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/**
* @fileoverview A rule to disallow modifying variables that are declared using `const`
* @author Toru Nagashima
*/
"use strict";
const astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow reassigning `const` variables",
category: "ECMAScript 6",
recommended: true
},
schema: []
},
create(context) {
/**
* Finds and reports references that are non initializer and writable.
* @param {Variable} variable - A variable to check.
* @returns {void}
*/
function checkVariable(variable) {
astUtils.getModifyingReferences(variable.references).forEach(reference => {
context.report({ node: reference.identifier, message: "'{{name}}' is constant.", data: { name: reference.identifier.name } });
});
}
return {
VariableDeclaration(node) {
if (node.kind === "const") {
context.getDeclaredVariables(node).forEach(checkVariable);
}
}
};
}
};
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