eastenluis

const mapItemSchema = new mongoose.Schema({
    name: String,
    location: {
        // It's important to define type within type field, because
        // mongoose use "type" to identify field's object type.
        type: {type: String, default: 'Point'},
        // Default value is needed. Mongoose pass an empty array to
        // array type by default, but it will fail MongoDB's pre-save
        // validation.
        coordinates: {type: [Number], default: [0, 0]}

Venryx

import {forwardRef, useImperativeHandle, ForwardRefExoticComponent, RefAttributes, Ref} from "react";

export type Handle<T> = T extends ForwardRefExoticComponent<RefAttributes<infer T2>> ? T2 : never;

export const Parent = (props: {})=> {
  let childHandle: Handle<typeof Child>;
  return (
    <div onClick={()=>childHandle.SayHi()}>
      <Child name="Bob" ref={c=>childHandle = c}/>
    </div>