Typescript's default string types offer a versatile approach to defining string values

Question

Typescript's default string types offer a versatile approach to defining string values

Here is an example code snippet to consider:

type PredefinedStrings = 'test' | 'otherTest';

interface MyObject {
    type: string | PredefinedStrings;
}

The interface MyObject has a single property called type, which can be one of the predefined strings in PredefinedStrings or a custom string defined by the developer.

The goal is to allow developers to input any string for the type property while still showing predefined options as suggestions using IntelliSense. Is there a way to achieve this dual functionality?

typescript

Answer 1

Answer №1

Have you considered utilizing a string enum? It appears to be the native solution for achieving your desired outcome:

enum Options {
    OptionOne = 'one',
    OptionTwo = 'two'
}

By using a string enum, you can benefit from Intellisense autocompleting the enum values.

Answer 2

Have you considered utilizing a string enum? It appears to be the native solution for achieving your desired outcome:

enum Options {
    OptionOne = 'one',
    OptionTwo = 'two'
}

By using a string enum, you can benefit from Intellisense autocompleting the enum values.

Answer 3

Answer №2

Adding on to @kabanus' response:

If you want to fully customize your object, you can make MyObject a generic interface:

interface MyObject<T extends string> {
  type: T | CustomStrings;
}

This allows the consumer of the interface to define their own type like so:

enum NewEnum {
  OPTION1 = "OPTION1",
  OPTION2 = "OPTION2",
}

type CustomMyObject = MyObject<NewEnum>;

Answer 4

Adding on to @kabanus' response:

If you want to fully customize your object, you can make MyObject a generic interface:

interface MyObject<T extends string> {
  type: T | CustomStrings;
}

This allows the consumer of the interface to define their own type like so:

enum NewEnum {
  OPTION1 = "OPTION1",
  OPTION2 = "OPTION2",
}

type CustomMyObject = MyObject<NewEnum>;

Typescript's default string types offer a versatile approach to defining string values

Answer №1

Answer №2

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