And groups conditions with the AND operator.

FixedError is a hook returning a fixed error.

HasAddedFields is a condition validating `.AddedField` on fields.

HasClearedFields is a condition validating `.FieldCleared` on fields.

HasFields is a condition validating `.Field` on fields.

HasOp is a condition testing mutation operation.

If executes the given hook under condition.

NewChain creates a new chain of hooks.

Not negates a given condition.

On executes the given hook only for the given operation.

Or groups conditions with the OR operator.

Reject returns a hook that rejects all operations that match op.

Unless skips the given hook only for the given operation.

Chain acts as a list of hooks and is effectively immutable.

The CloudFileFunc type is an adapter to allow the use of ordinary function as CloudFile mutator.

The CloudFileTagFunc type is an adapter to allow the use of ordinary function as CloudFileTag mutator.

Condition is a hook condition function.

The FileFunc type is an adapter to allow the use of ordinary function as File mutator.

The FileTagFunc type is an adapter to allow the use of ordinary function as FileTag mutator.

The StorageProviderFunc type is an adapter to allow the use of ordinary function as StorageProvider mutator.