no-sparse-arrays.js•1.2 kB
/**
* @fileoverview Disallow sparse arrays
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
type: "problem",
docs: {
description: "Disallow sparse arrays",
recommended: true,
url: "https://eslint.org/docs/latest/rules/no-sparse-arrays"
},
schema: [],
messages: {
unexpectedSparseArray: "Unexpected comma in middle of array."
}
},
create(context) {
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
ArrayExpression(node) {
const emptySpot = node.elements.includes(null);
if (emptySpot) {
context.report({ node, messageId: "unexpectedSparseArray" });
}
}
};
}
};