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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.use std::any::TypeId;use std::mem::transmute_copy;
use crate::ByteString;use crate::U16String;use crate::ZeroCopyBuf;
/// Serializable exists to allow boxing values as "objects" to be serialized later,/// this is particularly useful for async op-responses. This trait is a more efficient/// replacement for erased-serde that makes less allocations, since it's specific to serde_v8/// (and thus doesn't have to have generic outputs, etc...)pub trait Serializable {  fn to_v8<'a>(    &mut self,    scope: &mut v8::HandleScope<'a>,  ) -> Result<v8::Local<'a, v8::Value>, crate::Error>;}
/// Allows all implementors of `serde::Serialize` to implement Serializableimpl<T: serde::Serialize> Serializable for T {  fn to_v8<'a>(    &mut self,    scope: &mut v8::HandleScope<'a>,  ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {    crate::to_v8(scope, self)  }}
/// SerializablePkg exists to provide a fast path for op returns,/// allowing them to avoid boxing primtives (ints/floats/bool/unit/...)pub enum SerializablePkg {  Primitive(Primitive),  Serializable(Box<dyn Serializable>),}
impl SerializablePkg {  pub fn to_v8<'a>(    &mut self,    scope: &mut v8::HandleScope<'a>,  ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {    match self {      Self::Primitive(x) => crate::to_v8(scope, x),      Self::Serializable(x) => x.to_v8(scope),    }  }}
/// Primitive serves as a lightweight serializable wrapper around primitives/// so that we can use them for async valuespub enum Primitive {  Unit,  Bool(bool),  Int8(i8),  Int16(i16),  Int32(i32),  Int64(i64),  UInt8(u8),  UInt16(u16),  UInt32(u32),  UInt64(u64),  Float32(f32),  Float64(f64),  String(String),  ZeroCopyBuf(ZeroCopyBuf),  ByteString(ByteString),  U16String(U16String),}
impl serde::Serialize for Primitive {  fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>  where    S: serde::Serializer,  {    match self {      Self::Unit => ().serialize(s),      Self::Bool(x) => x.serialize(s),      Self::Int8(x) => x.serialize(s),      Self::Int16(x) => x.serialize(s),      Self::Int32(x) => x.serialize(s),      Self::Int64(x) => x.serialize(s),      Self::UInt8(x) => x.serialize(s),      Self::UInt16(x) => x.serialize(s),      Self::UInt32(x) => x.serialize(s),      Self::UInt64(x) => x.serialize(s),      Self::Float32(x) => x.serialize(s),      Self::Float64(x) => x.serialize(s),      Self::String(x) => x.serialize(s),      Self::ZeroCopyBuf(x) => x.serialize(s),      Self::ByteString(x) => x.serialize(s),      Self::U16String(x) => x.serialize(s),    }  }}
impl<T: serde::Serialize + 'static> From<T> for SerializablePkg {  fn from(x: T) -> Self {    #[inline(always)]    fn tc<T, U>(src: T) -> U {      // SAFETY: the caller has ensured via the TypeId that the T and U types      // are the same.      let x = unsafe { transmute_copy(&src) };      std::mem::forget(src);      x    }
    let tid = TypeId::of::<T>();    if tid == TypeId::of::<()>() {      Self::Primitive(Primitive::Unit)    } else if tid == TypeId::of::<bool>() {      Self::Primitive(Primitive::Bool(tc(x)))    } else if tid == TypeId::of::<i8>() {      Self::Primitive(Primitive::Int8(tc(x)))    } else if tid == TypeId::of::<i16>() {      Self::Primitive(Primitive::Int16(tc(x)))    } else if tid == TypeId::of::<i32>() {      Self::Primitive(Primitive::Int32(tc(x)))    } else if tid == TypeId::of::<i64>() {      Self::Primitive(Primitive::Int64(tc(x)))    } else if tid == TypeId::of::<u8>() {      Self::Primitive(Primitive::UInt8(tc(x)))    } else if tid == TypeId::of::<u16>() {      Self::Primitive(Primitive::UInt16(tc(x)))    } else if tid == TypeId::of::<u32>() {      Self::Primitive(Primitive::UInt32(tc(x)))    } else if tid == TypeId::of::<u64>() {      Self::Primitive(Primitive::UInt64(tc(x)))    } else if tid == TypeId::of::<f32>() {      Self::Primitive(Primitive::Float32(tc(x)))    } else if tid == TypeId::of::<f64>() {      Self::Primitive(Primitive::Float64(tc(x)))    } else if tid == TypeId::of::<String>() {      Self::Primitive(Primitive::String(tc(x)))    } else if tid == TypeId::of::<ZeroCopyBuf>() {      Self::Primitive(Primitive::ZeroCopyBuf(tc(x)))    } else if tid == TypeId::of::<ByteString>() {      Self::Primitive(Primitive::ByteString(tc(x)))    } else if tid == TypeId::of::<U16String>() {      Self::Primitive(Primitive::U16String(tc(x)))    } else {      Self::Serializable(Box::new(x))    }  }}