error-handled-node-hmr

Module to handle errors when using node-hmr.

API

ehhmr(hmr, watchFile, [callbackImported], [callbackPreImport], [options], [callbackCatch])

• hmr node-hmr module. Required
• watchFile import module name or path. Required
• callbackImported Function called when module is imported
• callbackPreImport Function called before importing a module
• options node-hmr options
  • The watchFilePatterns option is set to [watchFile] by default
• callbackCatch
  • By default, errors are output to the console,
  • but you can output errors to the console yourself by assigning a function to callbackCatch.

Usage

const hmr = require('node-hmr')
const ehhmr = require('error-handled-node-hmr')

var watchFile = './watched.js'

ehhmr(hmr, watchFile, importedModule => {
  console.log('imported')
})

Equivalent to:

const hmr = require('node-hmr')

var watchFile = './watched.js'

hmr(() => {
  try {
    const importedModule = require(watchFile)

    console.log('imported')
  } catch (e) {
    console.error(e)

    const moduleId = require.resolve(watchFile)
    require.cache[moduleId] = { id: moduleId }
  }
}, { watchFilePatterns: [watchFile] })

Customize the handling before importing a module

let watchedModule
ehhmr(hmr, watchFile, importedModule => {
  watchedModule = importedModule
}, () => console.log('pre import'))

Custom node-hmr options

ehhmr(hmr, watchFile, importedModule => {
  console.log('imported')
}, undefined, {
  watchFilePatterns: [
    watchFile,
    './moduleB.js'
  ]
})

Use hmr only in development mode

const dev = process.env.NODE_ENV !== 'production'

let handleModule
const fn = importedModule => {
  handleModule = importedModule
}

if (dev) {
  const hmr = require('node-hmr')
  const ehhmr = require('error-handled-node-hmr')

  var handleFile = './watched.js'

  ehhmr(hmr, handleFile, importedModule => {
    fn(importedModule)
  })
} else
  fn(require(handleFile))