[TypeScript] Create Explicit and Readable Type Declarations with TypeScript mapped Type Modifiers(代码

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Using the optional “ +” sign together with mapped type modifiers, we can create more explicit and readable type declarations. We can also use the “ -” (minus) sign to remove optional declarations from properties.

For example, we have an interface:

interface IPet { name: string; age: number; favoritePark?: string }

There is two required props and one favoriatePark as optional prop.

From TypeScirpt 2.8, we are able to gereate a new interface based on existing one, and add or remove props:
For example we want to remove all the optional props, we can use ‘-‘: