styled-components/src/vendor/postcss/warn-once.js

Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress 💅

let printed = { };

export default function warnOnce(message) {
    if ( printed[message] ) return;
    printed[message] = true;

    if ( typeof console !== 'undefined' && console.warn ) console.warn(message);
}