Function reactiveMap

Create a new ReactiveMap.

Example

import { val, flatten } from "value-enhancer";
import { reactiveMap } from "value-enhancer/collections";

const map = reactiveMap();
const v = val("someValue");
const item$ = flatten(map.$, map => map.get("someKey")); // watch the item at "someKey"

console.log(item$.value); // undefined
map.set("someKey", v);
console.log(item$.value); // "someValue"
v.set("someValue2");
console.log(item$.value); // "someValue2"
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