/**
 * Environment-variable helpers.
 *
 * `requireEnv(name)` returns the value of `process.env[name]` or throws with a
 * clear, actionable error if it is missing or empty. Use this instead of the
 * non-null assertion `process.env.X!`, which silently casts to `string` and
 * lets `undefined` flow into downstream code (e.g. Supabase client init),
 * producing opaque stack traces far from the root cause.
 */
export declare function requireEnv(name: string): string;