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[lit-html] Make ClassInfo mutable #5044

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justinfagnani merged 5 commits into from
Aug 22, 2025
Merged

[lit-html] Make ClassInfo mutable #5044

justinfagnani merged 5 commits into from
Aug 22, 2025

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@ava-cassiopeia
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@ava-cassiopeia ava-cassiopeia commented Aug 20, 2025 •
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This allows for users to compose together a ClassList object dynamically. For example:

override render() {
  const classes: ClassInfo = {
    'class1': true,
    'class2': true,
  };
  // Conditionally add another class
  if (condition) classes['class3'] = true;

  // use it
  const containerClasses = classMap(classes);
  
  // etc.
}

Closes #5024

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changeset-bot bot commented Aug 20, 2025 •
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🦋 Changeset detected

Latest commit: 386bcb9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages
Name Type
lit Patch
lit-element Patch
lit-html Patch
@lit/reactive-element Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

@ava-cassiopeia ava-cassiopeia changed the title Add MutableClassList as a complement to ClassList Make ClassList mutable Aug 20, 2025
@ava-cassiopeia ava-cassiopeia marked this pull request as ready for review August 20, 2025 20:17
@justinfagnani justinfagnani changed the title Make ClassList mutable [lit-html] Make ClassInfo mutable Aug 21, 2025
justinfagnani
justinfagnani reviewed Aug 21, 2025
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justinfagnani commented Aug 21, 2025

Thanks @ava-cassiopeia!

@justinfagnani justinfagnani merged commit 0d0170e into lit:main Aug 22, 2025
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@lit-robot lit-robot mentioned this pull request Dec 18, 2025
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@justinfagnani justinfagnani justinfagnani approved these changes

@kevinpschaaf kevinpschaaf Awaiting requested review from kevinpschaaf kevinpschaaf is a code owner

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[lit-html] Provide write-able version of ClassInfo

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@ava-cassiopeia @justinfagnani