Can you explain the significance of using '&' in the TypeScript statement 'export type T1 = object & ComponentOptions<T1, T2>'?

I am a newbie to TypeScript and currently exploring the source code of Vue. However, I'm a bit confused about the grammar used in the code snippet below. Can anyone explain what '&' means in the following code? Also, could someone guide me on how to find this information in the official documentation?

/**
 * This type should be used when an array of strings is used for a component's `props` value.
 */
export type ThisTypedComponentOptionsWithArrayProps<V extends Vue, Data, Methods, Computed, PropNames extends string> =
  object &
  ComponentOptions<V, DataDef<Data, Record<PropNames, any>, V>, Methods, Computed, PropNames[], Record<PropNames, any>> &
  ThisType<CombinedVueInstance<V, Data, Methods, Computed, Readonly<Record<PropNames, any>>>;
typescriptvue.js

Answer №1

The '&' symbol serves as an operator for forming Intersection Types.

An intersection type is a unique data type that includes properties from both types being intersected.

type A = {
  foo: string,
  bar: number,
}

type B = {
  baz: boolean,
  foo: string,
}

type C = A & B;
// type C = { foo: string, bar: number, baz: boolean }

To delve deeper into this concept, you can visit this resource:

https://www.typescriptlang.org/docs/handbook/unions-and-intersections.html#intersection-types

Additionally, more information can be found here:

https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-aliases

I trust this explanation has been beneficial to you!

Answer №2

Intersection type is a powerful feature that allows merging multiple types into one cohesive entity.

Take, for instance:

interface A {
    a: string;
}

interface B {
    b: boolean;
}

type C = A & B;

const value: C = {
    a: 'a',
    b: true
};

The type C seamlessly combines the properties of both interfaces A and B.

For more information, refer to the official documentation: https://www.typescriptlang.org/docs/handbook/unions-and-intersections.html#intersection-types

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