[lit-html] Make ClassInfo mutable (#5044)

ava-cassiopeia · web-flow · commit 0d0170e87b06 · 2025-08-22T16:03:58.000-07:00
diff --git a/.changeset/dirty-pillows-allow.md b/.changeset/dirty-pillows-allow.md
@@ -0,0 +1,8 @@
+---
+'lit': patch
+'lit-element': patch
+'lit-html': patch
+'@lit/reactive-element': patch
+---
+
+Make ClassInfo mutable
diff --git a/packages/lit-html/src/directives/class-map.ts b/packages/lit-html/src/directives/class-map.ts
@@ -17,7 +17,7 @@ import {
  * A key-value set of class names to truthy values.
  */
 export interface ClassInfo {
-  readonly [name: string]: string | boolean | number;
+  [name: string]: string | boolean | number;
 }
 
 class ClassMapDirective extends Directive {

Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,7 @@ import {`
`17`	`17`	`* A key-value set of class names to truthy values.`
`18`	`18`	`*/`
`19`	`19`	`export interface ClassInfo {`
`20`		`- readonly [name: string]: string \| boolean \| number;`
	`20`	`+ [name: string]: string \| boolean \| number;`
`21`	`21`	`}`
`22`	`22`
`23`	`23`	`class ClassMapDirective extends Directive {`