noUndeclaredVariables

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/correctness/noUndeclaredVariables

¥Diagnostic Category: lint/correctness/noUndeclaredVariables
此规则没有修复方案。

¥This rule doesn’t have a fix.
此规则的默认严重级别为 error。

¥The default severity of this rule is error.
来源：

¥Sources:
- 与 no-undef 相同
  
  ¥Same as no-undef

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "correctness": {
5
        "noUndeclaredVariables": "error"
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      }
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    }
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  }
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}

描述

¥Description

防止使用文档中未声明的变量。

¥Prevents the usage of variables that haven’t been declared inside the document.

如果你需要允许列出某些全局绑定，则可以使用 javascript.globals 配置。

¥If you need to allow-list some global bindings, you can use the javascript.globals configuration.

示例

¥Examples

无效

¥Invalid

1
foobar;

code-block.js:1:1 lint/correctness/noUndeclaredVariables ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The foobar variable is undeclared.
  
  > 1 │ foobar;
      │ ^^^^^^
    2 │ 
  
  ℹ By default, Biome recognizes browser and Node.js globals.
    You can ignore more globals using the javascript.globals configuration.

1
// throw diagnostic for JavaScript files
2
PromiseLike;

code-block.js:2:1 lint/correctness/noUndeclaredVariables ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The PromiseLike variable is undeclared.
  
    1 │ // throw diagnostic for JavaScript files
  > 2 │ PromiseLike;
      │ ^^^^^^^^^^^
    3 │ 
  
  ℹ By default, Biome recognizes browser and Node.js globals.
    You can ignore more globals using the javascript.globals configuration.

有效

¥Valid

1
type B<T> = PromiseLike<T>

选项

¥Options

`checkTypes`

设置为 true 时，它还会检查未声明的类型。该选项默认值为 false。

¥When set to true, it checks for undeclared types too. The option defaults to false.

1
{
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  "linter": {
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    "rules": {
4
      "correctness": {
5
        "noUndeclaredVariables": {
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          "options": {
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            "checkTypes": true
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          }
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        }
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      }
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    }
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  }
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}

1
type A = number extends infer T ? never : T;

code-block.ts:1:43 lint/correctness/noUndeclaredVariables ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The T variable is undeclared.
  
  > 1 │ type A = number extends infer T ? never : T;
      │                                           ^
    2 │ 
  
  ℹ By default, Biome recognizes browser and Node.js globals.
    You can ignore more globals using the javascript.globals configuration.

noUndeclaredVariables

摘要

如何配置

描述

示例

无效

有效

选项

checkTypes

相关链接

`checkTypes`