debugtypescriptModerate
Cannot find name 'describe'. Do you need to install type definitions for a test runner?
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runnerdefinitionsyouinstalldescribefindcannottypetestname
Problem
When using TypeScript in conjunction with Jest, my specs would fail with error messages like:
The types are already installed.
I use:
I run tests using
test/unit/some.spec.ts:1:1 - error TS2582: Cannot find name 'describe'. Do you need to install type definitions for a test runner? Try npm i @types/jest or npm i @types/mocha.
test/unit/some.spec.ts:2:3 - error TS2582: Cannot find name 'it'. Do you need to install type definitions for a test runner? Try npm i @types/jest or npm i @types/mocha.
test/unit/some.spec.ts:3:7 - error TS2304: Cannot find name 'expect'.
test/unit/some.spec.ts:7:1 - error TS2582: Cannot find name 'test'. Do you need to install type definitions for a test runner? Try npm i @types/jest or npm i @types/mocha.
The types are already installed.
I use:
"@types/jest": "^23.3.12",
"jest": "^23.6.0",
"ts-jest": "^23.10.5",
"typescript": "^3.1.6"
I run tests using
jest --forceExit --coverage --verboseSolution
After fiddling with the
Failing configuration (before)
Working configuration
tsconfig.json for a while I finally figured that commenting the "types": [], will work.Failing configuration (before)
// tsconfig.json
{
"compilerOptions": {
"types": []
}
}
Working configuration
// tsconfig.json
{
"compilerOptions": {
// "types": []
}
}
Context
Stack Overflow Q#54139158, score: 37
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