stream: remove isPromise utility function #35925
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Review requested:
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ronag
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Nov 2, 2020
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Yes the behavior is the same. Another way would be to change the name of the function |
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Actually the current implementation (and the one in this PR) is wrong if someone passes a It's not a big bug but promise test suites check for it. The correct implementation would be to do it in "two steps":
See here for an example |
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The function was not checking if the parameter was actually a Promise instance, but if it has a `then` method. Removing the utility function in favor of a clearer `typeof` check, handling the case when the thenable throws if then method is accessed more than once.
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I've implemented the solution suggested by @benjamingr, PTAL. |
benjamingr
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Nov 2, 2020
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Test added! It does fail on master and not with this PR, PTAL. @ronag Have your concerns been addressed? |
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@ronag are you still blocking this or can your objection be dismissed? |
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The function was not checking if the parameter was actually a Promise instance, but if it has a `then` method. Removing the utility function in favor of a clearer `typeof` check, handling the case when the thenable throws if then method is accessed more than once. PR-URL: #35925 Reviewed-By: Robert Nagy <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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The function was not checking if the parameter was actually a Promise instance, but if it has a `then` method. Removing the utility function in favor of a clearer `typeof` check, handling the case when the thenable throws if then method is accessed more than once. PR-URL: #35925 Reviewed-By: Robert Nagy <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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The function was not checking if the parameter was actually a Promise instance, but if it has a `then` method. Removing the utility function in favor of a clearer `typeof` check, handling the case when the thenable throws if then method is accessed more than once. PR-URL: #35925 Reviewed-By: Robert Nagy <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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The function was not checking if the parameter was actually a Promise
instance, but if it has a
thenmethod. Removing the utility functionin favor of a clearer
typeofcheck, handling the case when thethenable throws if then method is accessed more than once.
The difference between a thenable and a
Promisemay be important when using third party library (the parameter is provided by the user) and/or whenPromise.prototype.thenvalue is changed from userland.Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes