fix: Separate ESM/CJS TS definitions (#121)

index.d.ts

@@ -77,7 +77,11 @@ declare class Long {
   /**
    * Returns a Long representation of the given string, written using the specified radix.
    */
-  static fromString(str: string, unsigned?: boolean | number, radix?: number): Long;
+  static fromString(
+    str: string,
+    unsigned?: boolean | number,
+    radix?: number
+  ): Long;
 
   /**
    * Creates a Long from its byte representation.
@@ -102,7 +106,14 @@ declare class Long {
   /**
    * Converts the specified value to a Long.
    */
-  static fromValue(val: Long | number | string | { low: number, high: number, unsigned: boolean }, unsigned?: boolean): Long;
+  static fromValue(
+    val:
+      | Long
+      | number
+      | string
+      | { low: number; high: number; unsigned: boolean },
+    unsigned?: boolean
+  ): Long;
 
   /**
    * Returns the sum of this and the specified Long.
@@ -443,4 +454,4 @@ declare class Long {
   xor(other: Long | number | string): Long;
 }
 
-export = Long; // compatible with `import Long from "long"`
+export default Long; // compatible with `import Long from "long"`

package.json

@@ -18,12 +18,17 @@
   "license": "Apache-2.0",
   "type": "module",
   "main": "umd/index.js",
-  "types": "index.d.ts",
+  "types": "umd/index.d.ts",
   "exports": {
     ".": {
-      "types": "./index.d.ts",
-      "import": "./index.js",
-      "require": "./umd/index.js"
+      "import": {
+        "default": "./index.js",
+        "types": "./index.d.ts"
+      },
+      "require": {
+        "default": "./umd/index.js",
+        "types": "./umd/index.d.ts"
+      }
     }
   },
   "scripts": {
@@ -40,6 +45,6 @@
     "README.md"
   ],
   "devDependencies": {
-    "esm2umd": "^0.2.0"
+    "esm2umd": "^0.2.1"
   }
 }