Converts a formatted key hash to a base64-encoded string (CEP-18 key encoding) for use in JavaScript.

This function acts as a wrapper around get_base64_key_from_key_hash and maps errors to JavaScript-compatible errors.

Arguments

• formatted_key_hash - A hex-formatted string representing the key hash. Example: "hash-b485c074cef7ccaccd0302949d2043ab7133abdb14cfa87e8392945c0bd80a5f"

Returns

Returns a Result containing the base64-encoded string on success. Example: "AbSFwHTO98yszQMClJ0gQ6txM6vbFM+ofoOSlFwL2Apf"

Errors

This function returns a JsError if:

• The input string is not a valid formatted key hash.
• The conversion to bytes or base64 encoding fails.

The error message is formatted as a JavaScript-compatible string.