How to use the env-var.from function in env-var
To help you get started, we’ve selected a few env-var examples, based on popular ways it is used in public projects.
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RedHatWorkshops / dayinthelife-streaming / projects / module-0-ui-mobile-new / lib / config.js View on Github 
module.exports = (env) => {
assert(typeof env === 'object', 'config.js requires a process.env argument')
const { get } = from(env)
return {
HTTP_PORT: get('HTTP_PORT', 8080).asPortNumber(),
NODE_ENV: get('NODE_ENV').asString(),
LOG_LEVEL: get('LOG_LEVEL', 'info').asEnum(Object.values(pino.levels.labels)),
// Can be set to valid keycloak config for a "public" client
KEYCLOAK_CONFIG: get('KEYCLOAK_CONFIG').asJsonObject(),
// If keycloak is configured we also need a session secret.
// This will default to a random hex string if not set
SESSION_SECRET: get('SESSION_SECRET', randomSessionSecret).asString(),
// Ordering HTTP API base url, e.g http://orders.svc.local:8080/env-var
Verification, sanitization, and type coercion for environment variables in Node.js
