fix: clear map creates invalid patches, fixes #663

__tests__/map-set.js

@@ -244,5 +244,27 @@ function runBaseTest(name, useProxies, autoFreeze, useListener) {
 			expect(map1.has("key")).toBe(true)
 			expect(map1.get("key")).toBe(undefined)
 		})
+
+		test("#663 - clear map", () => {
+			const map = new Map([
+				["a", "b"],
+				["b", "c"]
+			])
+			const result = produceWithPatches(map, draft => {
+				draft.clear()
+			})
+
+			expect(result).toEqual([
+				new Map(),
+				[
+					{op: "remove", path: ["a"]},
+					{op: "remove", path: ["b"]}
+				],
+				[
+					{op: "add", path: ["a"], value: "b"},
+					{op: "add", path: ["b"], value: "c"}
+				]
+			])
+		})
 	})
 }

src/plugins/mapset.ts

@@ -15,7 +15,8 @@ import {
 	markChanged,
 	ProxyTypeMap,
 	ProxyTypeSet,
-	die
+	die,
+	each
 } from "../internal"
 
 export function enableMapSet() {
@@ -110,6 +111,9 @@ export function enableMapSet() {
 			prepareMapCopy(state)
 			markChanged(state)
 			state.assigned_ = new Map()
+			each(state.base_, key => {
+				state.assigned_!.set(key, false)
+			})
 			return state.copy_!.clear()
 		}