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pen-loader

v1.0.0

Published

它是一个 webpack loader

Downloads

0

Readme

它是一个 webpack loader

.pen.ts 机制,凭借 pen-loader,webpack 将对 .pen.ts 文件特殊处理:

  1. 如果 .pen.ts 是作为入口文件被系统调用,则替换该文件中所有 import xxx from 'xxxx.pen.js' 语句中的文件路径为 'xxxx.pen.js?exported_var_name_1,exported_var_name_2...'
import {exportedText} from './article_b.pen.ts'

=>

import {exportedText} from './article_b.pen.ts?exportedText'
  1. 如果是非系统调用,而是模块间调用,即 .ts 调用 .pen.ts 时,将不会直接返回整个 .pen.ts,而是返回它的子集:只和 exported_var_name 指定变量的值相关的代码部分,删去无关的代码
// article_b.pen.ts
import a from ''
import others_import from ''

let b = 'b'
export let exportedText = [a, b, 'c']

function others_func(){
    a.push(1)
}
let others_var = '123'

=>

import a from ''
let b = 'b'
let exportedText = [a, b, 'c']
export {exportedText}

引入上述机制的原因是:

JSpen 需要 js 的引用机制,来产生文章间的联系,但同时,若是常规情况,article1.js 引用了 article2.js 中的内容,将导致webpack打包时,将两篇文章的内容一起打包,从网页加载的角度来说这是不可容忍的。

所以 .pen.ts 之间的 import,得到的实际上都是 treeshaking 处理后的程序子集。