115 lines
2 KiB
TypeScript
115 lines
2 KiB
TypeScript
interface Props {
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name: string
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}
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interface Core {
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id: string
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}
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interface Instance extends Props, Core {}
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const defaults: Props = {
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name: 'Spot',
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}
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const core: Core = {
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id: '0',
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}
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class ClassInstance<T extends object = {}> implements Instance {
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id = '0'
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name = 'Spot'
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constructor(
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props: Partial<Props> &
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{ [K in keyof T]: K extends keyof Core ? never : T[K] }
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) {
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Object.assign(this, props)
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}
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}
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interface InstanceConstructor {
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new <T extends object = {}>(
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props: Partial<Props> &
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{ [K in keyof T]: K extends keyof Core ? never : T[K] }
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): Instance
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}
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function makeInstance<T extends object = {}>(
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props: Partial<Props> &
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{ [K in keyof T]: K extends keyof Core ? never : T[K] } &
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ThisType<ClassInstance>
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) {
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return new ClassInstance<T>({ ...defaults, ...props, ...core })
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}
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function getInstance<T extends object = {}>(
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props: Partial<Props> &
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{ [K in keyof T]: K extends keyof Core ? never : T[K] }
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) {
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return { ...defaults, ...props, ...core }
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}
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const instance = getInstance({
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name: 'Steve',
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age: 93,
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wag(this: Instance) {
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return this.name
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},
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})
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interface AnimalProps {
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name: string
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greet(this: Animal, name: string): string
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}
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interface AnimalCore {
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id: string
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sleep(this: Animal): void
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}
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interface Animal extends AnimalProps, AnimalCore {}
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const getAnimal = <T extends object>(
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props: Partial<AnimalProps> &
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{ [K in keyof T]: K extends keyof AnimalCore ? never : T[K] }
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): Animal & T => {
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return {
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// Defaults
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name: 'Animal',
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greet(name) {
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return 'Hey ' + name
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},
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// Overrides
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...props,
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// Core
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id: 'hi',
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sleep() {},
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}
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}
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const dog = getAnimal({
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name: 'doggo',
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greet(name) {
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return 'Woof ' + this.name
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},
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wag() {
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return 'wagging...'
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},
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})
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dog.greet('steve')
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dog.wag()
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dog.sleep()
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class ShapeTest {}
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const shapeTest = new ShapeTest()
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export default shapeTest
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type Greet = (name: string) => string
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const greet: Greet = (name: string | number) => {
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return 'hello ' + name
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}
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