verify-env-vars v1.0.1

env-vars-validator

Tiny TypeScript library to check for variables in your process env

Usage

The library has 2 exported functions: mandateEnvVariables and suggestEnvVariables.

They are both TypeScript type predicates which when returning true, indicate that the passed in keys are present on the passed in object.

import { mandateEnvVariables, suggestEnvVariables } from 'env-vars-validator';

if (!mandateEnvVariables(env, ['MANDATORY_VARIABLE'] as const)) {
  return;
}

// After our guard we know that MANDATORY_VARIABLE exsists on env, and ts intellisense will indicates as such
// We can use it safely without constantly telling ts that it's safe

suggestEnvVariables(env, ['OPTIONAL_FEATURE_FLAG_MISSING']);
// Won't quit the process, but will log to the console warning of the missing variables