Sorry I'm not familiar with es7. But I still thing my OMP is better than async/await.
1: the await keyword can only be used in an async function, so each time you want to await you have to add async before outer function. 2: async/await still use promise to handle async, which is not as clear as my OMP that only use functions. The reject state of the promise became redundant since await never gets it. 3: the async function calls identically with sync functions, makes it hard to check out if the function is async without jumping to the definition. But OMP can easily be recognized. 4: it's complex for async/await to handle deep async callbacks.
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