refactor(ssr): move escapeHtml to shared

packages/server-renderer/__tests__/interpolate.spec.ts

@@ -0,0 +1,28 @@
+import { escapeHtml, interpolate } from '../src'
+
+test('ssr: interpolate', () => {
+  expect(interpolate(0)).toBe(`0`)
+  expect(interpolate(`foo`)).toBe(`foo`)
+  expect(interpolate(`<div>`)).toBe(`&lt;div&gt;`)
+  // should escape interpolated values
+  expect(interpolate([1, 2, 3])).toBe(
+    escapeHtml(JSON.stringify([1, 2, 3], null, 2))
+  )
+  expect(
+    interpolate({
+      foo: 1,
+      bar: `<div>`
+    })
+  ).toBe(
+    escapeHtml(
+      JSON.stringify(
+        {
+          foo: 1,
+          bar: `<div>`
+        },
+        null,
+        2
+      )
+    )
+  )
+})