surma · July 28, 2020 13:13 · Jul 28, 2020
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,3 @@
+build
+node_modules
+package-lock.json
diff --git a/dynamic.js b/dynamic.js
@@ -0,0 +1 @@
+console.log("lol");
diff --git a/input.js b/input.js
@@ -0,0 +1 @@
+import("./dynamic.js");
diff --git a/package.json b/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "rollup-purge",
+  "scripts": {
+    "build": "rollup -c"
+  }
+}
diff --git a/rollup.config.js b/rollup.config.js
@@ -0,0 +1,43 @@
+const MARKER = "myimport:";
+
+export default {
+  input: "input.js",
+  output: {
+    dir: "build",
+    format: "esm"
+  },
+  preserveEntrySignatures: false,
+  plugins: [
+    {
+      resolveId(id) {
+        if (id === MARKER) {
+          return MARKER;
+        }
+      },
+      load(id) {
+        if (id === MARKER) {
+          return `export function myimport(id){}`;
+        }
+      },
+      transform(code, id) {
+        if (id === MARKER) {
+          return;
+        }
+        return `
+					import {myimport} from "${MARKER}"; ${code}
+					// It works with the following line 
+					// self[Symbol()] = myimport;
+				`;
+      },
+      renderDynamicImport(moduleId) {
+        if (moduleId === MARKER) {
+          return;
+        }
+        return {
+          left: "myimport(",
+          right: ", import.meta.url)"
+        };
+      }
+    }
+  ]
+};
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