private scanHexEscape()

in src/scanner.ts [390:402]

• 12 lines of code
• 5 McCabe index (conditional complexity)

    private scanHexEscape(prefix: string): string | null {
        const len = (prefix === 'u') ? 4 : 2;
        let code = 0;

        for (let i = 0; i < len; ++i) {
            if (!this.eof() && Character.isHexDigit(this.source.charCodeAt(this.index))) {
                code = code * 16 + hexValue(this.source[this.index++]);
            } else {
                return null;
            }
        }
        return String.fromCharCode(code);
    }