diff --git a/.github/workflows/ci-fix.yml b/.github/workflows/ci-fix.yml
new file mode 100644
index 00000000000..34cfe2721e1
--- /dev/null
+++ b/.github/workflows/ci-fix.yml
@@ -0,0 +1,86 @@
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: CI
+
+on:
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: write # to fetch code (actions/checkout)
+  pull-requests: write 
+
+jobs:
+  update-docs:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Checkout PR
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: gh pr checkout ${{ github.event.pull_request.number }}
+
+    - name: echo
+      run: |
+          set -x
+          echo "${{ toJson(github.event) }}"
+          echo ${{ github.event.pull_request.base.repo.full_name }}
+          echo $GITHUB_REPOSITORY
+          env
+
+    - name: Fetch the master branch
+      run: git fetch origin HEAD:refs/remotes/origin/HEAD --depth 1
+    - name: Fetch the master branch
+      run: git diff --name-only origin/HEAD --no-renames --diff-filter=ACMR
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm i
+    # run linter
+    - run: |
+        set -x;
+        git status;
+        git checkout HEAD -- package.json;
+        changes=$(git diff --name-only origin/HEAD --no-renames --diff-filter=ACMR);
+        if [ "$changes" == "" ]; then
+            echo "checking all files";
+            node node_modules/eslint/bin/eslint --fix "lib/ace/**/*.js";
+        else
+            jsChanges=$(echo "$changes" | grep -P '.js$' || :);
+            if [ "$jsChanges" == "" ]; then
+                echo "nothing to check";
+            else
+                echo "checking $jsChanges";
+                node node_modules/eslint/bin/eslint --fix $jsChanges;
+            fi
+        fi
+    # check types
+    - run: npm run update-types
+    - run: node_modules/.bin/tsc --noImplicitAny --strict --noUnusedLocals --noImplicitReturns --noUnusedParameters --noImplicitThis ace.d.ts
+    - run: npm run typecheck
+    # push automatic fixes to the pull request
+    - run: |
+        set -x;
+        git status;
+        git add -u
+        git reset -- build
+        git config user.name "Ace Ci Bot" 
+        git config user.email "bot@c9.io"
+        git commit -m "ci fixes" --author="Ace Ci Bot <bot@c9.io>"
+        git branch -f CI_FIXES
+        git remote -v
+        git log --all --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --    | head -n 100
+    
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        branch: ${{ github.ref }}
\ No newline at end of file
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 56a36d8505b..e4d6484a731 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -33,6 +33,7 @@ jobs:
         node-version: ${{ matrix.node-version }}
     - run: npm i
     - run: npm run cover
+    # run linter
     - run: |
         set -x;
         git status;
@@ -50,7 +51,8 @@ jobs:
                 node node_modules/eslint/bin/eslint $jsChanges;
             fi
         fi
-    # - run: npm run lint
+    # check types
+    - run: npm run update-types
     - run: node_modules/.bin/tsc --noImplicitAny --strict --noUnusedLocals --noImplicitReturns --noUnusedParameters --noImplicitThis ace.d.ts
     - run: npm run typecheck
     - uses: codecov/codecov-action@v3
diff --git a/package.json b/package.json
index d50651fd8b9..8a1a040f01d 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
         "lint": "eslint \"src/**/*.js\"",
         "fix": "eslint --fix \"src/**/*.js\"",
         "typecheck": "tsc -p tsconfig.json",
+        "update-types": "node ./tool/modes-declaration-generator.js",
         "changelog": "standard-version",
         "prepack": "node tool/esm_resolver_generator.js && node Makefile.dryice.js css --target build-styles && rm -rf styles && mv build-styles/css styles"
     },
diff --git a/src/keyboard/hash_handler.js b/src/keyboard/hash_handler.js
index d445f5f2924..07e9d61a250 100644
--- a/src/keyboard/hash_handler.js
+++ b/src/keyboard/hash_handler.js
@@ -297,4 +297,4 @@ MultiHashHandler.call = function(thisArg, config, platform) {
 };
 
 exports.HashHandler = HashHandler;
-exports.MultiHashHandler = MultiHashHandler;
+exports.MultiHashHandler = MultiHashHandler