Solving Index Signature in Typescript for dynamic object property names

IndexSignature.ts

/**
 * In this case this function convert an objest to url query params
 */

const object2UrlParameters = (objectValues:object): string => {
  let returnedParams:string = ''
  Object.getOwnPropertyNames(objectValues).forEach((paramName) => {
    let key = paramName as keyof object //Avoiding Index Signature
    let value = objectValues[key]
    returnedParams = `${returnedParams}&${paramName}=${value}`
  })

  return returnedParams.slice(1)
}

//Example
console.log(object2UrlParameters({foo: "baz", number: 2}))