Issue
I'm running tests with jest
in a simple NodeJS app that uses typescript. My test is throwing an error: ReferenceError: structuredClone is not defined
.
I'm not getting any linter errors and the code compiles fine normally.
const variableForValidation = structuredClone(variableForValidationUncloned);
package.json:
"dependencies": {
...
},
"devDependencies": {
"@types/jest": "^29.0.0",
"@types/node": "^18.7.15",
"@typescript-eslint/eslint-plugin": "^5.36.1",
"@typescript-eslint/parser": "^5.36.1",
"eslint": "^8.23.0",
"jest": "^28.0.1",
"nodemon": "^2.0.19",
"serverless-plugin-typescript": "^2.1.2",
"ts-jest": "^28.0.8",
"ts-node": "^10.9.1",
"typescript": "^4.8.2"
}
This github issue suggests to me that the issue has been resolved: https://github.com/facebook/jest/issues/12628 - or perhaps I'm misunderstanding?
I've seen a similar Stack question but using Mocha: mocha not recognizing structuredClone is not defined
Solution
I couldn't figure it out, so I set my own global:
// globals.ts
if(!global.structuredClone){
global.structuredClone = function structuredClone(objectToClone: any) {
const stringified = JSON.stringify(objectToClone);
const parsed = JSON.parse(stringified);
return parsed;
}
}
// entry point of app, eg index.ts:
import './globals.ts'
// ...
I think it might be because the target
in my tsconfig
is converting my typescript files to a javascript/node version before structuredClone was added?
Answered By - JimmyTheCode
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