fix(json-patch-diff): 🐛 allow string node type change

Author: streamich

src/json-patch-diff/Diff.ts

@@ -4,12 +4,6 @@ import * as line from '../util/diff/line';
 import {structHash} from '../json-hash';
 import type {Operation} from '../json-patch/codec/json/types';
 
-export class DiffError extends Error {
-  constructor(message: string = 'DIFF') {
-    super(message);
-  }
-}
-
 export class Diff {
   protected patch: Operation[] = [];
 
@@ -83,8 +77,8 @@ export class Diff {
   public diffAny(path: string, src: unknown, dst: unknown): void {
     switch (typeof src) {
       case 'string': {
-        if (typeof dst !== 'string') throw new DiffError();
-        this.diffStr(path, src, dst);
+        if (typeof dst == 'string') this.diffStr(path, src, dst);
+        else this.diffVal(path, src, dst);
         break;
       }
       case 'number':

src/json-patch-diff/__tests__/Diff.spec.ts

@@ -53,6 +53,11 @@ describe('obj', () => {
     assertDiff(src, dst);
   });
 
+  test('string key type change', () => {
+    assertDiff({foo: 'asdf'}, {foo: 123});
+    assertDiff({foo: 123}, {foo: 'asdf'});
+  });
+
   test('can insert new key', () => {
     const src = {};
     const dst = {foo: 'hello!'};
@@ -103,6 +108,11 @@ describe('obj', () => {
 });
 
 describe('arr', () => {
+  test('string element type change', () => {
+    assertDiff(['asdf'], [123]);
+    assertDiff([123], ['asdf']);
+  });
+
   test('can add element to an empty array', () => {
     const src: unknown[] = [];
     const dst: unknown[] = [1];