RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD'

RangeError: The normalization form should be one of NFC, NFD, NFKC, NFKD. (V8-based)
RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD' (Firefox)
RangeError: argument does not match any normalization form (Safari)

The String.prototype.normalize() method only accepts the following four values as its form argument: "NFC", "NFD", "NFKC", or "NFKD". If you pass any other value, an error will be thrown. Read the reference of normalize() to learn about different normalization forms.

• String.prototype.normalize()