feat: add example for valueTypes

Author: himself65

examples/basic/pages/index.tsx

@@ -8,6 +8,9 @@ import {
 import type React from 'react'
 import { useCallback, useEffect, useState } from 'react'
 
+// this url is copied from: https://beta.reactjs.org/learn/passing-props-to-a-component
+const avatar = 'https://i.imgur.com/1bX5QH6.jpg'
+
 function aPlusB (a: number, b: number) {
   return a + b
 }
@@ -45,6 +48,7 @@ const example = {
   fn: aPlusB,
   string_number: '1234',
   timer: 0,
+  avatar,
   date: new Date('Tue Sep 13 2022 14:07:44 GMT-0500 (Central Daylight Time)')
 }
 
@@ -100,6 +104,14 @@ const IndexPage: React.FC = () => {
         indentWidth={indent}
         groupArraysAfterLength={groupArraysAfterLength}
         keyRenderer={KeyRenderer}
+        valueTypes={[
+          {
+            is: (value): value is string => typeof value === 'string' && value.startsWith('https://i.imgur.com'),
+            Component: (props) => {
+              return <img height='50px' src={props.value} alt={props.value}/>
+            }
+          }
+        ]}
         onChange={
           useCallback<JsonViewerOnChange>(
             (path, oldValue, newValue) => {

src/stores/typeRegistry.tsx

@@ -17,12 +17,19 @@ export function registerType<Value> (type: DataType<Value>) {
 }
 
 export function matchTypeComponents<Value> (value: Value): DataType<Value> {
+  let potential: DataType<Value> | undefined
   for (const T of typeRegistry) {
     if (T.is(value)) {
+      potential = T
+    }
+    if (typeof value === 'object' && value === null) {
       return T
     }
   }
-  throw new DevelopmentError('this is not possible')
+  if (potential === undefined) {
+    throw new DevelopmentError('this is not possible')
+  }
+  return potential
 }
 
 export function useTypeComponents (value: unknown) {