ParsableType.ts

import {
    User,
    TextChannel,
    Channel,
    GuildChannel,
    DMChannel,
    VoiceChannel,
    CategoryChannel,
    NewsChannel,
    StoreChannel,
    Role,
} from "discord.js";

/** Name of parsable types. */
export type ParsableTypeName =
    | "string"
    | "boolean"
    | "integer"
    | "float"
    | "user"
    | "role"
    | "channel"
    | "guild channel"
    | "dm channel"
    | "text channel"
    | "voice channel"
    | "category channel"
    | "news channel"
    | "store channel";

/** Parsable types. */
export type ParsableType =
    | string
    | boolean
    | number
    | User
    | Role
    | Channel
    | GuildChannel
    | DMChannel
    | TextChannel
    | VoiceChannel
    | CategoryChannel
    | NewsChannel
    | StoreChannel;

/** @ignore */
export type ParsableTypeOf<
    Names extends ParsableTypeName | readonly ParsableTypeName[]
> = Names extends ParsableTypeName ? TypeName2Type<Names> : TypeName2Type<Exclude<Names, ParsableTypeName>[number]>;

/** @ignore */
type TypeName2Type<Name extends ParsableTypeName> = Name extends "string"
    ? string
    : Name extends "boolean"
    ? boolean
    : Name extends "integer"
    ? number
    : Name extends "float"
    ? number
    : Name extends "user"
    ? User
    : Name extends "role"
    ? Role
    : Name extends "channel"
    ? Channel
    : Name extends "guild channel"
    ? GuildChannel
    : Name extends "dm channel"
    ? DMChannel
    : Name extends "text channel"
    ? TextChannel
    : Name extends "voice channel"
    ? VoiceChannel
    : Name extends "category channel"
    ? CategoryChannel
    : Name extends "news channel"
    ? NewsChannel
    : Name extends "store channel"
    ? StoreChannel
    : never;