Macro add_ts_content 

macro_rules! add_ts_content {
    ($decl:literal) => { ... };
}

Adds/appends the given string literal to wasm bindgen typescript bindings. This is just a sugar for wasm_bindgen typescript_custom_section, so the given text can be anything, from typescript comment to type declarations or any other valid .d.ts content.

Example:

// add some custom type to .d.ts bindings output
add_ts_content!("export type SomeType = { field: string; otherField: number };");

// add some comment to .d.ts bindings output
add_ts_content!("// this is some comment");