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| /** | |
| * @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); | |
| // `hasParens` is true only if the new expression ends with its own parens, e.g., new new foo() does not end with its own parens | |
| const hasParens = hasLastParen && | |
| astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken)) && | |
| node.callee.range[1] < node.range[1]; | |
| 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, ")") | |
| ] | |
| }); | |
| } | |
| } | |
| } | |
| }; | |
| } | |
| }; |