diff --git a/packages/build/src/utils/cachePromises.js b/packages/build/src/utils/cachePromises.js
new file mode 100644
index 000000000..1cdf548dd
--- /dev/null
+++ b/packages/build/src/utils/cachePromises.js
@@ -0,0 +1,31 @@
+/*
+  Copyright 2020-2021 Lowdefy, Inc
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+function cachedPromises(getter) {
+  const cache = {};
+
+  function getCachedPromise(key) {
+    if (cache[key]) {
+      return Promise.resolve(cache[key]);
+    }
+    cache[key] = getter(key);
+    return Promise.resolve(cache[key]);
+  }
+
+  return getCachedPromise;
+}
+
+export default cachedPromises;
diff --git a/packages/build/src/utils/files/readConfigFile.js b/packages/build/src/utils/files/readConfigFile.js
index 0c8f915df..bf24e34e7 100644
--- a/packages/build/src/utils/files/readConfigFile.js
+++ b/packages/build/src/utils/files/readConfigFile.js
@@ -17,15 +17,13 @@
 import path from 'path';
 import { readFile } from '@lowdefy/node-utils';
 
+import cachedPromises from '../cachePromises';
+
 function createReadConfigFile({ configDirectory }) {
-  const files = {};
   async function readConfigFile(filePath) {
-    if (files[filePath]) return files[filePath];
-    const fileContent = readFile(path.resolve(configDirectory, filePath));
-    files[filePath] = fileContent;
-    return fileContent;
+    return readFile(path.resolve(configDirectory, filePath));
   }
-  return readConfigFile;
+  return cachedPromises(readConfigFile);
 }
 
 export default createReadConfigFile;
diff --git a/packages/build/src/utils/meta/getMeta.js b/packages/build/src/utils/meta/getMeta.js
index 2c0ae8b54..43620f814 100644
--- a/packages/build/src/utils/meta/getMeta.js
+++ b/packages/build/src/utils/meta/getMeta.js
@@ -26,13 +26,14 @@ Steps to fetch meta
 */
 
 import { type as typeHelper } from '@lowdefy/helpers';
+
+import cachedPromises from '../cachePromises';
 import createFetchMetaCache from './fetchMetaCache';
 import createWriteMetaCache from './writeMetaCache';
 import metaLocations from './metaLocations';
 import fetchMetaUrl from './fetchMetaUrl';
 
 function createGetMeta({ blocksServerUrl, cacheDirectory, types }) {
-  const memoisedMeta = {};
   const allMetaLocations = {
     ...metaLocations({ blocksServerUrl }),
     ...types,
@@ -40,10 +41,6 @@ function createGetMeta({ blocksServerUrl, cacheDirectory, types }) {
   const fetchMetaCache = createFetchMetaCache({ cacheDirectory });
   const writeMetaCache = createWriteMetaCache({ cacheDirectory });
   async function getMeta(type) {
-    if (memoisedMeta[type]) {
-      return memoisedMeta[type];
-    }
-
     const location = allMetaLocations[type];
     if (!location) {
       throw new Error(
@@ -57,7 +54,6 @@ function createGetMeta({ blocksServerUrl, cacheDirectory, types }) {
     if (cacheMeta) {
       meta = await fetchMetaCache(location);
       if (meta) {
-        memoisedMeta[type] = meta;
         return meta;
       }
     }
@@ -65,7 +61,6 @@ function createGetMeta({ blocksServerUrl, cacheDirectory, types }) {
     meta = await fetchMetaUrl({ location, type });
     // TODO: implement Ajv schema check. Use testAjvSchema func from @lowdefy/ajv
     if (meta && typeHelper.isString(meta.category) && meta.moduleFederation) {
-      memoisedMeta[type] = meta;
       if (cacheMeta) {
         await writeMetaCache({ location, meta });
       }
@@ -76,7 +71,7 @@ function createGetMeta({ blocksServerUrl, cacheDirectory, types }) {
     );
   }
 
-  return getMeta;
+  return cachedPromises(getMeta);
 }
 
 export default createGetMeta;
diff --git a/packages/cli/src/commands/dev/shell/index.html b/packages/cli/src/commands/dev/shell/index.html
index 116524e9d..6da56b115 100644
--- a/packages/cli/src/commands/dev/shell/index.html
+++ b/packages/cli/src/commands/dev/shell/index.html
@@ -13,46 +13,46 @@
   See the License for the specific language governing permissions and
   limitations under the License. -->
 
-  <!DOCTYPE html>
-  <html lang="en">
-    <head>
-      <meta charset="utf-8" />
-      <meta name="viewport" content="width=device-width, initial-scale=1" />
-      <title>Lowdefy App</title>
-      <link rel="manifest" href="/public/manifest.webmanifest">
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Lowdefy App</title>
+    <link rel="manifest" href="/public/manifest.webmanifest" />
 
-      <link rel="icon" type="image/svg+xml" href="/public/icon.svg">
-      <link rel="icon" type="image/png" href="/public/icon-32.png">
-      <link rel="apple-touch-icon" href="/public/apple-touch-icon.png">
-      <script src="/api/dev/reload.js"></script>
-      <script type="text/javascript">
-        const jsActions = {}
-        const jsOperators = {}
-        const getMethodLoader = (scope, reference) =>
-          (name, method) => {
-            if (typeof name !== 'string') {
-              throw new Error(`${scope} requires a string for the first argument.`)
-            }
-            if (typeof method !== 'function') {
-              throw new Error(`${scope} requires a function for the second argument.`)
-            }
-            reference[name] = method;
-          }
-        window.lowdefy = {
-          imports: {
-            jsActions,
-            jsOperators,
-          },
-          registerJsAction: getMethodLoader('registerJsAction', jsActions),
-          registerJsOperator: getMethodLoader('registerJsOperator', jsOperators)
+    <link rel="icon" type="image/svg+xml" href="/public/icon.svg" />
+    <link rel="icon" type="image/png" href="/public/icon-32.png" />
+    <link rel="apple-touch-icon" href="/public/apple-touch-icon.png" />
+    <script src="/api/dev/reload.js"></script>
+    <script type="text/javascript">
+      const jsActions = {};
+      const jsOperators = {};
+      const getMethodLoader = (scope, reference) => (name, method) => {
+        if (typeof name !== 'string') {
+          throw new Error(`${scope} requires a string for the first argument.`);
         }
-      </script>
+        if (typeof method !== 'function') {
+          throw new Error(`${scope} requires a function for the second argument.`);
+        }
+        reference[name] = method;
+      };
+      window.lowdefy = {
+        basePath: '',
+        imports: {
+          jsActions,
+          jsOperators,
+        },
+        registerJsAction: getMethodLoader('registerJsAction', jsActions),
+        registerJsOperator: getMethodLoader('registerJsOperator', jsOperators),
+      };
+    </script>
     <!-- __LOWDEFY_APP_HEAD_HTML__ -->
-    </head>
-    <body>
-      <noscript>You need to enable JavaScript to run this app.</noscript>
-      <div id="emotion"></div>
-      <div id="root"></div>
-      <!-- __LOWDEFY_APP_BODY_HTML__ -->
-    </body>
-  </html>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="emotion"></div>
+    <div id="root"></div>
+    <!-- __LOWDEFY_APP_BODY_HTML__ -->
+  </body>
+</html>
diff --git a/packages/docs/templates/blocks/exampleTransformer.js b/packages/docs/templates/blocks/exampleTransformer.js
index 690e6e8d6..d4c56cd63 100644
--- a/packages/docs/templates/blocks/exampleTransformer.js
+++ b/packages/docs/templates/blocks/exampleTransformer.js
@@ -15,7 +15,6 @@
 */
 
 const transformer = (_, obj) => {
-  console.log('transformer', _, obj);
   const examples = {
     id: 'examples',
     type: 'Box',