Add Babel and TypeScript provider packages as optional peer dependencies

Author: kiancross

package-lock.json

@@ -138,5 +138,17 @@
 		"typescript": "^4.1.3",
 		"xo": "^0.37.1",
 		"zen-observable": "^0.8.15"
+	},
+	"peerDependencies": {
+		"@ava/babel": "*",
+		"@ava/typescript": "*"
+	},
+	"peerDependenciesMeta": {
+		"@ava/babel": {
+			"optional": true
+		},
+		"@ava/typescript": {
+			"optional": true
+		}
 	}
 }