116 lines
3.2 KiB
JavaScript
116 lines
3.2 KiB
JavaScript
/**
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* @fileoverview Rule to check multiple var declarations per line
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* @author Alberto Rodríguez
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* @deprecated in ESLint v8.53.0
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*/
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'use strict';
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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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deprecated: {
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message: 'Formatting rules are being moved out of ESLint core.',
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url: 'https://eslint.org/blog/2023/10/deprecating-formatting-rules/',
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deprecatedSince: '8.53.0',
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availableUntil: '10.0.0',
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replacedBy: [
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{
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message:
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'ESLint Stylistic now maintains deprecated stylistic core rules.',
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url: 'https://eslint.style/guide/migration',
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plugin: {
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name: '@stylistic/eslint-plugin-js',
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url: 'https://eslint.style/packages/js',
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},
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rule: {
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name: 'one-var-declaration-per-line',
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url: 'https://eslint.style/rules/js/one-var-declaration-per-line',
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},
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},
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],
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},
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type: 'suggestion',
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docs: {
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description: 'Require or disallow newlines around variable declarations',
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recommended: false,
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url: 'https://eslint.org/docs/latest/rules/one-var-declaration-per-line',
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},
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schema: [
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{
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enum: ['always', 'initializations'],
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},
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],
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fixable: 'whitespace',
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messages: {
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expectVarOnNewline: 'Expected variable declaration to be on a new line.',
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},
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},
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create(context) {
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const always = context.options[0] === 'always';
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Determine if provided keyword is a variant of for specifiers
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* @private
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* @param {string} keyword keyword to test
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* @returns {boolean} True if `keyword` is a variant of for specifier
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*/
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function isForTypeSpecifier(keyword) {
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return (
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keyword === 'ForStatement' ||
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keyword === 'ForInStatement' ||
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keyword === 'ForOfStatement'
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);
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}
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/**
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* Checks newlines around variable declarations.
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* @private
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* @param {ASTNode} node `VariableDeclaration` node to test
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* @returns {void}
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*/
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function checkForNewLine(node) {
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if (isForTypeSpecifier(node.parent.type)) {
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return;
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}
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const declarations = node.declarations;
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let prev;
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declarations.forEach((current) => {
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if (prev && prev.loc.end.line === current.loc.start.line) {
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if (always || prev.init || current.init) {
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context.report({
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node,
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messageId: 'expectVarOnNewline',
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loc: current.loc,
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fix: (fixer) => fixer.insertTextBefore(current, '\n'),
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});
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}
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}
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prev = current;
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});
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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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VariableDeclaration: checkForNewLine,
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};
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},
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};
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