Advanced Vue front-end skills require.context

Osc-u tsmpzerj 2020-11-10 14:23:16
advanced vue front-end end skills


demand

In use vue In the process of development , We might use it import The introduction of the file , But it becomes cumbersome to introduce more than one , Now we can use require.context To dynamically import multiple files .

stackoverflow The explanation is very clear :

require.context is a special feature supported by webpack's compiler that allows you to get all matching modules starting from some base directory. The intention is to tell webpack at compile time to transform that expression into a dynamic list of all the possible matching module requests that it can resolve, in turn adding them as build dependencies and allowing you to require them at runtime.

In short, you would use require.context in the exact same situation when in Node.js at runtime you would use globs to dynamically build a list of module paths to require. The return value is a callable object that behaves like require, whose keys contain the necessary module request data that can be passed to it as an argument to require the module.

There are several ways you can use it, but I think the two most common use cases are to either automagically require some well-known kind of modules (e.g. you just add some.test.js test module and in some module you use require.context to dynamically discover all the tests, thus not having to document and remember to do it manually every time you add a new test module) or to load static assets in the repository to emit files to the build output (new webpack users coming from other build tools are usually surprised that their images, fonts, audio files and other assets do not appear in the output unless they are required from some module).

Pay attention to the above mentioned “ Multiple files ” No specific type of file is required , therefore , This tool is very useful . Developing SPA Front end process , The tasks shown in the figure below are often needed , Use a lot of import Inject sub components into a view :
 senior Vue Front end skills require.context

here , Import one by one is laborious and prone to problems , Especially when demand is changing .

require.context programme

require.context grammar

require.context(directory, useSubdirectories, regExp)
【 Parameter meaning 】

  • directory: File path to find
  • useSubdirectories: Whether to find subdirectories
  • regExp: To match the regularity of the file

therefore , You need to use Import The need to load a large number of files ( There may be many similar requirements in the project ), The following scheme can be used to simplify :

import Vue from 'vue'
import upperFirst from 'lodash/upperFirst'
import camelCase from 'lodash/camelCase'
const requireComponent = require.context(
'@/components/base', true, /\.vue$/,
)
requireComponent.keys().forEach(fileName => {
const componentConfig = requireComponent(fileName)
const componentName = upperFirst(
camelCase(fileName.replace(/^\.\//, '').replace(/\.\w+$/, '')),
)
// Certified components , Pass in an extended constructor or object 
Vue.component(`Base${componentName}`, componentConfig.default || componentConfig)
})

The overall function description of the above code is :

  • Use require.context Query and add the qualified result file name to a key - Object in the form of value pairs requireComponent in
  • Adjust the file name format in the object
  • Registered as Vue Child components ( Use Vue.component)

quote

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