Configuration examples

Config Plugin

@dxos/config provides plugins for a number of bundlers which allow the config to be loaded from yaml files at the package root rather than specified inline.

vite

vite.config.ts

import { defineConfig } from 'vite';
import { ConfigPlugin } from '@dxos/config/vite-plugin';

export default defineConfig({
  ...
  plugins: [
    ConfigPlugin({ root: __dirname }),
    ...
  ]
});

rollup

rollup.config.js

import { ConfigPlugin } from '@dxos/config/rollup-plugin';

export default {
  ...
  plugins: [
    ConfigPlugin({ root: __dirname }),
    ...
  ]
};

esbuild

import { build } from 'esbuild';
import { ConfigPlugin } from '@dxos/config/esbuild-plugin';

await build({
  ...
  bundle: true,
  plugins: [
    ConfigPlugin({ root: __dirname }),
    ...
  ]
})

This allows config to be defined using one or more of the follow functions:

Loading config defaults from a file

Any config included in the dx.yml file will be returned by Defaults.

import { Client, Config } from '@dxos/client';
import { Defaults } from '@dxos/config';

const _client = new Client({
  config: new Config(Defaults()),
});

Note

In a Node environment, Defaults loads from a config/default.yml file in your project.

Local development configuration

Often it is convenient to have different configuration presets for local development. For this purpose there is Local which will return any config included in the dx-local.yml file.

import { Client, Config } from '@dxos/client';
import { Defaults, Local } from '@dxos/config';

const _client = new Client({
  config: new Config(Local(), Defaults()),
});

Note

In a Node environment, Local is a no-op.

App configuration with environment variables

The config plugin provides an easy way to map environment variables to config values using the dx-env.yml file.

import { Client, Config } from '@dxos/client';
import { Defaults, Envs, Local } from '@dxos/config';

const _client = new Client({
  config: new Config(Envs(), Local(), Defaults()),
});

This file takes the following format:

LOG_FILTER:
  path: runtime.client.log.filter
  type: string

LOG_PREFIX:
  path: runtime.client.log.prefix
  type: string

DX_PERSIST:
  path: runtime.client.storage.persistence
  type: boolean

Loading app-specific environment variables

Bundlers such as Vite will automatically provide access to any enviroment variables prefixed with VITE_, however sometimes it’s not convenient to prefix every variable you need access to. The config plugin provides a way to load arbitrary enviroment variables at build time.

vite.config.ts

import { defineConfig } from 'vite';
import { ConfigPlugin } from '@dxos/config/vite-plugin';

export default defineConfig({
  ...
  plugins: [
    ConfigPlugin({
      root: __dirname,
      env: ['MY_ENV_VAR']
    }),
    ...
  ]
});

This can then be accessed at the config path runtime.app.env.MY_ENV_VAR.