lib: merge cjs and esm package json reader caches

PR-URL: nodejs#48477
Reviewed-By: Jacob Smith <[email protected]>
Reviewed-By: Geoffrey Booth <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>

Author: anonrig

lib/internal/modules/cjs/loader.js

@@ -82,7 +82,6 @@ const {
   pendingDeprecate,
   emitExperimentalWarning,
   kEmptyObject,
-  filterOwnProperties,
   setOwnProperty,
   getLazy,
 } = require('internal/util');
@@ -355,36 +354,12 @@ function initializeCJS() {
 //   -> a.<ext>
 //   -> a/index.<ext>
 
-const packageJsonCache = new SafeMap();
-
+/**
+ * @param {string} requestPath
+ * @return {PackageConfig}
+ */
 function readPackage(requestPath) {
-  const jsonPath = path.resolve(requestPath, 'package.json');
-
-  const existing = packageJsonCache.get(jsonPath);
-  if (existing !== undefined) return existing;
-
-  const result = packageJsonReader.read(jsonPath);
-  const json = result.containsKeys === false ? '{}' : result.string;
-  if (json === undefined) {
-    packageJsonCache.set(jsonPath, false);
-    return false;
-  }
-
-  try {
-    const filtered = filterOwnProperties(JSONParse(json), [
-      'name',
-      'main',
-      'exports',
-      'imports',
-      'type',
-    ]);
-    packageJsonCache.set(jsonPath, filtered);
-    return filtered;
-  } catch (e) {
-    e.path = jsonPath;
-    e.message = 'Error parsing ' + jsonPath + ': ' + e.message;
-    throw e;
-  }
+  return packageJsonReader.read(path.resolve(requestPath, 'package.json'));
 }
 
 let _readPackage = readPackage;
@@ -414,7 +389,7 @@ function readPackageScope(checkPath) {
     if (StringPrototypeEndsWith(checkPath, sep + 'node_modules'))
       return false;
     const pjson = _readPackage(checkPath + sep);
-    if (pjson) return {
+    if (pjson.exists) return {
       data: pjson,
       path: checkPath,
     };
@@ -423,7 +398,7 @@ function readPackageScope(checkPath) {
 }
 
 function tryPackage(requestPath, exts, isMain, originalPath) {
-  const pkg = _readPackage(requestPath)?.main;
+  const pkg = _readPackage(requestPath).main;
 
   if (!pkg) {
     return tryExtensions(path.resolve(requestPath, 'index'), exts, isMain);
@@ -528,9 +503,10 @@ function trySelfParentPath(parent) {
 function trySelf(parentPath, request) {
   if (!parentPath) return false;
 
-  const { data: pkg, path: pkgPath } = readPackageScope(parentPath) || {};
-  if (!pkg || pkg.exports === undefined) return false;
-  if (typeof pkg.name !== 'string') return false;
+  const { data: pkg, path: pkgPath } = readPackageScope(parentPath);
+  if (!pkg || pkg.exports == null || pkg.name === undefined) {
+    return false;
+  }
 
   let expansion;
   if (request === pkg.name) {
@@ -565,7 +541,7 @@ function resolveExports(nmPath, request) {
     return;
   const pkgPath = path.resolve(nmPath, name);
   const pkg = _readPackage(pkgPath);
-  if (pkg?.exports != null) {
+  if (pkg.exists && pkg.exports != null) {
     try {
       const { packageExportsResolve } = require('internal/modules/esm/resolve');
       return finalizeEsmResolution(packageExportsResolve(
@@ -1028,7 +1004,7 @@ Module._resolveFilename = function(request, parent, isMain, options) {
 
   if (request[0] === '#' && (parent?.filename || parent?.id === '<repl>')) {
     const parentPath = parent?.filename ?? process.cwd() + path.sep;
-    const pkg = readPackageScope(parentPath) || {};
+    const pkg = readPackageScope(parentPath) || { __proto__: null };
     if (pkg.data?.imports != null) {
       try {
         const { packageImportsResolve } = require('internal/modules/esm/resolve');
@@ -1274,9 +1250,9 @@ Module._extensions['.js'] = function(module, filename) {
     content = fs.readFileSync(filename, 'utf8');
   }
   if (StringPrototypeEndsWith(filename, '.js')) {
-    const pkg = readPackageScope(filename);
+    const pkg = readPackageScope(filename) || { __proto__: null };
     // Function require shouldn't be used in ES modules.
-    if (pkg?.data?.type === 'module') {
+    if (pkg.data?.type === 'module') {
       const parent = moduleParentCache.get(module);
       const parentPath = parent?.filename;
       const packageJsonPath = path.resolve(pkg.path, 'package.json');

lib/internal/modules/esm/package_config.js

@@ -1,102 +1,10 @@
 'use strict';
 
 const {
-  JSONParse,
-  ObjectPrototypeHasOwnProperty,
-  SafeMap,
   StringPrototypeEndsWith,
 } = primordials;
 const { URL, fileURLToPath } = require('internal/url');
-const {
-  ERR_INVALID_PACKAGE_CONFIG,
-} = require('internal/errors').codes;
-
-const { filterOwnProperties } = require('internal/util');
-
-
-/**
- * @typedef {string | string[] | Record<string, unknown>} Exports
- * @typedef {'module' | 'commonjs'} PackageType
- * @typedef {{
- *   pjsonPath: string,
- *   exports?: ExportConfig,
- *   name?: string,
- *   main?: string,
- *   type?: PackageType,
- * }} PackageConfig
- */
-
-/** @type {Map<string, PackageConfig>} */
-const packageJSONCache = new SafeMap();
-
-
-/**
- * @param {string} path
- * @param {string} specifier
- * @param {string | URL | undefined} base
- * @returns {PackageConfig}
- */
-function getPackageConfig(path, specifier, base) {
-  const existing = packageJSONCache.get(path);
-  if (existing !== undefined) {
-    return existing;
-  }
-  const packageJsonReader = require('internal/modules/package_json_reader');
-  const source = packageJsonReader.read(path).string;
-  if (source === undefined) {
-    const packageConfig = {
-      pjsonPath: path,
-      exists: false,
-      main: undefined,
-      name: undefined,
-      type: 'none',
-      exports: undefined,
-      imports: undefined,
-    };
-    packageJSONCache.set(path, packageConfig);
-    return packageConfig;
-  }
-
-  let packageJSON;
-  try {
-    packageJSON = JSONParse(source);
-  } catch (error) {
-    throw new ERR_INVALID_PACKAGE_CONFIG(
-      path,
-      (base ? `"${specifier}" from ` : '') + fileURLToPath(base || specifier),
-      error.message,
-    );
-  }
-
-  let { imports, main, name, type } = filterOwnProperties(packageJSON, ['imports', 'main', 'name', 'type']);
-  const exports = ObjectPrototypeHasOwnProperty(packageJSON, 'exports') ? packageJSON.exports : undefined;
-  if (typeof imports !== 'object' || imports === null) {
-    imports = undefined;
-  }
-  if (typeof main !== 'string') {
-    main = undefined;
-  }
-  if (typeof name !== 'string') {
-    name = undefined;
-  }
-  // Ignore unknown types for forwards compatibility
-  if (type !== 'module' && type !== 'commonjs') {
-    type = 'none';
-  }
-
-  const packageConfig = {
-    pjsonPath: path,
-    exists: true,
-    main,
-    name,
-    type,
-    exports,
-    imports,
-  };
-  packageJSONCache.set(path, packageConfig);
-  return packageConfig;
-}
-
+const packageJsonReader = require('internal/modules/package_json_reader');
 
 /**
  * @param {URL | string} resolved
@@ -109,7 +17,11 @@ function getPackageScopeConfig(resolved) {
     if (StringPrototypeEndsWith(packageJSONPath, 'node_modules/package.json')) {
       break;
     }
-    const packageConfig = getPackageConfig(fileURLToPath(packageJSONUrl), resolved);
+    const packageConfig = packageJsonReader.read(fileURLToPath(packageJSONUrl), {
+      __proto__: null,
+      specifier: resolved,
+      isESM: true,
+    });
     if (packageConfig.exists) {
       return packageConfig;
     }
@@ -124,7 +36,8 @@ function getPackageScopeConfig(resolved) {
     }
   }
   const packageJSONPath = fileURLToPath(packageJSONUrl);
-  const packageConfig = {
+  return {
+    __proto__: null,
     pjsonPath: packageJSONPath,
     exists: false,
     main: undefined,
@@ -133,12 +46,9 @@ function getPackageScopeConfig(resolved) {
     exports: undefined,
     imports: undefined,
   };
-  packageJSONCache.set(packageJSONPath, packageConfig);
-  return packageConfig;
 }
 
 
 module.exports = {
-  getPackageConfig,
   getPackageScopeConfig,
 };

lib/internal/modules/esm/resolve.js

@@ -53,8 +53,9 @@ const {
 } = require('internal/errors').codes;
 
 const { Module: CJSModule } = require('internal/modules/cjs/loader');
-const { getPackageConfig, getPackageScopeConfig } = require('internal/modules/esm/package_config');
+const { getPackageScopeConfig } = require('internal/modules/esm/package_config');
 const { getConditionsSet } = require('internal/modules/esm/utils');
+const packageJsonReader = require('internal/modules/package_json_reader');
 const { internalModuleStat } = internalBinding('fs');
 
 /**
@@ -734,8 +735,7 @@ function packageResolve(specifier, base, conditions) {
   const packageConfig = getPackageScopeConfig(base);
   if (packageConfig.exists) {
     const packageJSONUrl = pathToFileURL(packageConfig.pjsonPath);
-    if (packageConfig.name === packageName &&
-        packageConfig.exports !== undefined && packageConfig.exports !== null) {
+    if (packageConfig.exports != null && packageConfig.name === packageName) {
       return packageExportsResolve(
         packageJSONUrl, packageSubpath, packageConfig, base, conditions);
     }
@@ -759,8 +759,8 @@ function packageResolve(specifier, base, conditions) {
     }
 
     // Package match.
-    const packageConfig = getPackageConfig(packageJSONPath, specifier, base);
-    if (packageConfig.exports !== undefined && packageConfig.exports !== null) {
+    const packageConfig = packageJsonReader.read(packageJSONPath, { __proto__: null, specifier, base, isESM: true });
+    if (packageConfig.exports != null) {
       return packageExportsResolve(
         packageJSONUrl, packageSubpath, packageConfig, base, conditions);
     }