1  use cfg_if::cfg_if;
 2  use log::Level;
 3  
 4  cfg_if! {
 5      // When the `console_error_panic_hook` feature is enabled, we can call the
 6      // `set_panic_hook` function at least once during initialization, and then
 7      // we will get better error messages if our code ever panics.
 8      //
 9      // For more details see
10      // https://github.com/rustwasm/console_error_panic_hook#readme
11      if #[cfg(feature = "console_error_panic_hook")] {
12          extern crate console_error_panic_hook;
13          pub use self::console_error_panic_hook::set_once as set_panic_hook;
14      } else {
15          #[inline]
16          pub fn set_panic_hook() {}
17      }
18  }
19  
20  cfg_if! {
21      // When the `console_log` feature is enabled, forward log calls to the
22      // JS console.
23      if #[cfg(feature = "console_log")] {
24          pub fn init_log(level: Level) {
25              // Best effort, ignore error if initialization fails.
26              // (This could be the case if the logger is initialized multiple
27              // times.)
28              let _ = console_log::init_with_level(level);
29          }
30      } else {
31          pub fn init_log(_level: Level) {}
32      }
33  }