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/**
* @fileoverview Shared functions to work with configs.
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Typedefs
//------------------------------------------------------------------------------
/**
* @import { RuleDefinition } from "@eslint/core";
* @import { Linter } from "eslint";
*/
//------------------------------------------------------------------------------
// Private Members
//------------------------------------------------------------------------------
// JSON schema that disallows passing any options
const noOptionsSchema = Object.freeze({
type: "array",
minItems: 0,
maxItems: 0,
});
//-----------------------------------------------------------------------------
// Functions
//-----------------------------------------------------------------------------
/**
* Parses a ruleId into its plugin and rule parts.
* @param {string} ruleId The rule ID to parse.
* @returns {{pluginName:string,ruleName:string}} The plugin and rule
* parts of the ruleId;
*/
function parseRuleId(ruleId) {
let pluginName, ruleName;
// distinguish between core rules and plugin rules
if (ruleId.includes("/")) {
// mimic scoped npm packages
if (ruleId.startsWith("@")) {
pluginName = ruleId.slice(0, ruleId.lastIndexOf("/"));
} else {
pluginName = ruleId.slice(0, ruleId.indexOf("/"));
}
ruleName = ruleId.slice(pluginName.length + 1);
} else {
pluginName = "@";
ruleName = ruleId;
}
return {
pluginName,
ruleName,
};
}
/**
* Retrieves a rule instance from a given config based on the ruleId.
* @param {string} ruleId The rule ID to look for.
* @param {Linter.Config} config The config to search.
* @returns {RuleDefinition|undefined} The rule if found
* or undefined if not.
*/
function getRuleFromConfig(ruleId, config) {
const { pluginName, ruleName } = parseRuleId(ruleId);
return config.plugins?.[pluginName]?.rules?.[ruleName];
}
/**
* Gets a complete options schema for a rule.
* @param {RuleDefinition} rule A rule object
* @throws {TypeError} If `meta.schema` is specified but is not an array, object or `false`.
* @returns {Object|null} JSON Schema for the rule's options. `null` if `meta.schema` is `false`.
*/
function getRuleOptionsSchema(rule) {
if (!rule.meta) {
return { ...noOptionsSchema }; // default if `meta.schema` is not specified
}
const schema = rule.meta.schema;
if (typeof schema === "undefined") {
return { ...noOptionsSchema }; // default if `meta.schema` is not specified
}
// `schema:false` is an allowed explicit opt-out of options validation for the rule
if (schema === false) {
return null;
}
if (typeof schema !== "object" || schema === null) {
throw new TypeError("Rule's `meta.schema` must be an array or object");
}
// ESLint-specific array form needs to be converted into a valid JSON Schema definition
if (Array.isArray(schema)) {
if (schema.length) {
return {
type: "array",
items: schema,
minItems: 0,
maxItems: schema.length,
};
}
// `schema:[]` is an explicit way to specify that the rule does not accept any options
return { ...noOptionsSchema };
}
// `schema:<object>` is assumed to be a valid JSON Schema definition
return schema;
}
//-----------------------------------------------------------------------------
// Exports
//-----------------------------------------------------------------------------
module.exports = {
parseRuleId,
getRuleFromConfig,
getRuleOptionsSchema,
};