Compile all ES6+ syntax to ES5

Fixes flatpickr#2468.

Signed-off-by: Anders Kaseorg <[email protected]>

build.ts

@@ -219,10 +219,10 @@ async function start() {
     }
     const watcher = rollup.watch([getConfig({ dev: true })]);
 
-    function exit() {
+    const exit = function () {
       watcher.close();
       watchers.forEach((w) => w.close());
-    }
+    };
 
     //catches ctrl+c event
     process.on("SIGINT", exit);

src/plugins/scrollPlugin.ts

@@ -3,7 +3,7 @@ import { Instance } from "../types/instance";
 import { getEventTarget } from "../utils/dom";
 
 if (typeof window.CustomEvent !== "function") {
-  function CustomEvent(
+  const CustomEvent = function (
     typeArg: string,
     eventInitDict?: CustomEventInit
   ): CustomEvent {
@@ -20,7 +20,7 @@ if (typeof window.CustomEvent !== "function") {
       eventInitDict.detail
     );
     return evt;
-  }
+  };
 
   CustomEvent.prototype = window.Event.prototype;
 

src/utils/index.ts

@@ -6,8 +6,9 @@ export const int = (bool: boolean) => (bool === true ? 1 : 0);
 export function debounce<F extends Function>(fn: F, wait: number) {
   let t: NodeJS.Timeout;
   return function (this: any) {
+    const args = arguments;
     clearTimeout(t);
-    t = setTimeout(() => fn.apply(this, arguments), wait);
+    t = setTimeout(() => fn.apply(this, args), wait);
   };
 }
 

tsconfig.esm.json

@@ -3,7 +3,7 @@
     "include": ["src"],
     "compilerOptions": {
         "incremental": true,
-        "target": "es6",
+        "target": "es5",
         "module": "es2015",
         "outDir": "dist/esm"
     }

tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "strict": true,
     "noImplicitAny": true,
-    "target": "es2015",
+    "target": "es5",
     "module": "commonjs",
     "moduleResolution": "node",
     "noUnusedLocals": true,