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/**
* @fileoverview Flat Config Array
* @author Nicholas C. Zakas
*/
"use strict";
//-----------------------------------------------------------------------------
// Requirements
//-----------------------------------------------------------------------------
const { ConfigArray, ConfigArraySymbol } = require("@humanwhocodes/config-array");
const { flatConfigSchema } = require("./flat-config-schema");
const { RuleValidator } = require("./rule-validator");
const { defaultConfig } = require("./default-config");
const recommendedConfig = require("../../conf/eslint-recommended");
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const ruleValidator = new RuleValidator();
/**
* Splits a plugin identifier in the form a/b/c into two parts: a/b and c.
* @param {string} identifier The identifier to parse.
* @returns {{objectName: string, pluginName: string}} The parts of the plugin
* name.
*/
function splitPluginIdentifier(identifier) {
const parts = identifier.split("/");
return {
objectName: parts.pop(),
pluginName: parts.join("/")
};
}
const originalBaseConfig = Symbol("originalBaseConfig");
//-----------------------------------------------------------------------------
// Exports
//-----------------------------------------------------------------------------
/**
* Represents an array containing configuration information for ESLint.
*/
class FlatConfigArray extends ConfigArray {
/**
* Creates a new instance.
* @param {*[]} configs An array of configuration information.
* @param {{basePath: string, shouldIgnore: boolean, baseConfig: FlatConfig}} options The options
* to use for the config array instance.
*/
constructor(configs, {
basePath,
shouldIgnore = true,
baseConfig = defaultConfig
} = {}) {
super(configs, {
basePath,
schema: flatConfigSchema
});
if (baseConfig[Symbol.iterator]) {
this.unshift(...baseConfig);
} else {
this.unshift(baseConfig);
}
/**
* The baes config used to build the config array.
* @type {Array<FlatConfig>}
*/
this[originalBaseConfig] = baseConfig;
Object.defineProperty(this, originalBaseConfig, { writable: false });
/**
* Determines if `ignores` fields should be honored.
* If true, then all `ignores` fields are honored.
* if false, then only `ignores` fields in the baseConfig are honored.
* @type {boolean}
*/
this.shouldIgnore = shouldIgnore;
Object.defineProperty(this, "shouldIgnore", { writable: false });
}
/* eslint-disable class-methods-use-this -- Desired as instance method */
/**
* Replaces a config with another config to allow us to put strings
* in the config array that will be replaced by objects before
* normalization.
* @param {Object} config The config to preprocess.
* @returns {Object} The preprocessed config.
*/
[ConfigArraySymbol.preprocessConfig](config) {
if (config === "eslint:recommended") {
return recommendedConfig;
}
if (config === "eslint:all") {
/*
* Load `eslint-all.js` here instead of at the top level to avoid loading all rule modules
* when it isn't necessary. `eslint-all.js` reads `meta` of rule objects to filter out deprecated ones,
* so requiring `eslint-all.js` module loads all rule modules as a consequence.
*/
return require("../../conf/eslint-all");
}
/*
* If `shouldIgnore` is false, we remove any ignore patterns specified
* in the config so long as it's not a default config and it doesn't
* have a `files` entry.
*/
if (
!this.shouldIgnore &&
!this[originalBaseConfig].includes(config) &&
config.ignores &&
!config.files
) {
/* eslint-disable-next-line no-unused-vars -- need to strip off other keys */
const { ignores, ...otherKeys } = config;
return otherKeys;
}
return config;
}
/**
* Finalizes the config by replacing plugin references with their objects
* and validating rule option schemas.
* @param {Object} config The config to finalize.
* @returns {Object} The finalized config.
* @throws {TypeError} If the config is invalid.
*/
[ConfigArraySymbol.finalizeConfig](config) {
const { plugins, languageOptions, processor } = config;
let parserName, processorName;
let invalidParser = false,
invalidProcessor = false;
// Check parser value
if (languageOptions && languageOptions.parser) {
if (typeof languageOptions.parser === "string") {
const { pluginName, objectName: localParserName } = splitPluginIdentifier(languageOptions.parser);
parserName = languageOptions.parser;
if (!plugins || !plugins[pluginName] || !plugins[pluginName].parsers || !plugins[pluginName].parsers[localParserName]) {
throw new TypeError(`Key "parser": Could not find "${localParserName}" in plugin "${pluginName}".`);
}
languageOptions.parser = plugins[pluginName].parsers[localParserName];
} else {
invalidParser = true;
}
}
// Check processor value
if (processor) {
if (typeof processor === "string") {
const { pluginName, objectName: localProcessorName } = splitPluginIdentifier(processor);
processorName = processor;
if (!plugins || !plugins[pluginName] || !plugins[pluginName].processors || !plugins[pluginName].processors[localProcessorName]) {
throw new TypeError(`Key "processor": Could not find "${localProcessorName}" in plugin "${pluginName}".`);
}
config.processor = plugins[pluginName].processors[localProcessorName];
} else {
invalidProcessor = true;
}
}
ruleValidator.validate(config);
// apply special logic for serialization into JSON
/* eslint-disable object-shorthand -- shorthand would change "this" value */
Object.defineProperty(config, "toJSON", {
value: function() {
if (invalidParser) {
throw new Error("Caching is not supported when parser is an object.");
}
if (invalidProcessor) {
throw new Error("Caching is not supported when processor is an object.");
}
return {
...this,
plugins: Object.keys(plugins),
languageOptions: {
...languageOptions,
parser: parserName
},
processor: processorName
};
}
});
/* eslint-enable object-shorthand -- ok to enable now */
return config;
}
/* eslint-enable class-methods-use-this -- Desired as instance method */
}
exports.FlatConfigArray = FlatConfigArray;
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