ES7中await如何优雅的捕获异常详解

try {
   const res = await getUser(id)   
}catch(err){
    console.log(err)
}

 [ err, user ] = await to(UserModel.findById(1));

npm i await-to-js --save

import to from 'await-to-js';
// 如果是Node环境，应该这样使用
// const to = require('await-to-js').default;

async function asyncFunctionWithThrow() {
  const [err, user] = await to(UserModel.findById(1));
  if (!user) throw new Error('User not found');
}

interface ServerResponse {
  test: number;
}

const p = Promise.resolve({test: 123});

const [err, data] = await to<ServerResponse>(p);
console.log(data.test);

"main": "dist/await-to-js.umd.js",

/**
 * @param { Promise } promise对象
 * @param { Object= } 附加的错误
 * @return { Promise }
 */
export function to<T, U = Error> (
  promise: Promise<T>,
  errorExt?: object
): Promise<[U, undefined] | [null, T]> {
  return promise
    .then<[null, T]>((data: T) => [null, data])
    .catch<[U, undefined]>((err: U) => {
      if (errorExt) {
        const parsedError = Object.assign({}, err, errorExt);
        return [parsedError, undefined];
      }

      return [err, undefined];
    });
}

export default to;