feat: support svelte 5.16.0 class value

packages/frameworks/svelte/src/merge-props.ts

@@ -14,8 +14,77 @@ const serialize = (style: string): CSSObject => {
   return res
 }
 
+type ClassValue = ClassValue[] | Record<string, any> | string | number | bigint | null | boolean | undefined
+
+const classValueToString = (mix: ClassValue) => {
+  let i: any
+  let j: any
+
+  let str = ""
+
+  if (typeof mix === "string" || typeof mix === "number") {
+    str += mix
+  } else if (typeof mix === "object") {
+    if (Array.isArray(mix)) {
+      const len = mix.length
+
+      for (i = 0; i < len; i++) {
+        if (mix[i]) {
+          if ((j = classValueToString(mix[i]))) {
+            str && (str += " ")
+            str += j
+          }
+        }
+      }
+    } else {
+      for (j in mix) {
+        if (mix![j]) {
+          str && (str += " ")
+          str += j
+        }
+      }
+    }
+  }
+
+  return str
+}
+
+const clsx = (...args: ClassValue[]) => {
+  let idx = 0
+  let tmp: ClassValue
+  let cls: string
+  let str = ""
+  let len = args.length
+
+  for (; idx < len; idx++) {
+    if ((tmp = args[idx])) {
+      if ((cls = classValueToString(tmp))) {
+        str && (str += " ")
+        str += cls
+      }
+    }
+  }
+
+  return str
+}
+
 export function mergeProps(...args: Record<string, any>[]) {
-  const merged = zagMergeProps(...args)
+  const copy = args.map((arg) => Object.assign({}, arg))
+  const classes: ClassValue[] = []
+
+  for (const arg of copy) {
+    if ("class" in arg) {
+      classes.push(arg.class)
+      delete arg.class
+    }
+
+    if ("className" in arg) {
+      classes.push(arg.className)
+      delete arg.className
+    }
+  }
+
+  const merged = zagMergeProps(...copy)
 
   if ("style" in merged) {
     if (typeof merged.style === "string") {
@@ -24,5 +93,6 @@ export function mergeProps(...args: Record<string, any>[]) {
     merged.style = toStyleString(merged.style)
   }
 
+  classes.length && (merged.class = clsx(...classes))
   return merged
 }

packages/frameworks/svelte/tests/merge-props.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi } from "vitest"
+import { describe, expect, it, vi } from "vitest"
 import { mergeProps } from "../src"
 
 describe("mergeProps for Svelte", () => {
@@ -10,7 +10,7 @@ describe("mergeProps for Svelte", () => {
     const props = mergeProps({ onClick, className, id })
 
     expect(props.onClick).toBe(onClick)
-    expect(props.className).toBe(className)
+    expect(props.class).toBe(className)
     expect(props.id).toBe(id)
   })
 
@@ -29,14 +29,18 @@ describe("mergeProps for Svelte", () => {
 
   it("combines css classes", () => {
     const className1 = "primary"
-    const className2 = "hover"
-    const className3 = "focus"
+    const className2 = ["hover", { focus: true }, null, undefined]
+    const className3 = {
+      md: false,
+      lg: true,
+      xl: false,
+    }
 
     const props = mergeProps({ class: className1 }, { class: className2 }, { class: className3 })
-    expect(props.class).toBe("primary hover focus")
+    expect(props.class).toBe("primary hover focus lg")
 
     const props2 = mergeProps({ className: className1 }, { className: className2 }, { className: className3 })
-    expect(props2.className).toBe("primary hover focus")
+    expect(props2.class).toBe("primary hover focus lg")
   })
 
   it("combines styles", () => {