SyntaxError: Invalid character: '\0'

[mikoSTAR]

Hi,

We use razzle and react for our project and it seems one of our libraries use punycode.js as it's dependency. We track our errors using Sentry.

We came across this error:

SyntaxError
Invalid character: '\0'

on device and browser:

browser
Mobile Safari UI/WKWebView 13.3.1
iPhone
os
iOS 13.3.1

which leads us to this code:

/***/ }),

/***/ "./node_modules/core-js/internals/punycode-to-ascii.js":
/*!*************************************************************!*\
  !*** ./node_modules/core-js/internals/punycode-to-ascii.js ***!
  \*************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

"use strict";

// based on https://github.com/bestiejs/punycode.js/blob/master/punycode.js
var maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
var base = 36;
var tMin = 1;
var tMax = 26;
var skew = 38;
var damp = 700;
var initialBias = 72;
var initialN = 128; // 0x80
var delimiter = '-'; // '\x2D'
var regexNonASCII = /[^\0-\u007E]/; // non-ASCII chars
var regexSeparators = /[.\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
var OVERFLOW_ERROR = 'Overflow: input needs wider integers to process';

seems like this line is causing a problem: var regexNonASCII = /[^\0-\u007E]/; // non-ASCII chars

any clues on that?

cheers,

[mathiasbynens]

\0 is a valid escape sequence for U+0000 within string literals, template literals, and regular expression literals. Which JS engine are you seeing this issue in?

[mikoSTAR]

Hey thank you for quick reply. Issue appears on this kind of devices and browsers.

browser
Mobile Safari UI/WKWebView 13.3.1
iPhone
os
iOS 13.3.1

or

browser
Mobile Safari UI/WKWebView 12.4.4
device
iPhone
iOS 12.4.4

I was not able to fine exact JS engine but had a research and it looks like WKWebView stands for https://developer.apple.com/documentation/webkit/wkwebview

so it looks like it is some iOS app which use that WKWebView browser to display a content and that browser reacts different than standard Safari browser.

Let me know if it is useful

[mathiasbynens]

Is this still an issue in practice? This is clearly a browser bug which hopefully has been resolved by now. I’ll close this issue for now but please post if you have any updates.