I have declared the firebase bom in my toml file l...

# gradle

[jean]

I have declared the firebase bom in my toml file like so

[libraries]
firebase-BoM = { module = "com.google.firebase:firebase-bom", version = "32.4.1" }
firebase-crashlytics-gradle = { module = "com.google.firebase:firebase-crashlytics-gradle", version.ref = "firebaseCrashlyticsGradle" }
firebase-crashlytics-kts = { module = "com.google.firebase:firebase-crashlytics-ktx" }
firebase-functions = { module = "com.google.firebase:firebase-functions-ktx" }
firebase-appcheck-ktx = { module = "com.google.firebase:firebase-appcheck-ktx" }
firebase-appcheck-playintegrity = { module = "com.google.firebase:firebase-appcheck-playintegrity" }
firebase-appcheck-debug = { module = "com.google.firebase:firebase-appcheck-debug" }

[bundles]
firebase = [
    "firebase-BoM",
    "firebase-crashlytics-kts",
    "firebase-functions",
    "firebase-appcheck-ktx",
    "firebase-appcheck-playintegrity",
    "firebase-appcheck-debug"
]

But when I try to include it in my build.gradle.kts with _api_(platform(_libs_._bundles_.firebase)) I get the following error :

Cannot convert the provided notation to an object of type Dependency: [com.google.firebase:firebase-bom:32.4.1, com.google.firebase:firebase-crashlytics-ktx, com.google.firebase:firebase-functions-ktx, com.google.firebase:firebase-appcheck-ktx, com.google.firebase:firebase-appcheck-playintegrity, com.google.firebase:firebase-appcheck-debug].
The following types/formats are supported:
  - String or CharSequence values, for example 'org.gradle:gradle-core:1.0'.
  - Maps, for example [group: 'org.gradle', name: 'gradle-core', version: '1.0'].
  - FileCollections, for example files('some.jar', 'someOther.jar').
  - Projects, for example project(':some:project:path').
  - ClassPathNotation, for example gradleApi().

If I only use _api_(_libs_._bundles_.firebase) it works fine but the documentation uses platform and I don’t know what it actually do/imply.

What should I use here?

[Adam S]

the error message isn't really helpful, but platform() is basically only for Maven BOMs (docs), and is used to align the versions of dependencies contained in that BOM.

If you wanted to follow what the Firebase docs are using and use the version catalog, then you'd want to remove the BOM from the Firebase bundle, and use this in the build script:

implementation(platform(libs.firebase.BoM))
implementation(libs.bundles.firebase)

[jean]

Nice, thanks!