我已经这样做了两个小时了,但无法弄清楚我做错了什么。我有以下 Jest + puppeteer 测试:
import {convert} from '../__helpers__/number';
const getAmount = async (page) => {
const element = await page.waitForSelector('.my-element');
return element.evaluate((node) => convert(node.innerText));
}
这非常简单直接。但它一直失败并出现以下错误:
Error: Evaluation failed: ReferenceError: _number is not defined
at __puppeteer_evaluation_script__:2:15
at ExecutionContext._evaluateInternal (node_modules/puppeteer/lib/ExecutionContext.js:122:13)
-- ASYNC --
at ExecutionContext.<anonymous> (node_modules/puppeteer/lib/helper.js:111:15)
at ElementHandle.evaluate (node_modules/puppeteer/lib/JSHandle.js:55:42)
at ElementHandle.evaluate (node_modules/puppeteer/lib/helper.js:112:23)
at _callee$ (__tests__/e2e/test.spec.js:13:27)
at tryCatch (node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:45:40)
at Generator.invoke [as _invoke] (node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:271:22)
at Generator.prototype.(anonymous function) [as next] (node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:97:21)
at asyncGeneratorStep (__tests__/e2e/test.spec.js:30:103)
at _next (__tests__/e2e/test.spec.js:32:194)
上面的行号与源代码不匹配..并且从错误来看,它似乎是由于转译代码而失败。因此,我前往 jest-transform-cache
位置查看该文件,行号也不匹配;它们都偏离了 1。转译的代码也有更新的输出,并有以下行:
var _number = require('../__helpers__/number');
我尝试了所有我能想到的调试方式:
- 清除缓存
- 尝试重命名文件
- 重新启动系统
- 在不同的系统中运行测试
- 在没有缓存等的情况下运行 jest
也尝试过这个:
// import {convert} from '../__helpers__/number';
const convert = (text) => magic(text); // for simplicity's sake
const getAmount = async (page) => {
const element = await page.waitForSelector('.my-element');
return element.evaluate((node) => convert(node.innerText));
}
现在失败并出现以下错误:
Evaluation failed: ReferenceError: convert is not defined
at __puppeteer_evaluation_script__:2:15
at ExecutionContext._evaluateInternal (node_modules/puppeteer/lib/ExecutionContext.js:122:13)
.
:
我想我会把它扔在这里看看是否还有其他人遇到这种奇怪的情况。按照任何标准,它都不应该失败,而且我根本无法弄清楚。请帮我!任何想法/方向将不胜感激。
谢谢!
最佳答案
您需要将转换函数作为 elementHandle.evaluate(pageFunction[, ...args]) 的参数传递像这样:
import {convert} from '../__helpers__/number';
const getAmount = async (page) => {
const element = await page.waitForSelector('.my-element');
return element.evaluate((node, convert) => convert(node.innerText), convert);
}
关于javascript - 开 Jest - 引用错误 : imported function is not defined,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60217165/