Speed up TimeZone and ZonedDateTime code and tests #1629
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Creating Intl.DateTimeFormat instances in V8 is slow and memory heavy. GetFormatterParts and GetCanonicalTimeZoneIdentifier are functions that are called many times when using Temporal, and they used to create new instances of Intl.DateTimeFormat for each call. In this commit, we cache them using the time zone identifier as the key. It should be noted that doing the same to SystemTimeZone was avoided. This is due to the fact that user's time zone may change during the execution of a program. An example: Temporal.now.zonedDateTimeISO() should always output the correct time zone. This shouldn't be a problem for server-side code that usually doesn't (or rather, shouldn't) use the time zone from the environment for calculations. (ported from js-temporal/temporal-polyfill#10)
Codecov Report
@@ Coverage Diff @@
## main #1629 +/- ##
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Coverage 95.00% 95.00%
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Files 19 19
Lines 10724 10726 +2
Branches 1714 1716 +2
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+ Hits 10188 10190 +2
Misses 523 523
Partials 13 13
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This speeds up the tests which are painfully slow! |
ptomato
approved these changes
Jul 12, 2021
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Creating
Intl.DateTimeFormatinstances in V8 is slow and memory heavy.ES.GetFormatterPartsandES.GetCanonicalTimeZoneIdentifierare functions that are called many times when using Temporal, and they used to create new instances of Intl.DateTimeFormat for each call. In this commit, we cache them using the time zone identifier as the key.It should be noted that doing the same to SystemTimeZone was avoided. This is due to the fact that user's time zone may change during the execution of a program. An example:
Temporal.now.zonedDateTimeISO()should always output the correct time zone. This shouldn't be a problem for server-side code that usually doesn't (or rather, shouldn't) use the time zone from the environment for calculations.This PR was ported from js-temporal/temporal-polyfill#10.