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fix: avoid SharedArrayBuffer until required #59

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Merged
merged 3 commits into from
May 3, 2021
Merged

fix: avoid SharedArrayBuffer until required #59

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de16a49
feat: avoid SharedArrayBuffer until required
snyamathi Apr 21, 2021
62f00fd
fix: remove getter, store copy of SAB
snyamathi Apr 21, 2021
6a8d35c
fix: handle SharedArrayBuffer not existing
snyamathi Apr 21, 2021
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fix: remove getter, store copy of SAB
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@snyamathi
snyamathi committed Apr 21, 2021
commit 62f00fd96de23ba82685b819f7ecfb20b94a9bc6
25 changes: 8 additions & 17 deletions support/types.js
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Original file line number Diff line number Diff line change
Expand Up @@ -235,32 +235,23 @@ function isDataView(value) {
}
exports.isDataView = isDataView;

// Store a copy of SharedArrayBuffer in case it's deleted elsewhere
var SharedArrayBufferCopy = SharedArrayBuffer;
function isSharedArrayBufferToString(value) {
return ObjectToString(value) === '[object SharedArrayBuffer]';
}
// Avoid invoking SharedArrayBuffer constructor until required, then memoize
Object.defineProperty(isSharedArrayBufferToString, 'working', {
get: (function() {
var isWorking;
return function () {
if (isWorking === undefined) {
isWorking = (
typeof SharedArrayBuffer !== 'undefined' &&
isSharedArrayBufferToString(new SharedArrayBuffer())
)
}
return isWorking;
}
})()
});
function isSharedArrayBuffer(value) {
if (typeof SharedArrayBuffer === 'undefined') {
if (typeof SharedArrayBufferCopy === 'undefined') {
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@snyamathi snyamathi Apr 21, 2021 •
edited
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So after this change, we would check calls at some later time against the copy of SharedArrayBuffer which existed initially. Even if someone deleted SharedArrayBuffer we would still return correctly for any buffers created before SharedArrayBuffer was deleted.

.. it does look ugly though 😛

return false;
}

if (typeof isSharedArrayBufferToString.working === 'undefined') {
isSharedArrayBufferToString.working = isSharedArrayBufferToString(new SharedArrayBufferCopy());
}

return isSharedArrayBufferToString.working
? isSharedArrayBufferToString(value)
: value instanceof SharedArrayBuffer;
: value instanceof SharedArrayBufferCopy;
}
exports.isSharedArrayBuffer = isSharedArrayBuffer;

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