diff --git a/third_party/.gitignore b/third_party/.gitignore
index 2df1369e0e6..6a597b6325c 100644
--- a/third_party/.gitignore
+++ b/third_party/.gitignore
@@ -1,10 +1,10 @@
-# Ignore everything in third_party except for specific
-# directories.
+# Ignore everything in third_party except for specific directories.
 #
 # The forward-slash is necessary to gitignore everything
 # except for specific directories (configured below).
 # See https://git-scm.com/docs/gitignore#_examples
 /*
+
 # Do not ignore the following:
 !.gitignore
 !binaryen
@@ -13,20 +13,19 @@
 !clang.tar.gz.sha1
 !unittest.tar.gz.sha1
 !update.sh
-!/wasmer
-# First exclude pkg from the gitignore, then re-ignore all its
-# contents. See https://github.com/dart-lang/pub/issues/4300
+!fallback_root_certificates
+
+# First exclude pkg from the gitignore, then re-ignore all its contents.
+# See https://github.com/dart-lang/pub/issues/4300.
 !/pkg/
 /pkg/*
-!/pkg/dap
-!/pkg/dap/*
-/pkg/dap/pubspec.lock
-/pkg/dap/.dart_tool
-!/pkg/language_server_protocol
-!/pkg/language_server_protocol/*
-/pkg/language_server_protocol/pubspec.lock
-/pkg/language_server_protocol/.dart_tool
+
 !/pkg/native_assets_builder.status
 !/pkg/native_assets_cli.status
 !/pkg/native_toolchain_c.status
-!fallback_root_certificates
\ No newline at end of file
+
+# These packages are authored in third_party.
+!/pkg/dap
+!/pkg/dap/*
+!/pkg/language_server_protocol
+!/pkg/language_server_protocol/*
diff --git a/third_party/pkg/dap/.gitignore b/third_party/pkg/dap/.gitignore
new file mode 100644
index 00000000000..d19a53a2ff0
--- /dev/null
+++ b/third_party/pkg/dap/.gitignore
@@ -0,0 +1,2 @@
+pubspec.lock
+.dart_tool/
diff --git a/third_party/pkg/language_server_protocol/.gitignore b/third_party/pkg/language_server_protocol/.gitignore
new file mode 100644
index 00000000000..d19a53a2ff0
--- /dev/null
+++ b/third_party/pkg/language_server_protocol/.gitignore
@@ -0,0 +1,2 @@
+pubspec.lock
+.dart_tool/
diff --git a/third_party/pkg/language_server_protocol/analysis_options.yaml b/third_party/pkg/language_server_protocol/analysis_options.yaml
new file mode 100644
index 00000000000..572dd239d09
--- /dev/null
+++ b/third_party/pkg/language_server_protocol/analysis_options.yaml
@@ -0,0 +1 @@
+include: package:lints/recommended.yaml