Remove IE11-specific code #4603
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Since IE11 is not supported anymore.
Frank3K
commented
Dec 20, 2023
Comment on lines
-209
to
-236
| /** | ||
| * Returns the first key in a Map in iteration order. | ||
| * | ||
| * NOTE(cdata): This is necessary because IE11 does not implement iterator | ||
| * methods of Map, and polymer-build does not polyfill these methods for | ||
| * compatibility and performance reasons. This helper proposes that it is | ||
| * a reasonable compromise to sacrifice a very small amount of runtime | ||
| * performance in IE11 for the sake of code clarity. | ||
| */ | ||
| export const getFirstMapKey = <T = any, U = any>(map: Map<T, U>): T|null => { | ||
| if (map.keys != null) { | ||
| return map.keys().next().value || null; | ||
| } | ||
|
|
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| let firstKey: T|null = null; | ||
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| try { | ||
| map.forEach((_value: U, key: T, _map: Map<T, U>) => { | ||
| firstKey = key; | ||
| // Stop iterating the Map with forEach: | ||
| throw new Error(); | ||
| }); | ||
| } catch (_error) { | ||
| } | ||
|
|
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| return firstKey; | ||
| }; | ||
|
|
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This method (containing IE11 specific code) was not used anymore.
elalish
approved these changes
Dec 20, 2023
JL-Vidinoti
pushed a commit
to vidinoti/model-viewer
that referenced
this pull request
Apr 22, 2024
* Remove unused method * Refactor IE11-specific code Since IE11 is not supported anymore.
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Description
While browsing through the code, I found some IE11-specific code. Since IE11 is not a supported browser anymore (by model-viewer's README), nor by three.js, I think this code can be refactored to more modern code. This change leads to a somewhat smaller bundle size.
Bundle size
File size after a
npm run build:Testing
npm run testsucceeds on my local machine.UMD bundles
In the rollup config I found this code:
model-viewer/packages/model-viewer/rollup.config.js
Lines 73 to 83 in 99fa9a8
If I understand correctly this is not just for IE11, but for any browser that does not support ES Modules. The specific lines were introduced in 92111b3. Since all modern / supported browsers support ES6 Modules (caniuse), I doubt if the UMD bundles are still required. I do not see any usage of the umd bundles in the repository itself (e.g. in the aforementioned unit test build).
Because I am not sure, I did not touch the rollup config.