ReferenceError: ReadableStream is not defined at Object. (/Users/anaadmin/Documents/AnaNewApp/node_modules/@expo/cli/node_modules/undici/lib/web/fetch/response.js:528:3) at Module._compile (node:internal/modules/cjs/loader:1198:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10) at Module.load (node:internal/modules/cjs/loader:1076:32) at Function.Module._load (node:internal/modules/cjs/loader:911:12) at Module.require (node:internal/modules/cjs/loader:1100:19) at require (node:internal/modules/cjs/helpers:119:18) at Object. (/Users/anaadmin/Documents/AnaNewApp/node_modules/@expo/cli/node_modules/undici/lib/web/fetch/index.js:11:5) at Module._compile (node:internal/modules/cjs/loader:1198:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10) After trying out all suggestions and different versions of tools such as XCode, nvm, yarn, node, etc., nothing works for me i added : <PROJECT_PATH>/node_modules/@langchain/core/dist/utils/stream.cjs - add const { ReadableStream } = require("web-streams-polyfill"); npm install web-streams-polyfill Tried downgrading to Node 18 as well as various polyfills but haven't been able to get it to work Following does not work in xcode Delete your Podfile.lock (I like to use the command '-rm -rf Podfile.lock' on the terminal for this) Delete your Pods folder (I like to use the command '-rm -rf Pods' in the terminal for this) Delete your .xcworkspace Pod install Clear your project into XCode> Product> Clean Build Folder i have tried cd ios pod install Continuously i am getting same error. Any one know, how to resolve this error