How can I execute a script with environment variable and execute with truffle

Question

I created a script to build hash so I usually executed that like this:

$ truffle develop
truffle(develop)> exec scripts/myScript.js

but my script now want to read from .env

SIGNER= "56443876ca1ea534cc8ddc422f8ab891690325d173916c528d76483681b97fd6"

this is my script

require('dotenv').config();
const fs = require("fs");
const readline = require("readline");
const Web3 = require("web3");
const web3 = new Web3(Web3.givenProvider || "http://127.0.0.1:7545");
console.log('AAA', process.env.SIGNER);

I am getting

AAA undefined

Answer 1

try this :

$ truffle init test-contract
$ cd test-contract
$ npm init -y
$ npm i web3 --save
$ npm i dotenv --save

create a file inside your test folder and write it (test-contract/test/1.test.js) : 1.test.js

require("dotenv").config();

const Web3 = require("web3");
const web3 = new Web3(Web3.givenProvider || "http://127.0.0.1:7545");
console.log("AAA", process.env.SIGNER);

then create .env file (test-contract/.env) and put following without space :

SIGNER="56443876ca1ea534cc8ddc422f8ab891690325d173916c528d76483681b97fd6"

finally run the (inside the test-contract folder)

$ truffle test

result :

Compiling your contracts...
===========================
> Compiling ./contracts/Migrations.sol
> Artifacts written to /tmp/test--11623-Aa2e6hYzLkeX
> Compiled successfully using:
   - solc: 0.8.10+commit.fc410830.Emscripten.clang

AAA 56443876ca1ea534cc8ddc422f8ab891690325d173916c528d76483681b97fd6


  0 passing (1ms)