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/**
* @fileoverview A collection of methods for processing Espree's options.
* @author Kai Cataldo
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const DEFAULT_ECMA_VERSION = 5;
const SUPPORTED_VERSIONS = [
3,
5,
6,
7,
8,
9,
10,
11
];
/**
* Normalize ECMAScript version from the initial config
* @param {number} ecmaVersion ECMAScript version from the initial config
* @throws {Error} throws an error if the ecmaVersion is invalid.
* @returns {number} normalized ECMAScript version
*/
function normalizeEcmaVersion(ecmaVersion = DEFAULT_ECMA_VERSION) {
if (typeof ecmaVersion !== "number") {
throw new Error(`ecmaVersion must be a number. Received value of type ${typeof ecmaVersion} instead.`);
}
let version = ecmaVersion;
// Calculate ECMAScript edition number from official year version starting with
// ES2015, which corresponds with ES6 (or a difference of 2009).
if (version >= 2015) {
version -= 2009;
}
if (!SUPPORTED_VERSIONS.includes(version)) {
throw new Error("Invalid ecmaVersion.");
}
return version;
}
/**
* Normalize sourceType from the initial config
* @param {string} sourceType to normalize
* @throws {Error} throw an error if sourceType is invalid
* @returns {string} normalized sourceType
*/
function normalizeSourceType(sourceType = "script") {
if (sourceType === "script" || sourceType === "module") {
return sourceType;
}
throw new Error("Invalid sourceType.");
}
/**
* Normalize parserOptions
* @param {Object} options the parser options to normalize
* @throws {Error} throw an error if found invalid option.
* @returns {Object} normalized options
*/
function normalizeOptions(options) {
const ecmaVersion = normalizeEcmaVersion(options.ecmaVersion);
const sourceType = normalizeSourceType(options.sourceType);
const ranges = options.range === true;
const locations = options.loc === true;
if (sourceType === "module" && ecmaVersion < 6) {
throw new Error("sourceType 'module' is not supported when ecmaVersion < 2015. Consider adding `{ ecmaVersion: 2015 }` to the parser options.");
}
return Object.assign({}, options, { ecmaVersion, sourceType, ranges, locations });
}
/**
* Get the latest ECMAScript version supported by Espree.
* @returns {number} The latest ECMAScript version.
*/
function getLatestEcmaVersion() {
return SUPPORTED_VERSIONS[SUPPORTED_VERSIONS.length - 1];
}
/**
* Get the list of ECMAScript versions supported by Espree.
* @returns {number[]} An array containing the supported ECMAScript versions.
*/
function getSupportedEcmaVersions() {
return [...SUPPORTED_VERSIONS];
}
//------------------------------------------------------------------------------
// Public
//------------------------------------------------------------------------------
module.exports = {
normalizeOptions,
getLatestEcmaVersion,
getSupportedEcmaVersions
};