fix(types): add backward compatible declarations

Author: pi0

basic.d.ts.ts

@@ -1 +1 @@
-export * from "./dist/index.basic";
+export * from "./dist/basic";

browser.d.ts.ts

@@ -1 +1 @@
-export * from "./dist/index.browser";
+export * from "./dist/browser";

core.d.ts

@@ -1 +1 @@
-export * from "./dist/index.core";
+export * from "./dist/core";

utils.d.ts

@@ -0,0 +1 @@
+export * from "./dist/utils";