104 lines
2.3 KiB
JavaScript
Executable File
104 lines
2.3 KiB
JavaScript
Executable File
/**
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* @fileoverview require default case in switch statements
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* @author Aliaksei Shytkin
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*/
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"use strict";
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const DEFAULT_COMMENT_PATTERN = /^no default$/iu;
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../types').Rule.RuleModule} */
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module.exports = {
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meta: {
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type: "suggestion",
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defaultOptions: [{}],
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docs: {
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description: "Require `default` cases in `switch` statements",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/default-case",
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},
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schema: [
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{
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type: "object",
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properties: {
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commentPattern: {
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type: "string",
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},
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},
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additionalProperties: false,
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},
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],
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messages: {
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missingDefaultCase: "Expected a default case.",
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},
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},
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create(context) {
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const [options] = context.options;
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const commentPattern = options.commentPattern
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? new RegExp(options.commentPattern, "u")
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: DEFAULT_COMMENT_PATTERN;
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const sourceCode = context.sourceCode;
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Shortcut to get last element of array
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* @param {*[]} collection Array
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* @returns {any} Last element
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*/
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function last(collection) {
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return collection.at(-1);
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}
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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SwitchStatement(node) {
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if (!node.cases.length) {
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/*
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* skip check of empty switch because there is no easy way
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* to extract comments inside it now
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*/
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return;
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}
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const hasDefault = node.cases.some(v => v.test === null);
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if (!hasDefault) {
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let comment;
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const lastCase = last(node.cases);
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const comments = sourceCode.getCommentsAfter(lastCase);
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if (comments.length) {
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comment = last(comments);
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}
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if (
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!comment ||
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!commentPattern.test(comment.value.trim())
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) {
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context.report({
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node,
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messageId: "missingDefaultCase",
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});
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}
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}
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},
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};
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},
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};
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