Function getConfig

This function calls every function from the configuration object and tries to stores the result in the new config object. Validation errors are returned in the validationErrors variable. The definition object should consist of only functions without parameters which get the value from the process.env variables and validates them. The suggested way is to use the 'env-var' library.

Example

import { from } from 'env-var';

export const getConfigDefinitions = (
  variables: NodeJS.ProcessEnv = process.env,
) => {
  const env = from(variables);

  return {
   environment: () => env.get('NODE_ENV').required().asEnum(['development', 'production', 'test']),
   serviceId: () => env.get('SERVICE_ID').required().asString(),
   port: () => env.get('PORT').default(10100).asPortNumber(),
   // many more...
  }
}

// Use the following where the configuration is needed
const configDefinitions = getConfigDefinitions();
const config = getConfig(configDefinitions);
if (config.validationErrors.length === 0) {...}
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