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Redefine browser requirements for legacy (ES5) builds (#16384)

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Steve Repsher 2023-05-04 10:33:13 -04:00 committed by GitHub
parent d2321b535c
commit 4740ce685f
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1 changed files with 14 additions and 2 deletions
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.browserslistrc
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@ -14,8 +14,20 @@ not iOS < 13
not dead
[legacy]
# Legacy builds are transpiled to ES5 (strict mode) but also must support some features that cannot be polyfilled:
# Legacy builds are served when modern requirements are not met and support browsers:
# - released in the last 7 years + current alpha/beta versionss
# - with global utilization above 0.05%
# The lattermost query ensures that support for popular old browsers is not dropped too early
# (e.g. IE 11, Android 4.4, or Samsung 4).
#
# In addition, legacy browsers must support some minimum features that cannot be polyfilled:
# - ES5 (strict mode)
# - web sockets to communicate with backend
# - inline SVG used widely in buttons, widgets, etc.
# - custom events used for most user interactions
supports use-strict and supports websockets and supports svg-html5 and supports customevent
# - CSS flexbox used in the majority of the layout
# Nearly all of these are redundant with the above rules.
# As of May 2023, only web sockets must be added to the query.
unreleased versions
last 7 years
> 0.05% and supports websockets