kubernetes/staging/src/k8s.io/code-generator/cmd/client-gen/generators/generator_for_expansion.go

type genExpansion …

// We only want to call GenerateType() once per group.
func (g *genExpansion) Filter(c *generator.Context, t *types.Type) bool { … }

func (g *genExpansion) GenerateType(c *generator.Context, t *types.Type, w io.Writer) error { … }

var expansionInterfaceTemplate …