Permalink
Cannot retrieve contributors at this time
| /** | |
| * @fileoverview Rule to check multiple var declarations per line | |
| * @author Alberto Rodríguez | |
| */ | |
| "use strict"; | |
| //------------------------------------------------------------------------------ | |
| // Rule Definition | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "suggestion", | |
| docs: { | |
| description: "require or disallow newlines around variable declarations", | |
| category: "Stylistic Issues", | |
| recommended: false, | |
| url: "https://eslint.org/docs/rules/one-var-declaration-per-line" | |
| }, | |
| schema: [ | |
| { | |
| enum: ["always", "initializations"] | |
| } | |
| ], | |
| fixable: "whitespace" | |
| }, | |
| create(context) { | |
| const ERROR_MESSAGE = "Expected variable declaration to be on a new line."; | |
| const always = context.options[0] === "always"; | |
| //-------------------------------------------------------------------------- | |
| // Helpers | |
| //-------------------------------------------------------------------------- | |
| /** | |
| * Determine if provided keyword is a variant of for specifiers | |
| * @private | |
| * @param {string} keyword keyword to test | |
| * @returns {boolean} True if `keyword` is a variant of for specifier | |
| */ | |
| function isForTypeSpecifier(keyword) { | |
| return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement"; | |
| } | |
| /** | |
| * Checks newlines around variable declarations. | |
| * @private | |
| * @param {ASTNode} node `VariableDeclaration` node to test | |
| * @returns {void} | |
| */ | |
| function checkForNewLine(node) { | |
| if (isForTypeSpecifier(node.parent.type)) { | |
| return; | |
| } | |
| const declarations = node.declarations; | |
| let prev; | |
| declarations.forEach(current => { | |
| if (prev && prev.loc.end.line === current.loc.start.line) { | |
| if (always || prev.init || current.init) { | |
| context.report({ | |
| node, | |
| message: ERROR_MESSAGE, | |
| loc: current.loc.start, | |
| fix: fixer => fixer.insertTextBefore(current, "\n") | |
| }); | |
| } | |
| } | |
| prev = current; | |
| }); | |
| } | |
| //-------------------------------------------------------------------------- | |
| // Public | |
| //-------------------------------------------------------------------------- | |
| return { | |
| VariableDeclaration: checkForNewLine | |
| }; | |
| } | |
| }; |