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123 lines
3.8 KiB
123 lines
3.8 KiB
/**
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* @fileoverview A collection of methods for processing Espree's options.
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* @author Kai Cataldo
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*/
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const SUPPORTED_VERSIONS = [
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3,
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5,
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6, // 2015
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7, // 2016
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8, // 2017
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9, // 2018
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10, // 2019
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11, // 2020
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12, // 2021
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13, // 2022
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14, // 2023
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15 // 2024
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];
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/**
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* Get the latest ECMAScript version supported by Espree.
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* @returns {number} The latest ECMAScript version.
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*/
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export function getLatestEcmaVersion() {
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return SUPPORTED_VERSIONS[SUPPORTED_VERSIONS.length - 1];
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}
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/**
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* Get the list of ECMAScript versions supported by Espree.
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* @returns {number[]} An array containing the supported ECMAScript versions.
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*/
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export function getSupportedEcmaVersions() {
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return [...SUPPORTED_VERSIONS];
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}
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/**
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* Normalize ECMAScript version from the initial config
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* @param {(number|"latest")} ecmaVersion ECMAScript version from the initial config
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* @throws {Error} throws an error if the ecmaVersion is invalid.
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* @returns {number} normalized ECMAScript version
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*/
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function normalizeEcmaVersion(ecmaVersion = 5) {
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let version = ecmaVersion === "latest" ? getLatestEcmaVersion() : ecmaVersion;
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if (typeof version !== "number") {
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throw new Error(`ecmaVersion must be a number or "latest". Received value of type ${typeof ecmaVersion} instead.`);
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}
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// Calculate ECMAScript edition number from official year version starting with
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// ES2015, which corresponds with ES6 (or a difference of 2009).
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if (version >= 2015) {
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version -= 2009;
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}
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if (!SUPPORTED_VERSIONS.includes(version)) {
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throw new Error("Invalid ecmaVersion.");
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}
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return version;
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}
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/**
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* Normalize sourceType from the initial config
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* @param {string} sourceType to normalize
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* @throws {Error} throw an error if sourceType is invalid
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* @returns {string} normalized sourceType
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*/
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function normalizeSourceType(sourceType = "script") {
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if (sourceType === "script" || sourceType === "module") {
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return sourceType;
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}
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if (sourceType === "commonjs") {
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return "script";
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}
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throw new Error("Invalid sourceType.");
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}
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/**
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* Normalize parserOptions
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* @param {Object} options the parser options to normalize
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* @throws {Error} throw an error if found invalid option.
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* @returns {Object} normalized options
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*/
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export function normalizeOptions(options) {
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const ecmaVersion = normalizeEcmaVersion(options.ecmaVersion);
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const sourceType = normalizeSourceType(options.sourceType);
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const ranges = options.range === true;
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const locations = options.loc === true;
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if (ecmaVersion !== 3 && options.allowReserved) {
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// a value of `false` is intentionally allowed here, so a shared config can overwrite it when needed
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throw new Error("`allowReserved` is only supported when ecmaVersion is 3");
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}
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if (typeof options.allowReserved !== "undefined" && typeof options.allowReserved !== "boolean") {
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throw new Error("`allowReserved`, when present, must be `true` or `false`");
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}
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const allowReserved = ecmaVersion === 3 ? (options.allowReserved || "never") : false;
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const ecmaFeatures = options.ecmaFeatures || {};
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const allowReturnOutsideFunction = options.sourceType === "commonjs" ||
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Boolean(ecmaFeatures.globalReturn);
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if (sourceType === "module" && ecmaVersion < 6) {
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throw new Error("sourceType 'module' is not supported when ecmaVersion < 2015. Consider adding `{ ecmaVersion: 2015 }` to the parser options.");
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}
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return Object.assign({}, options, {
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ecmaVersion,
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sourceType,
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ranges,
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locations,
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allowReserved,
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allowReturnOutsideFunction
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});
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}
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