类型‘(v1: number，callback: Function) => Promise<void>’不能赋值给类型为'string | ((arguments_0: number) => Promise<void>)‘的参数
类型‘(v1: number，callback: Function) => Promise<void>’不能赋值给类型为'string | ((arguments_0: number) => Promise<void>)‘的参数
提问于 2021-08-07 07:17:41
从wdio更新到wdio (6.11.0 with "typescript"："^4.2.2")后，我开始在browser.executeAsync(runCheck，v1)上看到以下错误
error TS2345: Argument of type ‘(v1: number, callback: Function) => Promise<void>'
is not assignable to parameter of type 'string | ((arguments_0: number) => void)'.下面是我的代码：
const runCheck = async (
v1: number,
callback: Function
): Promise<void> => {
...
...
...
callback(v1);
};
const canReceive = (
browser: WebdriverIO.BrowserObject,
): boolean => {
const v1 = 50;
const rate = browser.call(() =>
browser.executeAsync(runCheck, v1)
);
return rate > 10;
};我已经尝试过修改
Promise<void> to Promise<any>但似乎没什么帮助。任何关于如何解决这个问题的观点都是值得感谢的。
提前谢谢你。
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-08-08 17:25:52
TLDR，我认为wdio 6中的typescript类型定义是错误的。
尝试以any身份键入runCheck以解决此问题。
import { expect } from 'chai';
import { Browser } from 'webdriverio'
describe('WebdriverIO 6', () => {
it("has broken typescript type definitions", () => {
const runCheck: any =
async (v1: number, callback: Function): Promise<void> => {
callback(v1);
};
const canReceive =
async (browser: WebdriverIO.BrowserObject): Promise<boolean> => {
const v1 = 50;
const rate = await browser.call(() => browser.executeAsync(runCheck, v1));
return rate > 10;
};
})
})长版本。
我看了一下browser.executeAsync的文档，看起来你在传递它应该接受的参数。
“脚本参数以函数体的形式定义要执行的脚本。将使用提供的参数数组调用该函数，并且可以通过参数对象以指定的顺序访问值。最后一个参数将始终是一个回调函数，必须调用该函数以通知脚本已完成。”https://v6.webdriver.io/docs/api/browser/executeAsync.html
在检查executeAsync的类型定义时，我看到了以下内容
// there is no way to add callback as last parameter after `...args`.
// https://github.com/Microsoft/TypeScript/issues/1360
// executeAsync: <T>(script: string | ((...arguments: any[], callback: (result: T) => void) => void), ...arguments: any[]) => Promise<T>;
/**
* Inject a snippet of JavaScript into the page for execution in the context of the currently selected frame.
* The executed script is assumed to be asynchronous and must signal that is done by invoking
* the provided callback, which is always provided as the final argument to the function. The value
* to this callback will be returned to the client.
*/
executeAsync: <U extends any[], V extends U>(script: string | ((...arguments: V) => void), ...arguments: U) => Promise<any>;页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/68690193
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