是否可以在 npm 脚本中使用 .env 包中的环境变量

Question

I have dotenv installed in my cypress project and variables in .env file, which looks like this:

USER=Admin 

Is there a way for me to use my env variable USER inside of the npm scripts?

  "scripts": {
    "cypress:open": "npx cypress open --env grepTags=USER"
  },

Answer 1

I did a bit of searching and found this related StackOverflow thread that may help you: How to use environment variables in package.json

I believe it should be possible to parse the JSON with the fs module, traverse the JavaScript object, insert your env variable in a separate script, and write to the file system the same package.json but with the env variable included. This may be a poor solution though because it will probably need to be run following every change to the contents of the .env file ...

 const fs = require("fs"); require("dotenv").config(); const myVar = process.env.MY_ENV_VAR; let rawJson = fs.readFileSync("package.json"); let parsed = JSON.parse(rawJson); parsed.scripts.start = myVar; // or whatever string defines your script let backToJson = JSON.stringify(parsed); fs.writeFileSync("package.json", backToJson);