Take ESBuild into use

[joonas-fi]

--- a/frontend/main.tsx
+++ b/frontend/main.tsx
@@ -153,3 +153,5 @@ export function main(appElement: HTMLElement, config: GlobalConfig): void {
                makeRouter(r.hasRouteFor, (relativeUrl: string) => r.handle(relativeUrl, handlers)),
        );
 }
+
+(window as any).main = { main: main };

HTML entry doesn't need changes.

shim.js:

import jQuery from 'jquery/dist/jquery.slim.js';

export { jQuery };

Then:

cd frontend/
tsc --project .
esbuild --bundle main.js --inject:shim.js --outfile=../public/build.js --minify