chore(lint): apply recommended lint rules

src/components/DatePicker/DatePicker.svelte

@@ -22,7 +22,6 @@
 
   let inputs = writable([]);
   let inputIds = derived(inputs, _ => _.map(({ id }) => id));
-  let inputsById = derived(inputs, _ => _.reduce((a, c) => ({ ...a, [c.id]: c }), {}));
   let labelTextEmpty = derived(inputs, _ => _.filter(({ labelText }) => !!labelText).length === 0);
   let inputValue = writable(value);
   let mode = writable(datePickerType);
@@ -48,7 +47,7 @@
         inputRefTo = ref;
       }
     },
-    updateValue: ({ id, type, value }) => {
+    updateValue: ({ type, value }) => {
       if ((!calendar && type === 'input') || type === 'change') {
         inputValue.set(value);
       }

src/components/DatePicker/DatePickerInput.svelte

@@ -30,7 +30,6 @@
   } = getContext('DatePicker');
 
   let inputRef = undefined;
-  let iconRef = undefined;
 
   add({ id, labelText });
 
@@ -56,10 +55,10 @@
       class={cx('--date-picker__input')}
       on:input
       on:input={({ target }) => {
-        updateValue({ id, type: 'input', value: target.value });
+        updateValue({ type: 'input', value: target.value });
       }}
       on:change={({ target }) => {
-        updateValue({ id, type: 'change', value: target.value });
+        updateValue({ type: 'change', value: target.value });
       }}
       on:keydown
       on:keydown={({ key }) => {

src/components/DatePicker/flatpickr.js

@@ -65,10 +65,10 @@ function createCalendar({ options, base, input, dispatch }) {
     onClose: () => {
       dispatch('close');
     },
-    onMonthChange: ({}, {}, instance) => {
+    onMonthChange: (s, d, instance) => {
       updateMonthNode(instance);
     },
-    onOpen: ({}, {}, instance) => {
+    onOpen: (s, d, instance) => {
       dispatch('open');
       updateClasses(instance);
       updateMonthNode(instance);