Refactor Vue components using Composition API #230

- Migrate `StatefulVue`:
  - Introduce `UseCollectionState` that replaces its behavior and acts
    as a shared state store.
  - Add more encapsulated, granular functions based on read or write
    access to state in CollectionState.
- Some linting rules get activates due to new code-base compability to
  modern parses, fix linting errors.
  - Rename Dialog to ModalDialog as after refactoring,
    eslintvue/no-reserved-component-names does not allow name Dialog.
  - To comply with `vue/multi-word-component-names`, rename:
    - `Code`          -> `CodeInstruction`
    - `Handle`        -> `SliderHandle`
    - `Documentable`  -> `DocumentableNode`
    - `Node`          -> `NodeContent`
    - `INode`         -> `INodeContent`
    - `Responsive`    -> `SizeObserver`
- Remove `vue-property-decorator` and `vue-class-component`
  dependencies.
- Refactor `watch` with computed properties when possible for cleaner
  code.
  - Introduce `UseApplication` to reduce repeated code in new components
    that use `computed` more heavily than before.
- Change TypeScript target to `es2017` to allow top level async calls
  for getting application context/state/instance to simplify the code by
  removing async calls. However, mocha (unit and integration) tests do
  not run with top level awaits, so a workaround is used.

src/presentation/components/Scripts/Slider/HorizontalResizeSlider.vue

@@ -2,16 +2,16 @@
   <div
     class="slider"
     v-bind:style="{
-      '--vertical-margin': this.verticalMargin,
-      '--first-min-width': this.firstMinWidth,
-      '--first-initial-width': this.firstInitialWidth,
-      '--second-min-width': this.secondMinWidth,
+      '--vertical-margin': verticalMargin,
+      '--first-min-width': firstMinWidth,
+      '--first-initial-width': firstInitialWidth,
+      '--second-min-width': secondMinWidth,
     }"
   >
     <div class="first" ref="firstElement">
       <slot name="first" />
     </div>
-    <Handle class="handle" @resized="onResize($event)" />
+    <SliderHandle class="handle" @resized="onResize($event)" />
     <div class="second">
       <slot name="second" />
     </div>
@@ -19,30 +19,45 @@
 </template>
 
 <script lang="ts">
-import { Component, Vue, Prop } from 'vue-property-decorator';
-import Handle from './Handle.vue';
+import { defineComponent, ref } from 'vue';
+import SliderHandle from './SliderHandle.vue';
 
-@Component({
+export default defineComponent({
   components: {
-    Handle,
+    SliderHandle,
   },
-})
-export default class HorizontalResizeSlider extends Vue {
-  @Prop() public verticalMargin: string;
+  props: {
+    verticalMargin: {
+      type: String,
+      required: true,
+    },
+    firstMinWidth: {
+      type: String,
+      required: true,
+    },
+    firstInitialWidth: {
+      type: String,
+      required: true,
+    },
+    secondMinWidth: {
+      type: String,
+      required: true,
+    },
+  },
+  setup() {
+    const firstElement = ref<HTMLElement>();
 
-  @Prop() public firstMinWidth: string;
+    function onResize(displacementX: number): void {
+      const leftWidth = firstElement.value.offsetWidth + displacementX;
+      firstElement.value.style.width = `${leftWidth}px`;
+    }
 
-  @Prop() public firstInitialWidth: string;
-
-  @Prop() public secondMinWidth: string;
-
-  private get left(): HTMLElement { return this.$refs.firstElement as HTMLElement; }
-
-  public onResize(displacementX: number): void {
-    const leftWidth = this.left.offsetWidth + displacementX;
-    this.left.style.width = `${leftWidth}px`;
-  }
-}
+    return {
+      firstElement,
+      onResize,
+    };
+  },
+});
 </script>
 
 <style lang="scss" scoped>