Contents

# Working with Duck-Typed Interfaces

Liberal use of [the `structural`
attribute](./attributes/on-js-imports/structural.html) on imported methods,
getters, and setters allows you to define duck-typed interfaces. A duck-typed
interface is one where many different JavaScript objects that don't share the
same base class in their prototype chain and therefore are not `instanceof` the
same base can be used the same way.

## Defining a Duck-Typed Interface in Rust

```rust
{{#include ../../../examples/duck-typed-interfaces/src/lib.rs}}
```

## JavaScript Usage

```js
{{#include ../../../examples/duck-typed-interfaces/duck-typed-interfaces.js}}
```

Version data entries

30 entries across 30 versions & 1 rubygems

Version	Path
wasmtime-23.0.2	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-22.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-21.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-20.0.2	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-20.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-18.0.3	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-17.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-17.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-16.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-15.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-15.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.89/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-14.0.4	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-14.0.3	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-14.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-14.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-13.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-12.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-12.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-11.0.0	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md
wasmtime-10.0.1	./ext/cargo-vendor/wasm-bindgen-0.2.87/guide/src/reference/working-with-duck-typed-interfaces.md