It is the same question, as correctly answered here jest global variable example , but the concern is Typescript.
console.log(__DEV__);
Results in:
error TS2304: Cannot find name __DEV__.
The global var __DEV__ is defined in package.json as:
"jest": {
"globals": {
"__DEV__": true
}
}
Has anybody a solution or work around?
Relevant jest documentation: https://jestjs.io/docs/en/next/configuration#globals-object
in ts-jest it's necessary to wrap some config values with "ts-jest":
"jest": {
"globals": {
"ts-jest": {
"__DEV__": true
}
}
}
and can access in code with:
console.log((global as any).__DEV__
Found the answer here https://kulshekhar.github.io/ts-jest/docs/
One proper solution is to write a .d.ts which introduces declare of global variable, and let tsconfig.json inclues this .d.ts file.
I agree that proper solution is to create your custom.d.ts file and declare a global variable there.