diff --git a/tools/lsp/README.md b/tools/lsp/README.md
index add4e53d3..afecb5ac8 100644
--- a/tools/lsp/README.md
+++ b/tools/lsp/README.md
@@ -20,8 +20,8 @@ Right now only one parser is linked there; the name of symlink should be changed
 in future.
 
 Server part invokes the TS-parser and then constructs a tree of haskell datatypes
-from the TS-tree. Then it is fed into `AST.Parser` (name will be changed), which
-constructs an universal AST from the tree of the respective language.
+from the TS-tree. Then it is fed into `LIGO.Parser` (name will be changed), which
+constructs an universal LIGO from the tree of the respective language.
 
 Parser uses the root `Parser` module which provides the combinators and monad
 to deal with `ParseTree`, produced from TS output.
diff --git a/tools/lsp/squirrel/.stylish-haskell.yaml b/tools/lsp/squirrel/.stylish-haskell.yaml
new file mode 100644
index 000000000..4ed34c4d9
--- /dev/null
+++ b/tools/lsp/squirrel/.stylish-haskell.yaml
@@ -0,0 +1,66 @@
+# SPDX-FileCopyrightText: 2019 Serokell <https://serokell.io>
+#
+# SPDX-License-Identifier: Unlicense
+
+# Default stylish-haskell config used in Serokell.
+
+steps:
+  - simple_align:
+      cases: false
+      top_level_patterns: false
+      records: false
+  - imports:
+      align: none
+      list_align: after_alias
+      pad_module_names: false
+      long_list_align: new_line
+      empty_list_align: inherit
+      list_padding: 2
+      separate_lists: true
+      space_surround: false
+  - language_pragmas:
+      style: compact
+      remove_redundant: true
+  - trailing_whitespace: {}
+columns: 100
+newline: native
+language_extensions:
+  - BangPatterns
+  - BlockArguments
+  - ConstraintKinds
+  - DataKinds
+  - DefaultSignatures
+  - DeriveAnyClass
+  - DeriveDataTypeable
+  - DeriveGeneric
+  - DerivingStrategies
+  - DerivingVia
+  - EmptyCase
+  - ExistentialQuantification
+  - ExplicitNamespaces
+  - FlexibleContexts
+  - FlexibleInstances
+  - FunctionalDependencies
+  - GADTs
+  - GeneralizedNewtypeDeriving
+  - LambdaCase
+  - MultiParamTypeClasses
+  - MultiWayIf
+  - NamedFieldPuns
+  - NoImplicitPrelude
+  - OverloadedLabels
+  - OverloadedStrings
+  - PatternSynonyms
+  - RebindableSyntax
+  - RecordWildCards
+  - RecursiveDo
+  - ScopedTypeVariables
+  - StandaloneDeriving
+  - TemplateHaskell
+  - TemplateHaskellQuotes
+  - TupleSections
+  - TypeApplications
+  - TypeFamilies
+  - TypeOperators
+  - ViewPatterns
+  - QuasiQuotes
diff --git a/tools/lsp/squirrel/Makefile b/tools/lsp/squirrel/Makefile
new file mode 100644
index 000000000..2c9703b6c
--- /dev/null
+++ b/tools/lsp/squirrel/Makefile
@@ -0,0 +1,30 @@
+SITTER ?= tree-sitter
+
+DIRS := grammar/pascaligo grammar/reasonligo grammar/camligo
+
+PACKAGE := squirrel
+
+STACK_DEV_OPTIONS = --fast --ghc-options -Wwarn --file-watch
+
+.DEFAULT_GOAL := all
+
+all: build
+
+FORCE:
+
+generate: $(DIRS)
+
+$(DIRS): FORCE
+	# $(SITTER) generate # Generation is manual for now
+	mkdir -p $(PACKAGE)/vendor/$@
+	cp $@/src/parser.c vendor/$@/parser.c
+	cp -r $@/src/tree_sitter vendor/$@/tree_sitter
+
+clean:
+	$(RM) vendor/*
+	stack clean
+
+build:
+	stack build $(STACK_DEV_OPTIONS)
+
+.PHONY: all clean generate build FORCE
diff --git a/tools/lsp/squirrel/package.yaml b/tools/lsp/squirrel/package.yaml
index 6ff6e9187..62f14f251 100644
--- a/tools/lsp/squirrel/package.yaml
+++ b/tools/lsp/squirrel/package.yaml
@@ -57,10 +57,12 @@ library:
     - src/
 
   include-dirs:
-    - vendor
+    - vendor/pascaligo
+    - vendor/reasonligo
 
   c-sources:
-    - vendor/parser.c
+    - vendor/pascaligo/parser.c
+    - vendor/reasonligo/parser.c
 
 executables:
   squirrel:
@@ -77,4 +79,6 @@ executables:
     source-dirs:
       - app/
 
-    ghc-options: -threaded
+    ghc-options:
+      - -threaded
+      - -Wall
diff --git a/tools/lsp/squirrel/scripts/check-trailing-whitespace.sh b/tools/lsp/squirrel/scripts/check-trailing-whitespace.sh
new file mode 100755
index 000000000..f62112ccd
--- /dev/null
+++ b/tools/lsp/squirrel/scripts/check-trailing-whitespace.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# SPDX-FileCopyrightText: 2020 Tocqueville Group
+#
+# SPDX-License-Identifier: LicenseRef-MIT-TQ
+
+files=$(git ls-files | xargs grep --files-with-matches --binary-files=without-match '[[:blank:]]$')
+if [[ -n $files ]];then
+  echo '  Files with trailing whitespace found:'
+  for f in "${files[@]}"; do
+    echo "  * $f"
+  done
+  exit 1
+fi