rubico/dist/tryCatch.es.js

[a]synchronous functional programming

/**
 * rubico v2.6.2
 * https://github.com/a-synchronous/rubico
 * (c) 2019-2024 Richard Tong
 * rubico may be freely distributed under the MIT license.
 */

const isPromise = value => value != null && typeof value.then == 'function'

const promiseAll = Promise.all.bind(Promise)

const __ = Symbol.for('placeholder')

// argument resolver for curry3
const curry3ResolveArg0 = (
  baseFunc, arg1, arg2,
) => function arg0Resolver(arg0) {
  return baseFunc(arg0, arg1, arg2)
}

// argument resolver for curry3
const curry3ResolveArg1 = (
  baseFunc, arg0, arg2,
) => function arg1Resolver(arg1) {
  return baseFunc(arg0, arg1, arg2)
}

// argument resolver for curry3
const curry3ResolveArg2 = (
  baseFunc, arg0, arg1,
) => function arg2Resolver(arg2) {
  return baseFunc(arg0, arg1, arg2)
}

const curry3 = function (baseFunc, arg0, arg1, arg2) {
  if (arg0 == __) {
    return curry3ResolveArg0(baseFunc, arg1, arg2)
  }
  if (arg1 == __) {
    return curry3ResolveArg1(baseFunc, arg0, arg2)
  }
  return curry3ResolveArg2(baseFunc, arg0, arg1)
}

const catcherApply = function (catcher, err, args) {
  return catcher(err, ...args)
}

const isArray = Array.isArray

const areAnyValuesPromises = function (values) {
  if (isArray(values)) {
    const length = values.length
    let index = -1
    while (++index < length) {
      const value = values[index]
      if (isPromise(value)) {
        return true
      }
    }
    return false
  }

  for (const key in values) {
    const value = values[key]
    if (isPromise(value)) {
      return true
    }
  }
  return false
}

// _tryCatch(tryer function, catcher function, args Array) -> Promise
const _tryCatch = function (tryer, catcher, args) {
  try {
    const result = tryer(...args)
    return isPromise(result)
      ? result.catch(curry3(catcherApply, catcher, __, args))
      : result
  } catch (error) {
    return catcher(error, ...args)
  }
}

const tryCatch = function (...args) {
  if (args.length > 2) {
    const catcher = args.pop(),
      tryer = args.pop()
    if (areAnyValuesPromises(args)) {
      return promiseAll(args)
        .then(curry3(_tryCatch, tryer, catcher, __))
    }
    return _tryCatch(tryer, catcher, args)
  }

  const tryer = args[0],
    catcher = args[1]
  return function tryCatcher(...args) {
    return _tryCatch(tryer, catcher, args)
  }
}

export default tryCatch