/**
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* @fileoverview Rule to flag when using constructor without parentheses
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("../util/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "require parentheses when invoking a constructor with no arguments",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/new-parens"
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},
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fixable: "code",
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schema: [],
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messages: {
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missing: "Missing '()' invoking a constructor."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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return {
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NewExpression(node) {
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if (node.arguments.length !== 0) {
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return; // shortcut: if there are arguments, there have to be parens
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}
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const lastToken = sourceCode.getLastToken(node);
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const hasLastParen = lastToken && astUtils.isClosingParenToken(lastToken);
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const hasParens = hasLastParen && astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken));
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if (!hasParens) {
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context.report({
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node,
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messageId: "missing",
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fix: fixer => fixer.insertTextAfter(node, "()")
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});
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}
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}
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};
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}
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};
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