Client error only in Safari, `Cannot access uninitialized variable.`

Describe the bug

Was instructed to create a new issue with repro from convo in #2889.

Reproduction

https://github.com/pheuter/safari-repro

Logs

[Error] ReferenceError: Cannot access uninitialized variable.
	handleError (client-manifest.js:16)
	handle_error (client.js:1692)
	(anonymous function) (client.js:1630)
	asyncFunctionResume
	(anonymous function)
	promiseReactionJobWithoutPromise
	promiseReactionJob

[Error] Unhandled Promise Rejection: ReferenceError: Cannot access uninitialized variable.
	(anonymous function) (start.js:38)
	asyncFunctionResume
	(anonymous function)
	promiseReactionJobWithoutPromise
	promiseReactionJob

System Info

System:
    OS: macOS 13.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 4.93 GB / 32.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 19.4.0 - /opt/homebrew/bin/node
    npm: 9.2.0 - /opt/homebrew/bin/npm
    Watchman: 2022.11.14.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 109.0.5414.87
    Safari: 16.2
  npmPackages:
    @sveltejs/adapter-node: 1.1.1 => 1.1.1
    @sveltejs/kit: 1.1.0 => 1.1.0
    svelte: 3.55.1 => 3.55.1
    vite: 4.0.4 => 4.0.4

Severity

blocking all usage of SvelteKit

Additional Information

Blocks all client-side usage of SvelteKit on latest versions of Safari.

Start with the Safari reproduction at https://github.com/pheuter/safari-repro and reproduce the error using the versions listed in the issue. Trace the reported locations in client-manifest.js, client.js, and start.js, comparing Safari with Chrome. Done means client-side SvelteKit usage works on the affected Safari version without either reported error.