fix(exports): use types versions for old node bundlers (#88)

Author: ayuhito

package.json

@@ -14,6 +14,16 @@
 		".": "./dist/web/index.js",
 		"./fs": "./dist/fs/index.js"
 	},
+	"typesVersions": {
+		"*": {
+			"fs": [
+				"dist/fs/index.d.ts"
+			],
+			"*": [
+				"dist/web/index.d.ts"
+			]
+		}
+	},
 	"devDependencies": {
 		"@biomejs/biome": "2.2.5",
 		"@types/node": "^24.7.1",