noUnassignedVariables
¥Summary
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规则生效日期：
v2.1.0¥Rule available since:
v2.1.0 -
诊断类别：
lint/suspicious/noUnassignedVariables¥Diagnostic Category:
lint/suspicious/noUnassignedVariables -
此规则没有修复方案。
¥This rule doesn’t have a fix.
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此规则的默认严重级别为 information。
¥The default severity of this rule is information.
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来源：
¥Sources:
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与
no-unassigned-vars相同¥Same as
no-unassigned-vars
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¥How to configure
{ "linter": { "rules": { "suspicious": { "noUnassignedVariables": "error" } } }}¥Description
禁止读取但从未赋值的 let 或 var 变量。
¥Disallow let or var variables that are read but never assigned.
此规则标记从未赋值但仍在代码中被读取或使用的 let 或 var 声明。由于这些变量始终为 undefined，因此使用它们很可能是编程错误。
¥This rule flags let or var declarations that are never assigned a value but are still read or used in the code. Since these variables will always be undefined, their usage is likely a programming mistake.
¥Examples
¥Invalid
let status;if (status === 'ready') { console.log('Status is ready');}code-block.js:1:5 lint/suspicious/noUnassignedVariables ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ The variable ‘status’ is declared but never assigned a value.
> 1 │ let status;
│ ^^^^^^
2 │ if (status === ‘ready’) {
3 │ console.log(‘Status is ready’);
ℹ Variable declared without assignment. Either assign a value or remove the declaration.
let value: number | undefined;console.log(value);code-block.ts:1:5 lint/suspicious/noUnassignedVariables ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ The variable ‘value’ is declared but never assigned a value.
> 1 │ let value: number | undefined;
│ ^^^^^^^^^^^^^^^^^^^^^^^^^
2 │ console.log(value);
3 │
ℹ Variable declared without assignment. Either assign a value or remove the declaration.
¥Valid
let message = "hello";console.log(message);
let user;user = getUser();console.log(user.name);
let count;count = 0;count++;declare let value: number | undefined;console.log(value);
declare module "my-module" { let value: string; export = value;}¥Related links
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