Use esbuild to produce JS

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diff --git a/bin/watch b/bin/watch
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+++ b/bin/watch
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+#!/usr/bin/env bash
+set -euo pipefail
+
+# Run server
+
+python -m http.server --directory public 8000 &
+trap "fuser -k 8000/tcp" EXIT
+
+# Watch TypeScript
+
+CHECK="echo Checking TypeScript… && tsc --checkJs"
+BUILD="esbuild --bundle src/main.ts --target=es2017 --outdir=public"
+watchexec \
+  --clear \
+  --watch src \
+  -- "$CHECK && $BUILD"