%PDF-
%PDF-
Mini Shell
Mini Shell
/**
* @fileoverview Rule to flag variables that are never assigned
* @author Jacob Bandes-Storch <https://github.com/jtbandes>
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "problem",
dialects: ["typescript", "javascript"],
language: "javascript",
docs: {
description:
"Disallow `let` or `var` variables that are read but never assigned",
recommended: false,
url: "https://eslint.org/docs/latest/rules/no-unassigned-vars",
},
schema: [],
messages: {
unassigned:
"'{{name}}' is always 'undefined' because it's never assigned.",
},
},
create(context) {
const sourceCode = context.sourceCode;
return {
VariableDeclarator(node) {
/** @type {import('estree').VariableDeclaration} */
const declaration = node.parent;
const shouldCheck =
!node.init &&
node.id.type === "Identifier" &&
declaration.kind !== "const" &&
!declaration.declare;
if (!shouldCheck) {
return;
}
const [variable] = sourceCode.getDeclaredVariables(node);
if (!variable) {
return;
}
let hasRead = false;
for (const reference of variable.references) {
if (reference.isWrite()) {
return;
}
if (reference.isRead()) {
hasRead = true;
}
}
if (!hasRead) {
// Variables that are never read should be flagged by no-unused-vars instead
return;
}
context.report({
node,
messageId: "unassigned",
data: { name: node.id.name },
});
},
};
},
};
Zerion Mini Shell 1.0