@brighte/redux-saga-test-plan/src/utils/deprecate.js

Test Redux Saga with an easy plan

// @flow
import { warn } from '../utils/logging';

export default function deprecate(fn: Function, message: string): Function {
  let printed = false;

  return (...args) => {
    if (!printed) {
      warn(message);
      printed = true;
    }

    return fn(...args);
  };
}