Function isCurrencyCode

isCurrencyCode(code: unknown): code is valueof<{ [key: string]: string }>

Type guard to validate if a value is a valid currency code. Checks if the value is a string and if it is a known currency code in the CURRENCY_CODE_MAP.

Parameters

code: unknown
The value to validate

Returns code is valueof<{ [key: string]: string }>

Type predicate indicating if the value is a valid currency code

Example

const validCode = "USD";
if (isCurrencyCode(validCode)) {
  console.log("Valid currency code:", validCode);
} else {
  console.log("Invalid currency code:", validCode);
}

Source

export function isCurrencyCode(code: unknown): code is CurrencyCode {
  // CURRENCY_SYMBOL_MAP maps code -> symbol, so its keys are the valid codes (e.g. "USD").
  return typeof code === 'string' && code in CURRENCY_SYMBOL_MAP;
}