core/html/forms/FormData.idl

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// https://xhr.spec.whatwg.org/#interface-formdata

typedef (File or USVString) FormDataEntryValue;

// TODO(foolip): Remove LegacyInterfaceTypeChecking, which allows for
// `append('name', null, 'filename')` and `set('name', null, 'filename')` to
// append/set null values instead of throwing. https://crbug.com/561338
[
    Constructor(optional HTMLFormElement form),
    Exposed=(Window,Worker),
    LegacyInterfaceTypeChecking
] interface FormData {
    void append(USVString name, USVString value);
    [CallWith=ScriptState] void append(USVString name, Blob value, optional USVString filename);
    [ImplementedAs=deleteEntry] void delete(USVString name);
    FormDataEntryValue? get(USVString name);
    sequence<FormDataEntryValue> getAll(USVString name);
    boolean has(USVString name);
    void set(USVString name, USVString value);
    void set(USVString name, Blob value, optional USVString filename);
    iterable<USVString, FormDataEntryValue>;
};