josdejong/mathjs

TypeError: Cannot read property 'prototype' of undefined when run in jest

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#1,898 创建于 2020年6月28日

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 (7 评论) (0 反应) (0 负责人)JavaScript (13,832 star) (1,298 fork)batch import
help wanted

描述

yarn jest --testPathPattern path/to/file
yarn run v1.22.4
$ D:\workspace\js\myproject\node_modules\.bin\jest --testPathPattern path/to/file
 FAIL  path/to/xxx.spec.ts
  ● Test suite failed to run

      ● Test suite failed to run

        TypeError: Cannot read property 'prototype' of undefined

      at Object.<anonymous>.createComplexClass.isClass (node_modules/mathjs/lib/type/complex/Complex.js:28:23)
      at assertAndCreate (node_modules/mathjs/lib/utils/factory.js:49:12)
      at Object.<anonymous> (node_modules/mathjs/lib/entry/pureFunctionsAny.generated.js:24:38)
      at Object.<anonymous> (node_modules/mathjs/lib/entry/mainAny.js:53:25)

It can be produced with the latest at least three versions. It works fine in my project when run the project by running npm run start. Why this is not working with jest.

贡献者指南

技术栈
javascriptnodejs
领域
testingbackend
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
basic knowledge of Jestunderstanding of JavaScript modules
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
Investigate how mathjs exports its factory functions (see lib/utils/factory.js) and how Jest resolves modules. The error occurs in Complex.js line 28, suggesting a circular dependency or missing export. Check Jest configuration for module transformation and whether mathjs is properly transpiled. Consider adding a Jest transform ignore pattern for node modules or checking if mathjs needs to be included in transformIgnorePatterns.