src/util/env.util.ts
import fs from 'node:fs'
import type { ValuesOf } from '@naturalcycles/js-lib'
import 'dotenv/config' // ensure .env is read before requiring keys
/**
* @example
*
* const {a, b} = requreEnvKeys(['a', 'b'])
*
* Will throw if any of the passed keys is not defined.
*/
export function requireEnvKeys<T extends readonly string[]>(
...keys: T
): { [k in ValuesOf<T>]: string } {
// eslint-disable-next-line unicorn/no-array-reduce
return keys.reduce(
(r, k) => {
const v = process.env[k]
if (!v) throw new Error(`${k} env variable is required, but missing`)
r[k as ValuesOf<T>] = v
return r
},
{} as { [k in ValuesOf<T>]: string },
)
}
export function requireFileToExist(filePath: string): void {
if (!fs.existsSync(filePath)) {
throw new Error(`Required file should exist: ${filePath}`)
}
}