1 | /**
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2 | * @fileoverview Disallow sparse arrays
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3 | * @author Nicholas C. Zakas
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4 | */
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5 | ;
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6 |
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7 | //------------------------------------------------------------------------------
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8 | // Rule Definition
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9 | //------------------------------------------------------------------------------
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10 |
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11 | module.exports = {
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12 | meta: {
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13 | type: "problem",
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14 |
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15 | docs: {
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16 | description: "disallow sparse arrays",
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17 | category: "Possible Errors",
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18 | recommended: true,
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19 | url: "https://eslint.org/docs/rules/no-sparse-arrays"
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20 | },
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21 |
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22 | schema: [],
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23 |
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24 | messages: {
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25 | unexpectedSparseArray: "Unexpected comma in middle of array."
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26 | }
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27 | },
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28 |
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29 | create(context) {
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30 |
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31 |
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32 | //--------------------------------------------------------------------------
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33 | // Public
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34 | //--------------------------------------------------------------------------
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35 |
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36 | return {
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37 |
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38 | ArrayExpression(node) {
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39 |
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40 | const emptySpot = node.elements.indexOf(null) > -1;
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41 |
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42 | if (emptySpot) {
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43 | context.report({ node, messageId: "unexpectedSparseArray" });
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44 | }
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45 | }
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46 |
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47 | };
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48 |
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49 | }
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50 | };
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