Index: node_modules/immer/src/utils/plugins.ts
===================================================================
--- node_modules/immer/src/utils/plugins.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/immer/src/utils/plugins.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,76 @@
+import {
+	ImmerState,
+	Patch,
+	Drafted,
+	ImmerBaseState,
+	AnyMap,
+	AnySet,
+	ArchType,
+	die
+} from "../internal"
+
+/** Plugin utilities */
+const plugins: {
+	Patches?: {
+		generatePatches_(
+			state: ImmerState,
+			basePath: PatchPath,
+			patches: Patch[],
+			inversePatches: Patch[]
+		): void
+		generateReplacementPatches_(
+			base: any,
+			replacement: any,
+			patches: Patch[],
+			inversePatches: Patch[]
+		): void
+		applyPatches_<T>(draft: T, patches: readonly Patch[]): T
+	}
+	MapSet?: {
+		proxyMap_<T extends AnyMap>(target: T, parent?: ImmerState): T
+		proxySet_<T extends AnySet>(target: T, parent?: ImmerState): T
+	}
+} = {}
+
+type Plugins = typeof plugins
+
+export function getPlugin<K extends keyof Plugins>(
+	pluginKey: K
+): Exclude<Plugins[K], undefined> {
+	const plugin = plugins[pluginKey]
+	if (!plugin) {
+		die(0, pluginKey)
+	}
+	// @ts-ignore
+	return plugin
+}
+
+export function loadPlugin<K extends keyof Plugins>(
+	pluginKey: K,
+	implementation: Plugins[K]
+): void {
+	if (!plugins[pluginKey]) plugins[pluginKey] = implementation
+}
+/** Map / Set plugin */
+
+export interface MapState extends ImmerBaseState {
+	type_: ArchType.Map
+	copy_: AnyMap | undefined
+	assigned_: Map<any, boolean> | undefined
+	base_: AnyMap
+	revoked_: boolean
+	draft_: Drafted<AnyMap, MapState>
+}
+
+export interface SetState extends ImmerBaseState {
+	type_: ArchType.Set
+	copy_: AnySet | undefined
+	base_: AnySet
+	drafts_: Map<any, Drafted> // maps the original value to the draft value in the new set
+	revoked_: boolean
+	draft_: Drafted<AnySet, SetState>
+}
+
+/** Patches plugin */
+
+export type PatchPath = (string | number)[]