// env-vars.d.ts
import envCmdRc from './.env-cmdrc.json';
type ENV_CMD_RC = typeof envCmdRc;

type Merge<A, B> = {
  [K in keyof A | keyof B]: K extends keyof A
    ? K extends keyof B
      ? string
      : string | undefined
    : K extends keyof B
    ? string | undefined
    : never;
};

type MergeEnvs<T extends object[]> = T extends [infer A, ...infer Rest]
  ? A extends object
    ? Rest extends object[]
      ? Merge<A, MergeEnvs<Rest>>
      : never
    : never
  : {};

type LOCAL_ENV_VARS = ENV_CMD_RC['local'];
type DEVELOPMENT_ENV_VARS = ENV_CMD_RC['development'];
type STAGING_ENV_VARS = ENV_CMD_RC['staging'];
type PRODUCTION_ENV_VARS = ENV_CMD_RC['production'];

type ENV_VARS = MergeEnvs<
  [LOCAL_ENV_VARS, DEVELOPMENT_ENV_VARS, STAGING_ENV_VARS, PRODUCTION_ENV_VARS]
>;

declare global {
  namespace NodeJS {
    interface ProcessEnv extends ENV_VARS {}
  }
}