refactor(ssr): move escapeHtml to shared

packages/shared/__tests__/escapeHtml.spec.ts

@@ -0,0 +1,11 @@
+import { escapeHtml } from '../src'
+
+test('ssr: escapeHTML', () => {
+  expect(escapeHtml(`foo`)).toBe(`foo`)
+  expect(escapeHtml(true)).toBe(`true`)
+  expect(escapeHtml(false)).toBe(`false`)
+  expect(escapeHtml(`a && b`)).toBe(`a && b`)
+  expect(escapeHtml(`"foo"`)).toBe(`"foo"`)
+  expect(escapeHtml(`'bar'`)).toBe(`'bar'`)
+  expect(escapeHtml(`<div>`)).toBe(`&lt;div&gt;`)
+})