Remove unsupported is-subset-of package

docs/docs/Usage/configuration.md

@@ -25,7 +25,7 @@ Sets a `Content-Length` header on each response, with the exception of responses
 
 `{Boolean}` default: `false`
 
-Match calls that only partially match a specified body json. Uses the [is-subset](https://www.npmjs.com/package/is-subset) library under the hood, which implements behaviour the same as jest's [.objectContaining()](https://jestjs.io/docs/en/expect#expectobjectcontainingobject) method.
+Match calls that only partially match a specified body json. 
 
 ### allowRelativeUrls<sup>†</sup>
 

docs/docs/legacy-api/Usage/configuration.md

@@ -49,7 +49,7 @@ Configures behaviour when attempting to add a new route with the same name (or i
 
 `{Boolean}` default: `false`
 
-Match calls that only partially match a specified body json. Uses the [is-subset](https://www.npmjs.com/package/is-subset) library under the hood, which implements behaviour the same as jest's [.objectContaining()](https://jestjs.io/docs/en/expect#expectobjectcontainingobject) method.
+Match calls that only partially match a specified body json.
 
 ### warnOnFallback
 

packages/fetch-mock/package.json

@@ -24,7 +24,6 @@
 		"@types/glob-to-regexp": "^0.4.4",
 		"dequal": "^2.0.3",
 		"glob-to-regexp": "^0.4.1",
-		"is-subset-of": "^3.1.10",
 		"regexparam": "^3.0.0"
 	},
 	"repository": {

packages/fetch-mock/src/Matchers.ts

@@ -2,7 +2,6 @@ import { RouteConfig } from './Route.js';
 import { CallLog } from './CallHistory.js';
 import glob from 'glob-to-regexp';
 import * as regexparam from 'regexparam';
-import { isSubsetOf } from 'is-subset-of';
 import { dequal as isEqual } from 'dequal';
 import { normalizeHeaders, getPath, normalizeUrl } from './RequestUtils.js';
 
@@ -218,6 +217,26 @@ const getBodyMatcher: MatcherGenerator = (route) => {
 	};
 };
 
+const isSubsetOf = (
+	subset: Record<string, any>,
+	superset: Record<string, any>,
+): boolean => {
+	return Object.entries(subset).every(([key, val]) => {
+		if (!(key in superset)) return false;
+
+		if (Array.isArray(val)) {
+			return Array.isArray(superset[key]) && 
+				val.every(item => superset[key].includes(item));
+		}
+
+		if (typeof val === 'object' && val !== null) {
+			return isSubsetOf(val, superset[key]);
+		}
+
+		return superset[key] === val;
+	});
+};
+
 const getFunctionMatcher: MatcherGenerator = ({ matcherFunction }) =>
 	matcherFunction;