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-rw-r--r--app/javascript/flavours/glitch/load_polyfills.js42
1 files changed, 42 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/load_polyfills.js b/app/javascript/flavours/glitch/load_polyfills.js
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+++ b/app/javascript/flavours/glitch/load_polyfills.js
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+// Convenience function to load polyfills and return a promise when it's done.
+// If there are no polyfills, then this is just Promise.resolve() which means
+// it will execute in the same tick of the event loop (i.e. near-instant).
+
+function importBasePolyfills() {
+  return import(/* webpackChunkName: "base_polyfills" */ './base_polyfills');
+}
+
+function importExtraPolyfills() {
+  return import(/* webpackChunkName: "extra_polyfills" */ './extra_polyfills');
+}
+
+function loadPolyfills() {
+  const needsBasePolyfills = !(
+    Array.prototype.includes &&
+    HTMLCanvasElement.prototype.toBlob &&
+    window.Intl &&
+    Number.isNaN &&
+    Object.assign &&
+    Object.values &&
+    window.Symbol &&
+    Promise.prototype.finally
+  );
+
+  // Latest version of Firefox and Safari do not have IntersectionObserver.
+  // Edge does not have requestIdleCallback.
+  // This avoids shipping them all the polyfills.
+  const needsExtraPolyfills = !(
+    window.AbortController &&
+    window.IntersectionObserver &&
+    window.IntersectionObserverEntry &&
+    'isIntersecting' in IntersectionObserverEntry.prototype &&
+    window.requestIdleCallback
+  );
+
+  return Promise.all([
+    needsBasePolyfills && importBasePolyfills(),
+    needsExtraPolyfills && importExtraPolyfills(),
+  ]);
+}
+
+export default loadPolyfills;