mobx-keystone/src/snapshot/fromPlainObjectSnapshot.ts

A MobX powered state management solution based on data trees with first class support for TypeScript, snapshots, patches and much more

import { observable, set } from "mobx"
import { tweakPlainObject } from "../tweaker/tweakPlainObject"
import { isPlainObject } from "../utils"
import { SnapshotInOfObject } from "./SnapshotOf"
import { SnapshotterAndReconcilerPriority } from "./SnapshotterAndReconcilerPriority"
import {
  FromSnapshotContext,
  internalFromSnapshot,
  observableOptions,
  registerSnapshotter,
} from "./fromSnapshot"

function fromPlainObjectSnapshot(sn: SnapshotInOfObject<any>, ctx: FromSnapshotContext): object {
  const plainObj = observable.object({}, undefined, observableOptions)

  const snKeys = Object.keys(sn)
  const snKeysLen = snKeys.length
  for (let i = 0; i < snKeysLen; i++) {
    const k = snKeys[i]
    const v = sn[k]
    // setIfDifferent not required
    set(plainObj, k, internalFromSnapshot(v, ctx))
  }
  return tweakPlainObject(plainObj, undefined, undefined, true, false)
}

/**
 * @internal
 */
export function registerFromPlainObjectSnapshotter() {
  registerSnapshotter(SnapshotterAndReconcilerPriority.PlainObject, (sn, ctx) => {
    if (isPlainObject(sn)) {
      return fromPlainObjectSnapshot(sn, ctx)
    }
    return undefined
  })
}