// WORKING_DIR_ROOT/test/custom_tests/remove.js

const traverse = require("../../packages/babel-traverse/lib").default;
const t = require("../../packages/babel-types/lib");
const generate = require("../../packages/babel-generator/lib");
const { parse } = require("../../packages/babel-parser");


const script = `
{
  let a = 33;
}
let a = 42;
`

const AST = parse(script);

let found = false;
traverse(AST, {
  /**
   * 
   * @param {NodePath<t.VariableDeclarator>} path 
   * @returns 
   */
  VariableDeclarator(path){
          
    if(!found && path.toString() === "a = 33"){
      found = true;
       path.remove();
      return;
    } else if(path.toString() === "a = 42") {
      const binding = path.scope.getBinding("a");  
      // binding is undefined
      console.log(binding);
      // can't access path of undefined
      console.log(binding.path.toString());
    }
    
    
  }
});

function (self: NodePath, parent: NodePath) {
    const removeParent =
      // while (NODE);
      // removing the test of a while/switch, we can either just remove it entirely *or* turn the
      // `test` into `true` unlikely that the latter will ever be what's wanted so we just remove
      // the loop to avoid infinite recursion
      (self.key === "test" && (parent.isWhile() || parent.isSwitchCase())) ||
      // export NODE;
      // just remove a declaration for an export as this is no longer valid
      (self.key === "declaration" && parent.isExportDeclaration()) ||
      // label: NODE
      // stray labeled statement with no body
      (self.key === "body" && parent.isLabeledStatement()) ||
      // let NODE;
      // remove an entire declaration if there are no declarators left
      (self.listKey === "declarations" &&
        parent.isVariableDeclaration() &&
        parent.node.declarations.length === 1) ||
      // NODE;
      // remove the entire expression statement if there's no expression
      (self.key === "expression" && parent.isExpressionStatement());

    if (removeParent) {
      parent.remove();
      return true;
    }
  }