Convert a json object to a comma seperated value (CSV) string

function 
function jsonToCsv(items: Object[]): string
jsonToCsv(
items: Object[]
items: 
interface Object
Provides functionality common to all JavaScript objects.
Object[]): string {
  if (
items: Object[]
items.
Array<Object>.length: number
Gets or sets the length of the array. This is a number one higher than the highest index in the array.
length == 0 || !
items: Object[]
items) return "";
  const 
const header: readonly (keyof Object)[]
header = 
var Object: ObjectConstructor
Provides functionality common to all JavaScript objects.
Object.
ObjectConstructor.keys(o: {}): string[] (+1 overload)
Returns the names of the enumerable string properties and methods of an object.
@param ― o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
keys(
items: Object[]
items[0]) as readonly (keyof (typeof 
items: Object[]
items)[number])[];
  const 
const headerString: string
headerString = 
const header: readonly (keyof Object)[]
header.
ReadonlyArray<keyof Object>.join(separator?: string): string
Adds all the elements of an array separated by the specified separator string.
@param ― separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
join(",");
  // handle null or undefined values here
  const 
const replacer: (_key: unknown, value: unknown) => string
replacer = (
_key: unknown
_key: unknown, 
value: unknown
value: unknown) => (!!
value: unknown
value ? 
value: {}
value.
Object.toString(): string
Returns a string representation of an object.
toString() : "");
  const 
const rowItems: string[]
rowItems = 
items: Object[]
items.
Array<Object>.map<string>(callbackfn: (value: Object, index: number, array: Object[]) => string, thisArg?: any): string[]
Calls a defined callback function on each element of an array, and returns an array that contains the results.
@param ― callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
@param ― thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
map((
row: Object
row) => {
    return 
const header: readonly (keyof Object)[]
header.
ReadonlyArray<keyof Object>.map<string>(callbackfn: (value: keyof Object, index: number, array: readonly (keyof Object)[]) => string, thisArg?: any): string[]
Calls a defined callback function on each element of an array, and returns an array that contains the results.
@param ― callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
@param ― thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
map((
fieldName: keyof Object
fieldName) => 
var JSON: JSON
An intrinsic object that provides functions to convert JavaScript values to and from the JavaScript Object Notation (JSON) format.
JSON.
JSON.stringify(value: any, replacer?: (this: any, key: string, value: any) => any, space?: string | number): string (+1 overload)
Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
@param ― value A JavaScript value, usually an object or array, to be converted.
@param ― replacer A function that transforms the results.
@param ― space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
@throws ― {TypeError} If a circular reference or a BigInt value is found.
stringify(
row: Object
row[
fieldName: keyof Object
fieldName], 
const replacer: (_key: unknown, value: unknown) => string
replacer)).
Array<string>.join(separator?: string): string
Adds all the elements of an array into a string, separated by the specified separator string.
@param ― separator A string used to separate one element of the array from the next in the resulting string. If omitted, the array elements are separated with a comma.
join(",");
  });
  // join header and body, and break into separate lines
  const 
const csv: string
csv = [
const headerString: string
headerString, ...
const rowItems: string[]
rowItems].
Array<string>.join(separator?: string): string
Adds all the elements of an array into a string, separated by the specified separator string.
@param ― separator A string used to separate one element of the array from the next in the resulting string. If omitted, the array elements are separated with a comma.
join("\r\n");
  return 
const csv: string
csv;
}