packages/i18n-calypso/src/i18n.js
function warn() {
	if ( ! I18N.throwErrors ) {
		return;
	}
	if ( 'undefined' !== typeof window && window.console && window.console.warn ) {
		window.console.warn.apply( window.console, arguments );
	}
}
function warn() {
	if ( ! I18N.throwErrors ) {
		return;
	}
	if ( 'undefined' !== typeof window && window.console && window.console.warn ) {
		window.console.warn.apply( window.console, arguments );
	}
}
raise a console warning