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accessor-pairs.js
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array-bracket-newline.js
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array-bracket-spacing.js
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array-callback-return.js
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array-element-newline.js
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arrow-body-style.js
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arrow-parens.js
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arrow-spacing.js
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block-scoped-var.js
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block-spacing.js
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brace-style.js
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callback-return.js
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camelcase.js
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capitalized-comments.js
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class-methods-use-this.js
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comma-dangle.js
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comma-spacing.js
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comma-style.js
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complexity.js
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computed-property-spacing.js
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consistent-return.js
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consistent-this.js
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curly.js
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default-case-last.js
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default-case.js
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default-param-last.js
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dot-location.js
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dot-notation.js
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eol-last.js
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eqeqeq.js
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for-direction.js
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func-call-spacing.js
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func-name-matching.js
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func-names.js
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func-style.js
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function-paren-newline.js
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generator-star-spacing.js
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getter-return.js
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global-require.js
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grouped-accessor-pairs.js
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guard-for-in.js
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handle-callback-err.js
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id-blacklist.js
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id-denylist.js
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id-length.js
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id-match.js
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implicit-arrow-linebreak.js
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indent-legacy.js
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indent.js
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index.js
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init-declarations.js
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jsx-quotes.js
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key-spacing.js
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keyword-spacing.js
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line-comment-position.js
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linebreak-style.js
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lines-around-comment.js
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lines-around-directive.js
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lines-between-class-members.js
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logical-assignment-operators.j...
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max-classes-per-file.js
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max-depth.js
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max-nested-callbacks.js
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max-params.js
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max-statements.js
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multiline-comment-style.js
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multiline-ternary.js
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new-cap.js
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new-parens.js
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newline-before-return.js
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newline-per-chained-call.js
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no-alert.js
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no-array-constructor.js
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no-await-in-loop.js
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no-continue.js
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no-control-regex.js
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no-debugger.js
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no-delete-var.js
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no-div-regex.js
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no-dupe-args.js
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no-dupe-class-members.js
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no-dupe-else-if.js
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no-dupe-keys.js
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no-duplicate-case.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-character-class.js
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no-empty-function.js
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no-empty-pattern.js
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no-empty-static-block.js
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no-empty.js
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no-eq-null.js
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no-eval.js
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no-ex-assign.js
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no-extend-native.js
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no-extra-bind.js
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no-extra-boolean-cast.js
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no-extra-label.js
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no-extra-parens.js
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no-extra-semi.js
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no-fallthrough.js
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no-floating-decimal.js
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no-func-assign.js
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no-global-assign.js
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no-implicit-coercion.js
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no-implicit-globals.js
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no-implied-eval.js
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no-import-assign.js
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no-inline-comments.js
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no-inner-declarations.js
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no-invalid-regexp.js
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no-invalid-this.js
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no-irregular-whitespace.js
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no-iterator.js
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no-label-var.js
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no-labels.js
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no-lone-blocks.js
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no-lonely-if.js
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no-loop-func.js
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no-loss-of-precision.js
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no-magic-numbers.js
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no-mixed-operators.js
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no-mixed-requires.js
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no-mixed-spaces-and-tabs.js
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no-multi-assign.js
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no-multi-spaces.js
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no-multi-str.js
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no-multiple-empty-lines.js
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no-native-reassign.js
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no-negated-condition.js
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no-negated-in-lhs.js
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no-nested-ternary.js
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no-new-func.js
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no-new-object.js
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no-new-require.js
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no-new-symbol.js
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no-new.js
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no-nonoctal-decimal-escape.js
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no-obj-calls.js
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no-object-constructor.js
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no-param-reassign.js
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no-process-env.js
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no-promise-executor-return.js
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no-restricted-exports.js
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no-shadow-restricted-names.js
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no-ternary.js
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no-useless-call.js
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no-useless-computed-key.js
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no-useless-rename.js
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no-var.js
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no-void.js
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object-curly-spacing.js
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object-property-newline.js
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object-shorthand.js
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one-var.js
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operator-assignment.js
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operator-linebreak.js
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prefer-template.js
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quotes.js
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radix.js
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require-await.js
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require-yield.js
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rest-spread-spacing.js
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semi-spacing.js
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semi.js
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strict.js
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symbol-description.js
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vars-on-top.js
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wrap-iife.js
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Code Editor : one-var.js
/** * @fileoverview A rule to control the use of single variable declarations. * @author Ian Christian Myers */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Determines whether the given node is in a statement list. * @param {ASTNode} node node to check * @returns {boolean} `true` if the given node is in a statement list */ function isInStatementList(node) { return astUtils.STATEMENT_LIST_PARENTS.has(node.parent.type); } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Enforce variables to be declared either together or separately in functions", recommended: false, url: "https://eslint.org/docs/latest/rules/one-var" }, fixable: "code", schema: [ { oneOf: [ { enum: ["always", "never", "consecutive"] }, { type: "object", properties: { separateRequires: { type: "boolean" }, var: { enum: ["always", "never", "consecutive"] }, let: { enum: ["always", "never", "consecutive"] }, const: { enum: ["always", "never", "consecutive"] } }, additionalProperties: false }, { type: "object", properties: { initialized: { enum: ["always", "never", "consecutive"] }, uninitialized: { enum: ["always", "never", "consecutive"] } }, additionalProperties: false } ] } ], messages: { combineUninitialized: "Combine this with the previous '{{type}}' statement with uninitialized variables.", combineInitialized: "Combine this with the previous '{{type}}' statement with initialized variables.", splitUninitialized: "Split uninitialized '{{type}}' declarations into multiple statements.", splitInitialized: "Split initialized '{{type}}' declarations into multiple statements.", splitRequires: "Split requires to be separated into a single block.", combine: "Combine this with the previous '{{type}}' statement.", split: "Split '{{type}}' declarations into multiple statements." } }, create(context) { const MODE_ALWAYS = "always"; const MODE_NEVER = "never"; const MODE_CONSECUTIVE = "consecutive"; const mode = context.options[0] || MODE_ALWAYS; const options = {}; if (typeof mode === "string") { // simple options configuration with just a string options.var = { uninitialized: mode, initialized: mode }; options.let = { uninitialized: mode, initialized: mode }; options.const = { uninitialized: mode, initialized: mode }; } else if (typeof mode === "object") { // options configuration is an object options.separateRequires = !!mode.separateRequires; options.var = { uninitialized: mode.var, initialized: mode.var }; options.let = { uninitialized: mode.let, initialized: mode.let }; options.const = { uninitialized: mode.const, initialized: mode.const }; if (Object.prototype.hasOwnProperty.call(mode, "uninitialized")) { options.var.uninitialized = mode.uninitialized; options.let.uninitialized = mode.uninitialized; options.const.uninitialized = mode.uninitialized; } if (Object.prototype.hasOwnProperty.call(mode, "initialized")) { options.var.initialized = mode.initialized; options.let.initialized = mode.initialized; options.const.initialized = mode.initialized; } } const sourceCode = context.sourceCode; //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- const functionStack = []; const blockStack = []; /** * Increments the blockStack counter. * @returns {void} * @private */ function startBlock() { blockStack.push({ let: { initialized: false, uninitialized: false }, const: { initialized: false, uninitialized: false } }); } /** * Increments the functionStack counter. * @returns {void} * @private */ function startFunction() { functionStack.push({ initialized: false, uninitialized: false }); startBlock(); } /** * Decrements the blockStack counter. * @returns {void} * @private */ function endBlock() { blockStack.pop(); } /** * Decrements the functionStack counter. * @returns {void} * @private */ function endFunction() { functionStack.pop(); endBlock(); } /** * Check if a variable declaration is a require. * @param {ASTNode} decl variable declaration Node * @returns {bool} if decl is a require, return true; else return false. * @private */ function isRequire(decl) { return decl.init && decl.init.type === "CallExpression" && decl.init.callee.name === "require"; } /** * Records whether initialized/uninitialized/required variables are defined in current scope. * @param {string} statementType node.kind, one of: "var", "let", or "const" * @param {ASTNode[]} declarations List of declarations * @param {Object} currentScope The scope being investigated * @returns {void} * @private */ function recordTypes(statementType, declarations, currentScope) { for (let i = 0; i < declarations.length; i++) { if (declarations[i].init === null) { if (options[statementType] && options[statementType].uninitialized === MODE_ALWAYS) { currentScope.uninitialized = true; } } else { if (options[statementType] && options[statementType].initialized === MODE_ALWAYS) { if (options.separateRequires && isRequire(declarations[i])) { currentScope.required = true; } else { currentScope.initialized = true; } } } } } /** * Determines the current scope (function or block) * @param {string} statementType node.kind, one of: "var", "let", or "const" * @returns {Object} The scope associated with statementType */ function getCurrentScope(statementType) { let currentScope; if (statementType === "var") { currentScope = functionStack[functionStack.length - 1]; } else if (statementType === "let") { currentScope = blockStack[blockStack.length - 1].let; } else if (statementType === "const") { currentScope = blockStack[blockStack.length - 1].const; } return currentScope; } /** * Counts the number of initialized and uninitialized declarations in a list of declarations * @param {ASTNode[]} declarations List of declarations * @returns {Object} Counts of 'uninitialized' and 'initialized' declarations * @private */ function countDeclarations(declarations) { const counts = { uninitialized: 0, initialized: 0 }; for (let i = 0; i < declarations.length; i++) { if (declarations[i].init === null) { counts.uninitialized++; } else { counts.initialized++; } } return counts; } /** * Determines if there is more than one var statement in the current scope. * @param {string} statementType node.kind, one of: "var", "let", or "const" * @param {ASTNode[]} declarations List of declarations * @returns {boolean} Returns true if it is the first var declaration, false if not. * @private */ function hasOnlyOneStatement(statementType, declarations) { const declarationCounts = countDeclarations(declarations); const currentOptions = options[statementType] || {}; const currentScope = getCurrentScope(statementType); const hasRequires = declarations.some(isRequire); if (currentOptions.uninitialized === MODE_ALWAYS && currentOptions.initialized === MODE_ALWAYS) { if (currentScope.uninitialized || currentScope.initialized) { if (!hasRequires) { return false; } } } if (declarationCounts.uninitialized > 0) { if (currentOptions.uninitialized === MODE_ALWAYS && currentScope.uninitialized) { return false; } } if (declarationCounts.initialized > 0) { if (currentOptions.initialized === MODE_ALWAYS && currentScope.initialized) { if (!hasRequires) { return false; } } } if (currentScope.required && hasRequires) { return false; } recordTypes(statementType, declarations, currentScope); return true; } /** * Fixer to join VariableDeclaration's into a single declaration * @param {VariableDeclarator[]} declarations The `VariableDeclaration` to join * @returns {Function} The fixer function */ function joinDeclarations(declarations) { const declaration = declarations[0]; const body = Array.isArray(declaration.parent.parent.body) ? declaration.parent.parent.body : []; const currentIndex = body.findIndex(node => node.range[0] === declaration.parent.range[0]); const previousNode = body[currentIndex - 1]; return fixer => { const type = sourceCode.getTokenBefore(declaration); const prevSemi = sourceCode.getTokenBefore(type); const res = []; if (previousNode && previousNode.kind === sourceCode.getText(type)) { if (prevSemi.value === ";") { res.push(fixer.replaceText(prevSemi, ",")); } else { res.push(fixer.insertTextAfter(prevSemi, ",")); } res.push(fixer.replaceText(type, "")); } return res; }; } /** * Fixer to split a VariableDeclaration into individual declarations * @param {VariableDeclaration} declaration The `VariableDeclaration` to split * @returns {Function|null} The fixer function */ function splitDeclarations(declaration) { const { parent } = declaration; // don't autofix code such as: if (foo) var x, y; if (!isInStatementList(parent.type === "ExportNamedDeclaration" ? parent : declaration)) { return null; } return fixer => declaration.declarations.map(declarator => { const tokenAfterDeclarator = sourceCode.getTokenAfter(declarator); if (tokenAfterDeclarator === null) { return null; } const afterComma = sourceCode.getTokenAfter(tokenAfterDeclarator, { includeComments: true }); if (tokenAfterDeclarator.value !== ",") { return null; } const exportPlacement = declaration.parent.type === "ExportNamedDeclaration" ? "export " : ""; /* * `var x,y` * tokenAfterDeclarator ^^ afterComma */ if (afterComma.range[0] === tokenAfterDeclarator.range[1]) { return fixer.replaceText(tokenAfterDeclarator, `; ${exportPlacement}${declaration.kind} `); } /* * `var x, * tokenAfterDeclarator ^ * y` * ^ afterComma */ if ( afterComma.loc.start.line > tokenAfterDeclarator.loc.end.line || afterComma.type === "Line" || afterComma.type === "Block" ) { let lastComment = afterComma; while (lastComment.type === "Line" || lastComment.type === "Block") { lastComment = sourceCode.getTokenAfter(lastComment, { includeComments: true }); } return fixer.replaceTextRange( [tokenAfterDeclarator.range[0], lastComment.range[0]], `;${sourceCode.text.slice(tokenAfterDeclarator.range[1], lastComment.range[0])}${exportPlacement}${declaration.kind} ` ); } return fixer.replaceText(tokenAfterDeclarator, `; ${exportPlacement}${declaration.kind}`); }).filter(x => x); } /** * Checks a given VariableDeclaration node for errors. * @param {ASTNode} node The VariableDeclaration node to check * @returns {void} * @private */ function checkVariableDeclaration(node) { const parent = node.parent; const type = node.kind; if (!options[type]) { return; } const declarations = node.declarations; const declarationCounts = countDeclarations(declarations); const mixedRequires = declarations.some(isRequire) && !declarations.every(isRequire); if (options[type].initialized === MODE_ALWAYS) { if (options.separateRequires && mixedRequires) { context.report({ node, messageId: "splitRequires" }); } } // consecutive const nodeIndex = (parent.body && parent.body.length > 0 && parent.body.indexOf(node)) || 0; if (nodeIndex > 0) { const previousNode = parent.body[nodeIndex - 1]; const isPreviousNodeDeclaration = previousNode.type === "VariableDeclaration"; const declarationsWithPrevious = declarations.concat(previousNode.declarations || []); if ( isPreviousNodeDeclaration && previousNode.kind === type && !(declarationsWithPrevious.some(isRequire) && !declarationsWithPrevious.every(isRequire)) ) { const previousDeclCounts = countDeclarations(previousNode.declarations); if (options[type].initialized === MODE_CONSECUTIVE && options[type].uninitialized === MODE_CONSECUTIVE) { context.report({ node, messageId: "combine", data: { type }, fix: joinDeclarations(declarations) }); } else if (options[type].initialized === MODE_CONSECUTIVE && declarationCounts.initialized > 0 && previousDeclCounts.initialized > 0) { context.report({ node, messageId: "combineInitialized", data: { type }, fix: joinDeclarations(declarations) }); } else if (options[type].uninitialized === MODE_CONSECUTIVE && declarationCounts.uninitialized > 0 && previousDeclCounts.uninitialized > 0) { context.report({ node, messageId: "combineUninitialized", data: { type }, fix: joinDeclarations(declarations) }); } } } // always if (!hasOnlyOneStatement(type, declarations)) { if (options[type].initialized === MODE_ALWAYS && options[type].uninitialized === MODE_ALWAYS) { context.report({ node, messageId: "combine", data: { type }, fix: joinDeclarations(declarations) }); } else { if (options[type].initialized === MODE_ALWAYS && declarationCounts.initialized > 0) { context.report({ node, messageId: "combineInitialized", data: { type }, fix: joinDeclarations(declarations) }); } if (options[type].uninitialized === MODE_ALWAYS && declarationCounts.uninitialized > 0) { if (node.parent.left === node && (node.parent.type === "ForInStatement" || node.parent.type === "ForOfStatement")) { return; } context.report({ node, messageId: "combineUninitialized", data: { type }, fix: joinDeclarations(declarations) }); } } } // never if (parent.type !== "ForStatement" || parent.init !== node) { const totalDeclarations = declarationCounts.uninitialized + declarationCounts.initialized; if (totalDeclarations > 1) { if (options[type].initialized === MODE_NEVER && options[type].uninitialized === MODE_NEVER) { // both initialized and uninitialized context.report({ node, messageId: "split", data: { type }, fix: splitDeclarations(node) }); } else if (options[type].initialized === MODE_NEVER && declarationCounts.initialized > 0) { // initialized context.report({ node, messageId: "splitInitialized", data: { type }, fix: splitDeclarations(node) }); } else if (options[type].uninitialized === MODE_NEVER && declarationCounts.uninitialized > 0) { // uninitialized context.report({ node, messageId: "splitUninitialized", data: { type }, fix: splitDeclarations(node) }); } } } } //-------------------------------------------------------------------------- // Public API //-------------------------------------------------------------------------- return { Program: startFunction, FunctionDeclaration: startFunction, FunctionExpression: startFunction, ArrowFunctionExpression: startFunction, StaticBlock: startFunction, // StaticBlock creates a new scope for `var` variables BlockStatement: startBlock, ForStatement: startBlock, ForInStatement: startBlock, ForOfStatement: startBlock, SwitchStatement: startBlock, VariableDeclaration: checkVariableDeclaration, "ForStatement:exit": endBlock, "ForOfStatement:exit": endBlock, "ForInStatement:exit": endBlock, "SwitchStatement:exit": endBlock, "BlockStatement:exit": endBlock, "Program:exit": endFunction, "FunctionDeclaration:exit": endFunction, "FunctionExpression:exit": endFunction, "ArrowFunctionExpression:exit": endFunction, "StaticBlock:exit": endFunction }; } };
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