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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.use std::sync::Once;
pub fn js_exec<'s>(  scope: &mut v8::HandleScope<'s>,  src: &str,) -> v8::Local<'s, v8::Value> {  let code = v8::String::new(scope, src).unwrap();  let script = v8::Script::compile(scope, code, None).unwrap();  script.run(scope).unwrap()}
pub fn v8_init() {  let platform = v8::new_default_platform(0, false).make_shared();  v8::V8::initialize_platform(platform);  v8::V8::initialize();}
pub fn v8_shutdown() {  // SAFETY: this is safe, because all isolates have been shut down already.  unsafe {    v8::V8::dispose();  }  v8::V8::dispose_platform();}
pub fn v8_do(f: impl FnOnce()) {  static V8_INIT: Once = Once::new();  V8_INIT.call_once(|| {    v8_init();  });  f();  // v8_shutdown();}