Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1800 insertions, 0 deletions

diff --git a/vendor/wasm-bindgen/src/lib.rs b/vendor/wasm-bindgen/src/lib.rs
new file mode 100644
index 000000000..2ccb284b9
--- /dev/null
+++ b/vendor/wasm-bindgen/src/lib.rs
@@ -0,0 +1,1800 @@
+//! Runtime support for the `wasm-bindgen` tool
+//!
+//! This crate contains the runtime support necessary for `wasm-bindgen` the
+//! attribute and tool. Crates pull in the `#[wasm_bindgen]` attribute through
+//! this crate and this crate also provides JS bindings through the `JsValue`
+//! interface.
+
+#![no_std]
+#![allow(coherence_leak_check)]
+#![doc(html_root_url = "https://docs.rs/wasm-bindgen/0.2")]
+
+use core::convert::TryFrom;
+use core::fmt;
+use core::marker;
+use core::mem;
+use core::ops::{
+    Add, BitAnd, BitOr, BitXor, Deref, DerefMut, Div, Mul, Neg, Not, Rem, Shl, Shr, Sub,
+};
+use core::u32;
+
+use crate::convert::{FromWasmAbi, WasmSlice};
+
+macro_rules! if_std {
+    ($($i:item)*) => ($(
+        #[cfg(feature = "std")] $i
+    )*)
+}
+
+macro_rules! externs {
+    ($(#[$attr:meta])* extern "C" { $(fn $name:ident($($args:tt)*) -> $ret:ty;)* }) => (
+        #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
+        $(#[$attr])*
+        extern "C" {
+            $(fn $name($($args)*) -> $ret;)*
+        }
+
+        $(
+            #[cfg(not(all(target_arch = "wasm32", not(target_os = "emscripten"))))]
+            #[allow(unused_variables)]
+            unsafe extern fn $name($($args)*) -> $ret {
+                panic!("function not implemented on non-wasm32 targets")
+            }
+        )*
+    )
+}
+
+/// A module which is typically glob imported from:
+///
+/// ```
+/// use wasm_bindgen::prelude::*;
+/// ```
+pub mod prelude {
+    pub use crate::JsValue;
+    pub use crate::UnwrapThrowExt;
+    #[doc(hidden)]
+    pub use wasm_bindgen_macro::__wasm_bindgen_class_marker;
+    pub use wasm_bindgen_macro::wasm_bindgen;
+
+    if_std! {
+        pub use crate::closure::Closure;
+    }
+
+    pub use crate::JsError;
+}
+
+pub mod convert;
+pub mod describe;
+
+mod cast;
+pub use crate::cast::{JsCast, JsObject};
+use convert::WasmOption;
+
+if_std! {
+    extern crate std;
+    use std::prelude::v1::*;
+    pub mod closure;
+    mod externref;
+
+    mod cache;
+    pub use cache::intern::{intern, unintern};
+}
+
+/// 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.
+pub struct JsValue {
+    idx: u32,
+    _marker: marker::PhantomData<*mut u8>, // not at all threadsafe
+}
+
+const JSIDX_OFFSET: u32 = 32; // keep in sync with js/mod.rs
+const JSIDX_UNDEFINED: u32 = JSIDX_OFFSET + 0;
+const JSIDX_NULL: u32 = JSIDX_OFFSET + 1;
+const JSIDX_TRUE: u32 = JSIDX_OFFSET + 2;
+const JSIDX_FALSE: u32 = JSIDX_OFFSET + 3;
+const JSIDX_RESERVED: u32 = JSIDX_OFFSET + 4;
+
+impl JsValue {
+    /// The `null` JS value constant.
+    pub const NULL: JsValue = JsValue {
+        idx: JSIDX_NULL,
+        _marker: marker::PhantomData,
+    };
+
+    /// The `undefined` JS value constant.
+    pub const UNDEFINED: JsValue = JsValue {
+        idx: JSIDX_UNDEFINED,
+        _marker: marker::PhantomData,
+    };
+
+    /// The `true` JS value constant.
+    pub const TRUE: JsValue = JsValue {
+        idx: JSIDX_TRUE,
+        _marker: marker::PhantomData,
+    };
+
+    /// The `false` JS value constant.
+    pub const FALSE: JsValue = JsValue {
+        idx: JSIDX_FALSE,
+        _marker: marker::PhantomData,
+    };
+
+    #[inline]
+    fn _new(idx: u32) -> JsValue {
+        JsValue {
+            idx,
+            _marker: marker::PhantomData,
+        }
+    }
+
+    /// 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.
+    #[inline]
+    pub fn from_str(s: &str) -> JsValue {
+        unsafe { JsValue::_new(__wbindgen_string_new(s.as_ptr(), s.len())) }
+    }
+
+    /// 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.
+    #[inline]
+    pub fn from_f64(n: f64) -> JsValue {
+        unsafe { JsValue::_new(__wbindgen_number_new(n)) }
+    }
+
+    /// Creates a new JS value which is a bigint from a string representing a number.
+    ///
+    /// This function creates a JS value representing a bigint (a heap
+    /// allocated large integer) and returns a handle to the JS version of it.
+    #[inline]
+    pub fn bigint_from_str(s: &str) -> JsValue {
+        unsafe { JsValue::_new(__wbindgen_bigint_from_str(s.as_ptr(), s.len())) }
+    }
+
+    /// 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.
+    #[inline]
+    pub fn from_bool(b: bool) -> JsValue {
+        if b {
+            JsValue::TRUE
+        } else {
+            JsValue::FALSE
+        }
+    }
+
+    /// Creates a new JS value representing `undefined`.
+    #[inline]
+    pub fn undefined() -> JsValue {
+        JsValue::UNDEFINED
+    }
+
+    /// Creates a new JS value representing `null`.
+    #[inline]
+    pub fn null() -> JsValue {
+        JsValue::NULL
+    }
+
+    /// 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 symbol(description: Option<&str>) -> JsValue {
+        unsafe {
+            match description {
+                Some(description) => JsValue::_new(__wbindgen_symbol_named_new(
+                    description.as_ptr(),
+                    description.len(),
+                )),
+                None => JsValue::_new(__wbindgen_symbol_anonymous_new()),
+            }
+        }
+    }
+
+    /// Creates a new `JsValue` from the JSON serialization of the object `t`
+    /// provided.
+    ///
+    /// **This function is deprecated**, due to [creating a dependency cycle in
+    /// some circumstances][dep-cycle-issue]. Use [`serde-wasm-bindgen`] or
+    /// [`gloo_utils::format::JsValueSerdeExt`] instead.
+    ///
+    /// [dep-cycle-issue]: https://github.com/rustwasm/wasm-bindgen/issues/2770
+    /// [`serde-wasm-bindgen`]: https://docs.rs/serde-wasm-bindgen
+    /// [`gloo_utils::format::JsValueSerdeExt`]: https://docs.rs/gloo-utils/latest/gloo_utils/format/trait.JsValueSerdeExt.html
+    ///
+    /// This function will serialize the provided value `t` to a JSON string,
+    /// send the JSON string to JS, parse it into a JS object, and then return
+    /// a handle to the JS object. This is unlikely to be super speedy so it's
+    /// not recommended for large payloads, but it's a nice to have in some
+    /// situations!
+    ///
+    /// Usage of this API requires activating the `serde-serialize` feature of
+    /// the `wasm-bindgen` crate.
+    ///
+    /// # Errors
+    ///
+    /// Returns any error encountered when serializing `T` into JSON.
+    #[cfg(feature = "serde-serialize")]
+    #[deprecated = "causes dependency cycles, use `serde-wasm-bindgen` or `gloo_utils::format::JsValueSerdeExt` instead"]
+    pub fn from_serde<T>(t: &T) -> serde_json::Result<JsValue>
+    where
+        T: serde::ser::Serialize + ?Sized,
+    {
+        let s = serde_json::to_string(t)?;
+        unsafe { Ok(JsValue::_new(__wbindgen_json_parse(s.as_ptr(), s.len()))) }
+    }
+
+    /// Invokes `JSON.stringify` on this value and then parses the resulting
+    /// JSON into an arbitrary Rust value.
+    ///
+    /// **This function is deprecated**, due to [creating a dependency cycle in
+    /// some circumstances][dep-cycle-issue]. Use [`serde-wasm-bindgen`] or
+    /// [`gloo_utils::format::JsValueSerdeExt`] instead.
+    ///
+    /// [dep-cycle-issue]: https://github.com/rustwasm/wasm-bindgen/issues/2770
+    /// [`serde-wasm-bindgen`]: https://docs.rs/serde-wasm-bindgen
+    /// [`gloo_utils::format::JsValueSerdeExt`]: https://docs.rs/gloo-utils/latest/gloo_utils/format/trait.JsValueSerdeExt.html
+    ///
+    /// This function will first call `JSON.stringify` on the `JsValue` itself.
+    /// The resulting string is then passed into Rust which then parses it as
+    /// JSON into the resulting value.
+    ///
+    /// Usage of this API requires activating the `serde-serialize` feature of
+    /// the `wasm-bindgen` crate.
+    ///
+    /// # Errors
+    ///
+    /// Returns any error encountered when parsing the JSON into a `T`.
+    #[cfg(feature = "serde-serialize")]
+    #[deprecated = "causes dependency cycles, use `serde-wasm-bindgen` or `gloo_utils::format::JsValueSerdeExt` instead"]
+    pub fn into_serde<T>(&self) -> serde_json::Result<T>
+    where
+        T: for<'a> serde::de::Deserialize<'a>,
+    {
+        unsafe {
+            let ret = __wbindgen_json_serialize(self.idx);
+            let s = String::from_abi(ret);
+            serde_json::from_str(&s)
+        }
+    }
+
+    /// 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`.
+    #[inline]
+    pub fn as_f64(&self) -> Option<f64> {
+        unsafe { FromWasmAbi::from_abi(__wbindgen_number_get(self.idx)) }
+    }
+
+    /// Tests whether this JS value is a JS string.
+    #[inline]
+    pub fn is_string(&self) -> bool {
+        unsafe { __wbindgen_is_string(self.idx) == 1 }
+    }
+
+    /// 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](https://docs.rs/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][caveats] which contains a few
+    /// caveats about the encodings.
+    ///
+    /// [caveats]: https://rustwasm.github.io/docs/wasm-bindgen/reference/types/str.html
+    #[cfg(feature = "std")]
+    #[inline]
+    pub fn as_string(&self) -> Option<String> {
+        unsafe { FromWasmAbi::from_abi(__wbindgen_string_get(self.idx)) }
+    }
+
+    /// 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`.
+    #[inline]
+    pub fn as_bool(&self) -> Option<bool> {
+        unsafe {
+            match __wbindgen_boolean_get(self.idx) {
+                0 => Some(false),
+                1 => Some(true),
+                _ => None,
+            }
+        }
+    }
+
+    /// Tests whether this JS value is `null`
+    #[inline]
+    pub fn is_null(&self) -> bool {
+        unsafe { __wbindgen_is_null(self.idx) == 1 }
+    }
+
+    /// Tests whether this JS value is `undefined`
+    #[inline]
+    pub fn is_undefined(&self) -> bool {
+        unsafe { __wbindgen_is_undefined(self.idx) == 1 }
+    }
+
+    /// Tests whether the type of this JS value is `symbol`
+    #[inline]
+    pub fn is_symbol(&self) -> bool {
+        unsafe { __wbindgen_is_symbol(self.idx) == 1 }
+    }
+
+    /// Tests whether `typeof self == "object" && self !== null`.
+    #[inline]
+    pub fn is_object(&self) -> bool {
+        unsafe { __wbindgen_is_object(self.idx) == 1 }
+    }
+
+    /// Tests whether the type of this JS value is `function`.
+    #[inline]
+    pub fn is_function(&self) -> bool {
+        unsafe { __wbindgen_is_function(self.idx) == 1 }
+    }
+
+    /// Tests whether the type of this JS value is `bigint`.
+    #[inline]
+    pub fn is_bigint(&self) -> bool {
+        unsafe { __wbindgen_is_bigint(self.idx) == 1 }
+    }
+
+    /// Applies the unary `typeof` JS operator on a `JsValue`.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof)
+    #[inline]
+    pub fn js_typeof(&self) -> JsValue {
+        unsafe { JsValue::_new(__wbindgen_typeof(self.idx)) }
+    }
+
+    /// Applies the binary `in` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in)
+    #[inline]
+    pub fn js_in(&self, obj: &JsValue) -> bool {
+        unsafe { __wbindgen_in(self.idx, obj.idx) == 1 }
+    }
+
+    /// Tests whether the value is ["truthy"].
+    ///
+    /// ["truthy"]: https://developer.mozilla.org/en-US/docs/Glossary/Truthy
+    #[inline]
+    pub fn is_truthy(&self) -> bool {
+        !self.is_falsy()
+    }
+
+    /// Tests whether the value is ["falsy"].
+    ///
+    /// ["falsy"]: https://developer.mozilla.org/en-US/docs/Glossary/Falsy
+    #[inline]
+    pub fn is_falsy(&self) -> bool {
+        unsafe { __wbindgen_is_falsy(self.idx) == 1 }
+    }
+
+    /// Get a string representation of the JavaScript object for debugging.
+    #[cfg(feature = "std")]
+    fn as_debug_string(&self) -> String {
+        unsafe {
+            let mut ret = [0; 2];
+            __wbindgen_debug_string(&mut ret, self.idx);
+            let data = Vec::from_raw_parts(ret[0] as *mut u8, ret[1], ret[1]);
+            String::from_utf8_unchecked(data)
+        }
+    }
+
+    /// Compare two `JsValue`s for equality, using the `==` operator in JS.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality)
+    #[inline]
+    pub fn loose_eq(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_jsval_loose_eq(self.idx, other.idx) != 0 }
+    }
+
+    /// Applies the unary `~` JS operator on a `JsValue`.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT)
+    #[inline]
+    pub fn bit_not(&self) -> JsValue {
+        unsafe { JsValue::_new(__wbindgen_bit_not(self.idx)) }
+    }
+
+    /// Applies the binary `>>>` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift)
+    #[inline]
+    pub fn unsigned_shr(&self, rhs: &Self) -> u32 {
+        unsafe { __wbindgen_unsigned_shr(self.idx, rhs.idx) }
+    }
+
+    /// Applies the binary `/` JS operator on two `JsValue`s, catching and returning any `RangeError` thrown.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Division)
+    #[inline]
+    pub fn checked_div(&self, rhs: &Self) -> Self {
+        unsafe { JsValue::_new(__wbindgen_checked_div(self.idx, rhs.idx)) }
+    }
+
+    /// Applies the binary `**` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Exponentiation)
+    #[inline]
+    pub fn pow(&self, rhs: &Self) -> Self {
+        unsafe { JsValue::_new(__wbindgen_pow(self.idx, rhs.idx)) }
+    }
+
+    /// Applies the binary `<` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Less_than)
+    #[inline]
+    pub fn lt(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_lt(self.idx, other.idx) == 1 }
+    }
+
+    /// Applies the binary `<=` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal)
+    #[inline]
+    pub fn le(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_le(self.idx, other.idx) == 1 }
+    }
+
+    /// Applies the binary `>=` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Greater_than_or_equal)
+    #[inline]
+    pub fn ge(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_ge(self.idx, other.idx) == 1 }
+    }
+
+    /// Applies the binary `>` JS operator on the two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Greater_than)
+    #[inline]
+    pub fn gt(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_gt(self.idx, other.idx) == 1 }
+    }
+
+    /// Applies the unary `+` JS operator on a `JsValue`. Can throw.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus)
+    #[inline]
+    pub fn unchecked_into_f64(&self) -> f64 {
+        unsafe { __wbindgen_as_number(self.idx) }
+    }
+}
+
+impl PartialEq for JsValue {
+    /// Compares two `JsValue`s for equality, using the `===` operator in JS.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality)
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        unsafe { __wbindgen_jsval_eq(self.idx, other.idx) != 0 }
+    }
+}
+
+impl PartialEq<bool> for JsValue {
+    #[inline]
+    fn eq(&self, other: &bool) -> bool {
+        self.as_bool() == Some(*other)
+    }
+}
+
+impl PartialEq<str> for JsValue {
+    #[inline]
+    fn eq(&self, other: &str) -> bool {
+        *self == JsValue::from_str(other)
+    }
+}
+
+impl<'a> PartialEq<&'a str> for JsValue {
+    #[inline]
+    fn eq(&self, other: &&'a str) -> bool {
+        <JsValue as PartialEq<str>>::eq(self, other)
+    }
+}
+
+if_std! {
+    impl PartialEq<String> for JsValue {
+        #[inline]
+        fn eq(&self, other: &String) -> bool {
+            <JsValue as PartialEq<str>>::eq(self, other)
+        }
+    }
+    impl<'a> PartialEq<&'a String> for JsValue {
+        #[inline]
+        fn eq(&self, other: &&'a String) -> bool {
+            <JsValue as PartialEq<str>>::eq(self, other)
+        }
+    }
+}
+
+macro_rules! forward_deref_unop {
+    (impl $imp:ident, $method:ident for $t:ty) => {
+        impl $imp for $t {
+            type Output = <&'static $t as $imp>::Output;
+
+            #[inline]
+            fn $method(self) -> <&'static $t as $imp>::Output {
+                $imp::$method(&self)
+            }
+        }
+    };
+}
+
+macro_rules! forward_deref_binop {
+    (impl $imp:ident, $method:ident for $t:ty) => {
+        impl<'a> $imp<$t> for &'a $t {
+            type Output = <&'static $t as $imp<&'static $t>>::Output;
+
+            #[inline]
+            fn $method(self, other: $t) -> <&'static $t as $imp<&'static $t>>::Output {
+                $imp::$method(self, &other)
+            }
+        }
+
+        impl $imp<&$t> for $t {
+            type Output = <&'static $t as $imp<&'static $t>>::Output;
+
+            #[inline]
+            fn $method(self, other: &$t) -> <&'static $t as $imp<&'static $t>>::Output {
+                $imp::$method(&self, other)
+            }
+        }
+
+        impl $imp<$t> for $t {
+            type Output = <&'static $t as $imp<&'static $t>>::Output;
+
+            #[inline]
+            fn $method(self, other: $t) -> <&'static $t as $imp<&'static $t>>::Output {
+                $imp::$method(&self, &other)
+            }
+        }
+    };
+}
+
+impl Not for &JsValue {
+    type Output = bool;
+
+    /// Applies the `!` JS operator on a `JsValue`.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_NOT)
+    #[inline]
+    fn not(self) -> Self::Output {
+        JsValue::is_falsy(self)
+    }
+}
+
+forward_deref_unop!(impl Not, not for JsValue);
+
+impl TryFrom<JsValue> for f64 {
+    type Error = JsValue;
+
+    /// Applies the unary `+` JS operator on a `JsValue`.
+    /// Returns the numeric result on success, or the JS error value on error.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus)
+    #[inline]
+    fn try_from(val: JsValue) -> Result<Self, Self::Error> {
+        f64::try_from(&val)
+    }
+}
+
+impl TryFrom<&JsValue> for f64 {
+    type Error = JsValue;
+
+    /// Applies the unary `+` JS operator on a `JsValue`.
+    /// Returns the numeric result on success, or the JS error value on error.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus)
+    #[inline]
+    fn try_from(val: &JsValue) -> Result<Self, Self::Error> {
+        let jsval = unsafe { JsValue::_new(__wbindgen_try_into_number(val.idx)) };
+        return match jsval.as_f64() {
+            Some(num) => Ok(num),
+            None => Err(jsval),
+        };
+    }
+}
+
+impl Neg for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the unary `-` JS operator on a `JsValue`.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_negation)
+    #[inline]
+    fn neg(self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_neg(self.idx)) }
+    }
+}
+
+forward_deref_unop!(impl Neg, neg for JsValue);
+
+impl BitAnd for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `&` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_AND)
+    #[inline]
+    fn bitand(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_bit_and(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl BitAnd, bitand for JsValue);
+
+impl BitOr for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `|` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_OR)
+    #[inline]
+    fn bitor(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_bit_or(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl BitOr, bitor for JsValue);
+
+impl BitXor for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `^` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_XOR)
+    #[inline]
+    fn bitxor(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_bit_xor(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl BitXor, bitxor for JsValue);
+
+impl Shl for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `<<` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Left_shift)
+    #[inline]
+    fn shl(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_shl(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Shl, shl for JsValue);
+
+impl Shr for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `>>` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Right_shift)
+    #[inline]
+    fn shr(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_shr(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Shr, shr for JsValue);
+
+impl Add for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `+` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Addition)
+    #[inline]
+    fn add(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_add(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Add, add for JsValue);
+
+impl Sub for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `-` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction)
+    #[inline]
+    fn sub(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_sub(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Sub, sub for JsValue);
+
+impl Div for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `/` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Division)
+    #[inline]
+    fn div(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_div(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Div, div for JsValue);
+
+impl Mul for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `*` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Multiplication)
+    #[inline]
+    fn mul(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_mul(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Mul, mul for JsValue);
+
+impl Rem for &JsValue {
+    type Output = JsValue;
+
+    /// Applies the binary `%` JS operator on two `JsValue`s.
+    ///
+    /// [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Remainder)
+    #[inline]
+    fn rem(self, rhs: Self) -> Self::Output {
+        unsafe { JsValue::_new(__wbindgen_rem(self.idx, rhs.idx)) }
+    }
+}
+
+forward_deref_binop!(impl Rem, rem for JsValue);
+
+impl<'a> From<&'a str> for JsValue {
+    #[inline]
+    fn from(s: &'a str) -> JsValue {
+        JsValue::from_str(s)
+    }
+}
+
+if_std! {
+    impl<'a> From<&'a String> for JsValue {
+        #[inline]
+        fn from(s: &'a String) -> JsValue {
+            JsValue::from_str(s)
+        }
+    }
+
+    impl From<String> for JsValue {
+        #[inline]
+        fn from(s: String) -> JsValue {
+            JsValue::from_str(&s)
+        }
+    }
+}
+
+impl From<bool> for JsValue {
+    #[inline]
+    fn from(s: bool) -> JsValue {
+        JsValue::from_bool(s)
+    }
+}
+
+impl<'a, T> From<&'a T> for JsValue
+where
+    T: JsCast,
+{
+    #[inline]
+    fn from(s: &'a T) -> JsValue {
+        s.as_ref().clone()
+    }
+}
+
+impl<T> From<Option<T>> for JsValue
+where
+    JsValue: From<T>,
+{
+    #[inline]
+    fn from(s: Option<T>) -> JsValue {
+        match s {
+            Some(s) => s.into(),
+            None => JsValue::undefined(),
+        }
+    }
+}
+
+impl JsCast for JsValue {
+    // everything is a `JsValue`!
+    #[inline]
+    fn instanceof(_val: &JsValue) -> bool {
+        true
+    }
+    #[inline]
+    fn unchecked_from_js(val: JsValue) -> Self {
+        val
+    }
+    #[inline]
+    fn unchecked_from_js_ref(val: &JsValue) -> &Self {
+        val
+    }
+}
+
+impl AsRef<JsValue> for JsValue {
+    #[inline]
+    fn as_ref(&self) -> &JsValue {
+        self
+    }
+}
+
+macro_rules! numbers {
+    ($($n:ident)*) => ($(
+        impl PartialEq<$n> for JsValue {
+            #[inline]
+            fn eq(&self, other: &$n) -> bool {
+                self.as_f64() == Some(f64::from(*other))
+            }
+        }
+
+        impl From<$n> for JsValue {
+            #[inline]
+            fn from(n: $n) -> JsValue {
+                JsValue::from_f64(n.into())
+            }
+        }
+    )*)
+}
+
+numbers! { i8 u8 i16 u16 i32 u32 f32 f64 }
+
+macro_rules! big_numbers {
+    (|$arg:ident|, $($n:ident = $handle:expr,)*) => ($(
+        impl PartialEq<$n> for JsValue {
+            #[inline]
+            fn eq(&self, other: &$n) -> bool {
+                self == &JsValue::from(*other)
+            }
+        }
+
+        impl From<$n> for JsValue {
+            #[inline]
+            fn from($arg: $n) -> JsValue {
+                unsafe { JsValue::_new($handle) }
+            }
+        }
+    )*)
+}
+
+fn bigint_get_as_i64(v: &JsValue) -> Option<i64> {
+    unsafe { Option::from_abi(__wbindgen_bigint_get_as_i64(v.idx)) }
+}
+
+macro_rules! try_from_for_num64 {
+    ($ty:ty) => {
+        impl TryFrom<JsValue> for $ty {
+            type Error = JsValue;
+
+            #[inline]
+            fn try_from(v: JsValue) -> Result<Self, JsValue> {
+                bigint_get_as_i64(&v)
+                    // Reinterpret bits; ABI-wise this is safe to do and allows us to avoid
+                    // having separate intrinsics per signed/unsigned types.
+                    .map(|as_i64| as_i64 as Self)
+                    // Double-check that we didn't truncate the bigint to 64 bits.
+                    .filter(|as_self| v == *as_self)
+                    // Not a bigint or not in range.
+                    .ok_or(v)
+            }
+        }
+    };
+}
+
+try_from_for_num64!(i64);
+try_from_for_num64!(u64);
+
+macro_rules! try_from_for_num128 {
+    ($ty:ty, $hi_ty:ty) => {
+        impl TryFrom<JsValue> for $ty {
+            type Error = JsValue;
+
+            #[inline]
+            fn try_from(v: JsValue) -> Result<Self, JsValue> {
+                // Truncate the bigint to 64 bits, this will give us the lower part.
+                let lo = match bigint_get_as_i64(&v) {
+                    // The lower part must be interpreted as unsigned in both i128 and u128.
+                    Some(lo) => lo as u64,
+                    // Not a bigint.
+                    None => return Err(v),
+                };
+                // Now we know it's a bigint, so we can safely use `>> 64n` without
+                // worrying about a JS exception on type mismatch.
+                let hi = v >> JsValue::from(64_u64);
+                // The high part is the one we want checked against a 64-bit range.
+                // If it fits, then our original number is in the 128-bit range.
+                let hi = <$hi_ty>::try_from(hi)?;
+                Ok(Self::from(hi) << 64 | Self::from(lo))
+            }
+        }
+    };
+}
+
+try_from_for_num128!(i128, i64);
+try_from_for_num128!(u128, u64);
+
+big_numbers! {
+    |n|,
+    i64 = __wbindgen_bigint_from_i64(n),
+    u64 = __wbindgen_bigint_from_u64(n),
+    i128 = __wbindgen_bigint_from_i128((n >> 64) as i64, n as u64),
+    u128 = __wbindgen_bigint_from_u128((n >> 64) as u64, n as u64),
+}
+
+// `usize` and `isize` have to be treated a bit specially, because we know that
+// they're 32-bit but the compiler conservatively assumes they might be bigger.
+// So, we have to manually forward to the `u32`/`i32` versions.
+impl PartialEq<usize> for JsValue {
+    #[inline]
+    fn eq(&self, other: &usize) -> bool {
+        *self == (*other as u32)
+    }
+}
+
+impl From<usize> for JsValue {
+    #[inline]
+    fn from(n: usize) -> Self {
+        Self::from(n as u32)
+    }
+}
+
+impl PartialEq<isize> for JsValue {
+    #[inline]
+    fn eq(&self, other: &isize) -> bool {
+        *self == (*other as i32)
+    }
+}
+
+impl From<isize> for JsValue {
+    #[inline]
+    fn from(n: isize) -> Self {
+        Self::from(n as i32)
+    }
+}
+
+externs! {
+    #[link(wasm_import_module = "__wbindgen_placeholder__")]
+    extern "C" {
+        fn __wbindgen_object_clone_ref(idx: u32) -> u32;
+        fn __wbindgen_object_drop_ref(idx: u32) -> ();
+
+        fn __wbindgen_string_new(ptr: *const u8, len: usize) -> u32;
+        fn __wbindgen_number_new(f: f64) -> u32;
+        fn __wbindgen_bigint_from_str(ptr: *const u8, len: usize) -> u32;
+        fn __wbindgen_bigint_from_i64(n: i64) -> u32;
+        fn __wbindgen_bigint_from_u64(n: u64) -> u32;
+        fn __wbindgen_bigint_from_i128(hi: i64, lo: u64) -> u32;
+        fn __wbindgen_bigint_from_u128(hi: u64, lo: u64) -> u32;
+        fn __wbindgen_symbol_named_new(ptr: *const u8, len: usize) -> u32;
+        fn __wbindgen_symbol_anonymous_new() -> u32;
+
+        fn __wbindgen_externref_heap_live_count() -> u32;
+
+        fn __wbindgen_is_null(idx: u32) -> u32;
+        fn __wbindgen_is_undefined(idx: u32) -> u32;
+        fn __wbindgen_is_symbol(idx: u32) -> u32;
+        fn __wbindgen_is_object(idx: u32) -> u32;
+        fn __wbindgen_is_function(idx: u32) -> u32;
+        fn __wbindgen_is_string(idx: u32) -> u32;
+        fn __wbindgen_is_bigint(idx: u32) -> u32;
+        fn __wbindgen_typeof(idx: u32) -> u32;
+
+        fn __wbindgen_in(prop: u32, obj: u32) -> u32;
+
+        fn __wbindgen_is_falsy(idx: u32) -> u32;
+        fn __wbindgen_as_number(idx: u32) -> f64;
+        fn __wbindgen_try_into_number(idx: u32) -> u32;
+        fn __wbindgen_neg(idx: u32) -> u32;
+        fn __wbindgen_bit_and(a: u32, b: u32) -> u32;
+        fn __wbindgen_bit_or(a: u32, b: u32) -> u32;
+        fn __wbindgen_bit_xor(a: u32, b: u32) -> u32;
+        fn __wbindgen_bit_not(idx: u32) -> u32;
+        fn __wbindgen_shl(a: u32, b: u32) -> u32;
+        fn __wbindgen_shr(a: u32, b: u32) -> u32;
+        fn __wbindgen_unsigned_shr(a: u32, b: u32) -> u32;
+        fn __wbindgen_add(a: u32, b: u32) -> u32;
+        fn __wbindgen_sub(a: u32, b: u32) -> u32;
+        fn __wbindgen_div(a: u32, b: u32) -> u32;
+        fn __wbindgen_checked_div(a: u32, b: u32) -> u32;
+        fn __wbindgen_mul(a: u32, b: u32) -> u32;
+        fn __wbindgen_rem(a: u32, b: u32) -> u32;
+        fn __wbindgen_pow(a: u32, b: u32) -> u32;
+        fn __wbindgen_lt(a: u32, b: u32) -> u32;
+        fn __wbindgen_le(a: u32, b: u32) -> u32;
+        fn __wbindgen_ge(a: u32, b: u32) -> u32;
+        fn __wbindgen_gt(a: u32, b: u32) -> u32;
+
+        fn __wbindgen_number_get(idx: u32) -> WasmOption<f64>;
+        fn __wbindgen_boolean_get(idx: u32) -> u32;
+        fn __wbindgen_string_get(idx: u32) -> WasmSlice;
+        fn __wbindgen_bigint_get_as_i64(idx: u32) -> WasmOption<i64>;
+
+        fn __wbindgen_debug_string(ret: *mut [usize; 2], idx: u32) -> ();
+
+        fn __wbindgen_throw(a: *const u8, b: usize) -> !;
+        fn __wbindgen_rethrow(a: u32) -> !;
+        fn __wbindgen_error_new(a: *const u8, b: usize) -> u32;
+
+        fn __wbindgen_cb_drop(idx: u32) -> u32;
+
+        fn __wbindgen_describe(v: u32) -> ();
+        fn __wbindgen_describe_closure(a: u32, b: u32, c: u32) -> u32;
+
+        fn __wbindgen_json_parse(ptr: *const u8, len: usize) -> u32;
+        fn __wbindgen_json_serialize(idx: u32) -> WasmSlice;
+        fn __wbindgen_jsval_eq(a: u32, b: u32) -> u32;
+        fn __wbindgen_jsval_loose_eq(a: u32, b: u32) -> u32;
+
+        fn __wbindgen_not(idx: u32) -> u32;
+
+        fn __wbindgen_memory() -> u32;
+        fn __wbindgen_module() -> u32;
+        fn __wbindgen_function_table() -> u32;
+    }
+}
+
+impl Clone for JsValue {
+    #[inline]
+    fn clone(&self) -> JsValue {
+        unsafe {
+            let idx = __wbindgen_object_clone_ref(self.idx);
+            JsValue::_new(idx)
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl fmt::Debug for JsValue {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "JsValue({})", self.as_debug_string())
+    }
+}
+
+#[cfg(not(feature = "std"))]
+impl fmt::Debug for JsValue {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("JsValue")
+    }
+}
+
+impl Drop for JsValue {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            // We definitely should never drop anything in the stack area
+            debug_assert!(self.idx >= JSIDX_OFFSET, "free of stack slot {}", self.idx);
+
+            // Otherwise if we're not dropping one of our reserved values,
+            // actually call the intrinsic. See #1054 for eventually removing
+            // this branch.
+            if self.idx >= JSIDX_RESERVED {
+                __wbindgen_object_drop_ref(self.idx);
+            }
+        }
+    }
+}
+
+impl Default for JsValue {
+    fn default() -> Self {
+        Self::UNDEFINED
+    }
+}
+
+/// Wrapper type for imported statics.
+///
+/// This type is used whenever a `static` is imported from a JS module, for
+/// example this import:
+///
+/// ```ignore
+/// #[wasm_bindgen]
+/// extern "C" {
+///     static console: JsValue;
+/// }
+/// ```
+///
+/// will generate in Rust a value that looks like:
+///
+/// ```ignore
+/// static console: JsStatic<JsValue> = ...;
+/// ```
+///
+/// This type implements `Deref` to the inner type so it's typically used as if
+/// it were `&T`.
+#[cfg(feature = "std")]
+pub struct JsStatic<T: 'static> {
+    #[doc(hidden)]
+    pub __inner: &'static std::thread::LocalKey<T>,
+}
+
+#[cfg(feature = "std")]
+impl<T: FromWasmAbi + 'static> Deref for JsStatic<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        // We know that our tls key is never overwritten after initialization,
+        // so it should be safe (on that axis at least) to hand out a reference
+        // that lives longer than the closure below.
+        //
+        // FIXME: this is not sound if we ever implement thread exit hooks on
+        // wasm, as the pointer will eventually be invalidated but you can get
+        // `&'static T` from this interface. We... probably need to deprecate
+        // and/or remove this interface nowadays.
+        unsafe { self.__inner.with(|ptr| &*(ptr as *const T)) }
+    }
+}
+
+#[cold]
+#[inline(never)]
+#[deprecated(note = "renamed to `throw_str`")]
+#[doc(hidden)]
+pub fn throw(s: &str) -> ! {
+    throw_str(s)
+}
+
+/// Throws a JS exception.
+///
+/// This function will throw a JS exception with the message provided. The
+/// function will not return as the wasm stack will be popped when the exception
+/// is thrown.
+///
+/// Note that it is very easy to leak memory with this function because this
+/// function, unlike `panic!` on other platforms, **will not run destructors**.
+/// It's recommended to return a `Result` where possible to avoid the worry of
+/// leaks.
+#[cold]
+#[inline(never)]
+pub fn throw_str(s: &str) -> ! {
+    unsafe {
+        __wbindgen_throw(s.as_ptr(), s.len());
+    }
+}
+
+/// Rethrow a JS exception
+///
+/// This function will throw a JS exception with the JS value provided. This
+/// function will not return and the wasm stack will be popped until the point
+/// of entry of wasm itself.
+///
+/// Note that it is very easy to leak memory with this function because this
+/// function, unlike `panic!` on other platforms, **will not run destructors**.
+/// It's recommended to return a `Result` where possible to avoid the worry of
+/// leaks.
+#[cold]
+#[inline(never)]
+pub fn throw_val(s: JsValue) -> ! {
+    unsafe {
+        let idx = s.idx;
+        mem::forget(s);
+        __wbindgen_rethrow(idx);
+    }
+}
+
+/// Get the count of live `externref`s / `JsValue`s in `wasm-bindgen`'s heap.
+///
+/// ## Usage
+///
+/// This is intended for debugging and writing tests.
+///
+/// To write a test that asserts against unnecessarily keeping `anref`s /
+/// `JsValue`s alive:
+///
+/// * get an initial live count,
+///
+/// * perform some series of operations or function calls that should clean up
+///   after themselves, and should not keep holding onto `externref`s / `JsValue`s
+///   after completion,
+///
+/// * get the final live count,
+///
+/// * and assert that the initial and final counts are the same.
+///
+/// ## What is Counted
+///
+/// Note that this only counts the *owned* `externref`s / `JsValue`s that end up in
+/// `wasm-bindgen`'s heap. It does not count borrowed `externref`s / `JsValue`s
+/// that are on its stack.
+///
+/// For example, these `JsValue`s are accounted for:
+///
+/// ```ignore
+/// #[wasm_bindgen]
+/// pub fn my_function(this_is_counted: JsValue) {
+///     let also_counted = JsValue::from_str("hi");
+///     assert!(wasm_bindgen::externref_heap_live_count() >= 2);
+/// }
+/// ```
+///
+/// While this borrowed `JsValue` ends up on the stack, not the heap, and
+/// therefore is not accounted for:
+///
+/// ```ignore
+/// #[wasm_bindgen]
+/// pub fn my_other_function(this_is_not_counted: &JsValue) {
+///     // ...
+/// }
+/// ```
+pub fn externref_heap_live_count() -> u32 {
+    unsafe { __wbindgen_externref_heap_live_count() }
+}
+
+#[doc(hidden)]
+pub fn anyref_heap_live_count() -> u32 {
+    externref_heap_live_count()
+}
+
+/// An extension trait for `Option<T>` and `Result<T, E>` for unwrapping the `T`
+/// value, or throwing a JS error if it is not available.
+///
+/// These methods should have a smaller code size footprint than the normal
+/// `Option::unwrap` and `Option::expect` methods, but they are specific to
+/// working with wasm and JS.
+///
+/// On non-wasm32 targets, defaults to the normal unwrap/expect calls.
+///
+/// # Example
+///
+/// ```
+/// use wasm_bindgen::prelude::*;
+///
+/// // If the value is `Option::Some` or `Result::Ok`, then we just get the
+/// // contained `T` value.
+/// let x = Some(42);
+/// assert_eq!(x.unwrap_throw(), 42);
+///
+/// let y: Option<i32> = None;
+///
+/// // This call would throw an error to JS!
+/// //
+/// //     y.unwrap_throw()
+/// //
+/// // And this call would throw an error to JS with a custom error message!
+/// //
+/// //     y.expect_throw("woopsie daisy!")
+/// ```
+pub trait UnwrapThrowExt<T>: Sized {
+    /// Unwrap this `Option` or `Result`, but instead of panicking on failure,
+    /// throw an exception to JavaScript.
+    fn unwrap_throw(self) -> T {
+        self.expect_throw("`unwrap_throw` failed")
+    }
+
+    /// Unwrap this container's `T` value, or throw an error to JS with the
+    /// given message if the `T` value is unavailable (e.g. an `Option<T>` is
+    /// `None`).
+    fn expect_throw(self, message: &str) -> T;
+}
+
+impl<T> UnwrapThrowExt<T> for Option<T> {
+    fn expect_throw(self, message: &str) -> T {
+        if cfg!(all(target_arch = "wasm32", not(target_os = "emscripten"))) {
+            match self {
+                Some(val) => val,
+                None => throw_str(message),
+            }
+        } else {
+            self.expect(message)
+        }
+    }
+}
+
+impl<T, E> UnwrapThrowExt<T> for Result<T, E>
+where
+    E: core::fmt::Debug,
+{
+    fn expect_throw(self, message: &str) -> T {
+        if cfg!(all(target_arch = "wasm32", not(target_os = "emscripten"))) {
+            match self {
+                Ok(val) => val,
+                Err(_) => throw_str(message),
+            }
+        } else {
+            self.expect(message)
+        }
+    }
+}
+
+/// Returns a handle to this wasm instance's `WebAssembly.Module`
+///
+/// Note that this is only available when the final wasm app is built with
+/// `--target no-modules`, it's not recommended to rely on this API yet! This is
+/// largely just an experimental addition to enable threading demos. Using this
+/// may prevent your wasm module from building down the road.
+#[doc(hidden)]
+pub fn module() -> JsValue {
+    unsafe { JsValue::_new(__wbindgen_module()) }
+}
+
+/// Returns a handle to this wasm instance's `WebAssembly.Memory`
+pub fn memory() -> JsValue {
+    unsafe { JsValue::_new(__wbindgen_memory()) }
+}
+
+/// Returns a handle to this wasm instance's `WebAssembly.Table` which is the
+/// indirect function table used by Rust
+pub fn function_table() -> JsValue {
+    unsafe { JsValue::_new(__wbindgen_function_table()) }
+}
+
+#[doc(hidden)]
+pub mod __rt {
+    use crate::JsValue;
+    use core::cell::{Cell, UnsafeCell};
+    use core::ops::{Deref, DerefMut};
+
+    pub extern crate core;
+    #[cfg(feature = "std")]
+    pub extern crate std;
+
+    #[macro_export]
+    #[doc(hidden)]
+    #[cfg(feature = "std")]
+    macro_rules! __wbindgen_if_not_std {
+        ($($i:item)*) => {};
+    }
+
+    #[macro_export]
+    #[doc(hidden)]
+    #[cfg(not(feature = "std"))]
+    macro_rules! __wbindgen_if_not_std {
+        ($($i:item)*) => ($($i)*)
+    }
+
+    #[inline]
+    pub fn assert_not_null<T>(s: *mut T) {
+        if s.is_null() {
+            throw_null();
+        }
+    }
+
+    #[cold]
+    #[inline(never)]
+    fn throw_null() -> ! {
+        super::throw_str("null pointer passed to rust");
+    }
+
+    /// A vendored version of `RefCell` from the standard library.
+    ///
+    /// Now why, you may ask, would we do that? Surely `RefCell` in libstd is
+    /// quite good. And you're right, it is indeed quite good! Functionally
+    /// nothing more is needed from `RefCell` in the standard library but for
+    /// now this crate is also sort of optimizing for compiled code size.
+    ///
+    /// One major factor to larger binaries in Rust is when a panic happens.
+    /// Panicking in the standard library involves a fair bit of machinery
+    /// (formatting, panic hooks, synchronization, etc). It's all worthwhile if
+    /// you need it but for something like `WasmRefCell` here we don't actually
+    /// need all that!
+    ///
+    /// This is just a wrapper around all Rust objects passed to JS intended to
+    /// guard accidental reentrancy, so this vendored version is intended solely
+    /// to not panic in libstd. Instead when it "panics" it calls our `throw`
+    /// function in this crate which raises an error in JS.
+    pub struct WasmRefCell<T: ?Sized> {
+        borrow: Cell<usize>,
+        value: UnsafeCell<T>,
+    }
+
+    impl<T: ?Sized> WasmRefCell<T> {
+        pub fn new(value: T) -> WasmRefCell<T>
+        where
+            T: Sized,
+        {
+            WasmRefCell {
+                value: UnsafeCell::new(value),
+                borrow: Cell::new(0),
+            }
+        }
+
+        pub fn get_mut(&mut self) -> &mut T {
+            unsafe { &mut *self.value.get() }
+        }
+
+        pub fn borrow(&self) -> Ref<T> {
+            unsafe {
+                if self.borrow.get() == usize::max_value() {
+                    borrow_fail();
+                }
+                self.borrow.set(self.borrow.get() + 1);
+                Ref {
+                    value: &*self.value.get(),
+                    borrow: &self.borrow,
+                }
+            }
+        }
+
+        pub fn borrow_mut(&self) -> RefMut<T> {
+            unsafe {
+                if self.borrow.get() != 0 {
+                    borrow_fail();
+                }
+                self.borrow.set(usize::max_value());
+                RefMut {
+                    value: &mut *self.value.get(),
+                    borrow: &self.borrow,
+                }
+            }
+        }
+
+        pub fn into_inner(self) -> T
+        where
+            T: Sized,
+        {
+            self.value.into_inner()
+        }
+    }
+
+    pub struct Ref<'b, T: ?Sized + 'b> {
+        value: &'b T,
+        borrow: &'b Cell<usize>,
+    }
+
+    impl<'b, T: ?Sized> Deref for Ref<'b, T> {
+        type Target = T;
+
+        #[inline]
+        fn deref(&self) -> &T {
+            self.value
+        }
+    }
+
+    impl<'b, T: ?Sized> Drop for Ref<'b, T> {
+        fn drop(&mut self) {
+            self.borrow.set(self.borrow.get() - 1);
+        }
+    }
+
+    pub struct RefMut<'b, T: ?Sized + 'b> {
+        value: &'b mut T,
+        borrow: &'b Cell<usize>,
+    }
+
+    impl<'b, T: ?Sized> Deref for RefMut<'b, T> {
+        type Target = T;
+
+        #[inline]
+        fn deref(&self) -> &T {
+            self.value
+        }
+    }
+
+    impl<'b, T: ?Sized> DerefMut for RefMut<'b, T> {
+        #[inline]
+        fn deref_mut(&mut self) -> &mut T {
+            self.value
+        }
+    }
+
+    impl<'b, T: ?Sized> Drop for RefMut<'b, T> {
+        fn drop(&mut self) {
+            self.borrow.set(0);
+        }
+    }
+
+    fn borrow_fail() -> ! {
+        super::throw_str(
+            "recursive use of an object detected which would lead to \
+             unsafe aliasing in rust",
+        );
+    }
+
+    if_std! {
+        use std::alloc::{alloc, dealloc, realloc, Layout};
+        use std::mem;
+
+        #[no_mangle]
+        pub extern "C" fn __wbindgen_malloc(size: usize) -> *mut u8 {
+            let align = mem::align_of::<usize>();
+            if let Ok(layout) = Layout::from_size_align(size, align) {
+                unsafe {
+                    if layout.size() > 0 {
+                        let ptr = alloc(layout);
+                        if !ptr.is_null() {
+                            return ptr
+                        }
+                    } else {
+                        return align as *mut u8
+                    }
+                }
+            }
+
+            malloc_failure();
+        }
+
+        #[no_mangle]
+        pub unsafe extern "C" fn __wbindgen_realloc(ptr: *mut u8, old_size: usize, new_size: usize) -> *mut u8 {
+            let align = mem::align_of::<usize>();
+            debug_assert!(old_size > 0);
+            debug_assert!(new_size > 0);
+            if let Ok(layout) = Layout::from_size_align(old_size, align) {
+                let ptr = realloc(ptr, layout, new_size);
+                if !ptr.is_null() {
+                    return ptr
+                }
+            }
+            malloc_failure();
+        }
+
+        #[cold]
+        fn malloc_failure() -> ! {
+            if cfg!(debug_assertions) {
+                super::throw_str("invalid malloc request")
+            } else {
+                std::process::abort();
+            }
+        }
+
+        #[no_mangle]
+        pub unsafe extern "C" fn __wbindgen_free(ptr: *mut u8, size: usize) {
+            // This happens for zero-length slices, and in that case `ptr` is
+            // likely bogus so don't actually send this to the system allocator
+            if size == 0 {
+                return
+            }
+            let align = mem::align_of::<usize>();
+            let layout = Layout::from_size_align_unchecked(size, align);
+            dealloc(ptr, layout);
+        }
+    }
+
+    /// This is a curious function necessary to get wasm-bindgen working today,
+    /// and it's a bit of an unfortunate hack.
+    ///
+    /// The general problem is that somehow we need the above two symbols to
+    /// exist in the final output binary (__wbindgen_malloc and
+    /// __wbindgen_free). These symbols may be called by JS for various
+    /// bindings, so we for sure need to make sure they're exported.
+    ///
+    /// The problem arises, though, when what if no Rust code uses the symbols?
+    /// For all intents and purposes it looks to LLVM and the linker like the
+    /// above two symbols are dead code, so they're completely discarded!
+    ///
+    /// Specifically what happens is this:
+    ///
+    /// * The above two symbols are generated into some object file inside of
+    ///   libwasm_bindgen.rlib
+    /// * The linker, LLD, will not load this object file unless *some* symbol
+    ///   is loaded from the object. In this case, if the Rust code never calls
+    ///   __wbindgen_malloc or __wbindgen_free then the symbols never get linked
+    ///   in.
+    /// * Later when `wasm-bindgen` attempts to use the symbols they don't
+    ///   exist, causing an error.
+    ///
+    /// This function is a weird hack for this problem. We inject a call to this
+    /// function in all generated code. Usage of this function should then
+    /// ensure that the above two intrinsics are translated.
+    ///
+    /// Due to how rustc creates object files this function (and anything inside
+    /// it) will be placed into the same object file as the two intrinsics
+    /// above. That means if this function is called and referenced we'll pull
+    /// in the object file and link the intrinsics.
+    ///
+    /// Ideas for how to improve this are most welcome!
+    pub fn link_mem_intrinsics() {
+        crate::externref::link_intrinsics();
+    }
+
+    static mut GLOBAL_EXNDATA: [u32; 2] = [0; 2];
+
+    #[no_mangle]
+    pub unsafe extern "C" fn __wbindgen_exn_store(idx: u32) {
+        debug_assert_eq!(GLOBAL_EXNDATA[0], 0);
+        GLOBAL_EXNDATA[0] = 1;
+        GLOBAL_EXNDATA[1] = idx;
+    }
+
+    pub fn take_last_exception() -> Result<(), super::JsValue> {
+        unsafe {
+            let ret = if GLOBAL_EXNDATA[0] == 1 {
+                Err(super::JsValue::_new(GLOBAL_EXNDATA[1]))
+            } else {
+                Ok(())
+            };
+            GLOBAL_EXNDATA[0] = 0;
+            GLOBAL_EXNDATA[1] = 0;
+            return ret;
+        }
+    }
+
+    /// An internal helper trait for usage in `#[wasm_bindgen]` on `async`
+    /// functions to convert the return value of the function to
+    /// `Result<JsValue, JsValue>` which is what we'll return to JS (where an
+    /// error is a failed future).
+    pub trait IntoJsResult {
+        fn into_js_result(self) -> Result<JsValue, JsValue>;
+    }
+
+    impl IntoJsResult for () {
+        fn into_js_result(self) -> Result<JsValue, JsValue> {
+            Ok(JsValue::undefined())
+        }
+    }
+
+    impl<T: Into<JsValue>> IntoJsResult for T {
+        fn into_js_result(self) -> Result<JsValue, JsValue> {
+            Ok(self.into())
+        }
+    }
+
+    impl<T: Into<JsValue>, E: Into<JsValue>> IntoJsResult for Result<T, E> {
+        fn into_js_result(self) -> Result<JsValue, JsValue> {
+            match self {
+                Ok(e) => Ok(e.into()),
+                Err(e) => Err(e.into()),
+            }
+        }
+    }
+
+    impl<E: Into<JsValue>> IntoJsResult for Result<(), E> {
+        fn into_js_result(self) -> Result<JsValue, JsValue> {
+            match self {
+                Ok(()) => Ok(JsValue::undefined()),
+                Err(e) => Err(e.into()),
+            }
+        }
+    }
+
+    /// An internal helper trait for usage in `#[wasm_bindgen(start)]`
+    /// functions to throw the error (if it is `Err`).
+    pub trait Start {
+        fn start(self);
+    }
+
+    impl Start for () {
+        #[inline]
+        fn start(self) {}
+    }
+
+    impl<E: Into<JsValue>> Start for Result<(), E> {
+        #[inline]
+        fn start(self) {
+            if let Err(e) = self {
+                crate::throw_val(e.into());
+            }
+        }
+    }
+}
+
+/// A wrapper type around slices and vectors for binding the `Uint8ClampedArray`
+/// array in JS.
+///
+/// If you need to invoke a JS API which must take `Uint8ClampedArray` array,
+/// then you can define it as taking one of these types:
+///
+/// * `Clamped<&[u8]>`
+/// * `Clamped<&mut [u8]>`
+/// * `Clamped<Vec<u8>>`
+///
+/// All of these types will show up as `Uint8ClampedArray` in JS and will have
+/// different forms of ownership in Rust.
+#[derive(Copy, Clone, PartialEq, Debug, Eq)]
+pub struct Clamped<T>(pub T);
+
+impl<T> Deref for Clamped<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<T> DerefMut for Clamped<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.0
+    }
+}
+
+/// Convenience type for use on exported `fn() -> Result<T, JsError>` functions, where you wish to
+/// throw a JavaScript `Error` object.
+///
+/// You can get wasm_bindgen to throw basic errors by simply returning
+/// `Err(JsError::new("message"))` from such a function.
+///
+/// For more complex error handling, `JsError` implements `From<T> where T: std::error::Error` by
+/// converting it to a string, so you can use it with `?`. Many Rust error types already do this,
+/// and you can use [`thiserror`](https://crates.io/crates/thiserror) to derive Display
+/// implementations easily or use any number of boxed error types that implement it already.
+///
+///
+/// To allow JavaScript code to catch only your errors, you may wish to add a subclass of `Error`
+/// in a JS module, and then implement `Into<JsValue>` directly on a type and instantiate that
+/// subclass. In that case, you would not need `JsError` at all.
+///
+/// ### Basic example
+///
+/// ```rust,no_run
+/// use wasm_bindgen::prelude::*;
+///
+/// #[wasm_bindgen]
+/// pub fn throwing_function() -> Result<(), JsError> {
+///     Err(JsError::new("message"))
+/// }
+/// ```
+///
+/// ### Complex Example
+///
+/// ```rust,no_run
+/// use wasm_bindgen::prelude::*;
+///
+/// #[derive(Debug, Clone)]
+/// enum MyErrorType {
+///     SomeError,
+/// }
+///
+/// use core::fmt;
+/// impl std::error::Error for MyErrorType {}
+/// impl fmt::Display for MyErrorType {
+///     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+///         write!(f, "display implementation becomes the error message")
+///     }
+/// }
+///
+/// fn internal_api() -> Result<(), MyErrorType> {
+///     Err(MyErrorType::SomeError)
+/// }
+///
+/// #[wasm_bindgen]
+/// pub fn throwing_function() -> Result<(), JsError> {
+///     internal_api()?;
+///     Ok(())
+/// }
+///
+/// ```
+#[derive(Clone)]
+pub struct JsError {
+    value: JsValue,
+}
+
+impl JsError {
+    /// Construct a JavaScript `Error` object with a string message
+    #[inline]
+    pub fn new(s: &str) -> JsError {
+        Self {
+            value: unsafe { JsValue::_new(crate::__wbindgen_error_new(s.as_ptr(), s.len())) },
+        }
+    }
+}
+
+if_std! {
+    impl<E> From<E> for JsError
+    where
+        E: std::error::Error,
+    {
+        fn from(error: E) -> Self {
+            JsError::new(&error.to_string())
+        }
+    }
+}
+
+impl From<JsError> for JsValue {
+    fn from(error: JsError) -> Self {
+        error.value
+    }
+}