diff --git a/packages/dynamic-import-vars/README.md b/packages/dynamic-import-vars/README.md
index 504da0f42..58c221350 100644
--- a/packages/dynamic-import-vars/README.md
+++ b/packages/dynamic-import-vars/README.md
@@ -134,7 +134,11 @@ function __variableDynamicImportRuntime__(path) {
     case './locales/nl-NL.js':
       return import('./locales/nl-NL.js');
     default:
-      throw new Error('Unknown variable dynamic import: ' + path);
+      return new Promise(function(resolve, reject) {
+        queueMicrotask(
+          reject.bind(null, new Error("Unknown variable dynamic import: " + path))
+        );
+      });
   }
 }
 
diff --git a/packages/dynamic-import-vars/src/index.js b/packages/dynamic-import-vars/src/index.js
index 5a207f7dd..93c05976d 100644
--- a/packages/dynamic-import-vars/src/index.js
+++ b/packages/dynamic-import-vars/src/index.js
@@ -52,10 +52,13 @@ function dynamicImportVariables({ include, exclude, warnOnError } = {}) {
             // will turn these into chunks automatically
             ms.prepend(
               `function __variableDynamicImportRuntime${dynamicImportIndex}__(path) {
-   switch (path) {
-  ${paths.map((p) => `   case '${p}': return import('${p}');`).join('\n  ')}
-     default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));
-   }
+  switch (path) {
+${paths.map((p) => `    case '${p}': return import('${p}');`).join('\n')}
+${`    default: return new Promise(function(resolve, reject) {
+      (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(
+        reject.bind(null, new Error("Unknown variable dynamic import: " + path))
+      );
+    })\n`}   }
  }\n\n`
             );
             // call the runtime function instead of doing a dynamic import, the import specifier will
diff --git a/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.md b/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.md
index 2ca094392..b64709270 100644
--- a/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.md
+++ b/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.md
@@ -2,74 +2,123 @@
 
 The actual snapshot is saved in `rollup-plugin-dynamic-import-vars.test.js.snap`.
 
-Generated by [AVA](https://ava.li).
+Generated by [AVA](https://avajs.dev).
 
-## can exclude files
+## single dir
 
 > Snapshot 1
 
-    `function importModule(name) {␊
-      return import(`./module-dir-a/${name}.js`);␊
+    `function __variableDynamicImportRuntime0__(path) {␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
+       }␊
+     }␊
+    ␊
+    function importModule(name) {␊
+      return __variableDynamicImportRuntime0__(`./module-dir-a/${name}.js`);␊
     }␊
     ␊
     export { importModule };␊
     `
 
-## complex concatenation
+## multiple dirs
 
 > Snapshot 1
 
     `function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
-         case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
+        case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
+        case './sub-dir/fixture-upwards-path.js': return import('./fixture-upwards-path-35191ee0.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
        }␊
      }␊
     ␊
-    function importModule(dirName, name) {␊
-      return __variableDynamicImportRuntime0__(`${`./${`module-dir-${dirName}`}` + '/'}${name}.js`);␊
+    function importModule(dir, name) {␊
+      return __variableDynamicImportRuntime0__(`./${dir}/${name}.js`);␊
     }␊
     ␊
     export { importModule };␊
     `
 
-## doesn't change imports that should not be changed
+## upwards dir path
 
 > Snapshot 1
 
-    `console.log('a-1');␊
+    `function __variableDynamicImportRuntime0__(path) {␊
+      switch (path) {␊
+        case '../module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case '../module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
+       }␊
+     }␊
     ␊
-    function importModuleA() {␊
-      return import('./module-a-2-28fb3b62.js');␊
+    function importModule(name) {␊
+      return __variableDynamicImportRuntime0__(`../module-dir-a/${name}.js`);␊
     }␊
     ␊
-    function importModuleB() {␊
-      return import('./' + 'module-dir-a' + '/' + 'module-a-2' + '.js');␊
+    export { importModule };␊
+    `
+
+## complex concatenation
+
+> Snapshot 1
+
+    `function __variableDynamicImportRuntime0__(path) {␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
+        case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
+       }␊
+     }␊
+    ␊
+    function importModule(dirName, name) {␊
+      return __variableDynamicImportRuntime0__(`${`./${`module-dir-${dirName}`}` + '/'}${name}.js`);␊
     }␊
     ␊
-    export { importModuleA, importModuleB };␊
+    export { importModule };␊
     `
 
-## multiple dirs
+## own directory
 
 > Snapshot 1
 
     `function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
-         case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
-         case './sub-dir/fixture-upwards-path.js': return import('./fixture-upwards-path-39977978.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
+      switch (path) {␊
+        case './root-module-a.js': return import('./root-module-a-53575bcc.js');␊
+        case './root-module-b.js': return import('./root-module-b-55333443.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
        }␊
      }␊
     ␊
-    function importModule(dir, name) {␊
-      return __variableDynamicImportRuntime0__(`./${dir}/${name}.js`);␊
+    function importModule(name) {␊
+      return __variableDynamicImportRuntime0__(`./root-module-${name}.js`);␊
     }␊
     ␊
     export { importModule };␊
@@ -80,29 +129,41 @@ Generated by [AVA](https://ava.li).
 > Snapshot 1
 
     `function __variableDynamicImportRuntime2__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
-         case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
-         case './sub-dir/fixture-upwards-path.js': return import('./fixture-upwards-path-39977978.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        case './module-dir-b/module-b-1.js': return import('./module-b-1-a616b1e9.js');␊
+        case './module-dir-b/module-b-2.js': return import('./module-b-2-219276fa.js');␊
+        case './sub-dir/fixture-upwards-path.js': return import('./fixture-upwards-path-35191ee0.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
        }␊
      }␊
     ␊
     function __variableDynamicImportRuntime1__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
        }␊
      }␊
     ␊
     function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
+      switch (path) {␊
+        case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
+        case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
+        default: return new Promise(function(resolve, reject) {␊
+          (typeof queueMicrotask === 'function' ? queueMicrotask : setTimeout)(␊
+            reject.bind(null, new Error("Unknown variable dynamic import: " + path))␊
+          );␊
+        })␊
        }␊
      }␊
     ␊
@@ -123,58 +184,29 @@ Generated by [AVA](https://ava.li).
     export { Foo, importModuleFromDir };␊
     `
 
-## own directory
+## doesn't change imports that should not be changed
 
 > Snapshot 1
 
-    `function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case './root-module-a.js': return import('./root-module-a-53575bcc.js');␊
-         case './root-module-b.js': return import('./root-module-b-55333443.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
-       }␊
-     }␊
+    `console.log('a-1');␊
     ␊
-    function importModule(name) {␊
-      return __variableDynamicImportRuntime0__(`./root-module-${name}.js`);␊
+    function importModuleA() {␊
+      return import('./module-a-2-28fb3b62.js');␊
     }␊
     ␊
-    export { importModule };␊
-    `
-
-## single dir
-
-> Snapshot 1
-
-    `function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case './module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case './module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
-       }␊
-     }␊
-    ␊
-    function importModule(name) {␊
-      return __variableDynamicImportRuntime0__(`./module-dir-a/${name}.js`);␊
+    function importModuleB() {␊
+      return import('./' + 'module-dir-a' + '/' + 'module-a-2' + '.js');␊
     }␊
     ␊
-    export { importModule };␊
+    export { importModuleA, importModuleB };␊
     `
 
-## upwards dir path
+## can exclude files
 
 > Snapshot 1
 
-    `function __variableDynamicImportRuntime0__(path) {␊
-       switch (path) {␊
-         case '../module-dir-a/module-a-1.js': return import('./module-a-1-a1a9dfd0.js');␊
-         case '../module-dir-a/module-a-2.js': return import('./module-a-2-28fb3b62.js');␊
-         default: return Promise.reject(new Error("Unknown variable dynamic import: " + path));␊
-       }␊
-     }␊
-    ␊
-    function importModule(name) {␊
-      return __variableDynamicImportRuntime0__(`../module-dir-a/${name}.js`);␊
+    `function importModule(name) {␊
+      return import(`./module-dir-a/${name}.js`);␊
     }␊
     ␊
     export { importModule };␊
diff --git a/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.snap b/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.snap
index ae6515af7..bd60a1d2b 100644
Binary files a/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.snap and b/packages/dynamic-import-vars/test/snapshots/rollup-plugin-dynamic-import-vars.test.js.snap differ