package.json
{
"name": "babel-test",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"devDependencies": {
"@babel/core": "^7.13.10"
}
}
要编译的原代码fun.js
const c = '';
babel 插件 plugin.js
module.exports = function(babel) {
const t = babel.types;
return {
visitor: {
VariableDeclarator(path, state) {
// 使用a替换变量名c
if(path.node.id.name == 'c'){
path.node.id = t.identifier('a')
}
// 使用["any"]替换字符串字面量
if (t.isStringLiteral(path.node.init)) {
const element = t.stringLiteral('any');
path.node.init = t.arrayExpression([element]);
}
}
}
}
}
编译文件index.js
const babel = require('@babel/core');
const pluginFunc = require('./plugin');
const configItem = babel.createConfigItem(pluginFunc);
const ret = babel.transformFileSync('fun.js', { plugins: [configItem], ast: true});
console.log(ret.code);
输出代码
const a = ["any"];
将code转化为AST节点在线查看器 AST explorer
