question-mark
Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

tslib_1 is not defined when using typescript

See original GitHub issue

Hi The following row is raising the error bellow when using typescript:

const main = await this.page.$x(xpath);
(node:18116) UnhandledPromiseRejectionWarning: Error: Evaluation failed: ReferenceError: tslib_1 is not defined
    at __puppeteer_evaluation_script__:1:16
    at ExecutionContext._evaluateInternal (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\ExecutionCo
ntext.js:122:13)
    at process._tickCallback (internal/process/next_tick.js:68:7)
  -- ASYNC --
    at ExecutionContext.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\helper.js:111:15)
    at DOMWorld.evaluate (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\DOMWorld.js:112:20)
    at process._tickCallback (internal/process/next_tick.js:68:7)
  -- ASYNC --
    at Frame.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\helper.js:111:15)
    at Page.evaluate (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\Page.js:863:43)
    at Page.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\helper.js:112:23)
    at TwitterService.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:207:24)
    at Generator.next (<anonymous>)
    at C:\work\projects\lob\eyez-server-net\node-server\node_modules\tslib\tslib.js:110:75
    at new Promise (<anonymous>)
    at Object.__awaiter (C:\work\projects\lob\eyez-server-net\node-server\node_modules\tslib\tslib.js:106:16)
    at TwitterService.scrollDown (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:206:24)
    at TwitterService.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:111:24)
  -- ASYNC --
    at Page.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\node_modules\puppeteer\lib\helper.js:111:15)
    at TwitterService.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:207:24)
    at Generator.next (<anonymous>)
    at C:\work\projects\lob\eyez-server-net\node-server\node_modules\tslib\tslib.js:110:75
    at new Promise (<anonymous>)
    at Object.__awaiter (C:\work\projects\lob\eyez-server-net\node-server\node_modules\tslib\tslib.js:106:16)
    at TwitterService.scrollDown (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:206:24)
    at TwitterService.<anonymous> (C:\work\projects\lob\eyez-server-net\node-server\dist\twitter\service.js:111:24)
    at Generator.next (<anonymous>)
    at fulfilled (C:\work\projects\lob\eyez-server-net\node-server\node_modules\tslib\tslib.js:107:62)
(node:18116) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an 
async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)

This is the package.json:

"dependencies": {
    "@types/puppeteer": "^2.0.0",
    "compression": "^1.7.4",
    "express": "^4.17.1",
    "helmet": "^3.21.2",
    "puppeteer": "^2.0.0",
    "tslib": "^1.10.0"
  },
  "devDependencies": {
    "@types/compression": "^1.0.1",
    "@types/express": "^4.17.2",
    "@types/helmet": "0.0.45",
    "@types/jest": "^24.0.21",
    "@types/node": "^12.12.5",
    "eslint": "^6.6.0",
    "jest": "^24.9.0",
    "typescript": "^3.6.4"
  }

Thanks

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:5 (1 by maintainers)

github_iconTop GitHub Comments

5reactions
klaascuveliercommented, Mar 25, 2021

I ran into this as well. I was not able to work around it by setting my target to esnext so the native await is being used instead of the tslib1.__awaiter

0reactions
stale[bot]commented, Jul 24, 2022

We are closing this issue. If the issue still persists in the latest version of Puppeteer, please reopen the issue and update the description. We will try our best to accomodate it!

Read more comments on GitHub >

github_iconTop Results From Across the Web

tslib_1 is not defined #18039 - microsoft/TypeScript - GitHub
I have install tslib and set "importHelpers": true to tsconfig.json file. Am I missing something? The Error. Exception has occurred: Error Error: Error: ......
Read more >
Error: "Evaluation failed: ReferenceError: tslib_1 is not defined ...
I have written a puppeteer test case where I am trying to read card title as soon as it matches with specific id...
Read more >
@rollup/plugin-typescript - npm
Start using @rollup/plugin-typescript in your project by running `npm i @rollup/plugin-typescript`. There are no other projects in the npm ...
Read more >
Documentation - Integrating with Build Tools - TypeScript
ts files out-of-the-box. It only performs transpilation and not type checking. It also requires that some compilerOptions have certain values. See the Vite...
Read more >
How to Setup a TypeScript + Node.js Project | Khalil Stemmler
json is where we define the TypeScript compiler options. We can create a tsconfig with several options set. npx tsc --init --rootDir src...
Read more >

github_iconTop Related Medium Post

No results found

github_iconTop Related StackOverflow Question

No results found

github_iconTroubleshoot Live Code

Lightrun enables developers to add logs, metrics and snapshots to live code - no restarts or redeploys required.
Start Free

github_iconTop Related Reddit Thread

No results found

github_iconTop Related Hackernoon Post

No results found

github_iconTop Related Tweet

No results found

github_iconTop Related Dev.to Post

No results found

github_iconTop Related Hashnode Post

No results found