noConstantCondition

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/noConstantCondition

¥Diagnostic Category: lint/correctness/noConstantCondition
此规则为推荐规则，默认启用。

¥This rule is recommended, which means is enabled by default.
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-constant-condition 相同
  
  ¥Same as no-constant-condition

如何配置

¥How to configure

1
{
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  "linter": {
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    "rules": {
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      "correctness": {
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        "noConstantCondition": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止在条件中使用常量表达式

¥Disallow constant expressions in conditions

示例

¥Examples

无效

¥Invalid

1
if (false) {
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    doSomethingUnfinished();
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}

code-block.js:1:5 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ if (false) {
      │     ^^^^^
    2 │     doSomethingUnfinished();
    3 │ }

1
if (Boolean(1)) {
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    doSomethingAlways();
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}

code-block.js:1:5 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ if (Boolean(1)) {
      │     ^^^^^^^^^^
    2 │     doSomethingAlways();
    3 │ }

1
if (undefined) {
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    doSomethingUnfinished();
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}

code-block.js:1:5 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ if (undefined) {
      │     ^^^^^^^^^
    2 │     doSomethingUnfinished();
    3 │ }

1
for (;-2;) {
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    doSomethingForever();
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}

code-block.js:1:7 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ for (;-2;) {
      │       ^^
    2 │     doSomethingForever();
    3 │ }

1
while (typeof x) {
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    doSomethingForever();
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}

code-block.js:1:8 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ while (typeof x) {
      │        ^^^^^^^^
    2 │     doSomethingForever();
    3 │ }

1
var result = 0 ? a : b;

code-block.js:1:14 lint/correctness/noConstantCondition ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Unexpected constant condition.
  
  > 1 │ var result = 0 ? a : b;
      │              ^
    2 │

有效

¥Valid

1
if (x === 0) {
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    doSomething();
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}
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for (;;) {
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    doSomethingForever();
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}
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while (typeof x === "undefined") {
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    doSomething();
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}
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13
do {
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    doSomething();
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} while (x);
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var result = x !== 0 ? a : b;
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// Exception
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while (true) {
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    if (x) { break; }
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    x = f();
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}

noConstantCondition

摘要

如何配置

描述

示例

无效

有效

相关链接