# @babel/遍历

# 安装

  • npm
npm install --save @babel/traverse
  • yarn
yarn add @babel/traverse

# 用法

我们可以将它与 babel 解析器一起使用来遍历和更新节点:

JavaScript

import * as parser from "@babel/parser";
import traverse from "@babel/traverse";

const code = `function square(n) {
  return n * n;
}`;

const ast = parser.parse(code);

traverse(ast, {
  enter(path) {
    if (path.isIdentifier({ name: "n" })) {
      path.node.name = "x";
    }
  },
});

此外,我们可以针对语法树中的特定节点类型 (opens new window)

JavaScript

traverse(ast, {
  FunctionDeclaration: function(path) {
    path.node.id.name = "x";
  },
});

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Last Updated: 6/14/2023, 8:56:23 AM