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380 lines
12 KiB
380 lines
12 KiB
/**
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* @fileoverview Flat Config Array
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//-----------------------------------------------------------------------------
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// Requirements
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//-----------------------------------------------------------------------------
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const { ConfigArray, ConfigArraySymbol } = require("@humanwhocodes/config-array");
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const { flatConfigSchema } = require("./flat-config-schema");
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const { RuleValidator } = require("./rule-validator");
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const { defaultConfig } = require("./default-config");
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const jsPlugin = require("@eslint/js");
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//-----------------------------------------------------------------------------
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// Helpers
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//-----------------------------------------------------------------------------
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/**
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* Fields that are considered metadata and not part of the config object.
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*/
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const META_FIELDS = new Set(["name"]);
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const ruleValidator = new RuleValidator();
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/**
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* Splits a plugin identifier in the form a/b/c into two parts: a/b and c.
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* @param {string} identifier The identifier to parse.
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* @returns {{objectName: string, pluginName: string}} The parts of the plugin
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* name.
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*/
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function splitPluginIdentifier(identifier) {
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const parts = identifier.split("/");
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return {
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objectName: parts.pop(),
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pluginName: parts.join("/")
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};
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}
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/**
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* Returns the name of an object in the config by reading its `meta` key.
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* @param {Object} object The object to check.
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* @returns {string?} The name of the object if found or `null` if there
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* is no name.
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*/
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function getObjectId(object) {
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// first check old-style name
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let name = object.name;
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if (!name) {
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if (!object.meta) {
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return null;
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}
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name = object.meta.name;
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if (!name) {
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return null;
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}
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}
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// now check for old-style version
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let version = object.version;
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if (!version) {
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version = object.meta && object.meta.version;
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}
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// if there's a version then append that
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if (version) {
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return `${name}@${version}`;
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}
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return name;
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}
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/**
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* Wraps a config error with details about where the error occurred.
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* @param {Error} error The original error.
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* @param {number} originalLength The original length of the config array.
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* @param {number} baseLength The length of the base config.
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* @returns {TypeError} The new error with details.
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*/
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function wrapConfigErrorWithDetails(error, originalLength, baseLength) {
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let location = "user-defined";
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let configIndex = error.index;
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/*
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* A config array is set up in this order:
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* 1. Base config
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* 2. Original configs
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* 3. User-defined configs
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* 4. CLI-defined configs
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*
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* So we need to adjust the index to account for the base config.
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*
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* - If the index is less than the base length, it's in the base config
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* (as specified by `baseConfig` argument to `FlatConfigArray` constructor).
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* - If the index is greater than the base length but less than the original
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* length + base length, it's in the original config. The original config
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* is passed to the `FlatConfigArray` constructor as the first argument.
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* - Otherwise, it's in the user-defined config, which is loaded from the
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* config file and merged with any command-line options.
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*/
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if (error.index < baseLength) {
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location = "base";
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} else if (error.index < originalLength + baseLength) {
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location = "original";
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configIndex = error.index - baseLength;
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} else {
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configIndex = error.index - originalLength - baseLength;
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}
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return new TypeError(
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`${error.message.slice(0, -1)} at ${location} index ${configIndex}.`,
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{ cause: error }
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);
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}
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const originalBaseConfig = Symbol("originalBaseConfig");
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const originalLength = Symbol("originalLength");
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const baseLength = Symbol("baseLength");
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//-----------------------------------------------------------------------------
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// Exports
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//-----------------------------------------------------------------------------
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/**
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* Represents an array containing configuration information for ESLint.
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*/
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class FlatConfigArray extends ConfigArray {
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/**
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* Creates a new instance.
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* @param {*[]} configs An array of configuration information.
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* @param {{basePath: string, shouldIgnore: boolean, baseConfig: FlatConfig}} options The options
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* to use for the config array instance.
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*/
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constructor(configs, {
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basePath,
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shouldIgnore = true,
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baseConfig = defaultConfig
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} = {}) {
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super(configs, {
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basePath,
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schema: flatConfigSchema
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});
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/**
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* The original length of the array before any modifications.
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* @type {number}
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*/
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this[originalLength] = this.length;
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if (baseConfig[Symbol.iterator]) {
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this.unshift(...baseConfig);
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} else {
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this.unshift(baseConfig);
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}
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/**
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* The length of the array after applying the base config.
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* @type {number}
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*/
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this[baseLength] = this.length - this[originalLength];
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/**
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* The base config used to build the config array.
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* @type {Array<FlatConfig>}
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*/
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this[originalBaseConfig] = baseConfig;
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Object.defineProperty(this, originalBaseConfig, { writable: false });
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/**
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* Determines if `ignores` fields should be honored.
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* If true, then all `ignores` fields are honored.
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* if false, then only `ignores` fields in the baseConfig are honored.
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* @type {boolean}
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*/
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this.shouldIgnore = shouldIgnore;
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Object.defineProperty(this, "shouldIgnore", { writable: false });
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}
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/**
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* Normalizes the array by calling the superclass method and catching/rethrowing
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* any ConfigError exceptions with additional details.
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* @param {any} [context] The context to use to normalize the array.
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* @returns {Promise<FlatConfigArray>} A promise that resolves when the array is normalized.
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*/
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normalize(context) {
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return super.normalize(context)
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.catch(error => {
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if (error.name === "ConfigError") {
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throw wrapConfigErrorWithDetails(error, this[originalLength], this[baseLength]);
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}
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throw error;
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});
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}
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/**
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* Normalizes the array by calling the superclass method and catching/rethrowing
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* any ConfigError exceptions with additional details.
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* @param {any} [context] The context to use to normalize the array.
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* @returns {FlatConfigArray} The current instance.
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* @throws {TypeError} If the config is invalid.
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*/
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normalizeSync(context) {
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try {
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return super.normalizeSync(context);
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} catch (error) {
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if (error.name === "ConfigError") {
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throw wrapConfigErrorWithDetails(error, this[originalLength], this[baseLength]);
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}
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throw error;
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}
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}
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/* eslint-disable class-methods-use-this -- Desired as instance method */
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/**
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* Replaces a config with another config to allow us to put strings
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* in the config array that will be replaced by objects before
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* normalization.
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* @param {Object} config The config to preprocess.
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* @returns {Object} The preprocessed config.
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*/
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[ConfigArraySymbol.preprocessConfig](config) {
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if (config === "eslint:recommended") {
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// if we are in a Node.js environment warn the user
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if (typeof process !== "undefined" && process.emitWarning) {
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process.emitWarning("The 'eslint:recommended' string configuration is deprecated and will be replaced by the @eslint/js package's 'recommended' config.");
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}
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return jsPlugin.configs.recommended;
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}
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if (config === "eslint:all") {
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// if we are in a Node.js environment warn the user
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if (typeof process !== "undefined" && process.emitWarning) {
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process.emitWarning("The 'eslint:all' string configuration is deprecated and will be replaced by the @eslint/js package's 'all' config.");
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}
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return jsPlugin.configs.all;
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}
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/*
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* If a config object has `ignores` and no other non-meta fields, then it's an object
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* for global ignores. If `shouldIgnore` is false, that object shouldn't apply,
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* so we'll remove its `ignores`.
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*/
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if (
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!this.shouldIgnore &&
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!this[originalBaseConfig].includes(config) &&
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config.ignores &&
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Object.keys(config).filter(key => !META_FIELDS.has(key)).length === 1
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) {
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/* eslint-disable-next-line no-unused-vars -- need to strip off other keys */
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const { ignores, ...otherKeys } = config;
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return otherKeys;
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}
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return config;
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}
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/**
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* Finalizes the config by replacing plugin references with their objects
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* and validating rule option schemas.
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* @param {Object} config The config to finalize.
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* @returns {Object} The finalized config.
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* @throws {TypeError} If the config is invalid.
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*/
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[ConfigArraySymbol.finalizeConfig](config) {
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const { plugins, languageOptions, processor } = config;
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let parserName, processorName;
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let invalidParser = false,
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invalidProcessor = false;
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// Check parser value
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if (languageOptions && languageOptions.parser) {
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const { parser } = languageOptions;
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if (typeof parser === "object") {
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parserName = getObjectId(parser);
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if (!parserName) {
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invalidParser = true;
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}
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} else {
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invalidParser = true;
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}
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}
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// Check processor value
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if (processor) {
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if (typeof processor === "string") {
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const { pluginName, objectName: localProcessorName } = splitPluginIdentifier(processor);
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processorName = processor;
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if (!plugins || !plugins[pluginName] || !plugins[pluginName].processors || !plugins[pluginName].processors[localProcessorName]) {
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throw new TypeError(`Key "processor": Could not find "${localProcessorName}" in plugin "${pluginName}".`);
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}
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config.processor = plugins[pluginName].processors[localProcessorName];
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} else if (typeof processor === "object") {
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processorName = getObjectId(processor);
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if (!processorName) {
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invalidProcessor = true;
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}
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} else {
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invalidProcessor = true;
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}
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}
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ruleValidator.validate(config);
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// apply special logic for serialization into JSON
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/* eslint-disable object-shorthand -- shorthand would change "this" value */
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Object.defineProperty(config, "toJSON", {
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value: function() {
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if (invalidParser) {
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throw new Error("Could not serialize parser object (missing 'meta' object).");
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}
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if (invalidProcessor) {
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throw new Error("Could not serialize processor object (missing 'meta' object).");
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}
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return {
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...this,
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plugins: Object.entries(plugins).map(([namespace, plugin]) => {
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const pluginId = getObjectId(plugin);
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if (!pluginId) {
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return namespace;
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}
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return `${namespace}:${pluginId}`;
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}),
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languageOptions: {
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...languageOptions,
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parser: parserName
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},
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processor: processorName
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};
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}
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});
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/* eslint-enable object-shorthand -- ok to enable now */
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return config;
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}
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/* eslint-enable class-methods-use-this -- Desired as instance method */
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}
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exports.FlatConfigArray = FlatConfigArray;
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