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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/eslint/lib/rules
Просмотр файла: no-unassigned-vars.js
/**
* @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;
let insideDeclareModule = false;
return {
"TSModuleDeclaration[declare=true]"() {
insideDeclareModule = true;
},
"TSModuleDeclaration[declare=true]:exit"() {
insideDeclareModule = false;
},
VariableDeclarator(node) {
/** @type {import('estree').VariableDeclaration} */
const declaration = node.parent;
const shouldSkip =
node.init ||
node.id.type !== "Identifier" ||
declaration.kind === "const" ||
declaration.declare ||
insideDeclareModule;
if (shouldSkip) {
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 },
});
},
};
},
};
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