A function that takes an object and outputs a query string. Booleans are mapped into 1 and 0. Supports arrays of values.

buildQueryString.ts

type ValueType =
  | string
  | number
  | boolean
  | null
  | undefined
  | (string | number | boolean | null | undefined)[]

function mapBooleans(key: string, value: ValueType) {
  switch (value) {
    case true:
      return `${key}=1`
    case false:
      return `${key}=0`
    default:
      return `${key}=${value}`
  }
}

const buildQueryString = (
  query: Record<string, string | number | null | boolean | undefined>,
) =>
  Object.entries(query)
    .filter(([, value]) => value !== undefined || value !== null)
    .map(([key, value]) => {
      if (Array.isArray(value)) {
        return value.map
      }

      return mapBooleans(key, value)
    })
    .join("&")

export default buildQueryString