fix: Library couldn't be imported as ES module (ftrackhq#92)

Author: jimmycallin

package.json

@@ -10,14 +10,15 @@
     "prepack": "yarn build",
     "prepublish": "yarn test"
   },
-  "main": "./dist/ftrack-javascript-api.umd.js",
+  "type": "module",
+  "main": "./dist/ftrack-javascript-api.umd.cjs",
   "module": "./dist/ftrack-javascript-api.es.js",
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
       "types": "./dist/index.d.ts",
       "import": "./dist/ftrack-javascript-api.es.js",
-      "require": "./dist/ftrack-javascript-api.umd.js"
+      "require": "./dist/ftrack-javascript-api.umd.cjs"
     }
   },
   "files": [
@@ -47,8 +48,7 @@
   "keywords": [
     "ftrack",
     "api",
-    "library",
-    "umd"
+    "library"
   ],
   "author": "ftrack",
   "license": "Apache-2.0",

vite.config.ts

@@ -15,7 +15,8 @@ export default defineConfig({
     lib: {
       entry: path.resolve(__dirname, "source/index.ts"),
       name: "ftrack-javascript-api",
-      fileName: (format) => `ftrack-javascript-api.${format}.js`,
+      fileName: (format) =>
+        `ftrack-javascript-api.${format}.${format === "umd" ? "cjs" : "js"}`,
     },
     rollupOptions: {
       // make sure to externalize deps that shouldn't be bundled