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7 | "use strict";
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12 |
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13 | module.exports = {
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14 | meta: {
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15 | docs: {
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16 | description: "disallow duplicate case labels",
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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-duplicate-case"
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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 | unexpected: "Duplicate case label."
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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 | const sourceCode = context.getSourceCode();
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31 |
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32 | return {
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33 | SwitchStatement(node) {
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34 | const mapping = {};
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35 |
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36 | node.cases.forEach(switchCase => {
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37 | const key = sourceCode.getText(switchCase.test);
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38 |
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39 | if (mapping[key]) {
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40 | context.report({ node: switchCase, messageId: "unexpected" });
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41 | } else {
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42 | mapping[key] = switchCase;
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43 | }
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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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