first commit

test2.js

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+let parser = require("@babel/parser")
+let _traverse = require("@babel/traverse")
+const traverse = _traverse.default;
+
+let _generator = require("@babel/generator")
+const generator = _generator.default;
+
+const code = `let val = 1 + 2`
+const ast = parser.parse(code)
+// console.log(ast)
+
+traverse(ast, {
+  enter(path) {  // 这个path会找到所有的node
+    if (path.node.type == 'Identifier') {
+      path.node.name = 'modify'
+      path.stop()
+    }
+  }
+})
+
+const ret = generator(ast)
+console.log(ret)