//usage:讲述@babel/type

import {traverse,types} from "@babel/core";
import {parse} from "@babel/parser";
import CodeGenerator from "@babel/generator";
// import * as t from "@babel/types";



const code = "const a = 1";
let ast = parse(code);

traverse(ast, {
        VariableDeclaration(path) {
            const a = types.identifier("a")
            let init = types.binaryExpression(
                "+",
                types.identifier("a"),
                types.numericLiteral(1)
            );
            let declarator = types.variableDeclarator(types.identifier("b"), init);
            let declaration = types.variableDeclaration("const", [declarator]);
            path.insertAfter(declaration);
            path.stop();
        },
    }
);
const output = CodeGenerator.default(ast, {
    retainLines: true,
}).code;
console.log(output);