default
Deprecated
Tied to the deprecated addDefaultAssetSources helper. Once you migrate to Engine.asset.addLocalSourceFromJSON(contentUri) this returns null — track the base URI yourself. Will be removed in a future version.
Returns the base uri of the default asset sources that was previously passed to addDefaultAssetSources.
Important: Only addDefaultAssetSources writes this metadata key. Code that has migrated to Engine.asset.addLocalSourceFromJSON(contentUri) will not populate it; callers should track the base URI on their own side instead.