Drop Babel in favor of esm and TypeScript (#1726)

To get some meaningful errors during feature development, I thought it'd be useful to use TypeScript on `features.js` only, hoping to keep it contained to that file.

@sindresorhus suggested we just extend it the whole extension and maybe that can be done incrementally, without having to necessarily use types on everything.

1 files changed, 23 insertions, 0 deletions

diff --git a/source/features/extend-diff-expander.tsx b/source/features/extend-diff-expander.tsx
new file mode 100644
index 00000000..d9780053
--- /dev/null
+++ b/source/features/extend-diff-expander.tsx
@@ -0,0 +1,23 @@
+import select from 'select-dom';
+import delegate from 'delegate';
+import features from '../libs/features';
+
+function expandDiff(event) {
+	// Skip if the user clicked directly on the icon
+	if (!event.target.closest('.js-expand')) {
+		select('.js-expand', event.delegateTarget).click();
+	}
+}
+
+function init() {
+	delegate('.diff-view', '.js-expandable-line', 'click', expandDiff);
+}
+
+features.add({
+	id: 'extend-diff-expander',
+	include: [
+		features.isPRFiles
+	],
+	load: features.onAjaxedPages,
+	init
+});