env-proxy

uses proxies to simplify reading from process.env in node.

example

1import { ConnectionOptions } from '@mikro-orm/core';
2
3import env from '@rettgerst/env-proxy';
4
5let connection: ConnectionOptions;
6
7// typed as boolean | undefined
8const { VERCEL } = env.bool;
9
10if (VERCEL) {
11	// typed as string, will throw if not defined
12	const {
13		VERCEL_GIT_COMMIT_REF: branch,
14		VERCEL_ENV: stage,
15		DB_HOST: host,
16		DB_USER: user,
17		DB_PASSWORD: password
18	} = env.required.string;
19
20	// typed as number, parsed with parseInt, will throw if undefined or NaN
21	const { DB_PORT: port } = env.required.int;
22
23	let dbName: string;
24
25	if (stage === 'production') dbName = 'myapp-production';
26	else if (stage === 'preview') dbName = `myapp-preview-${branch}`;
27	else if (stage === 'development') dbName = `myapp-dev-${branch}`;
28	else throw new Error(`Unrecognized vercel deployment stage ${stage}`);
29
30	connection = { host, port, user, password, dbName };
31} else {
32	const { DB_HOST: host = 'localhost' } = env.string;
33	const { DB_USER: user, DB_PASSWORD: password } = env.required.string;
34
35	connection = {
36		dbName: 'myapp',
37		host,
38		user,
39		password
40	};
41}