Preparing for Production

Configuration Options

When you move your application to production, you need to perform all required configurations according to your production environment's specifics.

An application is built for production using the build script, and run in the production mode using the start script. By default, an application that runs in the production mode takes into account settings specifies in the prodConfig configuration object (the config.prod.js file). However, you can use other config structure as long as you properly register it in the run.js file.

An example config.prod.js file:

// config.prod.js
const prodConfig = {
  port: 3000,
  mode: 'production',
  readModelConnectors: {
    HackerNews: {
      module: '@resolve-js/readmodel-lite',
      options: {},
    },
  },
  jwtCookie: {
    name: 'jwt',
    maxAge: 31536000000,
  },
}

export default prodConfig

Configuring Adapters

Before you move your app into production, specify all required adapters in the production config.

Depending on your requirements, you may want to specify storage adapters for events, Read Model data and View Model snapshots.

The code below demonstrates how to set up a storage adapter on the example of an in-memory Read Model storage:

// config.prod.js
const prodConfig = {
  readModelConnectors: {
    HackerNews: {
      module: '@resolve-js/readmodel-lite',
      options: {},
    },
  },
  ...
}

Using Environment Variables

Use the declareRuntimeEnv function from the @resolve-js/scripts library to bind a configuration setting value to an environment variable:

// config.prod.js
import { declareRuntimeEnv } from '@resolve-js/scripts'
export default {
  readModelsConnectors: {
    HackerNews: {
      module: '@resolve-js/readmodel-postgresql',
      options: {
        databaseName: declareRuntimeEnv('RESOLVE_READMODEL_DATABASE_NAME'),
        host: declareRuntimeEnv('RESOLVE_READMODEL_CLUSTER_HOST'),
        port: declareRuntimeEnv('RESOLVE_READMODEL_CLUSTER_PORT'),
        user: declareRuntimeEnv('RESOLVE_USER_ID'),
        password: declareRuntimeEnv('RESOLVE_USER_PASSWORD'),
        database: 'postgres',
      },
    },
  },
  ...
}
export default prodConfig

This approach is useful when you need to assign settings that should not be included in application sources (e.g., authentication credentials or secret keys) or settings that should be defined by a server instance.