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/**
* @fileoverview Rule to disallow a duplicate case label.
* @author Dieter Oberkofler
* @author Burak Yigit Kaya
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "problem",
docs: {
description: "disallow duplicate case labels",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/rules/no-duplicate-case"
},
schema: [],
messages: {
unexpected: "Duplicate case label."
}
},
create(context) {
const sourceCode = context.getSourceCode();
return {
SwitchStatement(node) {
const mapping = {};
node.cases.forEach(switchCase => {
const key = sourceCode.getText(switchCase.test);
if (mapping[key]) {
context.report({ node: switchCase, messageId: "unexpected" });
} else {
mapping[key] = switchCase;
}
});
}
};
}
};