## Interfaces Rust ``` pub struct InterfaceIR { pub name: String, pub span: SpanIR, pub body_span: SpanIR, pub type_params: Vec, pub heritage: Vec, // extends clauses pub decorators: Vec, pub fields: Vec, pub methods: Vec, } pub struct InterfaceFieldIR { pub name: String, pub span: SpanIR, pub ts_type: String, pub optional: bool, pub readonly: bool, pub decorators: Vec, } pub struct InterfaceMethodIR { pub name: String, pub span: SpanIR, pub type_params: Vec, pub params_src: String, pub return_type_src: String, pub optional: bool, pub decorators: Vec, } ```