Take you step by step to analyze the ts code in the vue file
We know that vue files are composed of three types of codes: 'template', 'script', and 'style'. If you want to analyze the ts code in the <script lang="ts"></script> tag, what should you do?
1. The first step: Parse
this parser ##The following test code is an example: <template>
<div>
{{ testRef }}
</div>
</template>
<script setup>
import { ref } from 'vue'
const testRef = ref('test')
</script>
<style scoped>
.test-page {
background-color: #fff;
}
</style>Put the above code into AST explorer, parser select @vue/compiler-dom [Related recommendations: vuejs video tutorial、web front-end development】
const vueCompiler = require('@vue/compiler-dom')
const analyseCode = `<template>
<div>
{{ testRef }}
</div>
</template>
<script setup>
import { ref } from 'vue'
const testRef = ref('test')
</script>
<style scoped>
.test-page {
background-color: #fff;
}
</style>`
const parseVue = (vueCode) => {
// 解析vue代码
const result = vueCompiler.parse(vueCode)
const children = result.children
// 获取script片段
let tsCode = ''
children.forEach(element => {
if (element.tag == 'script') {
tsCode = element.children[0].content;
}
})
console.log(tsCode)
}
parseVue(analyseCode) Running results: 
typescriptAnalysis
@vue/compiler-dom; next, extract The code string is handed over to typescript for processing and the corresponding AST is generated. Take the above code as an example:
const vueCompiler = require('@vue/compiler-dom')
const tsCompiler = require('typescript')
const analyseCode = `<template>
<div>
{{ testRef }}
</div>
</template>
<script setup>
import { ref } from 'vue'
const testRef = ref('test')
</script>
<style scoped>
.test-page {
background-color: #fff;
}
</style>`
const parseVue = (vueCode) => {
// 解析vue代码
const result = vueCompiler.parse(vueCode)
const children = result.children
// 获取script片段
let tsCode = ''
children.forEach(element => {
if (element.tag == 'script') {
tsCode = element.children[0].content;
}
})
console.log(tsCode)
// 将ts代码转化为AST
// 第一个参数为命名，可以随意填，
// 第二个参数是需要生成AST的源代码字符串
// 第三个参数表示TS编译器版本
// 第四个参数表示是否添加parent节点信息
const ast = tsCompiler.createSourceFile('testCode', tsCode, tsCompiler.ScriptTarget.Latest, true)
console.log(ast)
return ast
}
parseVue(analyseCode)Running results (the picture is not complete)
Complete
Through TypeScript’s CompilerAPI:
forEachChildTraverse AST nodes<pre class='brush:php;toolbar:false;'>const ast = parseVue(analyseCode) // 上面示例的函数
const walk = (node) => { // AST遍历函数
tsCompiler.forEachChild(node, walk); // 遍历AST节点
console.log(node); // 输出节点信息
}
walk(ast)</pre>Then according to the common </p>literals, identifiers, expressions, statements, module syntax, class syntax and other statements in the code<p>each has a corresponding AST node Type, you can do the corresponding analysis (detailed knowledge of this piece can be searched online, and can be combined with the visualization tool <code> AST explorer to observe) (Learning video sharing:
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