chore(examples): add sapper set-up

examples/sapper/rollup.config.js

@@ -0,0 +1,118 @@
+import resolve from "@rollup/plugin-node-resolve";
+import replace from "@rollup/plugin-replace";
+import commonjs from "@rollup/plugin-commonjs";
+import svelte from "rollup-plugin-svelte";
+import babel from "@rollup/plugin-babel";
+import { terser } from "rollup-plugin-terser";
+import sveltePreprocess from "svelte-preprocess";
+import config from "sapper/config/rollup.js";
+import pkg from "./package.json";
+
+const mode = process.env.NODE_ENV;
+const dev = mode === "development";
+const legacy = !!process.env.SAPPER_LEGACY_BUILD;
+
+const onwarn = (warning, onwarn) =>
+  (warning.code === "MISSING_EXPORT" && /'preload'/.test(warning.message)) ||
+  (warning.code === "CIRCULAR_DEPENDENCY" &&
+    /[/\\]@sapper[/\\]/.test(warning.message)) ||
+  onwarn(warning);
+
+export default {
+  client: {
+    input: config.client.input(),
+    output: config.client.output(),
+    plugins: [
+      replace({
+        "process.browser": true,
+        "process.env.NODE_ENV": JSON.stringify(mode),
+      }),
+      svelte({
+        dev,
+        hydratable: true,
+        emitCss: true,
+        preprocess: sveltePreprocess(),
+      }),
+      resolve({
+        browser: true,
+        dedupe: ["svelte"],
+      }),
+      commonjs(),
+
+      legacy &&
+        babel({
+          extensions: [".js", ".mjs", ".html", ".svelte"],
+          babelHelpers: "runtime",
+          exclude: ["node_modules/@babel/**"],
+          presets: [
+            [
+              "@babel/preset-env",
+              {
+                targets: "> 0.25%, not dead",
+              },
+            ],
+          ],
+          plugins: [
+            "@babel/plugin-syntax-dynamic-import",
+            [
+              "@babel/plugin-transform-runtime",
+              {
+                useESModules: true,
+              },
+            ],
+          ],
+        }),
+
+      !dev &&
+        terser({
+          module: true,
+        }),
+    ],
+
+    preserveEntrySignatures: false,
+    onwarn,
+  },
+
+  server: {
+    input: config.server.input(),
+    output: config.server.output(),
+    plugins: [
+      replace({
+        "process.browser": false,
+        "process.env.NODE_ENV": JSON.stringify(mode),
+      }),
+      svelte({
+        generate: "ssr",
+        hydratable: true,
+        dev,
+      }),
+      resolve({
+        dedupe: ["svelte"],
+      }),
+      commonjs(),
+    ],
+    external: Object.keys(pkg.dependencies).concat(
+      require("module").builtinModules
+    ),
+
+    preserveEntrySignatures: "strict",
+    onwarn,
+  },
+
+  serviceworker: {
+    input: config.serviceworker.input(),
+    output: config.serviceworker.output(),
+    plugins: [
+      resolve(),
+      replace({
+        "process.browser": true,
+        "process.env.NODE_ENV": JSON.stringify(mode),
+      }),
+      commonjs(),
+      !dev && terser(),
+    ],
+
+    preserveEntrySignatures: false,
+    onwarn,
+  },
+};