Some application break on specific mobile device or environment. #1098
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Pull request number #1041 break app in some mobile browser that Promise.then is not writeable. (We tested on Samsung Galaxy A5) I agree #1041 code change because it is not writable. But i think just break some application without any warning message is not right. So i add fallback code and display some wraning message for that.
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| console.error(`Cannot found Promise#then method. Please add polyfill to using \`Promise\`. If you already did that. Perhaps Promise#then is not writeable. If you want to use it. add following codes to your \`polyfill.ts\` after \`import 'zone.js/dist/zone'\` | ||
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| if (!(Promise.prototype as any)['__zone_symbol__then']) { |
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the code should not be added here, because it means the current microTask will not be scheduled. If you think this logic need to be handled, you need to add the logic to patchThen method, but I don't think we need to handle old browser like chrome 34.
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this line is not code. just part of template string.
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ok. got it, in fact, I forget I already fixed this one in #1079. So please wait for the next release.
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No #1079 is not initialize Promise.__zone_symbol__then because Promise.then is not patchable OK?
~~The problem is https://github.com/angular/zone.js/pull/1098/files/d4ac887fd112c3fde3a167223c42ecbac76c1f14#diff-dd469785fca8680a5b33b1e81c5cfd91R1276 ~~
nativeMicroTaskQueuePromise is Promise and symbolThen is '__zone_symbol__then. so Invoking Promise. __zone_symbol__then` is always throwing error.
But some case. Promise.then is not patchable but the error message only undefined is not function and no other error message, no error stack trace. in this case It's very hard to find this problem.
It is not problem of only old browser. If some library set Promise.then to not patchable. developer will be face this problem and searching what is the matter of this error message.
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@JiaLiPassion Oh #1079 is exactly i want. I will wating next release. 👍
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OK, sure, thank you for reporting the issue.
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Duplicate #1079. |
Pull request number #1041 break app in some mobile browser that Promise.then is not writeable. (We tested on Samsung Galaxy A5) and I agree #1041 code change because it is not writable.
But I think just break some application without any warning message is not right. It's very hard to debugging because error message is
undefined is not functionand no any useful information like message or stacktrace.So i add fallback code and display some warning message for that. If you don't want my PR. please suggest other way to notify the user.