"(TypeScript) 对象字面量定义的类型别名\/接口"

Question

I am making some schema of JSON message to transfer between server & client, for serialization I created an object literal as a template such as below

type uint8 = number;

const schema1 = {
    type: 'object',
    fields: {
        type: { type: 'uint8' },
        title: { type: 'string', optional: true }
    }
};

// can below automatically defined by schema1?
type schema1Type = {
    type: number,
    title?: string
};

const data1: schema1Type = {
    type: 1,
    title: 'Hello World'
};

Answer 1

First of all, you're going to need to the type for your schema definitions. I'm thinking something like this:

interface SchemaOptional { optional?: boolean }

interface SchemaNumber extends SchemaOptional { type: 'uint8' | 'int8' | 'float' }
interface SchemaString extends SchemaOptional { type: 'string' }
interface SchemaObject extends SchemaOptional {
    type: 'object',
    fields: Record<string, SchemaEntry>
}

type SchemaEntry = SchemaObject | SchemaNumber | SchemaString