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## Complete Example Rust ``` use macroforge_ts::macros::{ts_macro_derive, body}; use macroforge_ts::ts_syn::{     Data, DeriveInput, FieldIR, MacroforgeError, TsStream, parse_ts_macro_input, }; // Helper function to check if a field has a decorator fn has_decorator(field: &FieldIR, name: &str) -> bool {     field.decorators.iter().any(|d| d.name.eq_ignore_ascii_case(name)) } #[ts_macro_derive(     Validate,     description = "Generates a validate() method",     attributes(validate) )] pub fn derive_validate(mut input: TsStream) -> Result<TsStream, MacroforgeError> {     let input = parse_ts_macro_input!(input as DeriveInput);     match &input.data {         Data::Class(class) => {             let validations: Vec<_> = class.fields()                 .iter()                 .filter(|f| has_decorator(f, "validate"))                 .collect();             Ok(body! {                 validate(): string[] {                     const errors: string[] = [];                     {#for field in validations}                         if (!this.@{field.name}) {                             errors.push("@{field.name} is required");                         }                     {/for}                     return errors;                 }             })         }         _ => Err(MacroforgeError::new(             input.decorator_span(),             "@derive(Validate) only works on classes",         )),     } } ``` ## Next Steps * [Learn the template syntax](../../docs/custom-macros/ts-quote)