Conditionnal type | TypeScript Community | Page 1

devout zodiac Jul 12, 2023, 6:37 PM

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use generics

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conditionals like that won't work

tropic shore Jul 12, 2023, 6:37 PM

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devout zodiac use generics

Can you give me an example?

devout zodiac Jul 12, 2023, 6:38 PM

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i mean, an example would be pretty much the entire thing

tropic shore Jul 12, 2023, 6:38 PM

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export abstract class DiscordSlashCommand<DataType> {
  /**
   *
   */
  readonly subcommands?:
    | Collection<string, DiscordSlashCommand<ApplicationCommandOptionData>>
    | undefined = undefined;
  /**
   *
   */
  abstract readonly data: DataType extends ApplicationCommandData
    ? ApplicationCommandData
    : ApplicationCommandOptionData;

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I tried something like that but it's not exactly what I want

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I'd like DataType to be optional for example

devout zodiac Jul 12, 2023, 6:39 PM

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export abstract class DiscordSlashCommand<T extends Collection<string, DiscordSlashCommand<null>> | null = Collection<string, DiscordSlashCommand<null>> | null> {
  abstract readonly subcommands: T
  abstract readonly data: T ...
}

tropic shore Jul 12, 2023, 6:42 PM

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devout zodiac ```ts export abstract class DiscordSlashCommand<T extends Collection<string, Dis...

Well, that doesn't work since data should be either ApplicationCommandData or ApplicationCommandOptionData

devout zodiac Jul 12, 2023, 6:43 PM

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you can specify that as a conditional after T

tropic shore Jul 12, 2023, 6:43 PM

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I'm also trying to understand this thing 🤔

devout zodiac Jul 12, 2023, 6:43 PM

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or an interface would probably be better

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wait no interface wouldn't work

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!hb generics

crimson vineBOT Jul 12, 2023, 6:45 PM

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Handbook

Generics

devout zodiac Jul 12, 2023, 6:45 PM

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btw ^

tropic shore Jul 12, 2023, 6:58 PM

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devout zodiac you can specify that as a conditional after `T`

Can you elaborate please ? I’m trying to understand

devout zodiac Jul 12, 2023, 7:15 PM

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T extends ... ? ... : ... kinda thing

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but you'll need a few to handle all the appropriate cases

tropic shore Jul 12, 2023, 7:23 PM

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Thank you!

tropic shore Jul 13, 2023, 10:01 AM

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Looks like it's not working...

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export abstract class DiscordSlashCommand<T extends Collection<string, DiscordSlashCommand<null>> | null = Collection<string, DiscordSlashCommand<null>> | null> {
  /**
   *
   */
  abstract readonly subcommands?: T;
  /**
   *
   */
  abstract readonly data: T extends Collection<string, DiscordSlashCommand>
    ? ApplicationCommandData
    : ApplicationCommandOptionData;

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Maybe I could just extend the class to create a DiscordSlashSubcommand and override the type?

#Conditionnal type