| /** |
| * @fileoverview Rule to flag when using constructor without parentheses |
| * @author Ilya Volodin |
| */ |
| |
| "use strict"; |
| |
| //------------------------------------------------------------------------------ |
| // Requirements |
| //------------------------------------------------------------------------------ |
| |
| const astUtils = require("./utils/ast-utils"); |
| |
| //------------------------------------------------------------------------------ |
| // Helpers |
| //------------------------------------------------------------------------------ |
| |
| //------------------------------------------------------------------------------ |
| // Rule Definition |
| //------------------------------------------------------------------------------ |
| |
| module.exports = { |
| meta: { |
| type: "layout", |
| |
| docs: { |
| description: "enforce or disallow parentheses when invoking a constructor with no arguments", |
| category: "Stylistic Issues", |
| recommended: false, |
| url: "https://eslint.org/docs/rules/new-parens" |
| }, |
| |
| fixable: "code", |
| schema: { |
| anyOf: [ |
| { |
| type: "array", |
| items: [ |
| { |
| enum: ["always", "never"] |
| } |
| ], |
| minItems: 0, |
| maxItems: 1 |
| } |
| ] |
| }, |
| messages: { |
| missing: "Missing '()' invoking a constructor.", |
| unnecessary: "Unnecessary '()' invoking a constructor with no arguments." |
| } |
| }, |
| |
| create(context) { |
| const options = context.options; |
| const always = options[0] !== "never"; // Default is always |
| |
| const sourceCode = context.getSourceCode(); |
| |
| return { |
| NewExpression(node) { |
| if (node.arguments.length !== 0) { |
| return; // if there are arguments, there have to be parens |
| } |
| |
| const lastToken = sourceCode.getLastToken(node); |
| const hasLastParen = lastToken && astUtils.isClosingParenToken(lastToken); |
| const hasParens = hasLastParen && astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken)); |
| |
| if (always) { |
| if (!hasParens) { |
| context.report({ |
| node, |
| messageId: "missing", |
| fix: fixer => fixer.insertTextAfter(node, "()") |
| }); |
| } |
| } else { |
| if (hasParens) { |
| context.report({ |
| node, |
| messageId: "unnecessary", |
| fix: fixer => [ |
| fixer.remove(sourceCode.getTokenBefore(lastToken)), |
| fixer.remove(lastToken), |
| fixer.insertTextBefore(node, "("), |
| fixer.insertTextAfter(node, ")") |
| ] |
| }); |
| } |
| } |
| } |
| }; |
| } |
| }; |