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codeql-action/node_modules/eslint/lib/rules/no-global-assign.js
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/** | |
* @fileoverview Rule to disallow assignments to native objects or read-only global variables | |
* @author Ilya Volodin | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow assignments to native objects or read-only global variables", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/no-global-assign" | |
}, | |
schema: [ | |
{ | |
type: "object", | |
properties: { | |
exceptions: { | |
type: "array", | |
items: { type: "string" }, | |
uniqueItems: true | |
} | |
}, | |
additionalProperties: false | |
} | |
], | |
messages: { | |
globalShouldNotBeModified: "Read-only global '{{name}}' should not be modified." | |
} | |
}, | |
create(context) { | |
const config = context.options[0]; | |
const sourceCode = context.sourceCode; | |
const exceptions = (config && config.exceptions) || []; | |
/** | |
* Reports write references. | |
* @param {Reference} reference A reference to check. | |
* @param {int} index The index of the reference in the references. | |
* @param {Reference[]} references The array that the reference belongs to. | |
* @returns {void} | |
*/ | |
function checkReference(reference, index, references) { | |
const identifier = reference.identifier; | |
if (reference.init === false && | |
reference.isWrite() && | |
/* | |
* Destructuring assignments can have multiple default value, | |
* so possibly there are multiple writeable references for the same identifier. | |
*/ | |
(index === 0 || references[index - 1].identifier !== identifier) | |
) { | |
context.report({ | |
node: identifier, | |
messageId: "globalShouldNotBeModified", | |
data: { | |
name: identifier.name | |
} | |
}); | |
} | |
} | |
/** | |
* Reports write references if a given variable is read-only builtin. | |
* @param {Variable} variable A variable to check. | |
* @returns {void} | |
*/ | |
function checkVariable(variable) { | |
if (variable.writeable === false && !exceptions.includes(variable.name)) { | |
variable.references.forEach(checkReference); | |
} | |
} | |
return { | |
Program(node) { | |
const globalScope = sourceCode.getScope(node); | |
globalScope.variables.forEach(checkVariable); | |
} | |
}; | |
} | |
}; |