NodeJS：无法通过带有 start-server-and-test 的包脚本设置 PERCY_TOKEN

Question

根据官方 guideline from percy，我一直在努力在本地测试运行上设置 PERCY_TOKEN 并通过 yarn.[=20= 触发它]

指南说：

$ PERCY_TOKEN=aaabbbcccdddeeefff PERCY_BRANCH=local npm test

我现在的尝试是这样的：

package.json


...
"scripts": {
    "start": "react-scripts -r @cypress/instrument-cra start",
    "start:silent": "BROWSER=none yarn start",
    "start:server": "start-server-and-test start:silent http://localhost:3000",
    "build": "react-scripts build",
    "eject": "react-scripts eject",
    "envGenerateExample": "cat .env | sed 's/=.*/=/g' > .env.example",
    "jest:test": "react-scripts test --env=jest-environment-jsdom-sixteen",
    "cy:run": " 'yarn start:server './node_modules/.bin/cypress run'",
    "cy:open": "yarn start:server './node_modules/.bin/cypress open'",
    "cy:ci": "yarn start:server cy:chrome",
    "cy:chrome": "cypress run --browser chrome --record",
    "percy:exec": "yarn percy exec -- cypress run",
    "cy:percy": "yarn start:server percy:exec",
    "percy:local": "PERCY_TOKEN=$(grep 'PERCY_TOKEN.*' .env | sed 's/.*=//'); PERCY_BRANCH=local;",
    "cy:percy:local": "yarn percy:local && yarn start:server percy:exec"
  },
...

$ yarn cy:percy:local

Compiled successfully!

You can now view playground in the browser.

  Local:            http://localhost:3000
  On Your Network:  http://192.168.1.163:3000

Note that the development build is not optimized.
To create a production build, use yarn build.

...

> playground@0.2.0 percy:exec /Users/norfeldt/Repos/playground
> yarn percy exec -- cypress run

warning From Yarn 1.0 onwards, scripts don't require "--" for options to be forwarded. In a future version, any explicit "--" will be forwarded as-is to the scripts.
$ /Users/norfeldt/Repos/playground/node_modules/.bin/percy exec cypress run
 ›   Warning: Skipping visual tests. PERCY_TOKEN was not provided.
...

TL;DR 解决方案

package.json


...
"scripts": {
    "start": "react-scripts -r @cypress/instrument-cra start",
    "start:silent": "BROWSER=none yarn start",
    "start:server": "start-server-and-test start:silent http://localhost:3000",
    ...
    "percy:local": "PERCY_TOKEN=$(grep 'PERCY_TOKEN.*' .env | sed 's/.*=//') PERCY_BRANCH=local yarn start:server 'percy exec cypress run'"
  },
...

Answer 1

yarn 在内部使用 sh 来执行脚本中给出的命令（cmd 在 windows 的情况下）- Source. This is very similar to what .

此处 && 由 shell 处理，因此您的命令 yarn percy:local && yarn start:server percy:exec 是运行作为 2 个独立的子进程。这意味着 yarn percy:local 运行s 在一个进程中并根据需要在其上下文中设置 env 变量但是第二个进程运行ning yarn start:server percy:exec 不知道 env 变量由进程 1 设置。

让我们看看 OS X 是如何处理的：

和&&

sh -c 'PERCY_TOKEN=asdfasdf; PERCY_BRANCH=local' &&  sh -c 'echo $PERCY_TOKEN'

这什么都不打印

没有&&

sh -c 'PERCY_TOKEN=asdfasdf; PERCY_BRANCH=local echo $PERCY_TOKEN'

这会打印 asdfasdf

我认为删除 cy:percy:local 中的 && 应该可以解决您的问题。

编辑：评论中讨论的针对您的特定情况的解决方案

如本答案第二点所述：Whosebug。com/a/37141993/8266093 我建议您运行此脚本的格式 ENV_KEY1=value1 ENV_KEY2=value2 command 在您的情况下变为 PERCY_TOKEN=$(grep 'PERCY_TOKEN.*' .env | sed 's/.*=//') PERCY_BRANCH=local yarn percy exec cypress run.除此之外，如果运行单独设置它不适合您，您也可以添加 start-server yarn 命令。

NodeJS：无法通过带有 start-server-and-test 的包脚本设置 PERCY_TOKEN

NodeJS: NOT able to set PERCY_TOKEN via package script with start-server-and-test

javascript

yarnpkg

visual-testing

cypress

percy

TL;DR 解决方案