Migrate to Vue 3.0 #230

- Migrate from "Vue 2.X" to "Vue 3.X"
- Migrate from "Vue Test Utils v1" to "Vue Test Utils v2"

Changes in detail:

- Change `inserted` to `mounted`.
- Change `::v-deep` to `:deep`.
- Change to Vue 3.0 `v-modal` syntax.
- Remove old Vue 2.0 transition name, keep the ones for Vue 3.0.
- Use new global mounting API `createApp`.
- Change `destroy` to `unmount`.
- Bootstrapping:
  - Move `provide`s for global dependencies to a bootsrapper from
    `App.vue`.
  - Remove `productionTip` setting (not in Vue 3).
  - Change `IVueBootstrapper` for simplicity and Vue 3 compatible API.
  - Add missing tests.
- Remove `.text` access on `VNode` as it's now internal API of Vue.
- Import `CSSProperties` from `vue` instead of `jsx` package.
- Shims:
  - Remove unused `shims-tsx.d.ts`.
  - Remove `shims-vue.d.ts` that's missing in quickstart template.
- Unit tests:
  - Remove old typing workaround for mounting components.
  - Rename `propsData` to `props`.
  - Remove unneeded `any` cast workarounds.
  - Move stubs and `provide`s under `global` object.

Other changes:

- Add `dmg-license` dependency explicitly due to failing electron builds
  on macOS (electron-userland/electron-builder#6520,
  electron-userland/electron-builder#6489). This was a side-effect of
  updating dependencies for this commit.

src/presentation/components/Code/CodeButtons/Instructions/CodeInstruction.vue

@@ -1,7 +1,7 @@
 <template>
   <span class="code-wrapper">
     <span class="dollar">$</span>
-    <code><slot /></code>
+    <code ref="codeElement"><slot /></code>
     <TooltipWrapper>
       <AppIcon
         class="copy-button"
@@ -16,7 +16,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent, useSlots } from 'vue';
+import { defineComponent, shallowRef } from 'vue';
 import { Clipboard } from '@/infrastructure/Clipboard';
 import TooltipWrapper from '@/presentation/components/Shared/TooltipWrapper.vue';
 import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
@@ -27,15 +27,23 @@ export default defineComponent({
     AppIcon,
   },
   setup() {
-    const slots = useSlots();
+    const codeElement = shallowRef<HTMLElement | undefined>();
 
     function copyCode() {
-      const code = slots.default()[0].text;
+      const element = codeElement.value;
+      if (!element) {
+        throw new Error('Code element could not be found.');
+      }
+      const code = element.textContent;
+      if (!code) {
+        throw new Error('Code element does not contain any text.');
+      }
       Clipboard.copyText(code);
     }
 
     return {
       copyCode,
+      codeElement,
     };
   },
 });