init

bin/resources/script/index.ts

@@ -0,0 +1,52 @@
+import { Observable } from "../../observable";
+import { InputPluginOption, ModuleFormat, watch } from "rollup";
+
+type ScriptOptions = {
+  path: string;
+  format: ModuleFormat;
+  plugins?: InputPluginOption;
+};
+
+const build = (options: ScriptOptions, update: (code: string) => void) =>
+  new Promise<string>((resolve, reject) => {
+    let compiled = false;
+    const watcher = watch({
+      input: options.path,
+      plugins: options.plugins,
+      onwarn: () => { },
+      output: {
+        format: options.format,
+      },
+      watch: {
+        skipWrite: true,
+      },
+    });
+
+    watcher.on("event", async (event) => {
+      if (event.code === "BUNDLE_END") {
+        const { output } = await event.result.generate({
+          format: options.format,
+        });
+        const { code } = output[0];
+        if (!compiled) {
+          resolve(code);
+          compiled = true;
+        } else {
+          update(code);
+        }
+      }
+      if (event.code === "ERROR") {
+        reject(event.error);
+      }
+    });
+  });
+
+const createScript = (options: ScriptOptions) => {
+  const script: Observable<string> = new Observable(() =>
+    build(options, (code) => script.set(() => Promise.resolve(code)))
+  );
+
+  return script;
+};
+
+export { createScript };