third-party/fb-mysql/8.0.20/extra/duktape/duktape-2.3.0/extras/console/README.rst
Duktape doesn't provide a console binding (for example console.log)
by default because it would be a portability issue for some targets. Instead,
an application should provide its own console binding. This directory
contains an example binding:
Add duk_console.c to list of C sources to compile.
Ensure duk_console.h is in the include path.
Include the extra header in calling code and initialize the bindings::
#include "duktape.h"
#include "duk_console.h"
/* After initializing the Duktape heap or when creating a new
* thread with a new global environment:
*/
duk_console_init(ctx, 0 /*flags*/);
Use the DUK_CONSOLE_PROXY_WRAPPER to enable a Proxy wrapper for the
console object. The wrapper allows all undefined methods (for example,
console.foo) to be handled as no-ops instead of throwing an error.
See duk_console.h for full flags list.
After these steps, console will be registered to the global object
and is ready to use.
By default the console object will use stdout for log levels up to
info, and stderr for warning and above. You can change this by
providing either DUK_CONSOLE_STDOUT_ONLY or DUK_CONSOLE_STDERR_ONLY
in duk_console_init() flags.