Eslint
规则 | Rules

no-self-assign

禁止自我分配(no-self-assign)

"extends": "eslint:recommended"配置文件中的属性启用此规则。

自我分配没有效果,因此可能会由于重构不完全而导致错误。那些表明你应该做的事情仍然存在。

foo = foo; [bar, baz] = [bar, qiz];

规则细节

这条规则旨在消除自我分配。

此规则的错误代码示例:

/*eslint no-self-assign: "error"*/ foo = foo; [a, b] = [a, b]; [a, ...b] = [x, ...b]; {a, b} = {a, x}

此规则的正确代码示例:

/*eslint no-self-assign: "error"*/ foo = bar; [a, b] = [b, a]; // This pattern is warned by the `no-use-before-define` rule. let foo = foo; // The default values have an effect. [foo = 1] = [foo];

选项

此规则也可以选择检查属性。

{ "no-self-assign": ["error", {"props": false}] }

  • props- 如果是trueno-self-assign规则会警告属性的自我分配。默认是false

配件

{ "props": true }选项的错误代码示例:

/*eslint no-self-assign: [error, {props: true}]*/ // self-assignments with properties. obj.a = obj.a; obj.a.b = obj.a.b; obj["a"] = obj["a"]; obj[a] = obj[a];

{ "props": true }选项的正确代码示例:

/*eslint no-self-assign: [error, {props: true}]*/ // non-self-assignments with properties. obj.a = obj.b; obj.a.b = obj.c.b; obj.a.b = obj.a.c; obj[a] = obj["a"] // This ignores if there is a function call. obj.a().b = obj.a().b a().b = a().b // Known limitation: this does not support computed properties except single literal or single identifier. obj[a + b] = obj[a + b]; obj["a" + "b"] = obj["a" + "b"];

何时不使用它?

如果您不想通知自我分配,那么禁用此规则是安全的。

版本

该规则在ESLint 2.0.0-rc.0中引入。

资源