nextfriday-nextjs

Client Components

Client components must use NEXT_PUBLIC_ prefix for environment variables.

```tsx

// Bad:

"use client";

const apiUrl = process.env.API_URL;

const secretKey = process.env.SECRET_KEY;

// Good:

"use client";

const apiUrl = process.env.NEXT_PUBLIC_API_URL;

const appName = process.env.NEXT_PUBLIC_APP_NAME;

const isDev = process.env.NODE_ENV === "development"; // NODE_ENV is OK

```

No Fallback Values

Disallow fallback values for environment variables. Fail explicitly instead.

```typescript

// Bad:

const apiUrl = process.env.API_URL || "http://localhost:3000";

const timeout = process.env.TIMEOUT ?? "5000";

// Good:

const apiUrl = process.env.API_URL;

const timeout = process.env.TIMEOUT;

if (!apiUrl) {

throw new Error("API_URL environment variable is required");

}

```

| Rule | Pattern |

| ---- | ------- |

| Client env vars | NEXT_PUBLIC_ prefix required |

| No env fallbacks | Throw error if missing |