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    cfg_if::cfg_if! {
        if #[cfg(any(
            all(target_arch = "wasm32", not(target_os = "wasi")),
            target_arch = "asmjs"
        ))] {
            #[cfg(all(feature = "stdweb", not(feature = "wasm-bindgen")))]
            #[macro_use]
            extern crate stdweb;

            mod wasm;
            pub use wasm::Instant;
            #[cfg(feature = "now")]
            pub use crate::wasm::now;
        } else {
            mod native;
            pub use native::Instant;
            #[cfg(feature = "now")]
            pub use native::now;
        }
    }

    pub use std::time::Duration;