fix(pkg): add a default fallback export (#542)

Co-authored-by: wolfy1339 <webmaster@wolfy1339.com>

README.md

@@ -38,6 +38,12 @@ import { retry } from "@octokit/plugin-retry";
 </tbody>
 </table>
 
+> [!IMPORTANT]
+> As we use [conditional exports](https://nodejs.org/api/packages.html#conditional-exports), you will need to adapt your `tsconfig.json` by setting `"moduleResolution": "node16", "module": "node16"`.
+>
+> See the TypeScript docs on [package.json "exports"](https://www.typescriptlang.org/docs/handbook/modules/reference.html#packagejson-exports).<br>
+> See this [helpful guide on transitioning to ESM](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c) from [@sindresorhus](https://github.com/sindresorhus)
+
 ```js
 const MyOctokit = Octokit.plugin(retry);
 const octokit = new MyOctokit({ auth: "secret123" });

scripts/build.mjs

@@ -60,12 +60,15 @@ async function main() {
       {
         ...pkg,
         files: ["dist-*/**", "bin/**"],
-        main: "./dist-bundle/index.js",
         types: "./dist-types/index.d.ts",
         exports: {
           ".": {
             types: "./dist-types/index.d.ts",
             import: "./dist-bundle/index.js",
+            // Tooling currently are having issues with the "exports" field when there is no "default", ex: TypeScript, eslint, ncc, jest
+            // See https://github.com/octokit/core.js/issues/667#issuecomment-2037592361
+            // See https://github.com/octokit/plugin-retry.js/issues/541
+            default: "./dist-bundle/index.js",
           },
         },
         sideEffects: false,