Tiny TypeScript library to check for variables in your process env
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