wip(ssr): restructure

packages/shared/src/index.ts

@@ -6,6 +6,7 @@ export * from './globalsWhitelist'
 export * from './codeframe'
 export * from './domTagConfig'
 export * from './mockWarn'
+export * from './normalizeProp'
 
 export const EMPTY_OBJ: { readonly [key: string]: any } = __DEV__
   ? Object.freeze({})

packages/shared/src/normalizeProp.ts

@@ -0,0 +1,38 @@
+import { isArray, isString, isObject } from './'
+
+export function normalizeStyle(
+  value: unknown
+): Record<string, string | number> | void {
+  if (isArray(value)) {
+    const res: Record<string, string | number> = {}
+    for (let i = 0; i < value.length; i++) {
+      const normalized = normalizeStyle(value[i])
+      if (normalized) {
+        for (const key in normalized) {
+          res[key] = normalized[key]
+        }
+      }
+    }
+    return res
+  } else if (isObject(value)) {
+    return value
+  }
+}
+
+export function normalizeClass(value: unknown): string {
+  let res = ''
+  if (isString(value)) {
+    res = value
+  } else if (isArray(value)) {
+    for (let i = 0; i < value.length; i++) {
+      res += normalizeClass(value[i]) + ' '
+    }
+  } else if (isObject(value)) {
+    for (const name in value) {
+      if (value[name]) {
+        res += name + ' '
+      }
+    }
+  }
+  return res.trim()
+}