Question: How to use with Expo

[FleetAdmiralJakob]

I saw that this library supports expo but does not know how to implement it.

[drazik]

I don't know if I'm doing this right, but here is what I did and is working:

• create a env.ts file with my environment variables schema:

import { createEnv } from "@t3-oss/env-core"
import { z } from "zod"

export const env = createEnv({
	clientPrefix: "EXPO_PUBLIC_",
	client: {
		EXPO_PUBLIC_GOOGLE_MAPS_API_KEY: z.string().min(1),
		EXPO_PUBLIC_API_BASE_URL: z.string().url(),
	},
	runtimeEnv: {
		EXPO_PUBLIC_GOOGLE_MAPS_API_KEY:
			process.env.EXPO_PUBLIC_GOOGLE_MAPS_API_KEY,
		EXPO_PUBLIC_API_BASE_URL: process.env.EXPO_PUBLIC_API_BASE_URL,
	},
})

• create a .env file that contains all my environment variables with fake values: this file is versioned as a reference for all the environment variables that should be filled in the project
• create a .env.local file that contains the environment variables with real values: this file in git ignored

Then use the env object

import { env } from "@/env"

env.EXPO_PUBLIC_GOOGLE_MAPS_API_KEY

I hope it helps!

[tyeetale]

also, I found a typescript issue when importing, so I added:

"@t3-oss/env-core": ["./node_modules/@t3-oss/env-core/dist/index.d.ts"]

to the paths section in tsconfig.json:

{
  "extends": "expo/tsconfig.base",
  "compilerOptions": {
    "strict": true,
    "module": "ESNext",
    "paths": {
      "@t3-oss/env-core": ["./node_modules/@t3-oss/env-core/dist/index.d.ts"]
    }
  },
  "include": ["**/*.ts", "**/*.tsx"]
}

[juliusmarminge]

also, I found a typescript issue when importing, so I added:

That's most likely related to a bad moduleResolution setting in your tsconfig (or the expo base config you're extending from) See #189, #190, #191, #195 etc