wip(srr): slot outlet

packages/server-renderer/src/helpers/renderSlot.ts

@@ -0,0 +1,35 @@
+import { Props, PushFn, renderVNodeChildren } from '../renderToString'
+import { ComponentInternalInstance, Slot, Slots } from 'vue'
+
+export type SSRSlots = Record<string, SSRSlot>
+
+export type SSRSlot = (
+  props: Props,
+  push: PushFn,
+  parentComponent: ComponentInternalInstance | null
+) => void
+
+export function renderSlot(
+  slots: Slots | SSRSlots,
+  slotName: string,
+  slotProps: Props,
+  fallbackRenderFn: (() => void) | null,
+  push: PushFn,
+  parentComponent: ComponentInternalInstance | null = null
+) {
+  const slotFn = slots[slotName]
+  // template-compiled slots are always rendered as fragments
+  push(`<!---->`)
+  if (slotFn) {
+    if (slotFn.length > 1) {
+      // only ssr-optimized slot fns accept more than 1 arguments
+      slotFn(slotProps, push, parentComponent)
+    } else {
+      // normal slot
+      renderVNodeChildren(push, (slotFn as Slot)(slotProps), parentComponent)
+    }
+  } else if (fallbackRenderFn) {
+    fallbackRenderFn()
+  }
+  push(`<!---->`)
+}