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fix: check if 'btoa' exists for old IE versions #479

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Aug 17, 2020
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fix: check if 'btoa' exists for old IE versions #479

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2 changes: 1 addition & 1 deletion src/runtime/injectStylesIntoStyleTag.js
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,7 @@ function applyToTag(style, options, obj) {
style.removeAttribute('media');
}

if (sourceMap && btoa) {
if (sourceMap && typeof btoa !== 'undefined') {
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btoa should be undefined for old IE, can you provide screenshot?

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image

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@okchangwon okchangwon Aug 14, 2020 •
edited
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typeof should be used to check if global variables exist.

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What is IE version? It is weird, because btoa should be false here

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In IE9, btoa is undefined.
Or the following code is also good.

if (sourceMap && window.btoa) {

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I am fine with typeof, weird, I can't reproduce

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@okchangwon okchangwon Aug 14, 2020 •
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I have created an example of a problematic code to reproduce the phenomenon.

<script>
if (btoa) {
  console.log("it's exist");
} else {
  console.log("it's not exist");
}
</script>

This code causes an error in IE9.

Please check the console window on this page.
http://okchangwon.xyz/naver/ie9-btoa

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error from ie9-btoa package, not from style-loader

css += `\n/*# sourceMappingURL=data:application/json;base64,${btoa(
unescape(encodeURIComponent(JSON.stringify(sourceMap)))
)} */`;
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