Weird variable initialization issue

[yunylz]

Version

v16.18.1

Platform

Linux vmi700946 5.15.0-56-generic #62-Ubuntu SMP Tue Nov 22 19:54:14 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

module.exports = () => {

    let envConfig = require("dotenv").config().parsed || {};
    let localConfig = require("../config");

    let config = {
        ...localConfig,
        ...envConfig
    }
    
    // Check for required keys
    ["ENV", "ENVS"].forEach(k => {
        if (!config[k]) throw new Error(`${k} is missing from config and it is required.`)
    });

    // Check if enviroment is a valid one
    if (!config.ENVS.includes(config.ENV)) 
        throw new Error(`${config.ENV} is not an allowed enviroment.\nEnv must be one of these: ${config.ENVS.join(", ")}`)

    global.config = config;
}

On "Check for required keys" part, when the array is set straight on forEach, it will throw Cannot access 'config' before initialization in the loop.

If the array is set as a variable like this, it runs completely fine.

let arr = ["ENV", "ENVS"]
arr.forEach(k => {
        if (!config[k]) throw new Error(`${k} is missing from config and it is required.`)
});

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior?

No response

What do you see instead?

Additional information

No response

[mscdex]

Try adding a semicolon after config's declaration/assignment.

[aduh95]

You need a semicolon between your assignment of config and the array just after it – as is it’s interpreted as one instruction.