not resolve import "${importSpecifier}" in ${importer}`;
+    return `Could not resolve import "${importSpecifier}" in ${importer}`;
 }
-
-function createErrorMsg(context, reason, internal) {
-  const { importSpecifier, importer, pkgJsonPath } = context;
-  const base = createBaseErrorMsg(importSpecifier, importer);
-  const field = internal ? 'imports' : 'exports';
-  return `${base} using ${field} defined in ${pkgJsonPath}.${reason ? ` ${reason}` : ''}`;
+function createErrorMsg(context, reason, isImports) {
+    const { importSpecifier, importer, pkgJsonPath } = context;
+    const base = createBaseErrorMsg(importSpecifier, importer);
+    const field = isImports ? 'imports' : 'exports';
+    return `${base} using ${field} defined in ${pkgJsonPath}.${reason ? ` ${reason}` : ''}`;
 }
-
-class ResolveError extends Error {}
-
+class ResolveError extends Error {
+}
 class InvalidConfigurationError extends ResolveError {
-  constructor(context, reason) {
-    super(createErrorMsg(context, `Invalid "exports" field. ${reason}`));
-  }
+    constructor(context, reason) {
+        super(createErrorMsg(context, `Invalid "exports" field. ${reason}`));
+    }
 }
-
 class InvalidModuleSpecifierError extends ResolveError {
-  constructor(context, internal, reason) {
-    super(createErrorMsg(context, reason, internal));
-  }
+    constructor(context, isImports, reason) {
+        super(createErrorMsg(context, reason, isImports));
+    }
 }
-
 class InvalidPackageTargetError extends ResolveError {
-  constructor(context, reason) {
-    super(createErrorMsg(context, reason));
-  }
+    constructor(context, reason) {
+        super(createErrorMsg(context, reason));
+    }
 }
 
 /* eslint-disable no-await-in-loop, no-undefined */
-
+/**
+ * Check for invalid path segments
+ */
 function includesInvalidSegments(pathSegments, moduleDirs) {
-  return pathSegments
-    .split('/')
-    .slice(1)
-    .some((t) => ['.', '..', ...moduleDirs].includes(t));
+    const invalidSegments = ['', '.', '..', ...moduleDirs];
+    // contains any "", ".", "..", or "node_modules" segments, including percent encoded variants
+    return pathSegments.some((v) => invalidSegments.includes(v) || invalidSegments.includes(decodeURI(v)));
 }
-
-async function resolvePackageTarget(context, { target, subpath, pattern, internal }) {
-  if (typeof target === 'string') {
-    if (!pattern && subpath.length > 0 && !target.endsWith('/')) {
-      throw new InvalidModuleSpecifierError(context);
+async function resolvePackageTarget(context, { target, patternMatch, isImports }) {
+    // If target is a String, then
+    if (typeof target === 'string') {
+        // If target does not start with "./", then
+        if (!target.startsWith('./')) {
+            // If isImports is false, or if target starts with "../" or "/", or if target is a valid URL, then
+            if (!isImports || ['/', '../'].some((p) => target.startsWith(p)) || isUrl(target)) {
+                // Throw an Invalid Package Target error.
+                throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+            }
+            // If patternMatch is a String, then
+            if (typeof patternMatch === 'string') {
+                // Return PACKAGE_RESOLVE(target with every instance of "*" replaced by patternMatch, packageURL + "/")
+                const result = await context.resolveId(target.replace(/\*/g, patternMatch), context.pkgURL.href);
+                return result ? url.pathToFileURL(result.location).href : null;
+            }
+            // Return PACKAGE_RESOLVE(target, packageURL + "/").
+            const result = await context.resolveId(target, context.pkgURL.href);
+            return result ? url.pathToFileURL(result.location).href : null;
+        }
+        // TODO: Drop if we do not support Node <= 16 anymore
+        // This behavior was removed in Node 17 (deprecated in Node 14), see DEP0148
+        if (context.allowExportsFolderMapping) {
+            target = target.replace(/\/$/, '/*');
+        }
+        // If target split on "/" or "\"
+        {
+            const pathSegments = target.split(/\/|\\/);
+            // after the first "." segment
+            const firstDot = pathSegments.indexOf('.');
+            firstDot !== -1 && pathSegments.slice(firstDot);
+            if (firstDot !== -1 &&
+                firstDot < pathSegments.length - 1 &&
+                includesInvalidSegments(pathSegments.slice(firstDot + 1), context.moduleDirs)) {
+                throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+            }
+        }
+        // Let resolvedTarget be the URL resolution of the concatenation of packageURL and target.
+        const resolvedTarget = new URL(target, context.pkgURL);
+        // Assert: resolvedTarget is contained in packageURL.
+        if (!resolvedTarget.href.startsWith(context.pkgURL.href)) {
+            throw new InvalidPackageTargetError(context, `Resolved to ${resolvedTarget.href} which is outside package ${context.pkgURL.href}`);
+        }
+        // If patternMatch is null, then
+        if (!patternMatch) {
+            // Return resolvedTarget.
+            return resolvedTarget;
+        }
+        // If patternMatch split on "/" or "\" contains invalid segments
+        if (includesInvalidSegments(patternMatch.split(/\/|\\/), context.moduleDirs)) {
+            // throw an Invalid Module Specifier error.
+            throw new InvalidModuleSpecifierError(context);
+        }
+        // Return the URL resolution of resolvedTarget with every instance of "*" replaced with patternMatch.
+        return resolvedTarget.href.replace(/\*/g, patternMatch);
     }
-
-    if (!target.startsWith('./')) {
-      if (internal && !['/', '../'].some((p) => target.startsWith(p)) && !isUrl(target)) {
-        // this is a bare package import, remap it and resolve it using regular node resolve
-        if (pattern) {
-          const result = await context.resolveId(
-            target.replace(/\*/g, subpath),
-            context.pkgURL.href
-          );
-          return result ? url.pathToFileURL(result.location).href : null;
+    // Otherwise, if target is an Array, then
+    if (Array.isArray(target)) {
+        // If _target.length is zero, return null.
+        if (target.length === 0) {
+            return null;
         }
-
-        const result = await context.resolveId(`${target}${subpath}`, context.pkgURL.href);
-        return result ? url.pathToFileURL(result.location).href : null;
-      }
-      throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+        let lastError = null;
+        // For each item in target, do
+        for (const item of target) {
+            // Let resolved be the result of PACKAGE_TARGET_RESOLVE of the item
+            // continuing the loop on any Invalid Package Target error.
+            try {
+                const resolved = await resolvePackageTarget(context, {
+                    target: item,
+                    patternMatch,
+                    isImports
+                });
+                // If resolved is undefined, continue the loop.
+                // Else Return resolved.
+                if (resolved !== undefined) {
+                    return resolved;
+                }
+            }
+            catch (error) {
+                if (!(error instanceof InvalidPackageTargetError)) {
+                    throw error;
+                }
+                else {
+                    lastError = error;
+                }
+            }
+        }
+        // Return or throw the last fallback resolution null return or error
+        if (lastError) {
+            throw lastError;
+        }
+        return null;
     }
-
-    if (includesInvalidSegments(target, context.moduleDirs)) {
-      throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+    // Otherwise, if target is a non-null Object, then
+    if (target && typeof target === 'object') {
+        // For each property of target
+        for (const [key, value] of Object.entries(target)) {
+            // If exports contains any index property keys, as defined in ECMA-262 6.1.7 Array Index, throw an Invalid Package Configuration error.
+            // TODO: We do not check if the key is a number here...
+            // If key equals "default" or conditions contains an entry for the key, then
+            if (key === 'default' || context.conditions.includes(key)) {
+                // Let targetValue be the value of the property in target.
+                // Let resolved be the result of PACKAGE_TARGET_RESOLVE of the targetValue
+                const resolved = await resolvePackageTarget(context, {
+                    target: value,
+                    patternMatch,
+                    isImports
+                });
+                // If resolved is equal to undefined, continue the loop.
+                // Return resolved.
+                if (resolved !== undefined) {
+                    return resolved;
+                }
+            }
+        }
+        // Return undefined.
+        return undefined;
     }
-
-    const resolvedTarget = new URL(target, context.pkgURL);
-    if (!resolvedTarget.href.startsWith(context.pkgURL.href)) {
-      throw new InvalidPackageTargetError(
-        context,
-        `Resolved to ${resolvedTarget.href} which is outside package ${context.pkgURL.href}`
-      );
+    // Otherwise, if target is null, return null.
+    if (target === null) {
+        return null;
     }
+    // Otherwise throw an Invalid Package Target error.
+    throw new InvalidPackageTargetError(context, `Invalid exports field.`);
+}
 
-    if (includesInvalidSegments(subpath, context.moduleDirs)) {
-      throw new InvalidModuleSpecifierError(context);
+/* eslint-disable no-await-in-loop */
+/**
+ * Implementation of Node's `PATTERN_KEY_COMPARE` function
+ */
+function nodePatternKeyCompare(keyA, keyB) {
+    // Let baseLengthA be the index of "*" in keyA plus one, if keyA contains "*", or the length of keyA otherwise.
+    const baseLengthA = keyA.includes('*') ? keyA.indexOf('*') + 1 : keyA.length;
+    // Let baseLengthB be the index of "*" in keyB plus one, if keyB contains "*", or the length of keyB otherwise.
+    const baseLengthB = keyB.includes('*') ? keyB.indexOf('*') + 1 : keyB.length;
+    // if baseLengthA is greater, return -1, if lower 1
+    const rval = baseLengthB - baseLengthA;
+    if (rval !== 0)
+        return rval;
+    // If keyA does not contain "*", return 1.
+    if (!keyA.includes('*'))
+        return 1;
+    // If keyB does not contain "*", return -1.
+    if (!keyB.includes('*'))
+        return -1;
+    // If the length of keyA is greater than the length of keyB, return -1.
+    // If the length of keyB is greater than the length of keyA, return 1.
+    // Else Return 0.
+    return keyB.length - keyA.length;
+}
+async function resolvePackageImportsExports(context, { matchKey, matchObj, isImports }) {
+    // If matchKey is a key of matchObj and does not contain "*", then
+    if (!matchKey.includes('*') && matchKey in matchObj) {
+        // Let target be the value of matchObj[matchKey].
+        const target = matchObj[matchKey];
+        // Return the result of PACKAGE_TARGET_RESOLVE(packageURL, target, null, isImports, conditions).
+        const resolved = await resolvePackageTarget(context, { target, patternMatch: '', isImports });
+        return resolved;
     }
+    // Let expansionKeys be the list of keys of matchObj containing only a single "*"
+    const expansionKeys = Object.keys(matchObj)
+        // Assert: ends with "/" or contains only a single "*".
+        .filter((k) => k.endsWith('/') || k.includes('*'))
+        // sorted by the sorting function PATTERN_KEY_COMPARE which orders in descending order of specificity.
+        .sort(nodePatternKeyCompare);
+    // For each key expansionKey in expansionKeys, do
+    for (const expansionKey of expansionKeys) {
+        const indexOfAsterisk = expansionKey.indexOf('*');
+        // Let patternBase be the substring of expansionKey up to but excluding the first "*" character.
+        const patternBase = indexOfAsterisk === -1 ? expansionKey : expansionKey.substring(0, indexOfAsterisk);
+        // If matchKey starts with but is not equal to patternBase, then
+        if (matchKey.startsWith(patternBase) && matchKey !== patternBase) {
+            // Let patternTrailer be the substring of expansionKey from the index after the first "*" character.
+            const patternTrailer = indexOfAsterisk !== -1 ? expansionKey.substring(indexOfAsterisk + 1) : '';
+            // If patternTrailer has zero length,
+            if (patternTrailer.length === 0 ||
+                // or if matchKey ends with patternTrailer and the length of matchKey is greater than or equal to the length of expansionKey, then
+                (matchKey.endsWith(patternTrailer) && matchKey.length >= expansionKey.length)) {
+                // Let target be the value of matchObj[expansionKey].
+                const target = matchObj[expansionKey];
+                // Let patternMatch be the substring of matchKey starting at the index of the length of patternBase up to the length
+                // of matchKey minus the length of patternTrailer.
+                const patternMatch = matchKey.substring(patternBase.length, matchKey.length - patternTrailer.length);
+                // Return the result of PACKAGE_TARGET_RESOLVE
+                const resolved = await resolvePackageTarget(context, {
+                    target,
+                    patternMatch,
+                    isImports
+                });
+                return resolved;
+            }
+        }
+    }
+    throw new InvalidModuleSpecifierError(context, isImports);
+}
 
-    if (pattern) {
-      return resolvedTarget.href.replace(/\*/g, subpath);
+/**
+ * Implementation of PACKAGE_EXPORTS_RESOLVE
+ */
+async function resolvePackageExports(context, subpath, exports) {
+    // If exports is an Object with both a key starting with "." and a key not starting with "."
+    if (isMixedExports(exports)) {
+        // throw an Invalid Package Configuration error.
+        throw new InvalidConfigurationError(context, 'All keys must either start with ./, or without one.');
     }
-    return new URL(subpath, resolvedTarget).href;
-  }
-
-  if (Array.isArray(target)) {
-    let lastError;
-    for (const item of target) {
-      try {
-        const resolved = await resolvePackageTarget(context, {
-          target: item,
-          subpath,
-          pattern,
-          internal
-        });
-
-        // return if defined or null, but not undefined
-        if (resolved !== undefined) {
-          return resolved;
+    // If subpath is equal to ".", then
+    if (subpath === '.') {
+        // Let mainExport be undefined.
+        let mainExport;
+        // If exports is a String or Array, or an Object containing no keys starting with ".", then
+        if (typeof exports === 'string' || Array.isArray(exports) || isConditions(exports)) {
+            // Set mainExport to exports
+            mainExport = exports;
+            // Otherwise if exports is an Object containing a "." property, then
         }
-      } catch (error) {
-        if (!(error instanceof InvalidPackageTargetError)) {
-          throw error;
-        } else {
-          lastError = error;
+        else if (isMappings(exports)) {
+            // Set mainExport to exports["."]
+            mainExport = exports['.'];
         }
-      }
+        // If mainExport is not undefined, then
+        if (mainExport) {
+            // Let resolved be the result of PACKAGE_TARGET_RESOLVE with target = mainExport
+            const resolved = await resolvePackageTarget(context, {
+                target: mainExport,
+                patternMatch: '',
+                isImports: false
+            });
+            // If resolved is not null or undefined, return resolved.
+            if (resolved) {
+                return resolved;
+            }
+        }
+        // Otherwise, if exports is an Object and all keys of exports start with ".", then
     }
-
-    if (lastError) {
-      throw lastError;
-    }
-    return null;
-  }
-
-  if (target && typeof target === 'object') {
-    for (const [key, value] of Object.entries(target)) {
-      if (key === 'default' || context.conditions.includes(key)) {
-        const resolved = await resolvePackageTarget(context, {
-          target: value,
-          subpath,
-          pattern,
-          internal
+    else if (isMappings(exports)) {
+        // Let resolved be the result of PACKAGE_IMPORTS_EXPORTS_RESOLVE
+        const resolvedMatch = await resolvePackageImportsExports(context, {
+            matchKey: subpath,
+            matchObj: exports,
+            isImports: false
         });
-
-        // return if defined or null, but not undefined
-        if (resolved !== undefined) {
-          return resolved;
+        // If resolved is not null or undefined, return resolved.
+        if (resolvedMatch) {
+            return resolvedMatch;
         }
-      }
     }
-    return undefined;
-  }
-
-  if (target === null) {
-    return null;
-  }
-
-  throw new InvalidPackageTargetError(context, `Invalid exports field.`);
+    // Throw a Package Path Not Exported error.
+    throw new InvalidModuleSpecifierError(context);
 }
 
-/* eslint-disable no-await-in-loop */
-
-async function resolvePackageImportsExports(context, { matchKey, matchObj, internal }) {
-  if (!matchKey.endsWith('*') && matchKey in matchObj) {
-    const target = matchObj[matchKey];
-    const resolved = await resolvePackageTarget(context, { target, subpath: '', internal });
-    return resolved;
-  }
-
-  const expansionKeys = Object.keys(matchObj)
-    .filter((k) => k.endsWith('/') || k.endsWith('*'))
-    .sort((a, b) => b.length - a.length);
-
-  for (const expansionKey of expansionKeys) {
-    const prefix = expansionKey.substring(0, expansionKey.length - 1);
-
-    if (expansionKey.endsWith('*') && matchKey.startsWith(prefix)) {
-      const target = matchObj[expansionKey];
-      const subpath = matchKey.substring(expansionKey.length - 1);
-      const resolved = await resolvePackageTarget(context, {
-        target,
-        subpath,
-        pattern: true,
-        internal
-      });
-      return resolved;
+async function resolvePackageImports({ importSpecifier, importer, moduleDirs, conditions, resolveId }) {
+    const result = await findPackageJson(importer, moduleDirs);
+    if (!result) {
+        throw new Error(`${createBaseErrorMsg(importSpecifier, importer)}. Could not find a parent package.json.`);
     }
-
-    if (matchKey.startsWith(expansionKey)) {
-      const target = matchObj[expansionKey];
-      const subpath = matchKey.substring(expansionKey.length);
-
-      const resolved = await resolvePackageTarget(context, { target, subpath, internal });
-      return resolved;
+    const { pkgPath, pkgJsonPath, pkgJson } = result;
+    const pkgURL = url.pathToFileURL(`${pkgPath}/`);
+    const context = {
+        importer,
+        importSpecifier,
+        moduleDirs,
+        pkgURL,
+        pkgJsonPath,
+        conditions,
+        resolveId
+    };
+    // Assert: specifier begins with "#".
+    if (!importSpecifier.startsWith('#')) {
+        throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
     }
-  }
-
-  throw new InvalidModuleSpecifierError(context, internal);
-}
-
-async function resolvePackageExports(context, subpath, exports) {
-  if (isMixedExports(exports)) {
-    throw new InvalidConfigurationError(
-      context,
-      'All keys must either start with ./, or without one.'
-    );
-  }
-
-  if (subpath === '.') {
-    let mainExport;
-    // If exports is a String or Array, or an Object containing no keys starting with ".", then
-    if (typeof exports === 'string' || Array.isArray(exports) || isConditions(exports)) {
-      mainExport = exports;
-    } else if (isMappings(exports)) {
-      mainExport = exports['.'];
+    // If specifier is exactly equal to "#" or starts with "#/", then
+    if (importSpecifier === '#' || importSpecifier.startsWith('#/')) {
+        // Throw an Invalid Module Specifier error.
+        throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
     }
-
-    if (mainExport) {
-      const resolved = await resolvePackageTarget(context, { target: mainExport, subpath: '' });
-      if (resolved) {
-        return resolved;
-      }
+    const { imports } = pkgJson;
+    if (!imports) {
+        throw new InvalidModuleSpecifierError(context, true);
     }
-  } else if (isMappings(exports)) {
-    const resolvedMatch = await resolvePackageImportsExports(context, {
-      matchKey: subpath,
-      matchObj: exports
+    // Let packageURL be the result of LOOKUP_PACKAGE_SCOPE(parentURL).
+    // If packageURL is not null, then
+    return resolvePackageImportsExports(context, {
+        matchKey: importSpecifier,
+        matchObj: imports,
+        isImports: true
     });
-
-    if (resolvedMatch) {
-      return resolvedMatch;
-    }
-  }
-
-  throw new InvalidModuleSpecifierError(context);
 }
 
-async function resolvePackageImports({
-  importSpecifier,
-  importer,
-  moduleDirs,
-  conditions,
-  resolveId
-}) {
-  const result = await findPackageJson(importer, moduleDirs);
-  if (!result) {
-    throw new Error(createBaseErrorMsg('. Could not find a parent package.json.'));
-  }
-
-  const { pkgPath, pkgJsonPath, pkgJson } = result;
-  const pkgURL = url.pathToFileURL(`${pkgPath}/`);
-  const context = {
-    importer,
-    importSpecifier,
-    moduleDirs,
-    pkgURL,
-    pkgJsonPath,
-    conditions,
-    resolveId
-  };
-
-  const { imports } = pkgJson;
-  if (!imports) {
-    throw new InvalidModuleSpecifierError(context, true);
-  }
-
-  if (importSpecifier === '#' || importSpecifier.startsWith('#/')) {
-    throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
-  }
-
-  return resolvePackageImportsExports(context, {
-    matchKey: importSpecifier,
-    matchObj: imports,
-    internal: true
-  });
-}
-
 const resolveImportPath = util.promisify(resolve);
@@ -715,3 +783,4 @@ const readFile = util.promisify(fs.readFile);
   rootDir,
-  ignoreSideEffectsForRoot
+  ignoreSideEffectsForRoot,
+  allowExportsFolderMapping
 }) {
@@ -805,2 +874,3 @@ if (importSpecifier.startsWith('#')) {
         pkgJsonPath,
+        allowExportsFolderMapping,
         conditions: exportConditions
@@ -886,3 +956,4 @@ };
   rootDir,
-  ignoreSideEffectsForRoot
+  ignoreSideEffectsForRoot,
+  allowExportsFolderMapping
 }) {
@@ -903,3 +974,4 @@ try {
       rootDir,
-      ignoreSideEffectsForRoot
+      ignoreSideEffectsForRoot,
+      allowExportsFolderMapping
     });
@@ -991,3 +1063,5 @@ if (exportMapRes) return exportMapRes;
   moduleDirectories: ['node_modules'],
-  ignoreSideEffectsForRoot: false
+  ignoreSideEffectsForRoot: false,
+  // TODO: set to false in next major release or remove
+  allowExportsFolderMapping: true
 };
@@ -1138,3 +1212,4 @@ const DEFAULTS = deepFreeze(deepMerge({}, defaults));
       rootDir,
-      ignoreSideEffectsForRoot
+      ignoreSideEffectsForRoot,
+      allowExportsFolderMapping: options.allowExportsFolderMapping
     });
@@ -1141,0 +1216,0 @@

dist/es/index.js

@@ -11,3 +11,3 @@ import path, { dirname, resolve, extname, normalize, sep } from 'path';
 
-var version = "15.2.0";
+var version = "15.2.1";
 var peerDependencies = {
@@ -21,14 +21,13 @@ rollup: "^2.78.0||^3.0.0"
 const stat = promisify(fs.stat);
-
 async function fileExists(filePath) {
-  try {
-    const res = await stat(filePath);
-    return res.isFile();
-  } catch {
-    return false;
-  }
+    try {
+        const res = await stat(filePath);
+        return res.isFile();
+    }
+    catch {
+        return false;
+    }
 }
-
 async function resolveSymlink(path) {
-  return (await fileExists(path)) ? realpath(path) : path;
+    return (await fileExists(path)) ? realpath(path) : path;
 }
@@ -309,301 +308,370 @@
 /* eslint-disable no-await-in-loop */
-
 function isModuleDir(current, moduleDirs) {
-  return moduleDirs.some((dir) => current.endsWith(dir));
+    return moduleDirs.some((dir) => current.endsWith(dir));
 }
-
 async function findPackageJson(base, moduleDirs) {
-  const { root } = path.parse(base);
-  let current = base;
-
-  while (current !== root && !isModuleDir(current, moduleDirs)) {
-    const pkgJsonPath = path.join(current, 'package.json');
-    if (await fileExists(pkgJsonPath)) {
-      const pkgJsonString = fs.readFileSync(pkgJsonPath, 'utf-8');
-      return { pkgJson: JSON.parse(pkgJsonString), pkgPath: current, pkgJsonPath };
+    const { root } = path.parse(base);
+    let current = base;
+    while (current !== root && !isModuleDir(current, moduleDirs)) {
+        const pkgJsonPath = path.join(current, 'package.json');
+        if (await fileExists(pkgJsonPath)) {
+            const pkgJsonString = fs.readFileSync(pkgJsonPath, 'utf-8');
+            return { pkgJson: JSON.parse(pkgJsonString), pkgPath: current, pkgJsonPath };
+        }
+        current = path.resolve(current, '..');
     }
-    current = path.resolve(current, '..');
-  }
-  return null;
+    return null;
 }
-
 function isUrl(str) {
-  try {
-    return !!new URL(str);
-  } catch (_) {
-    return false;
-  }
+    try {
+        return !!new URL(str);
+    }
+    catch (_) {
+        return false;
+    }
 }
-
+/**
+ * Conditions is an export object where all keys are conditions like 'node' (aka do not with '.')
+ */
 function isConditions(exports) {
-  return typeof exports === 'object' && Object.keys(exports).every((k) => !k.startsWith('.'));
+    return typeof exports === 'object' && Object.keys(exports).every((k) => !k.startsWith('.'));
 }
-
+/**
+ * Mappings is an export object where all keys start with '.
+ */
 function isMappings(exports) {
-  return typeof exports === 'object' && !isConditions(exports);
+    return typeof exports === 'object' && !isConditions(exports);
 }
-
+/**
+ * Check for mixed exports, which are exports where some keys start with '.' and some do not
+ */
 function isMixedExports(exports) {
-  const keys = Object.keys(exports);
-  return keys.some((k) => k.startsWith('.')) && keys.some((k) => !k.startsWith('.'));
+    const keys = Object.keys(exports);
+    return keys.some((k) => k.startsWith('.')) && keys.some((k) => !k.startsWith('.'));
 }
-
 function createBaseErrorMsg(importSpecifier, importer) {
-  return `Could not resolve import "${importSpecifier}" in ${importer}`;
+    return `Could not resolve import "${importSpecifier}" in ${importer}`;
 }
-
-function createErrorMsg(context, reason, internal) {
-  const { importSpecifier, importer, pkgJsonPath } = context;
-  const base = createBaseErrorMsg(importSpecifier, importer);
-  const field = internal ? 'imports' : 'exports';
-  return `${base} using ${field} defined in ${pkgJsonPath}.${reason ? ` ${reason}` : ''}`;
+function createErrorMsg(context, reason, isImports) {
+    const { importSpecifier, importer, pkgJsonPath } = context;
+    const base = createBaseErrorMsg(importSpecifier, importer);
+    const field = isImports ? 'imports' : 'exports';
+    return `${base} using ${field} defined in ${pkgJsonPath}.${reason ? ` ${reason}` : ''}`;
 }
-
-class ResolveError extends Error {}
-
+class ResolveError extends Error {
+}
 class InvalidConfigurationError extends ResolveError {
-  constructor(context, reason) {
-    super(createErrorMsg(context, `Invalid "exports" field. ${reason}`));
-  }
+    constructor(context, reason) {
+        super(createErrorMsg(context, `Invalid "exports" field. ${reason}`));
+    }
 }
-
 class InvalidModuleSpecifierError extends ResolveError {
-  constructor(context, internal, reason) {
-    super(createErrorMsg(context, reason, internal));
-  }
+    constructor(context, isImports, reason) {
+        super(createErrorMsg(context, reason, isImports));
+    }
 }
-
 class InvalidPackageTargetError extends ResolveError {
-  constructor(context, reason) {
-    super(createErrorMsg(context, reason));
-  }
+    constructor(context, reason) {
+        super(createErrorMsg(context, reason));
+    }
 }
 
 /* eslint-disable no-await-in-loop, no-undefined */
-
+/**
+ * Check for invalid path segments
+ */
 function includesInvalidSegments(pathSegments, moduleDirs) {
-  return pathSegments
-    .split('/')
-    .slice(1)
-    .some((t) => ['.', '..', ...moduleDirs].includes(t));
+    const invalidSegments = ['', '.', '..', ...moduleDirs];
+    // contains any "", ".", "..", or "node_modules" segments, including percent encoded variants
+    return pathSegments.some((v) => invalidSegments.includes(v) || invalidSegments.includes(decodeURI(v)));
 }
-
-async function resolvePackageTarget(context, { target, subpath, pattern, internal }) {
-  if (typeof target === 'string') {
-    if (!pattern && subpath.length > 0 && !target.endsWith('/')) {
-      throw new InvalidModuleSpecifierError(context);
+async function resolvePackageTarget(context, { target, patternMatch, isImports }) {
+    // If target is a String, then
+    if (typeof target === 'string') {
+        // If target does not start with "./", then
+        if (!target.startsWith('./')) {
+            // If isImports is false, or if target starts with "../" or "/", or if target is a valid URL, then
+            if (!isImports || ['/', '../'].some((p) => target.startsWith(p)) || isUrl(target)) {
+                // Throw an Invalid Package Target error.
+                throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+            }
+            // If patternMatch is a String, then
+            if (typeof patternMatch === 'string') {
+                // Return PACKAGE_RESOLVE(target with every instance of "*" replaced by patternMatch, packageURL + "/")
+                const result = await context.resolveId(target.replace(/\*/g, patternMatch), context.pkgURL.href);
+                return result ? pathToFileURL(result.location).href : null;
+            }
+            // Return PACKAGE_RESOLVE(target, packageURL + "/").
+            const result = await context.resolveId(target, context.pkgURL.href);
+            return result ? pathToFileURL(result.location).href : null;
+        }
+        // TODO: Drop if we do not support Node <= 16 anymore
+        // This behavior was removed in Node 17 (deprecated in Node 14), see DEP0148
+        if (context.allowExportsFolderMapping) {
+            target = target.replace(/\/$/, '/*');
+        }
+        // If target split on "/" or "\"
+        {
+            const pathSegments = target.split(/\/|\\/);
+            // after the first "." segment
+            const firstDot = pathSegments.indexOf('.');
+            firstDot !== -1 && pathSegments.slice(firstDot);
+            if (firstDot !== -1 &&
+                firstDot < pathSegments.length - 1 &&
+                includesInvalidSegments(pathSegments.slice(firstDot + 1), context.moduleDirs)) {
+                throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+            }
+        }
+        // Let resolvedTarget be the URL resolution of the concatenation of packageURL and target.
+        const resolvedTarget = new URL(target, context.pkgURL);
+        // Assert: resolvedTarget is contained in packageURL.
+        if (!resolvedTarget.href.startsWith(context.pkgURL.href)) {
+            throw new InvalidPackageTargetError(context, `Resolved to ${resolvedTarget.href} which is outside package ${context.pkgURL.href}`);
+        }
+        // If patternMatch is null, then
+        if (!patternMatch) {
+            // Return resolvedTarget.
+            return resolvedTarget;
+        }
+        // If patternMatch split on "/" or "\" contains invalid segments
+        if (includesInvalidSegments(patternMatch.split(/\/|\\/), context.moduleDirs)) {
+            // throw an Invalid Module Specifier error.
+            throw new InvalidModuleSpecifierError(context);
+        }
+        // Return the URL resolution of resolvedTarget with every instance of "*" replaced with patternMatch.
+        return resolvedTarget.href.replace(/\*/g, patternMatch);
     }
-
-    if (!target.startsWith('./')) {
-      if (internal && !['/', '../'].some((p) => target.startsWith(p)) && !isUrl(target)) {
-        // this is a bare package import, remap it and resolve it using regular node resolve
-        if (pattern) {
-          const result = await context.resolveId(
-            target.replace(/\*/g, subpath),
-            context.pkgURL.href
-          );
-          return result ? pathToFileURL(result.location).href : null;
+    // Otherwise, if target is an Array, then
+    if (Array.isArray(target)) {
+        // If _target.length is zero, return null.
+        if (target.length === 0) {
+            return null;
         }
-
-        const result = await context.resolveId(`${target}${subpath}`, context.pkgURL.href);
-        return result ? pathToFileURL(result.location).href : null;
-      }
-      throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+        let lastError = null;
+        // For each item in target, do
+        for (const item of target) {
+            // Let resolved be the result of PACKAGE_TARGET_RESOLVE of the item
+            // continuing the loop on any Invalid Package Target error.
+            try {
+                const resolved = await resolvePackageTarget(context, {
+                    target: item,
+                    patternMatch,
+                    isImports
+                });
+                // If resolved is undefined, continue the loop.
+                // Else Return resolved.
+                if (resolved !== undefined) {
+                    return resolved;
+                }
+            }
+            catch (error) {
+                if (!(error instanceof InvalidPackageTargetError)) {
+                    throw error;
+                }
+                else {
+                    lastError = error;
+                }
+            }
+        }
+        // Return or throw the last fallback resolution null return or error
+        if (lastError) {
+            throw lastError;
+        }
+        return null;
     }
-
-    if (includesInvalidSegments(target, context.moduleDirs)) {
-      throw new InvalidPackageTargetError(context, `Invalid mapping: "${target}".`);
+    // Otherwise, if target is a non-null Object, then
+    if (target && typeof target === 'object') {
+        // For each property of target
+        for (const [key, value] of Object.entries(target)) {
+            // If exports contains any index property keys, as defined in ECMA-262 6.1.7 Array Index, throw an Invalid Package Configuration error.
+            // TODO: We do not check if the key is a number here...
+            // If key equals "default" or conditions contains an entry for the key, then
+            if (key === 'default' || context.conditions.includes(key)) {
+                // Let targetValue be the value of the property in target.
+                // Let resolved be the result of PACKAGE_TARGET_RESOLVE of the targetValue
+                const resolved = await resolvePackageTarget(context, {
+                    target: value,
+                    patternMatch,
+                    isImports
+                });
+                // If resolved is equal to undefined, continue the loop.
+                // Return resolved.
+                if (resolved !== undefined) {
+                    return resolved;
+                }
+            }
+        }
+        // Return undefined.
+        return undefined;
     }
-
-    const resolvedTarget = new URL(target, context.pkgURL);
-    if (!resolvedTarget.href.startsWith(context.pkgURL.href)) {
-      throw new InvalidPackageTargetError(
-        context,
-        `Resolved to ${resolvedTarget.href} which is outside package ${context.pkgURL.href}`
-      );
+    // Otherwise, if target is null, return null.
+    if (target === null) {
+        return null;
     }
+    // Otherwise throw an Invalid Package Target error.
+    throw new InvalidPackageTargetError(context, `Invalid exports field.`);
+}
 
-    if (includesInvalidSegments(subpath, context.moduleDirs)) {
-      throw new InvalidModuleSpecifierError(context);
+/* eslint-disable no-await-in-loop */
+/**
+ * Implementation of Node's `PATTERN_KEY_COMPARE` function
+ */
+function nodePatternKeyCompare(keyA, keyB) {
+    // Let baseLengthA be the index of "*" in keyA plus one, if keyA contains "*", or the length of keyA otherwise.
+    const baseLengthA = keyA.includes('*') ? keyA.indexOf('*') + 1 : keyA.length;
+    // Let baseLengthB be the index of "*" in keyB plus one, if keyB contains "*", or the length of keyB otherwise.
+    const baseLengthB = keyB.includes('*') ? keyB.indexOf('*') + 1 : keyB.length;
+    // if baseLengthA is greater, return -1, if lower 1
+    const rval = baseLengthB - baseLengthA;
+    if (rval !== 0)
+        return rval;
+    // If keyA does not contain "*", return 1.
+    if (!keyA.includes('*'))
+        return 1;
+    // If keyB does not contain "*", return -1.
+    if (!keyB.includes('*'))
+        return -1;
+    // If the length of keyA is greater than the length of keyB, return -1.
+    // If the length of keyB is greater than the length of keyA, return 1.
+    // Else Return 0.
+    return keyB.length - keyA.length;
+}
+async function resolvePackageImportsExports(context, { matchKey, matchObj, isImports }) {
+    // If matchKey is a key of matchObj and does not contain "*", then
+    if (!matchKey.includes('*') && matchKey in matchObj) {
+        // Let target be the value of matchObj[matchKey].
+        const target = matchObj[matchKey];
+        // Return the result of PACKAGE_TARGET_RESOLVE(packageURL, target, null, isImports, conditions).
+        const resolved = await resolvePackageTarget(context, { target, patternMatch: '', isImports });
+        return resolved;
     }
+    // Let expansionKeys be the list of keys of matchObj containing only a single "*"
+    const expansionKeys = Object.keys(matchObj)
+        // Assert: ends with "/" or contains only a single "*".
+        .filter((k) => k.endsWith('/') || k.includes('*'))
+        // sorted by the sorting function PATTERN_KEY_COMPARE which orders in descending order of specificity.
+        .sort(nodePatternKeyCompare);
+    // For each key expansionKey in expansionKeys, do
+    for (const expansionKey of expansionKeys) {
+        const indexOfAsterisk = expansionKey.indexOf('*');
+        // Let patternBase be the substring of expansionKey up to but excluding the first "*" character.
+        const patternBase = indexOfAsterisk === -1 ? expansionKey : expansionKey.substring(0, indexOfAsterisk);
+        // If matchKey starts with but is not equal to patternBase, then
+        if (matchKey.startsWith(patternBase) && matchKey !== patternBase) {
+            // Let patternTrailer be the substring of expansionKey from the index after the first "*" character.
+            const patternTrailer = indexOfAsterisk !== -1 ? expansionKey.substring(indexOfAsterisk + 1) : '';
+            // If patternTrailer has zero length,
+            if (patternTrailer.length === 0 ||
+                // or if matchKey ends with patternTrailer and the length of matchKey is greater than or equal to the length of expansionKey, then
+                (matchKey.endsWith(patternTrailer) && matchKey.length >= expansionKey.length)) {
+                // Let target be the value of matchObj[expansionKey].
+                const target = matchObj[expansionKey];
+                // Let patternMatch be the substring of matchKey starting at the index of the length of patternBase up to the length
+                // of matchKey minus the length of patternTrailer.
+                const patternMatch = matchKey.substring(patternBase.length, matchKey.length - patternTrailer.length);
+                // Return the result of PACKAGE_TARGET_RESOLVE
+                const resolved = await resolvePackageTarget(context, {
+                    target,
+                    patternMatch,
+                    isImports
+                });
+                return resolved;
+            }
+        }
+    }
+    throw new InvalidModuleSpecifierError(context, isImports);
+}
 
-    if (pattern) {
-      return resolvedTarget.href.replace(/\*/g, subpath);
+/**
+ * Implementation of PACKAGE_EXPORTS_RESOLVE
+ */
+async function resolvePackageExports(context, subpath, exports) {
+    // If exports is an Object with both a key starting with "." and a key not starting with "."
+    if (isMixedExports(exports)) {
+        // throw an Invalid Package Configuration error.
+        throw new InvalidConfigurationError(context, 'All keys must either start with ./, or without one.');
     }
-    return new URL(subpath, resolvedTarget).href;
-  }
-
-  if (Array.isArray(target)) {
-    let lastError;
-    for (const item of target) {
-      try {
-        const resolved = await resolvePackageTarget(context, {
-          target: item,
-          subpath,
-          pattern,
-          internal
-        });
-
-        // return if defined or null, but not undefined
-        if (resolved !== undefined) {
-          return resolved;
+    // If subpath is equal to ".", then
+    if (subpath === '.') {
+        // Let mainExport be undefined.
+        let mainExport;
+        // If exports is a String or Array, or an Object containing no keys starting with ".", then
+        if (typeof exports === 'string' || Array.isArray(exports) || isConditions(exports)) {
+            // Set mainExport to exports
+            mainExport = exports;
+            // Otherwise if exports is an Object containing a "." property, then
         }
-      } catch (error) {
-        if (!(error instanceof InvalidPackageTargetError)) {
-          throw error;
-        } else {
-          lastError = error;
+        else if (isMappings(exports)) {
+            // Set mainExport to exports["."]
+            mainExport = exports['.'];
         }
-      }
+        // If mainExport is not undefined, then
+        if (mainExport) {
+            // Let resolved be the result of PACKAGE_TARGET_RESOLVE with target = mainExport
+            const resolved = await resolvePackageTarget(context, {
+                target: mainExport,
+                patternMatch: '',
+                isImports: false
+            });
+            // If resolved is not null or undefined, return resolved.
+            if (resolved) {
+                return resolved;
+            }
+        }
+        // Otherwise, if exports is an Object and all keys of exports start with ".", then
     }
-
-    if (lastError) {
-      throw lastError;
-    }
-    return null;
-  }
-
-  if (target && typeof target === 'object') {
-    for (const [key, value] of Object.entries(target)) {
-      if (key === 'default' || context.conditions.includes(key)) {
-        const resolved = await resolvePackageTarget(context, {
-          target: value,
-          subpath,
-          pattern,
-          internal
+    else if (isMappings(exports)) {
+        // Let resolved be the result of PACKAGE_IMPORTS_EXPORTS_RESOLVE
+        const resolvedMatch = await resolvePackageImportsExports(context, {
+            matchKey: subpath,
+            matchObj: exports,
+            isImports: false
         });
-
-        // return if defined or null, but not undefined
-        if (resolved !== undefined) {
-          return resolved;
+        // If resolved is not null or undefined, return resolved.
+        if (resolvedMatch) {
+            return resolvedMatch;
         }
-      }
     }
-    return undefined;
-  }
-
-  if (target === null) {
-    return null;
-  }
-
-  throw new InvalidPackageTargetError(context, `Invalid exports field.`);
+    // Throw a Package Path Not Exported error.
+    throw new InvalidModuleSpecifierError(context);
 }
 
-/* eslint-disable no-await-in-loop */
-
-async function resolvePackageImportsExports(context, { matchKey, matchObj, internal }) {
-  if (!matchKey.endsWith('*') && matchKey in matchObj) {
-    const target = matchObj[matchKey];
-    const resolved = await resolvePackageTarget(context, { target, subpath: '', internal });
-    return resolved;
-  }
-
-  const expansionKeys = Object.keys(matchObj)
-    .filter((k) => k.endsWith('/') || k.endsWith('*'))
-    .sort((a, b) => b.length - a.length);
-
-  for (const expansionKey of expansionKeys) {
-    const prefix = expansionKey.substring(0, expansionKey.length - 1);
-
-    if (expansionKey.endsWith('*') && matchKey.startsWith(prefix)) {
-      const target = matchObj[expansionKey];
-      const subpath = matchKey.substring(expansionKey.length - 1);
-      const resolved = await resolvePackageTarget(context, {
-        target,
-        subpath,
-        pattern: true,
-        internal
-      });
-      return resolved;
+async function resolvePackageImports({ importSpecifier, importer, moduleDirs, conditions, resolveId }) {
+    const result = await findPackageJson(importer, moduleDirs);
+    if (!result) {
+        throw new Error(`${createBaseErrorMsg(importSpecifier, importer)}. Could not find a parent package.json.`);
     }
-
-    if (matchKey.startsWith(expansionKey)) {
-      const target = matchObj[expansionKey];
-      const subpath = matchKey.substring(expansionKey.length);
-
-      const resolved = await resolvePackageTarget(context, { target, subpath, internal });
-      return resolved;
+    const { pkgPath, pkgJsonPath, pkgJson } = result;
+    const pkgURL = pathToFileURL(`${pkgPath}/`);
+    const context = {
+        importer,
+        importSpecifier,
+        moduleDirs,
+        pkgURL,
+        pkgJsonPath,
+        conditions,
+        resolveId
+    };
+    // Assert: specifier begins with "#".
+    if (!importSpecifier.startsWith('#')) {
+        throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
     }
-  }
-
-  throw new InvalidModuleSpecifierError(context, internal);
-}
-
-async function resolvePackageExports(context, subpath, exports) {
-  if (isMixedExports(exports)) {
-    throw new InvalidConfigurationError(
-      context,
-      'All keys must either start with ./, or without one.'
-    );
-  }
-
-  if (subpath === '.') {
-    let mainExport;
-    // If exports is a String or Array, or an Object containing no keys starting with ".", then
-    if (typeof exports === 'string' || Array.isArray(exports) || isConditions(exports)) {
-      mainExport = exports;
-    } else if (isMappings(exports)) {
-      mainExport = exports['.'];
+    // If specifier is exactly equal to "#" or starts with "#/", then
+    if (importSpecifier === '#' || importSpecifier.startsWith('#/')) {
+        // Throw an Invalid Module Specifier error.
+        throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
     }
-
-    if (mainExport) {
-      const resolved = await resolvePackageTarget(context, { target: mainExport, subpath: '' });
-      if (resolved) {
-        return resolved;
-      }
+    const { imports } = pkgJson;
+    if (!imports) {
+        throw new InvalidModuleSpecifierError(context, true);
     }
-  } else if (isMappings(exports)) {
-    const resolvedMatch = await resolvePackageImportsExports(context, {
-      matchKey: subpath,
-      matchObj: exports
+    // Let packageURL be the result of LOOKUP_PACKAGE_SCOPE(parentURL).
+    // If packageURL is not null, then
+    return resolvePackageImportsExports(context, {
+        matchKey: importSpecifier,
+        matchObj: imports,
+        isImports: true
     });
-
-    if (resolvedMatch) {
-      return resolvedMatch;
-    }
-  }
-
-  throw new InvalidModuleSpecifierError(context);
 }
 
-async function resolvePackageImports({
-  importSpecifier,
-  importer,
-  moduleDirs,
-  conditions,
-  resolveId
-}) {
-  const result = await findPackageJson(importer, moduleDirs);
-  if (!result) {
-    throw new Error(createBaseErrorMsg('. Could not find a parent package.json.'));
-  }
-
-  const { pkgPath, pkgJsonPath, pkgJson } = result;
-  const pkgURL = pathToFileURL(`${pkgPath}/`);
-  const context = {
-    importer,
-    importSpecifier,
-    moduleDirs,
-    pkgURL,
-    pkgJsonPath,
-    conditions,
-    resolveId
-  };
-
-  const { imports } = pkgJson;
-  if (!imports) {
-    throw new InvalidModuleSpecifierError(context, true);
-  }
-
-  if (importSpecifier === '#' || importSpecifier.startsWith('#/')) {
-    throw new InvalidModuleSpecifierError(context, true, 'Invalid import specifier.');
-  }
-
-  return resolvePackageImportsExports(context, {
-    matchKey: importSpecifier,
-    matchObj: imports,
-    internal: true
-  });
-}
-
 const resolveImportPath = promisify(resolve$1);
@@ -711,3 +779,4 @@ const readFile = promisify(fs.readFile);
   rootDir,
-  ignoreSideEffectsForRoot
+  ignoreSideEffectsForRoot,
+  allowExportsFolderMapping
 }) {
@@ -801,2 +870,3 @@ if (importSpecifier.startsWith('#')) {
         pkgJsonPath,
+        allowExportsFolderMapping,
         conditions: exportConditions
@@ -882,3 +952,4 @@ };
   rootDir,
-  ignoreSideEffectsForRoot
+  ignoreSideEffectsForRoot,
+  allowExportsFolderMapping
 }) {
@@ -899,3 +970,4 @@ try {
       rootDir,
-      ignoreSideEffectsForRoot
+      ignoreSideEffectsForRoot,
+      allowExportsFolderMapping
     });
@@ -987,3 +1059,5 @@ if (exportMapRes) return exportMapRes;
   moduleDirectories: ['node_modules'],
-  ignoreSideEffectsForRoot: false
+  ignoreSideEffectsForRoot: false,
+  // TODO: set to false in next major release or remove
+  allowExportsFolderMapping: true
 };
@@ -1134,3 +1208,4 @@ const DEFAULTS = deepFreeze(deepMerge({}, defaults));
       rootDir,
-      ignoreSideEffectsForRoot
+      ignoreSideEffectsForRoot,
+      allowExportsFolderMapping: options.allowExportsFolderMapping
     });
@@ -1137,0 +1212,0 @@

package.json

 {
   "name": "@rollup/plugin-node-resolve",
-  "version": "15.2.0",
+  "version": "15.2.1",
   "publishConfig": {
@@ -5,0 +5,0 @@ "access": "public"

README.md

@@ -178,2 +178,27 @@ [npm]: https://img.shields.io/npm/v/@rollup/plugin-node-resolve
 
+### `allowExportsFolderMapping`
+
+Older Node versions supported exports mappings of folders like
+
+```json
+{
+  "exports": {
+    "./foo/": "./dist/foo/"
+  }
+}
+```
+
+This was deprecated with Node 14 and removed in Node 17, instead it is recommended to use exports patterns like
+
+```json
+{
+  "exports": {
+    "./foo/*": "./dist/foo/*"
+  }
+}
+```
+
+But for backwards compatibility this behavior is still supported by enabling the `allowExportsFolderMapping` (defaults to `true`).
+The default value might change in a futur major release.
+
 ## Preserving symlinks
@@ -180,0 +205,0 @@

types/index.d.ts

@@ -99,2 +99,10 @@ import type { Plugin } from 'rollup';
   rootDir?: string;
+
+  /**
+   * Allow folder mappings in package exports (trailing /)
+   * This was deprecated in Node 14 and removed with Node 17, see DEP0148.
+   * So this option might be changed to default to `false` in a future release.
+   * @default true
+   */
+  allowExportsFolderMapping?: boolean;
 }
@@ -101,0 +109,0 @@

New alerts

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Found 1 instance in 1 package

Fixed alerts

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Improved metrics

Total package byte prevSize

107511

increased by19.1%

Lines of code

2581

increased by10.58%

Number of lines in readme file

286

increased by9.58%

No dependency changes