babel/scripts/eslint_rules/no-undefined-identifier.js

"use strict";

function argumentsIsUndefinedString(argumentsArray) {
  return (
    argumentsArray.length === 1 &&
    argumentsArray[0].type === "Literal" &&
    argumentsArray[0].value === "undefined"
  );
}

module.exports = {
  meta: {
    schema: [],
  },
  create: function(context) {
    if (context.getFilename().indexOf("packages/babel-plugin-") === -1) {
      return {};
    }

    return {
      CallExpression: function(node) {
        const callee = node.callee;

        if (
          callee.type === "MemberExpression" &&
          argumentsIsUndefinedString(node.arguments)
        ) {
          const object = callee.object,
            property = callee.property;

          if (
            object.type === "Identifier" &&
            object.name === "t" &&
            property.type === "Identifier" &&
            property.name === "identifier"
          ) {
            context.report(
              node,
              "Use path.scope.buildUndefinedNode() to create an undefined identifier directly."
            );
          }
        }
      },
    };
  },
};