Js - 从 env 文件中获取字符串变量

Question

I have this value in my env file:

REACT_APP_CHAIN_ID=56

and when I try to get the value of this variable in my file test.ts:

console.log("address : " + process.env.REACT_APP_CHAIN_ID);

I have undefined value?

Answer 1

Try with using typescript instead. Rename all your .js files into .ts . And use ts-node./index.ts instead.

But before that do not forget to install instances: npm install -g typescript ts-node or if you are using yarn: yarn add -DE typescript or just yarn add -D typescript then use npx tsc -init or simply tsc -init