[−][src]Struct sauron::prelude::JsValue
Representation of an object owned by JS.
A JsValue
doesn't actually live in Rust right now but actually in a table
owned by the wasm-bindgen
generated JS glue code. Eventually the ownership
will transfer into wasm directly and this will likely become more efficient,
but for now it may be slightly slow.
Implementations
impl JsValue
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pub const NULL: JsValue
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The null
JS value constant.
pub const UNDEFINED: JsValue
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The undefined
JS value constant.
pub const TRUE: JsValue
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The true
JS value constant.
pub const FALSE: JsValue
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The false
JS value constant.
pub fn from_str(s: &str) -> JsValue
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Creates a new JS value which is a string.
The utf-8 string provided is copied to the JS heap and the string will be owned by the JS garbage collector.
pub fn from_f64(n: f64) -> JsValue
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Creates a new JS value which is a number.
This function creates a JS value representing a number (a heap allocated number) and returns a handle to the JS version of it.
pub fn from_bool(b: bool) -> JsValue
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Creates a new JS value which is a boolean.
This function creates a JS object representing a boolean (a heap allocated boolean) and returns a handle to the JS version of it.
pub fn undefined() -> JsValue
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Creates a new JS value representing undefined
.
pub fn null() -> JsValue
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Creates a new JS value representing null
.
pub fn symbol(description: Option<&str>) -> JsValue
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Creates a new JS symbol with the optional description specified.
This function will invoke the Symbol
constructor in JS and return the
JS object corresponding to the symbol created.
pub fn as_f64(&self) -> Option<f64>
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Returns the f64
value of this JS value if it's an instance of a
number.
If this JS value is not an instance of a number then this returns
None
.
pub fn is_string(&self) -> bool
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Tests whether this JS value is a JS string.
pub fn as_string(&self) -> Option<String>
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If this JS value is a string value, this function copies the JS string
value into wasm linear memory, encoded as UTF-8, and returns it as a
Rust String
.
To avoid the copying and re-encoding, consider the
JsString::try_from()
function from js-sys
instead.
If this JS value is not an instance of a string or if it's not valid
utf-8 then this returns None
.
UTF-16 vs UTF-8
JavaScript strings in general are encoded as UTF-16, but Rust strings
are encoded as UTF-8. This can cause the Rust string to look a bit
different than the JS string sometimes. For more details see the
documentation about the str
type which contains a few
caveats about the encodings.
pub fn as_bool(&self) -> Option<bool>
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Returns the bool
value of this JS value if it's an instance of a
boolean.
If this JS value is not an instance of a boolean then this returns
None
.
pub fn is_null(&self) -> bool
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Tests whether this JS value is null
pub fn is_undefined(&self) -> bool
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Tests whether this JS value is undefined
pub fn is_symbol(&self) -> bool
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Tests whether the type of this JS value is symbol
pub fn is_object(&self) -> bool
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Tests whether typeof self == "object" && self !== null
.
pub fn is_function(&self) -> bool
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Tests whether the type of this JS value is function
.
pub fn is_truthy(&self) -> bool
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Tests whether the value is "truthy".
pub fn is_falsy(&self) -> bool
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Tests whether the value is "falsy".
Trait Implementations
impl AsRef<JsValue> for JsValue
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impl<T> AsRef<JsValue> for Closure<T> where
T: ?Sized,
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T: ?Sized,
impl AsRef<JsValue> for InputEvent
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impl AsRef<JsValue> for AnimationEvent
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impl AsRef<JsValue> for HtmlCollection
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impl AsRef<JsValue> for KeyboardEvent
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impl AsRef<JsValue> for Event
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impl AsRef<JsValue> for History
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impl AsRef<JsValue> for HashChangeEvent
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impl AsRef<JsValue> for UiEvent
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impl AsRef<JsValue> for Performance
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impl AsRef<JsValue> for HtmlTextAreaElement
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impl AsRef<JsValue> for NodeList
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impl AsRef<JsValue> for TransitionEvent
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impl AsRef<JsValue> for ScrollToOptions
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impl AsRef<JsValue> for Response
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impl AsRef<JsValue> for Worker
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impl AsRef<JsValue> for Text
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impl AsRef<JsValue> for EventTarget
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impl AsRef<JsValue> for MessageEvent
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impl AsRef<JsValue> for MouseEvent
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impl AsRef<JsValue> for Window
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impl AsRef<JsValue> for Document
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impl AsRef<JsValue> for Navigator
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impl AsRef<JsValue> for Node
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impl AsRef<JsValue> for HtmlInputElement
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impl AsRef<JsValue> for Float64Array
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impl AsRef<JsValue> for Int16Array
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impl AsRef<JsValue> for UriError
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impl AsRef<JsValue> for DataView
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impl AsRef<JsValue> for CompileError
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impl AsRef<JsValue> for Uint32Array
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impl AsRef<JsValue> for RegExp
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impl AsRef<JsValue> for Number
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impl AsRef<JsValue> for HtmlHeadElement
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impl AsRef<JsValue> for Memory
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impl AsRef<JsValue> for Module
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impl AsRef<JsValue> for Uint8ClampedArray
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impl AsRef<JsValue> for Symbol
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impl AsRef<JsValue> for Proxy
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impl AsRef<JsValue> for DateTimeFormat
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impl AsRef<JsValue> for Date
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impl AsRef<JsValue> for SyntaxError
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impl AsRef<JsValue> for Iterator
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impl AsRef<JsValue> for Uint8Array
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impl AsRef<JsValue> for Comment
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impl AsRef<JsValue> for Array
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impl AsRef<JsValue> for Promise
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impl AsRef<JsValue> for LinkError
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impl AsRef<JsValue> for Int32Array
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impl AsRef<JsValue> for Generator
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impl AsRef<JsValue> for RangeError
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impl AsRef<JsValue> for TypeError
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impl AsRef<JsValue> for Function
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impl AsRef<JsValue> for JsString
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impl AsRef<JsValue> for Error
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impl AsRef<JsValue> for Element
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impl AsRef<JsValue> for Map
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impl AsRef<JsValue> for RuntimeError
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impl AsRef<JsValue> for Collator
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impl AsRef<JsValue> for Int8Array
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impl AsRef<JsValue> for Instance
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impl AsRef<JsValue> for AsyncIterator
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impl AsRef<JsValue> for WeakMap
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impl AsRef<JsValue> for Uint16Array
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impl AsRef<JsValue> for Table
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impl AsRef<JsValue> for SharedArrayBuffer
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impl AsRef<JsValue> for Location
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impl AsRef<JsValue> for NumberFormat
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impl AsRef<JsValue> for Set
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impl AsRef<JsValue> for WeakSet
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impl AsRef<JsValue> for Float32Array
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impl AsRef<JsValue> for IteratorNext
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impl AsRef<JsValue> for ReferenceError
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impl AsRef<JsValue> for EvalError
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impl AsRef<JsValue> for ArrayBuffer
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impl AsRef<JsValue> for PluralRules
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impl AsRef<JsValue> for Boolean
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impl AsRef<JsValue> for CharacterData
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impl AsRef<JsValue> for Object
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impl AsRef<JsValue> for HtmlElement
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impl Clone for JsValue
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impl Debug for JsValue
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impl Drop for JsValue
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impl<'a> From<&'a String> for JsValue
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impl<'a, T> From<&'a T> for JsValue where
T: JsCast,
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T: JsCast,
impl<'a> From<&'a str> for JsValue
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impl From<AnimationEvent> for JsValue
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pub fn from(obj: AnimationEvent) -> JsValue
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impl From<Array> for JsValue
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impl From<ArrayBuffer> for JsValue
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pub fn from(obj: ArrayBuffer) -> JsValue
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impl From<AsyncIterator> for JsValue
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pub fn from(obj: AsyncIterator) -> JsValue
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impl From<Boolean> for JsValue
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impl From<CharacterData> for JsValue
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pub fn from(obj: CharacterData) -> JsValue
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impl From<Collator> for JsValue
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impl From<Comment> for JsValue
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impl From<CompileError> for JsValue
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pub fn from(obj: CompileError) -> JsValue
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impl From<DataView> for JsValue
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impl From<Date> for JsValue
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impl From<DateTimeFormat> for JsValue
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pub fn from(obj: DateTimeFormat) -> JsValue
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impl From<Document> for JsValue
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impl From<Element> for JsValue
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impl From<Error> for JsValue
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impl From<EvalError> for JsValue
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impl From<Event> for JsValue
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impl From<EventTarget> for JsValue
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pub fn from(obj: EventTarget) -> JsValue
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impl From<Float32Array> for JsValue
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pub fn from(obj: Float32Array) -> JsValue
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impl From<Float64Array> for JsValue
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pub fn from(obj: Float64Array) -> JsValue
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impl From<Function> for JsValue
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impl From<Generator> for JsValue
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impl From<Global> for JsValue
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impl From<HashChangeEvent> for JsValue
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pub fn from(obj: HashChangeEvent) -> JsValue
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impl From<History> for JsValue
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impl From<HtmlCollection> for JsValue
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pub fn from(obj: HtmlCollection) -> JsValue
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impl From<HtmlElement> for JsValue
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pub fn from(obj: HtmlElement) -> JsValue
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impl From<HtmlHeadElement> for JsValue
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pub fn from(obj: HtmlHeadElement) -> JsValue
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impl From<HtmlInputElement> for JsValue
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pub fn from(obj: HtmlInputElement) -> JsValue
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impl From<HtmlTextAreaElement> for JsValue
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pub fn from(obj: HtmlTextAreaElement) -> JsValue
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impl From<InputEvent> for JsValue
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pub fn from(obj: InputEvent) -> JsValue
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impl From<Instance> for JsValue
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impl From<Int16Array> for JsValue
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pub fn from(obj: Int16Array) -> JsValue
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impl From<Int32Array> for JsValue
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pub fn from(obj: Int32Array) -> JsValue
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impl From<Int8Array> for JsValue
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impl From<Iterator> for JsValue
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impl From<IteratorNext> for JsValue
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pub fn from(obj: IteratorNext) -> JsValue
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impl From<JsString> for JsValue
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impl From<JsValue> for Element
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impl From<JsValue> for InputEvent
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pub fn from(obj: JsValue) -> InputEvent
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impl From<JsValue> for EventTarget
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pub fn from(obj: JsValue) -> EventTarget
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impl From<JsValue> for History
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impl From<JsValue> for Navigator
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impl From<JsValue> for Location
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impl From<JsValue> for Performance
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pub fn from(obj: JsValue) -> Performance
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impl From<JsValue> for Document
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impl From<JsValue> for HtmlInputElement
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pub fn from(obj: JsValue) -> HtmlInputElement
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impl From<JsValue> for HtmlCollection
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pub fn from(obj: JsValue) -> HtmlCollection
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impl From<JsValue> for Worker
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impl From<JsValue> for HtmlTextAreaElement
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pub fn from(obj: JsValue) -> HtmlTextAreaElement
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impl From<JsValue> for HtmlElement
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pub fn from(obj: JsValue) -> HtmlElement
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impl From<JsValue> for Window
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impl From<JsValue> for CharacterData
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pub fn from(obj: JsValue) -> CharacterData
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impl From<JsValue> for AnimationEvent
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pub fn from(obj: JsValue) -> AnimationEvent
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impl From<JsValue> for TransitionEvent
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pub fn from(obj: JsValue) -> TransitionEvent
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impl From<JsValue> for MouseEvent
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pub fn from(obj: JsValue) -> MouseEvent
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impl From<JsValue> for HtmlHeadElement
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pub fn from(obj: JsValue) -> HtmlHeadElement
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impl From<JsValue> for UiEvent
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impl From<JsValue> for Response
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impl From<JsValue> for KeyboardEvent
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pub fn from(obj: JsValue) -> KeyboardEvent
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impl From<JsValue> for Event
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impl From<JsValue> for MessageEvent
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pub fn from(obj: JsValue) -> MessageEvent
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impl From<JsValue> for JsString
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impl From<JsValue> for NumberFormat
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pub fn from(obj: JsValue) -> NumberFormat
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impl From<JsValue> for SyntaxError
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pub fn from(obj: JsValue) -> SyntaxError
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impl From<JsValue> for LinkError
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impl From<JsValue> for Float32Array
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pub fn from(obj: JsValue) -> Float32Array
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impl From<JsValue> for AsyncIterator
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pub fn from(obj: JsValue) -> AsyncIterator
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impl From<JsValue> for UriError
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impl From<JsValue> for Uint8Array
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pub fn from(obj: JsValue) -> Uint8Array
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impl From<JsValue> for EvalError
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impl From<JsValue> for Error
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impl From<JsValue> for Node
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impl From<JsValue> for PluralRules
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pub fn from(obj: JsValue) -> PluralRules
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impl From<JsValue> for Array
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impl From<JsValue> for RegExp
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impl From<JsValue> for Iterator
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impl From<JsValue> for Date
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impl From<JsValue> for Set
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impl From<JsValue> for RangeError
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pub fn from(obj: JsValue) -> RangeError
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impl From<JsValue> for Uint32Array
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pub fn from(obj: JsValue) -> Uint32Array
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impl From<JsValue> for Promise
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impl From<JsValue> for WeakMap
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impl From<JsValue> for NodeList
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impl From<JsValue> for ReferenceError
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pub fn from(obj: JsValue) -> ReferenceError
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impl From<JsValue> for Proxy
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impl From<JsValue> for Module
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impl From<JsValue> for Table
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impl From<JsValue> for Uint8ClampedArray
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pub fn from(obj: JsValue) -> Uint8ClampedArray
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impl From<JsValue> for Object
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impl From<JsValue> for Map
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impl From<JsValue> for Instance
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impl From<JsValue> for WeakSet
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impl From<JsValue> for Number
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impl From<JsValue> for Text
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impl From<JsValue> for Boolean
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impl From<JsValue> for RuntimeError
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pub fn from(obj: JsValue) -> RuntimeError
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impl From<JsValue> for Symbol
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impl From<JsValue> for Function
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impl From<JsValue> for ArrayBuffer
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pub fn from(obj: JsValue) -> ArrayBuffer
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impl From<JsValue> for Int16Array
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pub fn from(obj: JsValue) -> Int16Array
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impl From<JsValue> for CompileError
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pub fn from(obj: JsValue) -> CompileError
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impl From<JsValue> for SharedArrayBuffer
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pub fn from(obj: JsValue) -> SharedArrayBuffer
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impl From<JsValue> for Uint16Array
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pub fn from(obj: JsValue) -> Uint16Array
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impl From<JsValue> for Float64Array
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pub fn from(obj: JsValue) -> Float64Array
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impl From<JsValue> for Comment
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impl From<JsValue> for Generator
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impl From<JsValue> for Memory
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impl From<JsValue> for TypeError
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impl From<JsValue> for Int32Array
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pub fn from(obj: JsValue) -> Int32Array
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impl From<JsValue> for DateTimeFormat
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pub fn from(obj: JsValue) -> DateTimeFormat
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impl From<JsValue> for IteratorNext
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pub fn from(obj: JsValue) -> IteratorNext
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impl From<JsValue> for Collator
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impl From<JsValue> for DataView
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impl From<JsValue> for Int8Array
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impl From<JsValue> for ScrollToOptions
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pub fn from(obj: JsValue) -> ScrollToOptions
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impl From<JsValue> for HashChangeEvent
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pub fn from(obj: JsValue) -> HashChangeEvent
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impl From<KeyboardEvent> for JsValue
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pub fn from(obj: KeyboardEvent) -> JsValue
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impl From<LinkError> for JsValue
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impl From<Location> for JsValue
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impl From<Map> for JsValue
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impl From<MaybeIterator> for JsValue
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impl From<Memory> for JsValue
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impl From<MessageEvent> for JsValue
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pub fn from(obj: MessageEvent) -> JsValue
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impl From<Module> for JsValue
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impl From<MouseEvent> for JsValue
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pub fn from(obj: MouseEvent) -> JsValue
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impl From<Navigator> for JsValue
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impl From<Node> for JsValue
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impl From<NodeList> for JsValue
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impl From<Number> for JsValue
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impl From<NumberFormat> for JsValue
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pub fn from(obj: NumberFormat) -> JsValue
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impl From<Object> for JsValue
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impl<T> From<Option<T>> for JsValue where
JsValue: From<T>,
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JsValue: From<T>,
impl From<Performance> for JsValue
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pub fn from(obj: Performance) -> JsValue
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impl From<PluralRules> for JsValue
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pub fn from(obj: PluralRules) -> JsValue
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impl From<Promise> for JsValue
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impl From<Proxy> for JsValue
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impl From<RangeError> for JsValue
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pub fn from(obj: RangeError) -> JsValue
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impl From<ReferenceError> for JsValue
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pub fn from(obj: ReferenceError) -> JsValue
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impl From<RegExp> for JsValue
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impl From<Response> for JsValue
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impl From<RuntimeError> for JsValue
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pub fn from(obj: RuntimeError) -> JsValue
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impl From<ScrollToOptions> for JsValue
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pub fn from(obj: ScrollToOptions) -> JsValue
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impl From<Set> for JsValue
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impl From<SharedArrayBuffer> for JsValue
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pub fn from(obj: SharedArrayBuffer) -> JsValue
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impl From<String> for JsValue
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impl From<Symbol> for JsValue
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impl From<SyntaxError> for JsValue
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pub fn from(obj: SyntaxError) -> JsValue
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impl From<Table> for JsValue
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impl From<Text> for JsValue
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impl From<TransitionEvent> for JsValue
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pub fn from(obj: TransitionEvent) -> JsValue
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impl From<TypeError> for JsValue
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impl From<UiEvent> for JsValue
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impl From<Uint16Array> for JsValue
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pub fn from(obj: Uint16Array) -> JsValue
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impl From<Uint32Array> for JsValue
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pub fn from(obj: Uint32Array) -> JsValue
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impl From<Uint8Array> for JsValue
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pub fn from(obj: Uint8Array) -> JsValue
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impl From<Uint8ClampedArray> for JsValue
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pub fn from(obj: Uint8ClampedArray) -> JsValue
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impl From<UriError> for JsValue
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impl From<WeakMap> for JsValue
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impl From<WeakSet> for JsValue
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impl From<Window> for JsValue
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impl From<Worker> for JsValue
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impl From<bool> for JsValue
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impl From<f32> for JsValue
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impl From<f64> for JsValue
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impl From<i16> for JsValue
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impl From<i32> for JsValue
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impl From<i8> for JsValue
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impl From<u16> for JsValue
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impl From<u32> for JsValue
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impl From<u8> for JsValue
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impl FromWasmAbi for JsValue
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type Abi = u32
The wasm ABI type that this converts from when coming back out from the ABI boundary. Read more
pub unsafe fn from_abi(js: u32) -> JsValue
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impl<'a> IntoWasmAbi for &'a JsValue
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type Abi = u32
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
pub fn into_abi(self) -> u32
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impl IntoWasmAbi for JsValue
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type Abi = u32
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
pub fn into_abi(self) -> u32
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impl JsCast for JsValue
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pub fn instanceof(_val: &JsValue) -> bool
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pub fn unchecked_from_js(val: JsValue) -> JsValue
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pub fn unchecked_from_js_ref(val: &JsValue) -> &JsValue
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fn has_type<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
fn dyn_into<T>(self) -> Result<T, Self> where
T: JsCast,
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T: JsCast,
fn dyn_ref<T>(&self) -> Option<&T> where
T: JsCast,
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T: JsCast,
fn unchecked_into<T>(self) -> T where
T: JsCast,
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T: JsCast,
fn unchecked_ref<T>(&self) -> &TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
where
T: JsCast,
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
T: JsCast,
fn is_instance_of<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
fn is_type_of(val: &JsValue) -> bool
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impl<'a> PartialEq<&'a String> for JsValue
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pub fn eq(&self, other: &&'a String) -> bool
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#[must_use]fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
impl<'a> PartialEq<&'a str> for JsValue
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pub fn eq(&self, other: &&'a str) -> bool
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#[must_use]fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
impl PartialEq<JsValue> for JsValue
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pub fn eq(&self, other: &JsValue) -> bool
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#[must_use]fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
impl PartialEq<String> for JsValue
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impl PartialEq<bool> for JsValue
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impl PartialEq<f32> for JsValue
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impl PartialEq<f64> for JsValue
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impl PartialEq<i16> for JsValue
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impl PartialEq<i32> for JsValue
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impl PartialEq<i8> for JsValue
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impl PartialEq<str> for JsValue
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impl PartialEq<u16> for JsValue
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impl PartialEq<u32> for JsValue
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impl PartialEq<u8> for JsValue
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impl RefFromWasmAbi for JsValue
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type Abi = u32
The wasm ABI type references to Self
are recovered from.
type Anchor = ManuallyDrop<JsValue>
The type that holds the reference to Self
for the duration of the
invocation of the function that has an &Self
parameter. This is
required to ensure that the lifetimes don't persist beyond one function
call, and so that they remain anonymous. Read more
pub unsafe fn ref_from_abi(js: u32) -> <JsValue as RefFromWasmAbi>::Anchor
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Auto Trait Implementations
impl RefUnwindSafe for JsValue
impl !Send for JsValue
impl !Sync for JsValue
impl Unpin for JsValue
impl UnwindSafe for JsValue
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow(&self) -> &TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ReturnWasmAbi for T where
T: IntoWasmAbi,
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T: IntoWasmAbi,
type Abi = <T as IntoWasmAbi>::Abi
Same as IntoWasmAbi::Abi
pub fn return_abi(self) -> <T as ReturnWasmAbi>::Abi
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,