如何禁用单行的 Flow (JS) 类型检查

Question

我的一些单元测试涉及将无效（输入不正确的）数据传递给函数。例如：

// user.js

type User = {
    id: number,
    name: string,
    email: string
}

export function validateUser(user: User): Promise<void> {
    return new Promise((resolve, reject) => {
        // resolve if user is valid, reject if not
    })
}

// user.unit.js

import {validateUser} from '../user.js' 

describe('validateUser', () => {
    it('should reject if user is not valid', () => {
        const invalidUser: User = {}
        expect(validateUser(invalidUser)).to.be.rejected
    })
})

由于invalidUser变量不符合User类型，所以出现流程错误：

Cannot call validateUser with invalidUser bound to user because:
 • property id is missing in object literal [1] but exists in User [2].
 • property name is missing in object literal [1] but exists in User [2].
 • property email is missing in object literal [1] but exists in User [2].

显然我希望这个变量无效，那么如何禁用对这个单个实例的流类型检查？

Answer 1

根据.flowconfig [options] docs, there is an option to specify a suppress comment。 Flow 将检测此注释并忽略以下代码行。

默认：

If no suppression comments are specified in your config, Flow will apply one default: // $FlowFixMe.

所以只需添加注释 ($FlowFixMe) 以禁止对单行进行类型检查。

// $FlowFixMe
const invalidUser: User = {}

如何禁用单行的 Flow (JS) 类型检查

How to disable Flow (JS) type checking for a single line

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