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 ArtistFunc type is an adapter to allow the use of ordinary function as Artist mutator.

The CardFaceFunc type is an adapter to allow the use of ordinary function as CardFace mutator.

The CardFunc type is an adapter to allow the use of ordinary function as Card mutator.

Condition is a hook condition function.

The PrintingFunc type is an adapter to allow the use of ordinary function as Printing mutator.

The PrintingImageFunc type is an adapter to allow the use of ordinary function as PrintingImage mutator.

The RulingFunc type is an adapter to allow the use of ordinary function as Ruling mutator.

The SetFunc type is an adapter to allow the use of ordinary function as Set mutator.