40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
[modern]
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# Support for dynamic import is the main litmus test for serving modern builds.
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# Although officially a ES2020 feature, browsers implemented it early, so this
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# enables all of ES2017 and some features in ES2018.
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supports es6-module-dynamic-import
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# Exclude Safari 11-12 because of a bug in tagged template literals
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# https://bugs.webkit.org/show_bug.cgi?id=190756
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# Note: Dropping version 11 also enables several more ES2018 features
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not Safari < 13
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not iOS < 13
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# Exclude KaiOS, QQ, and UC browsers due to lack of sufficient feature support data
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# Babel ignores these automatically, but we need here for Webpack to output ESM with dynamic imports
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not KaiOS > 0
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not QQAndroid > 0
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not UCAndroid > 0
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# Exclude unsupported browsers
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not dead
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[legacy]
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# Legacy builds are served when modern requirements are not met and support browsers:
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# - released in the last 7 years + current alpha/beta versionss
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# - with global utilization above 0.05%
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# The lattermost query ensures that support for popular old browsers is not dropped too early
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# (e.g. IE 11, Android 4.4, or Samsung 4).
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#
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# In addition, legacy browsers must support some minimum features that cannot be polyfilled:
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# - ES5 (strict mode)
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# - web sockets to communicate with backend
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# - inline SVG used widely in buttons, widgets, etc.
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# - custom events used for most user interactions
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# - CSS flexbox used in the majority of the layout
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# Nearly all of these are redundant with the above rules.
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# As of May 2023, only web sockets must be added to the query.
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unreleased versions
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last 7 years
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> 0.05% and supports websockets
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