sveltekit-firebase-adapter-bug

This repo is a reproduction of a bug when using SvelteKit with the svelte-adapter-firebase adapter.

The bug was identified as caused by this issue - sveltejs/kit#587 It is tracked in the adapter issue list with - jthegedus/svelte-adapter-firebase#22

This could be a bug with either the adapter (most likely) or SvelteKit. I cannot seem to identify the issue in the adapter itself

info:

@sveltejs/kit@1.0.0-next.54
svelte-adapter-firebase@0.5.1

➜ npx envinfo --system --npmPackages svelte,@sveltejs/kit --binaries --browsers
npx: installed 1 in 1.059s

  System:
    OS: Linux 5.8 Pop!_OS 20.10
    CPU: (8) x64 AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx
    Memory: 4.29 GB / 15.33 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 14.8.0 - ~/.asdf/installs/nodejs/14.8.0/bin/node
    npm: 6.14.7 - ~/.asdf/installs/nodejs/14.8.0/bin/npm
  Browsers:
    Chrome: 89.0.4389.82
    Firefox: 86.0
  npmPackages:
    @sveltejs/kit: ^1.0.0-next.54 => 1.0.0-next.54
    svelte: ^3.29.0 => 3.35.0

The bug

A second copy of the _app dir is created under .svelte/output/client/ and then copied on build to the adapter output.

Run these commands to observe:

pnpm install
pnpm run build
# run build a second time
pnpm run build

Output after first pnpm run build:

# .svelte/output/client/_app
assets/
chunks/
pages/
start-#####.js

# functions/svelteAdapterTest
app.mjs
handler.mjs
handler.mjs.map
index.js
style.css

# public
favicon.ico
robots.txt
_app/
	assets/
	chunks/
	pages/
	start-#####.js

Output after second pnpm run build:

# .svelte/output/client/_app
assets/
chunks/
pages/
start-#####.js
_app/**				< erroneous copy (contains assets/ chunks/ pages/ etc)
favicon.ico			< erroneous copy
robots.txt			< erroneous copy

# functions/svelteAdapterTest
app.mjs
handler.mjs
handler.mjs.map
index.js
style.css
robots.txt				< erroneous copy
favicon.ico				< erroneous copy
_app/*					< erroneous copy

# public
_app/
	assets/
	chunks/
	pages/
	start-#####.js
	_app/**					< erroneous copy
	robots.txt				< erroneous copy
	favicon.ico				< erroneous copy

For each time build command is run, another nested level is created.

Thoughts

Given a recursive copy of _app can be seen in .svelte/output/client/_app on each pnpm run build it seems to be a bug within SvelteKit itself.

I cannot reproduce with other adapters however. Perhaps it has something to do with functions/ being in the .gitignore?

original thoughts:

It seems one of builder.copy_static_files, builder.copy_client_files or builder.prerender is the root cause.

Testing the adapter

asdf install
pnpm run install
pnpm run build
pnpm run serve