wit-bindgen-cli 0.57.1

CLI tool to generate bindings for WIT documents and the component model. 
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package foo:foo;

interface map-types {
  type names-by-id = map<u32, string>;
  type ids-by-name = map<string, u32>;
  type bytes-by-name = map<string, list<u8>>;
  type optional-values = map<string, option<u32>>;
  type nested-map = map<string, map<u32, string>>;

  record wrapped-map {
    values: names-by-id,
  }

  record map-value-record {
    x: u32,
    y: string,
  }

  variant map-or-string {
    as-map(names-by-id),
    as-string(string),
  }

  named-roundtrip: func(a: names-by-id) -> ids-by-name;
  inline-roundtrip: func(a: map<u32, string>, b: map<string, list<u8>>) -> tuple<map<string, u32>, map<string, list<u8>>>;
  nested-roundtrip: func(a: bytes-by-name) -> bytes-by-name;
  wrapped-roundtrip: func(a: wrapped-map) -> wrapped-map;
  option-map-roundtrip: func(a: optional-values) -> optional-values;
  nested-map-roundtrip: func(a: nested-map) -> nested-map;
  record-value-roundtrip: func(a: map<string, map-value-record>) -> map<string, map-value-record>;
  bool-key-roundtrip: func(a: map<bool, string>) -> map<bool, string>;
  char-key-roundtrip: func(a: map<char, u32>) -> map<char, u32>;
  variant-roundtrip: func(a: map-or-string) -> map-or-string;
  result-roundtrip: func(a: result<names-by-id, string>) -> result<names-by-id, string>;
  tuple-with-map: func(a: tuple<names-by-id, u64>) -> tuple<names-by-id, u64>;
}

world map-world {
  import map-types;
  export map-types;
}