我想人们通常会一起使用Flow和Jest（和React），但Flow似乎并不了解Jest（或Jasmine）全局变量。当我将// @flow添加到我的测试中时，我得到如下的Flow错误：
src/__tests__/Thing-test.js:3
3: jest.unmock('../Thing')
^^^^ identifier `jest`. Could not resolve name
src/__tests__/Thing-test.js:7
7: describe('Thing', () => {
^^^^^^^^ identifier `describe`. Could not resolve name
src/__tests__/Thing-test.js:8
8: it('does stuff', () => {
^^ identifier `it`. Could not resolve name
我可以为Jest / Jasmine编写一个Flow接口，但这似乎很冗长，就像我必须遗漏一些东西。让流程node_modules/jest-cli似乎没有帮助。
答案 0 :(得分：31)
尽管Jest是使用流注释编写的，但它们会删除npm版本的类型，因此我们不需要babel来运行它。幸运的是，这些类型已经在 flow-type 中，所以解决方案非常简单（正如评论中所述）：
npm install -g flow-typed
flow-typed install jest@22.x.x # <-- replace the version with the latest
虽然我必须将这一行添加到我的.eslintrc.json：
{
"env": {
"jest": true
}
}
答案 1 :(得分：12)
如果您使用 Create-React-App ，则接受的答案无效。以下是如何使用CRA设置开玩笑：
1.安装项目流程
如果您使用create-reat-app，则here是此步骤的指南。
yarn add -D flow-bin
yarn run flow init
<强> 2。安装jest流类型
npx flow-typed install jest@22 // maybe you need a different version
（如果您使用create-react-app，可以使用npx jest -v检查您的开玩笑版本。）
第3。在config
中注册流式输入（更新：正如@Black在评论中指出的那样，这一步甚至可能不是必需的）
在.flowconfig中，将流式输入添加到libs部分。
...
[libs]
flow-typed
...
我使用纱线，npm应该是一样的。
答案 2 :(得分：7)
如果您使用create-react-app创建项目，则必须手动将 jest 添加到packages.json。否则，flow-typed将不会安装所需的类型定义，因为create-react-app不会将此依赖项添加到packages.json。
// auto generated from ./clext.py
#ifndef __CL_EXT__
#define __CL_EXT__
#include <stdio.h>
/*
* Given a cl code and return a string represenation
*/
const char* clGetErrorString(int errorCode) {
switch (errorCode) {
case 0: return "CL_SUCCESS";
case -1: return "CL_DEVICE_NOT_FOUND";
case -2: return "CL_DEVICE_NOT_AVAILABLE";
case -3: return "CL_COMPILER_NOT_AVAILABLE";
case -4: return "CL_MEM_OBJECT_ALLOCATION_FAILURE";
case -5: return "CL_OUT_OF_RESOURCES";
case -6: return "CL_OUT_OF_HOST_MEMORY";
case -7: return "CL_PROFILING_INFO_NOT_AVAILABLE";
case -8: return "CL_MEM_COPY_OVERLAP";
case -9: return "CL_IMAGE_FORMAT_MISMATCH";
case -10: return "CL_IMAGE_FORMAT_NOT_SUPPORTED";
case -12: return "CL_MAP_FAILURE";
case -13: return "CL_MISALIGNED_SUB_BUFFER_OFFSET";
case -14: return "CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST";
case -15: return "CL_COMPILE_PROGRAM_FAILURE";
case -16: return "CL_LINKER_NOT_AVAILABLE";
case -17: return "CL_LINK_PROGRAM_FAILURE";
case -18: return "CL_DEVICE_PARTITION_FAILED";
case -19: return "CL_KERNEL_ARG_INFO_NOT_AVAILABLE";
case -30: return "CL_INVALID_VALUE";
case -31: return "CL_INVALID_DEVICE_TYPE";
case -32: return "CL_INVALID_PLATFORM";
case -33: return "CL_INVALID_DEVICE";
case -34: return "CL_INVALID_CONTEXT";
case -35: return "CL_INVALID_QUEUE_PROPERTIES";
case -36: return "CL_INVALID_COMMAND_QUEUE";
case -37: return "CL_INVALID_HOST_PTR";
case -38: return "CL_INVALID_MEM_OBJECT";
case -39: return "CL_INVALID_IMAGE_FORMAT_DESCRIPTOR";
case -40: return "CL_INVALID_IMAGE_SIZE";
case -41: return "CL_INVALID_SAMPLER";
case -42: return "CL_INVALID_BINARY";
case -43: return "CL_INVALID_BUILD_OPTIONS";
case -44: return "CL_INVALID_PROGRAM";
case -45: return "CL_INVALID_PROGRAM_EXECUTABLE";
case -46: return "CL_INVALID_KERNEL_NAME";
case -47: return "CL_INVALID_KERNEL_DEFINITION";
case -48: return "CL_INVALID_KERNEL";
case -49: return "CL_INVALID_ARG_INDEX";
case -50: return "CL_INVALID_ARG_VALUE";
case -51: return "CL_INVALID_ARG_SIZE";
case -52: return "CL_INVALID_KERNEL_ARGS";
case -53: return "CL_INVALID_WORK_DIMENSION";
case -54: return "CL_INVALID_WORK_GROUP_SIZE";
case -55: return "CL_INVALID_WORK_ITEM_SIZE";
case -56: return "CL_INVALID_GLOBAL_OFFSET";
case -57: return "CL_INVALID_EVENT_WAIT_LIST";
case -58: return "CL_INVALID_EVENT";
case -59: return "CL_INVALID_OPERATION";
case -60: return "CL_INVALID_GL_OBJECT";
case -61: return "CL_INVALID_BUFFER_SIZE";
case -62: return "CL_INVALID_MIP_LEVEL";
case -63: return "CL_INVALID_GLOBAL_WORK_SIZE";
case -64: return "CL_INVALID_PROPERTY";
case -65: return "CL_INVALID_IMAGE_DESCRIPTOR";
case -66: return "CL_INVALID_COMPILER_OPTIONS";
case -67: return "CL_INVALID_LINKER_OPTIONS";
case -68: return "CL_INVALID_DEVICE_PARTITION_COUNT";
case -69: return "CL_INVALID_PIPE_SIZE";
case -70: return "CL_INVALID_DEVICE_QUEUE";
case -71: return "CL_INVALID_SPEC_ID";
case -72: return "CL_MAX_SIZE_RESTRICTION_EXCEEDED";
case -1002: return "CL_INVALID_D3D10_DEVICE_KHR";
case -1003: return "CL_INVALID_D3D10_RESOURCE_KHR";
case -1004: return "CL_D3D10_RESOURCE_ALREADY_ACQUIRED_KHR";
case -1005: return "CL_D3D10_RESOURCE_NOT_ACQUIRED_KHR";
case -1006: return "CL_INVALID_D3D11_DEVICE_KHR";
case -1007: return "CL_INVALID_D3D11_RESOURCE_KHR";
case -1008: return "CL_D3D11_RESOURCE_ALREADY_ACQUIRED_KHR";
case -1009: return "CL_D3D11_RESOURCE_NOT_ACQUIRED_KHR";
case -1010: return "CL_INVALID_DX9_MEDIA_ADAPTER_KHR";
case -1011: return "CL_INVALID_DX9_MEDIA_SURFACE_KHR";
case -1012: return "CL_DX9_MEDIA_SURFACE_ALREADY_ACQUIRED_KHR";
case -1013: return "CL_DX9_MEDIA_SURFACE_NOT_ACQUIRED_KHR";
case -1093: return "CL_INVALID_EGL_OBJECT_KHR";
case -1092: return "CL_EGL_RESOURCE_NOT_ACQUIRED_KHR";
case -1001: return "CL_PLATFORM_NOT_FOUND_KHR";
case -1057: return "CL_DEVICE_PARTITION_FAILED_EXT";
case -1058: return "CL_INVALID_PARTITION_COUNT_EXT";
case -1059: return "CL_INVALID_PARTITION_NAME_EXT";
case -1094: return "CL_INVALID_ACCELERATOR_INTEL";
case -1095: return "CL_INVALID_ACCELERATOR_TYPE_INTEL";
case -1096: return "CL_INVALID_ACCELERATOR_DESCRIPTOR_INTEL";
case -1097: return "CL_ACCELERATOR_TYPE_NOT_SUPPORTED_INTEL";
case -1000: return "CL_INVALID_GL_SHAREGROUP_REFERENCE_KHR";
case -1098: return "CL_INVALID_VA_API_MEDIA_ADAPTER_INTEL";
case -1099: return "CL_INVALID_VA_API_MEDIA_SURFACE_INTEL";
case -1100: return "CL_VA_API_MEDIA_SURFACE_ALREADY_ACQUIRED_INTEL";
case -1101: return "CL_VA_API_MEDIA_SURFACE_NOT_ACQUIRED_INTEL";
default: return "CL_UNKNOWN_ERROR";
}
}
/*
* check cl error, if not CL_SUCCESS, print to stderr
*/
int clCheckError(int errorCode) {
if (errorCode != 0) {
fprintf(stderr, "%s\n", clGetErrorString(errorCode));
}
return errorCode;
}
#endif /* __CL_EXT__*/
答案 3 :(得分：0)
我认为declare var jest: any;应该做的伎俩（把它放在每个测试文件的顶部，或者你的流程lib目录中的某个地方）。
答案 4 :(得分：0)
您也可以将其作为一个衬管运行。 在这里，您去了：
npm i -D flow-typed && npx flow-typed install jest@"$(npx jest -v)"