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import { IOptional, Either, Optional, type IEither } from '@emprespresso/pengueno';
export const getEnv = <V extends string>(name: string): IOptional<V> => Optional.from(<V>process.env[name]);
export const getRequiredEnv = <V extends string>(name: string): IEither<Error, V> =>
Either.fromFailable(() => getEnv<V>(name).get()).mapLeft(
() => new Error(`environment variable "${name}" is required D:`),
);
type ObjectFromList<T extends ReadonlyArray<string>, V = string> = {
[K in T extends ReadonlyArray<infer U> ? U : never]: V;
};
export const getRequiredEnvVars = <V extends string>(vars: Array<V>) => {
type Environment = ObjectFromList<typeof vars>;
const emptyEnvironment = Either.right<Error, Environment>(<Environment>{});
const addTo = (env: Environment, key: V) => (val: string) =>
<Environment>{
...env,
[key]: val,
};
return Either.joinRight<V, Error, Environment>(
vars,
(envVar: V, environment: Environment) => getRequiredEnv(envVar).mapRight(addTo(environment, envVar)),
emptyEnvironment,
);
};
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