Function isCurrencySymbol

isCurrencySymbol(symbol: unknown): symbol is valueof<{ [key: string]: string }>
Type guard to validate if a value is a valid currency symbol. Checks if the value is a string and if it is in the CURRENCY_SYMBOL_MAP.
Parameters
- symbol: unknown
  The value to validate
Returns symbol is valueof<{ [key: string]: string }>
Type predicate indicating if the value is a valid currency symbol
Typeguard
Example
```
const validSymbol = "$";
if (isCurrencySymbol(validSymbol)) {
  console.log("Valid currency symbol:", validSymbol);
} else {
  console.log("Invalid currency symbol:", validSymbol);
}
```
- Defined in src/utils/typeGuards/common.ts:398

src