diff --git a/default.nix b/default.nix
index 0814ba17..c8b7d182 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,9 @@
 { pkgs ? import <nixpkgs> {} }:
 with pkgs;
-pkgs.mkYarnPackage {
-  name = "vscode-haskell";
+
+# Please run `yarn import` first to generate yarn.lock!
+pkgs.mkYarnPackage rec {
+  name = "haskell";
   src = ./.;
   packageJSON = ./package.json;
   yarnLock = ./yarn.lock;
@@ -9,7 +11,7 @@ pkgs.mkYarnPackage {
   installPhase = ''
     mkdir -p "$out/dist"
     yarn vscode:prepublish --output-path "$out/dist"
-    mv deps/vscode-haskell/{package.json,hie-vscode.sh,hie-vscode.bat} "$out"
+    mv deps/${name}/package.json "$out"
   '';
 
   distPhase = ''
diff --git a/package-lock.json b/package-lock.json
index 7b4ba3c3..6cec921e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -116,6 +116,12 @@
       "integrity": "sha512-SCcK7mvGi3+ZNz833RRjFIxrn4gI1PPR3NtuIS+6vMkvmsGjosqTJwRt5bAEFLRz+wtJMWv8+uOnZf2hi2QXTg==",
       "dev": true
     },
+    "@types/vscode": {
+      "version": "1.48.0",
+      "resolved": "https://registry.npmjs.org/@types/vscode/-/vscode-1.48.0.tgz",
+      "integrity": "sha512-sZJKzsJz1gSoFXcOJWw3fnKl2sseUgZmvB4AJZS+Fea+bC/jfGPVhmFL/FfQHld/TKtukVONsmoD3Pkyx9iadg==",
+      "dev": true
+    },
     "@types/yauzl": {
       "version": "2.9.1",
       "resolved": "https://registry.npmjs.org/@types/yauzl/-/yauzl-2.9.1.tgz",
@@ -318,15 +324,6 @@
       "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
-    "agent-base": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
-      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
-      "dev": true,
-      "requires": {
-        "es6-promisify": "^5.0.0"
-      }
-    },
     "ajv": {
       "version": "6.12.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.0.tgz",
@@ -768,12 +765,6 @@
       "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
       "dev": true
     },
-    "browser-stdout": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
-      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
-      "dev": true
-    },
     "browserify-aes": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
@@ -1420,15 +1411,6 @@
         "assert-plus": "^1.0.0"
       }
     },
-    "debug": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-      "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
-      "dev": true,
-      "requires": {
-        "ms": "2.0.0"
-      }
-    },
     "decamelize": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
@@ -1680,21 +1662,6 @@
         "is-arrayish": "^0.2.1"
       }
     },
-    "es6-promise": {
-      "version": "4.2.8",
-      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
-      "integrity": "sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==",
-      "dev": true
-    },
-    "es6-promisify": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
-      "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
-      "dev": true,
-      "requires": {
-        "es6-promise": "^4.0.3"
-      }
-    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -2986,12 +2953,6 @@
       "integrity": "sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==",
       "dev": true
     },
-    "growl": {
-      "version": "1.10.5",
-      "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.5.tgz",
-      "integrity": "sha512-qBr4OuELkhPenW6goKVXiv47US3clb3/IbuWF9KNKEijAy9oeHxU9IgzjvJhHkUzhaj7rOUD7+YGWqUjLp5oSA==",
-      "dev": true
-    },
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
@@ -3084,12 +3045,6 @@
         "minimalistic-assert": "^1.0.1"
       }
     },
-    "he": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
-      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
-      "dev": true
-    },
     "hmac-drbg": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/hmac-drbg/-/hmac-drbg-1.0.1.tgz",
@@ -3123,16 +3078,6 @@
         "readable-stream": "^3.1.1"
       }
     },
-    "http-proxy-agent": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-2.1.0.tgz",
-      "integrity": "sha512-qwHbBLV7WviBl0rQsOzH6o5lwyOIvwp/BdFnvVxXORldu5TmjFfjzBcWUWS5kWAZhmv+JtiDhSuQCp4sBfbIgg==",
-      "dev": true,
-      "requires": {
-        "agent-base": "4",
-        "debug": "3.1.0"
-      }
-    },
     "http-signature": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
@@ -3149,16 +3094,6 @@
       "integrity": "sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM=",
       "dev": true
     },
-    "https-proxy-agent": {
-      "version": "2.2.4",
-      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-2.2.4.tgz",
-      "integrity": "sha512-OmvfoQ53WLjtA9HeYP9RNrWMJzzAz1JGaSFr1nijg0PVR1JaD/xbJq1mdEIIlxGpXp9eSe/O2LgU9DJmTPd0Eg==",
-      "dev": true,
-      "requires": {
-        "agent-base": "^4.3.0",
-        "debug": "^3.1.0"
-      }
-    },
     "husky": {
       "version": "4.2.5",
       "resolved": "https://registry.npmjs.org/husky/-/husky-4.2.5.tgz",
@@ -3907,77 +3842,6 @@
         "minimist": "^1.2.5"
       }
     },
-    "mocha": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.2.0.tgz",
-      "integrity": "sha512-2IUgKDhc3J7Uug+FxMXuqIyYzH7gJjXECKe/w43IGgQHTSj3InJi+yAA7T24L9bQMRKiUEHxEX37G5JpVUGLcQ==",
-      "dev": true,
-      "requires": {
-        "browser-stdout": "1.3.1",
-        "commander": "2.15.1",
-        "debug": "3.1.0",
-        "diff": "3.5.0",
-        "escape-string-regexp": "1.0.5",
-        "glob": "7.1.2",
-        "growl": "1.10.5",
-        "he": "1.1.1",
-        "minimatch": "3.0.4",
-        "mkdirp": "0.5.1",
-        "supports-color": "5.4.0"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.15.1",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
-          "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
-          "dev": true
-        },
-        "diff": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-          "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
-          "dev": true
-        },
-        "glob": {
-          "version": "7.1.2",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
-          "dev": true,
-          "requires": {
-            "fs.realpath": "^1.0.0",
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "^3.0.4",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
-        },
-        "minimist": {
-          "version": "0.0.8",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
-          "dev": true
-        },
-        "mkdirp": {
-          "version": "0.5.1",
-          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-          "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
-          "dev": true,
-          "requires": {
-            "minimist": "0.0.8"
-          }
-        },
-        "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^3.0.0"
-          }
-        }
-      }
-    },
     "move-concurrently": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/move-concurrently/-/move-concurrently-1.0.1.tgz",
@@ -4709,12 +4573,6 @@
       "integrity": "sha1-nsYfeQSYdXB9aUFFlv2Qek1xHnM=",
       "dev": true
     },
-    "querystringify": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.1.1.tgz",
-      "integrity": "sha512-w7fLxIRCRT7U8Qu53jQnJyPkYZIaR4n5151KMfcJlO/A9397Wxb1amJvROTK6TOnp7PfoAmg/qXiNHI+08jRfA==",
-      "dev": true
-    },
     "randombytes": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
@@ -4996,12 +4854,6 @@
       "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
       "dev": true
     },
-    "requires-port": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
-      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
-      "dev": true
-    },
     "resolve": {
       "version": "1.15.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.15.0.tgz",
@@ -5952,16 +5804,6 @@
         }
       }
     },
-    "url-parse": {
-      "version": "1.4.7",
-      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.7.tgz",
-      "integrity": "sha512-d3uaVyzDB9tQoSXFvuSUNFibTd9zxd2bkVrDRvF5TmvWWQwqE4lgYJ5m+x1DbecWkw+LK4RNl2CU1hHuOKPVlg==",
-      "dev": true,
-      "requires": {
-        "querystringify": "^2.1.1",
-        "requires-port": "^1.0.0"
-      }
-    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -6017,21 +5859,6 @@
       "integrity": "sha512-2ham8XPWTONajOR0ohOKOHXkm3+gaBmGut3SRuu75xLd/RRaY6vqgh8NBYYk7+RW3u5AtzPQZG8F10LHkl0lAQ==",
       "dev": true
     },
-    "vscode": {
-      "version": "1.1.36",
-      "resolved": "https://registry.npmjs.org/vscode/-/vscode-1.1.36.tgz",
-      "integrity": "sha512-cGFh9jmGLcTapCpPCKvn8aG/j9zVQ+0x5hzYJq5h5YyUXVGa1iamOaB2M2PZXoumQPES4qeAP1FwkI0b6tL4bQ==",
-      "dev": true,
-      "requires": {
-        "glob": "^7.1.2",
-        "mocha": "^5.2.0",
-        "request": "^2.88.0",
-        "semver": "^5.4.1",
-        "source-map-support": "^0.5.0",
-        "url-parse": "^1.4.4",
-        "vscode-test": "^0.4.1"
-      }
-    },
     "vscode-jsonrpc": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-5.0.1.tgz",
@@ -6067,16 +5894,6 @@
       "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.15.1.tgz",
       "integrity": "sha512-+a9MPUQrNGRrGU630OGbYVQ+11iOIovjCkqxajPa9w57Sd5ruK8WQNsslzpa0x/QJqC8kRc2DUxWjIFwoNm4ZQ=="
     },
-    "vscode-test": {
-      "version": "0.4.3",
-      "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-0.4.3.tgz",
-      "integrity": "sha512-EkMGqBSefZH2MgW65nY05rdRSko15uvzq4VAPM5jVmwYuFQKE7eikKXNJDRxL+OITXHB6pI+a3XqqD32Y3KC5w==",
-      "dev": true,
-      "requires": {
-        "http-proxy-agent": "^2.1.0",
-        "https-proxy-agent": "^2.2.1"
-      }
-    },
     "watchpack": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.1.tgz",
diff --git a/package.json b/package.json
index f43a8e01..02795840 100644
--- a/package.json
+++ b/package.json
@@ -171,7 +171,6 @@
     "vscode:prepublish": "webpack --mode production",
     "compile": "webpack --mode none",
     "watch": "webpack --mode none --watch --info-verbosity verbose",
-    "postinstall": "node ./node_modules/vscode/bin/install",
     "tslint": "tslint -p tsconfig.json -c tslint.json --format stylish 'src/**/*.ts'",
     "tslint-fix": "tslint --fix -p tsconfig.json  -c tslint.json --format stylish 'src/**/*.ts'",
     "push-tag": "git tag -a $npm_package_version -m \"Version $npm_package_version\" && git push origin $npm_package_version"
@@ -188,6 +187,7 @@
     "@types/lru-cache": "^4.1.2",
     "@types/node": "^14.0.3",
     "@types/request-promise-native": "^1.0.17",
+    "@types/vscode": "^1.48.0",
     "@types/yauzl": "^2.9.1",
     "husky": "^4.2.5",
     "prettier": "^2.0.5",
@@ -196,7 +196,6 @@
     "tslint": "^5.20.1",
     "tslint-loader": "^3.5.4",
     "typescript": "^3.9.5",
-    "vscode": "^1.1.36",
     "webpack": "^4.42.1",
     "webpack-cli": "^3.3.11"
   },