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babel 原理 #46

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juzhiyuan opened this issue Jul 9, 2018 · 0 comments

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juzhiyuan commented Jul 9, 2018 •

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分析代码
生成抽象语法树 AST
递归遍历 AST 并进行转译并生产新的 AST
通过 AST 生成成旧语法或兼容性较高的语法

注意：

babel 只是转译新标准引入的语法，比如 ES6 的箭头函数转译成 ES5 的函数
新标准引入的新的原生对象、部分原生对象新增的原型方法、新增的API等（如Proxy、Set等），这些babel是不会转译的，需要用户自行引入polyfill来解决

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