wip: initial compat build setup

packages/shared/src/deprecations.ts

@@ -0,0 +1,25 @@
+export const enum DeprecationTypes {
+  DOM_TEMPLATE_MOUNT
+}
+
+type DeprecationData = {
+  message: string
+  link?: string
+}
+
+const deprecations: Record<DeprecationTypes, DeprecationData> = {
+  [DeprecationTypes.DOM_TEMPLATE_MOUNT]: {
+    message:
+      `Vue detected directives on the mount container. ` +
+      `In Vue 3, the container is no longer considered part of the template ` +
+      `and will not be processed/replaced.`,
+    link: `https://v3.vuejs.org/guide/migration/mount-changes.html`
+  }
+}
+
+export function warnDeprecation(key: DeprecationTypes) {
+  const { message, link } = deprecations[key]
+  console.warn(
+    `[Deprecation]: ${message}${link ? `\nFor more details, see ${link}` : ``}`
+  )
+}

packages/shared/src/index.ts

@@ -12,6 +12,7 @@ export * from './domAttrConfig'
 export * from './escapeHtml'
 export * from './looseEqual'
 export * from './toDisplayString'
+export * from './deprecations'
 
 /**
  * List of @babel/parser plugins that are used for template expression