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/**
* @fileoverview Disallow construction of dense arrays using the Array constructor
* @author Matt DuVall <http://www.mattduvall.com/>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const {
getVariableByName,
isClosingParenToken,
isOpeningParenToken,
isStartOfExpressionStatement,
needsPrecedingSemicolon
} = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "Disallow `Array` constructors",
recommended: false,
url: "https://eslint.org/docs/latest/rules/no-array-constructor"
},
hasSuggestions: true,
schema: [],
messages: {
preferLiteral: "The array literal notation [] is preferable.",
useLiteral: "Replace with an array literal.",
useLiteralAfterSemicolon: "Replace with an array literal, add preceding semicolon."
}
},
create(context) {
const sourceCode = context.sourceCode;
/**
* Gets the text between the calling parentheses of a CallExpression or NewExpression.
* @param {ASTNode} node A CallExpression or NewExpression node.
* @returns {string} The text between the calling parentheses, or an empty string if there are none.
*/
function getArgumentsText(node) {
const lastToken = sourceCode.getLastToken(node);
if (!isClosingParenToken(lastToken)) {
return "";
}
let firstToken = node.callee;
do {
firstToken = sourceCode.getTokenAfter(firstToken);
if (!firstToken || firstToken === lastToken) {
return "";
}
} while (!isOpeningParenToken(firstToken));
return sourceCode.text.slice(firstToken.range[1], lastToken.range[0]);
}
/**
* Disallow construction of dense arrays using the Array constructor
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function check(node) {
if (
node.callee.type !== "Identifier" ||
node.callee.name !== "Array" ||
node.arguments.length === 1 &&
node.arguments[0].type !== "SpreadElement") {
return;
}
const variable = getVariableByName(sourceCode.getScope(node), "Array");
/*
* Check if `Array` is a predefined global variable: predefined globals have no declarations,
* meaning that the `identifiers` list of the variable object is empty.
*/
if (variable && variable.identifiers.length === 0) {
const argsText = getArgumentsText(node);
let fixText;
let messageId;
/*
* Check if the suggested change should include a preceding semicolon or not.
* Due to JavaScript's ASI rules, a missing semicolon may be inserted automatically
* before an expression like `Array()` or `new Array()`, but not when the expression
* is changed into an array literal like `[]`.
*/
if (isStartOfExpressionStatement(node) && needsPrecedingSemicolon(sourceCode, node)) {
fixText = `;[${argsText}]`;
messageId = "useLiteralAfterSemicolon";
} else {
fixText = `[${argsText}]`;
messageId = "useLiteral";
}
context.report({
node,
messageId: "preferLiteral",
suggest: [
{
messageId,
fix: fixer => fixer.replaceText(node, fixText)
}
]
});
}
}
return {
CallExpression: check,
NewExpression: check
};
}
};