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Viewing file:     no-sparse-arrays.js (1.9 KB)      -rw-r--r--

/**
 * @fileoverview Disallow sparse arrays
 * @author Nicholas C. Zakas
 */
"use strict";

const astUtils = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// 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) {
                if (!node.elements.includes(null)) {
                    return;
                }

                const { sourceCode } = context;
                let commaToken;

                for (const [index, element] of node.elements.entries()) {
                    if (index === node.elements.length - 1 && element) {
                        return;
                    }

                    commaToken = sourceCode.getTokenAfter(
                        element ?? commaToken ?? sourceCode.getFirstToken(node),
                        astUtils.isCommaToken
                    );

                    if (element) {
                        continue;
                    }

                    context.report({
                        node,
                        loc: commaToken.loc,
                        messageId: "unexpectedSparseArray"
                    });
                }
            }

        };

    }
};