Client build may be longer than server build and trigger a race condition

[GauBen]

Environment and versions used

JSM 0.9

Steps to reproduce

Have a client build longer than the server build.

Right now the post-build hook is triggered when the server builds complete:

javascript-modules/vite-plugin/src/index.ts

Lines 11 to 18 in 1ba7ad1

	function buildSuccessPlugin(callback: () => void | Promise<void>): Plugin {
	return {
	name: "build-success-callback",
	async closeBundle(error) {
	if (!error) await callback();
	},
	};
	}

Because the client build may last longer, the yarn watch:callback command may run before the build completes

Desired Behavior

Ensure both builds complete before running the yarn watch:callback command

[GauBen]

QA will be done by @hduchesne on Luxe 👌