bug: functions.source missing error even though it's not missing#206

### Describe the Bug When running ``npm run build`` I get the following error: ``` error during build: Error: Error: Required "functions.source" field is missing from Firebase Configuration file. at parseFirebaseConfiguration (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/svelte-adapter-firebase/src/utils.js:164:9) at adapt (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/svelte-adapter-firebase/src/index.js:26:35) at adapt (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/@sveltejs/kit/src/core/adapt/index.js:28:8) at Object.handler (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/@sveltejs/kit/src/exports/vite/index.js:611:12) at async PluginDriver.hookParallel (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/rollup/dist/es/shared/rollup.js:23582:17) at async Object.close (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/rollup/dist/es/shared/rollup.js:24937:13) at async Promise.all (index 0) at async build (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/vite/dist/node/chunks/dep-5e7f419b.js:44352:13) at async CAC.<anonymous> (file:///Users/pieterseegers/Documents/Websites/Avatary/avatary/node_modules/vite/dist/node/cli.js:808:9) ``` It says that the functions.source field is missing from my firebase configuration file, but it's definitely there; ```json { "firestore": { "rules": "firestore.rules", "indexes": "firestore.indexes.json" }, "hosting": { "predeploy": "npm run build", "public": "build", "ignore": ["firebase.json", "**/.*", "**/node_modules/**"], "rewrites": [ { "source": "**", "function": "ssr", "region": "europe-west1" } ] }, "functions": [ { "codebase": "default", "ignore": ["node_modules", ".git", "firebase-debug.log", "firebase-debug.*.log"], "source": "build" } ], "storage": { "rules": "storage.rules" }, "emulators": { "functions": { "port": 5001 }, "firestore": { "port": 8000 }, "hosting": { "port": 5005 }, "storage": { "port": 9199 }, "ui": { "enabled": true }, "singleProjectMode": true } } ``` ### Steps to Reproduce 1. Added the adapter to svelte.config.js; ``` kit: { adapter: adapter({ }) }, ``` 2. Added a functions.source field 3. Got the error ### Expected Behaviour I think it should recognize this field, but I'm not 100% sure if I'm doing something wrong. ### svelte-adapter-firebase version 0.14.4 ### sveltejs/kit version 1.0.1