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More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","'use strict';\r\nconst fs = require('fs').promises;\r\nconst path = require('path');\r\nconst { promisify } = require('util');\r\nconst async = require('async');\r\nconst parsePackageString = require('npm-package-arg');\r\nconst enhancedResolve = require('enhanced-resolve');\r\nconst acorn = require('acorn');\r\nconst walker = require('acorn-walk');\r\nconst types = require('ast-module-types');\r\nconst InstallationUtils = require('./utils/installation-utils');\r\nconst getNodeEcmaVersion = require('./get-node-ecma-version');\r\nconst { MIN_ECMA_VERSION, DEFAULT_MAX_THREADS } = require('./constants');\r\n\r\nconst DEFAULT_RESOLVER_OPTIONS = {\r\n mainFields: ['module', 'browser', 'main'],\r\n conditionNames: ['browser'],\r\n};\r\nconst DEFAULT_PARSER_OPTIONS = {\r\n ecmaVersion: 2020,\r\n allowImportExportEverywhere: true,\r\n allowHashBang: true,\r\n};\r\n\r\nfunction getNodeDependency(node) {\r\n switch (node.type) {\r\n case 'ImportDeclaration':\r\n case 'ExportNamedDeclaration':\r\n case 'ExportAllDeclaration':\r\n if (node.source && node.source.value) {\r\n return node.source.value;\r\n }\r\n break;\r\n case 'CallExpression':\r\n if (types.isPlainRequire(node)) {\r\n if (\r\n node.arguments[0].type === 'Literal' ||\r\n node.arguments[0].type === 'StringLiteral'\r\n ) {\r\n return node.arguments[0].value;\r\n } else if (node.arguments[0].type === 'TemplateLiteral') {\r\n return node.arguments[0].quasis[0].value.raw;\r\n }\r\n } else if (types.isMainScopedRequire(node)) {\r\n return node.arguments[0].value;\r\n }\r\n }\r\n}\r\n\r\n/**\r\n * Determines whether a given ecma version is considered modern\r\n * @param ecmaVersion The given ecma version\r\n * @return {boolean} True if the ecma version is >5. False otherwise.\r\n */\r\nfunction isEcmaVersionModern(ecmaVersion) {\r\n return ecmaVersion > 5;\r\n}\r\n\r\n/**\r\n * Determines the ecma version of a string of source code or AST\r\n * @param {String|Object} content The source code or AST to inspect\r\n * @return {Number} The ecma version of the source code or AST\r\n */\r\nfunction getEcmaVersion(content) {\r\n let ecmaVersion = MIN_ECMA_VERSION;\r\n const ast =\r\n typeof content === 'object'\r\n ? content\r\n : acorn.parse(content, DEFAULT_PARSER_OPTIONS);\r\n walker.full(ast, function (node) {\r\n ecmaVersion = Math.max(ecmaVersion, getNodeEcmaVersion(node));\r\n });\r\n return ecmaVersion;\r\n}\r\n\r\n/**\r\n * Determines the ecma version of an entry point and its dependency tree\r\n * @param {String} entryPoint An absolute filepath to an entry point\r\n * @param {Object} resolverOptions The resolver options for resolving entry points\r\n * @param {Set} visited A set of visited entry points\r\n * @return {Promise} The ecma version of the entry point and its dependency tree\r\n */\r\nasync function getEntryPointEcmaVersion(\r\n entryPoint,\r\n resolverOptions = DEFAULT_RESOLVER_OPTIONS,\r\n visited = new Set()\r\n) {\r\n if (visited.has(entryPoint) || entryPoint.endsWith('.json')) {\r\n return -1;\r\n }\r\n visited.add(entryPoint);\r\n\r\n let entryEcmaVersion = MIN_ECMA_VERSION;\r\n let dependencies = [];\r\n\r\n const code = await fs.readFile(entryPoint, 'utf8');\r\n const ast = acorn.parse(code, DEFAULT_PARSER_OPTIONS);\r\n\r\n walker.full(ast, function (node) {\r\n entryEcmaVersion = Math.max(entryEcmaVersion, getNodeEcmaVersion(node));\r\n const dependency = getNodeDependency(node);\r\n if (dependency && dependency.startsWith('.')) {\r\n dependencies.push(dependency);\r\n }\r\n });\r\n\r\n const resolve = promisify(enhancedResolve.create(resolverOptions));\r\n const dependencyEcmaVersions = await async.mapLimit(\r\n dependencies,\r\n DEFAULT_MAX_THREADS,\r\n async (dependency) => {\r\n const dependencyPath = await resolve(\r\n path.dirname(entryPoint),\r\n dependency\r\n );\r\n return await getEntryPointEcmaVersion(\r\n dependencyPath,\r\n resolverOptions,\r\n visited\r\n );\r\n }\r\n );\r\n return Math.max(entryEcmaVersion, ...dependencyEcmaVersions);\r\n}\r\n\r\n/**\r\n * Returns the ecma version of an entry point of a package\r\n * @param {String} packagePath An absolute filepath to a package\r\n * @param {Object} resolverOptions The resolver options for resolving entry points\r\n * @return {Promise} The ecma version of the entry point and its dependency tree\r\n */\r\nasync function getLocalPackageEcmaVersion(\r\n packagePath,\r\n resolverOptions = DEFAULT_RESOLVER_OPTIONS\r\n) {\r\n const resolve = promisify(enhancedResolve.create(resolverOptions));\r\n const entryPoint = await resolve(packagePath, '.');\r\n return await getEntryPointEcmaVersion(entryPoint, resolverOptions);\r\n}\r\n\r\n/**\r\n * Returns the ecma version of an entry point of a package installed from npm\r\n * @param {String} packageString A string representing the package. e.g. preact@10.4.7\r\n * @param {Object} resolverOptions The resolver options for resolving entry points\r\n * @return {Promise} The ecma version of the entry point and its dependency tree\r\n */\r\nasync function getPackageEcmaVersion(\r\n packageString,\r\n resolverOptions = DEFAULT_RESOLVER_OPTIONS\r\n) {\r\n const installPath = await InstallationUtils.getInstallPath();\r\n await InstallationUtils.installPackage(packageString, installPath);\r\n\r\n const packageName = parsePackageString(packageString).name;\r\n const packagePath = path.join(installPath, 'node_modules', packageName);\r\n const ecmaVersion = await getLocalPackageEcmaVersion(\r\n packagePath,\r\n resolverOptions\r\n );\r\n\r\n await InstallationUtils.cleanupPath(installPath);\r\n return ecmaVersion;\r\n}\r\n\r\nmodule.exports = {\r\n getEcmaVersion,\r\n getEntryPointEcmaVersion,\r\n getPackageEcmaVersion,\r\n getLocalPackageEcmaVersion,\r\n isEcmaVersionModern,\r\n};\r\n"]}