Update task_all.ts to support treeshaking with esm.

When someone imports files from this library by using import statement, it will automatically use `index.esm.js` file without specifying `type: module` in index.js.

Currently typescript complains about the type If you directly import esm files which can be solved by specifying types.

should also resolve issue react-icons#154 without using all-files

packages/react-icons/scripts/task_all.ts

@@ -44,7 +44,16 @@ export async function dirInit({ DIST, LIB, rootDir }) {
       JSON.stringify(
         {
           sideEffects: false,
-          module: "./index.esm.js",
+          module: "./index.esm.js",,
+          "types": "./index.d.ts",
+          "exports": {
+            ".": {
+              "types": "./index.d.ts",
+              "import": "./index.esm.js",
+              "require": "./lib/index.js"
+            },
+            "./package.json": "./package.json"
+          },
         },
         null,
         2