After installing graphql-tools and graphql-express. Error message in console 'Cannot find name 'AsyncIterator'

问题

Error Log On initiating application

While initiating the application it shows the following error and i tried couple of fixes from online which has mentioned below but none of them has worked requesting for suggestions and solutions

node_modules/@types/graphql/subscription/subscribe.d.ts(17,12): error TS2304: Cannot find name 'AsyncIterator'.
node_modules/@types/graphql/subscription/subscribe.d.ts(29,12): error TS2304: Cannot find name 'AsyncIterable'.
node_modules/graphql-tools/dist/stitching/makeRemoteExecutableSchema.d.ts(3,109): error TS2304: Cannot find name 'AsyncIterator'.

Fixes Tried as per google results

Adding esnext.asynciterable to the tsconfig.json
Adding esnext to the tsconfig.json

But none of them has worked. package.json

  "dependencies": {
    "async": "^2.6.0",
    "body-parser": "^1.18.2",
    "cookie-parser": "^1.4.3",
    "cors": "^2.8.4",
    "ejs": "^2.5.7",
    "errorhandler": "^1.5.0",
    "express": "^4.16.2",
    "express-graphql": "^0.6.12",
    "graphql": "^0.13.2",
    "graphql-tools": "^3.1.1",
    "ldapjs": "^1.0.1",
    "method-override": "^2.3.10",
    "moment": "^2.20.1",
    "mongoose": "^4.13.6",
    "morgan": "^1.9.0",
    "mysql": "^2.15.0",
    "node-schedule": "^1.3.0",
    "nodemiral": "^1.1.1",
    "pug": "^2.0.0-rc.4",
    "q": "^1.5.1",
    "request": "^2.85.0",
    "sendmail": "^1.2.0",
    "serve-favicon": "^2.4.5",
    "socket.io": "^2.0.4",
    "ts-node": "^3.3.0"
  },
  "devDependencies": {
    "@types/async": "^2.0.47",
    "@types/body-parser": "^1.16.8",
    "@types/chai": "^4.0.8",
    "@types/chai-http": "^3.0.3",
    "@types/cookie-parser": "^1.4.1",
    "@types/cors": "^2.8.3",
    "@types/errorhandler": "0.0.32",
    "@types/ldapjs": "^1.0.3",
    "@types/lodash": "^4.14.106",
    "@types/method-override": "0.0.31",
    "@types/mocha": "^2.2.44",
    "@types/mongodb": "^2.2.16",
    "@types/mongoose": "^4.7.28",
    "@types/morgan": "^1.7.35",
    "@types/mysql": "^2.15.3",
    "@types/node-schedule": "^1.2.2",
    "@types/request": "^2.47.0",
    "@types/serve-favicon": "^2.2.30",
    "@types/socket.io": "^1.4.32",
    "chai": "^4.1.2",
    "chai-http": "^3.0.0",
    "grunt": "^1.0.1",
    "grunt-concurrent": "^2.3.1",
    "grunt-contrib-copy": "^1.0.0",
    "grunt-contrib-watch": "^1.0.0",
    "grunt-mocha-test": "^0.13.3",
    "grunt-newer": "^1.3.0",
    "grunt-nodemon": "^0.4.2",
    "grunt-ts": "^6.0.0-beta.17",
    "grunt-tslint": "^5.0.1",
    "grunt-typedoc": "^0.2.4",
    "mocha": "^4.0.1",
    "mocha-typescript": "^1.1.12",
    "nodemon": "^1.12.4",
    "tslint": "^5.8.0",
    "typescript": "^2.6.2"
  }

回答1:

Delete node modules then:-

npm install 
npm install --save graphql-subscriptions
npm install --save @types/graphql
npm install --save @types/ws

add the following in tsconfig.json

"compilerOptions": {
  "lib": [
     "esnext.asynciterable"
   ]

回答2:

I encountered the same problem and adding

"lib": ["es2017", "esnext", "esnext.asynciterable"]

to my tsconfig.json did not help, which was frustrating.

I went through lots of suggestions and eventually the answer by Shivendra solved it for me. Hope this will help others coming here in the future.

来源：https://stackoverflow.com/questions/51670523/after-installing-graphql-tools-and-graphql-express-error-message-in-console-ca

标签

node.js

express

graphql

express-graphql

async-iterator