Object is of type 'unknown' typescript generics

Question

I have a simple function that takes a function as it's argument and returns a new function. I get Object is of type 'unknown' when calling the returned function

const makeFunction = <T>(callback: (someParam: number, options: T) => any) => {    return (options: T) => {     const param = 4;      return callback(param, options)     }   } 

Above code is okay for typescript but when I am calling function I get complaint

makeFunction((param, options) => {   const a = options.optionsValue //(parameter) options: unknown,  Object is of type 'unknown' })({optionsValue: 'some value'}) 

Answer 1

Since this is the first result you get when you google Object is of type 'unknown', I want to post my case. It might help future readers. This is not the answer to OP's question.

I got this error in the catch block. After debugging for a while I came to know that starting typescript v4.0, catch clause variables have type unknown instead of any.

And according to docs:

unknown is safer than any because it reminds us that we need to perform some sort of type-checks before operating on our values.

My code looked something like this before v4.0:

try {   // try something exceptional here } catch (error) {   console.log(error.message); } 

And to fix this error, I had to put an additional if check on error variable.

try {   // try something exceptional here } catch (error) {   let errorMessage = "Failed to do something exceptional";   if (error instanceof Error) {     errorMessage = error.message;   }   console.log(errorMessage); } 

Answer 2

updating my tsconfig.json with the following has worked for me:

"useUnknownInCatchVariables": false,

Update:

you need to put it like this under compilerOptions

"compilerOptions": {     "useUnknownInCatchVariables": false   }