ESLintRequire braces in arrow function body (arrow-body-style)
要求箭头函数体使用大括号 (arrow-body-style)
The --fix option on the command line can automatically fix some of the problems reported by this rule.
命令行中的 --fix 选项可以自动修复一些该规则报告的问题。
Arrow functions have two syntactic forms for their function bodies. They may be defined with a block body (denoted by curly braces) () => { ... } or with a single expression () => ..., whose value is implicitly returned.
箭头函数的主题有两种语法格式。它们可以被定义为一个 块(用大括号)() => { ... } 或只用单一的表达式() => ...，隐式返回值。
Rule Details
This rule can enforce or disallow the use of braces around arrow function body.
该规则可以强制或禁止箭头函数体使用大括号。
Options
The rule takes one or two options. The first is a string, which can be:
该规则有一到两个选项。第一个选项是个字符串，可以是：
"always"enforces braces around the function body"always"强制在箭头函数体周围使用大括号"as-needed"enforces no braces where they can be omitted (default)"as-needed"当大括号是可以省略的，强制不使用它们 (默认)"never"enforces no braces around the function body (constrains arrow functions to the role of returning an expression)"never"禁止在函数体周围出现大括号 (将箭头函数限制为返回结果的表达式)
The second one is an object for more fine-grained configuration when the first option is "as-needed". Currently, the only available option is requireReturnForObjectLiteral, a boolean property. It’s false by default. If set to true, it requires braces and an explicit return for object literals.
第二个选项是个对象，当第一个选项是 "as-needed"，可以进行更加细粒度的配置。目前，唯一有效的选项是一个布尔属性 requireReturnForObjectLiteral。默认为 false。如果设置为 true，它要求使用大括号，并且显示返回对象字面量。
"arrow-body-style": ["error", "always"]
always
Examples of incorrect code for this rule with the "always" option:
选项 "always" 的 错误 代码示例：
/*eslint arrow-body-style: ["error", "always"]*/
/*eslint-env es6*/
let foo = () => 0;
Examples of correct code for this rule with the "always" option:
选项 "always" 的 正确 代码示例：
let foo = () => {
return 0;
};
let foo = (retv, name) => {
retv[name] = true;
return retv;
};
as-needed
Examples of incorrect code for this rule with the default "as-needed" option:
默认选项 "as-needed" 的 错误 代码示例：
/*eslint arrow-body-style: ["error", "as-needed"]*/
/*eslint-env es6*/
let foo = () => {
return 0;
};
let foo = () => {
return {
bar: {
foo: 1,
bar: 2,
}
};
};
Examples of correct code for this rule with the default "as-needed" option:
默认选项 "as-needed" 的 正确 代码示例：
/*eslint arrow-body-style: ["error", "as-needed"]*/
/*eslint-env es6*/
let foo = () => 0;
let foo = (retv, name) => {
retv[name] = true;
return retv;
};
let foo = () => ({
bar: {
foo: 1,
bar: 2,
}
});
let foo = () => { bar(); };
let foo = () => {};
let foo = () => { /* do nothing */ };
let foo = () => {
// do nothing.
};
let foo = () => ({ bar: 0 });
requireReturnForObjectLiteral
This option is only applicable when used in conjunction with the
"as-needed"option.
该选项只适合与`“as-needed”配合使用。
Examples of incorrect code for this rule with the { "requireReturnForObjectLiteral": true } option:
选项 { "requireReturnForObjectLiteral": true } 的 错误 代码示例：
/*eslint arrow-body-style: ["error", "as-needed", { "requireReturnForObjectLiteral": true }]*/
/*eslint-env es6*/
let foo = () => ({});
let foo = () => ({ bar: 0 });
Examples of correct code for this rule with the { "requireReturnForObjectLiteral": true } option:
选项 { "requireReturnForObjectLiteral": true } 的 正确 代码示例：
/*eslint arrow-body-style: ["error", "as-needed", { "requireReturnForObjectLiteral": true }]*/
/*eslint-env es6*/
let foo = () => {};
let foo = () => { return { bar: 0 }; };
never
Examples of incorrect code for this rule with the "never" option:
选项 "never" 的 错误 代码示例：
/*eslint arrow-body-style: ["error", "never"]*/
/*eslint-env es6*/
let foo = () => {
return 0;
};
let foo = (retv, name) => {
retv[name] = true;
return retv;
};
Examples of correct code for this rule with the "never" option:
选项 "never" 的 正确 代码示例：
/*eslint arrow-body-style: ["error", "never"]*/
/*eslint-env es6*/
let foo = () => 0;
let foo = () => ({ foo: 0 });
Version
This rule was introduced in ESLint 1.8.0.
该规则在 ESLint 1.8.0 中被引入。