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buildDirectory

actually returns a

DirectoryProperty

, meaning it can actually be set to a different location. It uses the provider API so that it can be lazily. But, it's a good question why

projectDirectory

does not return a

Provider

but since it's read-only it doesn't need to be read lazily.

AFAIK,

projectDirectory

is not a Provider by design, because: • It always has a value (not optional) • It is set during the initialization phase (

settings.gradle

). So at the point you access it through

projectDirectory

, the value is already final.