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Showing content from https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Errors/Not_a_valid_code_point below:

RangeError: argument is not a valid code point - JavaScript

RangeError: Invalid code point {0} (Edge)
RangeError: {0} is not a valid code point (Firefox)
RangeError: Invalid code point {0} (Chrome)

String.fromCodePoint() dispara esse erro quando são passados valores NaN, inteiros negativos (-1), não inteiros (5.4), ou valores maiores que 0x10FFFF (1114111).

Um code point é um valor Unicode; isto é,é um valor inteiro entre 0 e 0x10FFFF.

String.fromCodePoint("_"); // RangeError
String.fromCodePoint(Infinity); // RangeError
String.fromCodePoint(-1); // RangeError
String.fromCodePoint(3.14); // RangeError
String.fromCodePoint(3e-2); // RangeError
String.fromCodePoint(NaN); // RangeError

String.fromCodePoint(42); // "*"
String.fromCodePoint(65, 90); // "AZ"
String.fromCodePoint(0x404); // "\u0404"
String.fromCodePoint(0x2f804); // "\uD87E\uDC04"
String.fromCodePoint(194564); // "\uD87E\uDC04"
String.fromCodePoint(0x1d306, 0x61, 0x1d307); // "\uD834\uDF06a\uD834\uDF07"

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