build(vite): replace webpack with Vite, add Typescript (#1594)

BREAKING: mixins are no longer exported from the index (and will likely be converted to hooks)

vite.config.ts

@@ -0,0 +1,42 @@
+import { resolve } from 'path'
+import { fileURLToPath, URL } from 'url'
+
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+    plugins: [vue()],
+    publicDir: false,
+    resolve: {
+        alias: {
+            '@': fileURLToPath(new URL('./src', import.meta.url)),
+            '@tests': fileURLToPath(new URL('./tests', import.meta.url)),
+        },
+    },
+    build: {
+        target: 'es2015',
+        lib: {
+            entry: resolve(__dirname, 'src/index.js'),
+            name: 'vue-select',
+            fileName: (format) => `vue-select.${format}.js`,
+        },
+        rollupOptions: {
+            external: ['vue'],
+            output: {
+                globals: { vue: 'Vue' },
+                assetFileNames(chunk): string {
+                    if (chunk.name === 'style.css') {
+                        return 'vue-select.css'
+                    }
+                    return chunk.name || ''
+                },
+            },
+        },
+    },
+    test: {
+        coverage: {
+            reporter: ['lcov'],
+        },
+    },
+})