Allow $schema property in json config files

packages/babel-core/src/config/files/configuration.ts

@@ -272,6 +272,8 @@ const readConfigJSON5 = makeStaticFileCache((filepath, content): ConfigFile => {
     throw new Error(`${filepath}: Expected config object but found array`);
   }
 
+  delete options["$schema"];
+
   return {
     filepath,
     dirname: path.dirname(filepath),

packages/babel-core/test/config-chain.js

@@ -1343,5 +1343,19 @@ describe("buildConfigChain", function () {
         });
       }).toThrow(/Preset \/\* your preset \*\/ requires a filename/);
     });
+
+    it("should not throw error on $schema property in json config files", () => {
+      const filename = fixture(
+        "config-files",
+        "babel-config-json-$schema-property",
+        "babel.config.json",
+      );
+      expect(() => {
+        babel.loadPartialConfig({
+          filename,
+          cwd: path.dirname(filename),
+        });
+      }).not.toThrow();
+    });
   });
 });

packages/babel-core/test/fixtures/config/config-files/babel-config-json-$schema-property/babel.config.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://json.schemastore.org/babelrc"
+}