@lifaon/rx-js-light/src/observer-observable-pair/build-in/source/built-in/replay-source/create-replay-source.mjs

Blazing fast Observables

import {freeze} from "../../../../../misc/helpers/freeze.mjs";
export function createReplaySource(source, maxNumberOfValues = Number.POSITIVE_INFINITY) {
  let values = [];
  const emit = value => {
    values.push(value);
    if (values.length > maxNumberOfValues) {
      values.shift();
    }
    source.emit(value);
  };
  const subscribe = emit => {
    for (let i = 0; i < values.length; i++) {
      emit(values[i]);
    }
    return source.subscribe(emit);
  };
  return freeze({
    ...source,
    getValues: () => {
      return values;
    },
    emit,
    subscribe
  });
}