import type { GetICUArgs } from '@schummar/icu-type-parser';
import type { PrimitiveType } from 'intl-messageformat';

const message = `hello {firstName},
You have {nrMessages, number} new messages.
Your birthDate is {birthDate, date}.
Your friend called. {friendGender, select,
  male {He will call again later.}
  female {She will call again later.}
  other {They will call again later.}
}`;

type IcuArgsOptions = {
  ICUNumberArgument?: number;
  ICUDateArgument?: Date;
  ICUArgument?: PrimitiveType;
};

// ICU arguments and their types are inferred
type IcuParameters = GetICUArgs<typeof message, IcuArgsOptions>;

// "male" | "female" | "other" | (string & {})
type FriendGender = IcuParameters["friendGender"]

// No TS error
const params1: IcuParameters = {
  firstName: 'John',
  birthDate: new Date(),
  nrMessages: 10,
  friendGender: 'female', 
};

// TS errors
const params2: IcuParameters = { // <- misses properties `birthDate`, `friendGender`
  lastName: 'Smith', // <- `lastName` does not exist in type `IcuParameters`
  nrMessages: "10", // <- `string` is not assignable to `number`
};