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