valid-typeof

强制将 typeof 表达式与有效字符串进行比较

配置文件 中的 "extends": "eslint:recommended" 属性启用了该规则

对于绝大多数用例，typeof 运算符的结果是以下字符串字面之一："undefined"、"object"、"boolean"、"number"、"string"、"function"、"symbol" 和 "bigint"。将 typeof 运算符的结果与其他字符串字面进行比较通常是输入错误。

规则详情

此规则强制将 typeof 表达式与有效的字符串字面进行比较。

选项

此规则有一个对象选项：

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/*eslint valid-typeof: "error"*/

typeof foo === "strnig"
typeof foo == "undefimed"
typeof bar != "nunber"
typeof bar !== "fucntion"

f/g6SKVZdhoBiPVtnee0m+uPEv1T4kMgIaFUpxdtFwzAZHGBqJ5dJxRHxHHP/cP8

/*eslint valid-typeof: "error"*/

typeof foo === "string"
typeof bar == "undefined"
typeof foo === baz
typeof bar === typeof qux

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/*eslint valid-typeof: ["error", { "requireStringLiterals": true }]*/

typeof foo === undefined
typeof bar == Object
typeof baz === "strnig"
typeof qux === "some invalid type"
typeof baz === anotherVariable
typeof foo == 5

gQzllAsZ059cLdy1bLUCRpy/53UpPicVmHnc1qqj4NmGBTehrgt8GiKAqMIWgUdrt09r92s6qAJRnyz5qf5hQ0uaTpmZd0Jhi2pfBn8KT5rBqFKgEOA1SX27KX3vH8mQ

/*eslint valid-typeof: ["error", { "requireStringLiterals": true }]*/

typeof foo === "undefined"
typeof bar == "object"
typeof baz === "string"
typeof bar === typeof qux

何时不使用

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