diff --git a/package-lock.json b/package-lock.json
index 035769fc..f931a1a4 100644
--- a/package-lock.json
+++ b/package-lock.json
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-                    "dev": true,
-                    "requires": {
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-                        "inflight": "^1.0.4",
-                        "inherits": "2",
-                        "minimatch": "^3.0.4",
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-                    "dev": true,
-                    "requires": {
-                        "has-flag": "^3.0.0"
-                    }
-                }
+                "minimist": "^1.2.5"
             }
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         "ms": {
@@ -660,12 +346,6 @@
             "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
             "dev": true
         },
-        "oauth-sign": {
-            "version": "0.9.0",
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             "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -687,12 +367,6 @@
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-            "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
-            "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
-            "dev": true
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             "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-6.8.8.tgz",
@@ -720,64 +394,6 @@
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-            "resolved": "https://registry.npmjs.org/psl/-/psl-1.4.0.tgz",
-            "integrity": "sha512-HZzqCGPecFLyoRj5HLfuDSKYTJkAfB5thKBIkRHtGjWwY7p1dAyveIbXIq4tO0KYfDF2tHqPUgY9SDnGm00uFw==",
-            "dev": true
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-            "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
-            "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
-            "dev": true
-        },
-        "qs": {
-            "version": "6.5.2",
-            "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
-            "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
-            "dev": true
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-        "querystringify": {
-            "version": "2.1.1",
-            "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.1.1.tgz",
-            "integrity": "sha512-w7fLxIRCRT7U8Qu53jQnJyPkYZIaR4n5151KMfcJlO/A9397Wxb1amJvROTK6TOnp7PfoAmg/qXiNHI+08jRfA==",
-            "dev": true
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-        "request": {
-            "version": "2.88.0",
-            "resolved": "https://registry.npmjs.org/request/-/request-2.88.0.tgz",
-            "integrity": "sha512-NAqBSrijGLZdM0WZNsInLJpkJokL72XYjUpnB0iwsRgxh7dB6COrHnTBNwN0E+lHDAJzu7kLAkDeY08z2/A0hg==",
-            "dev": true,
-            "requires": {
-                "aws-sign2": "~0.7.0",
-                "aws4": "^1.8.0",
-                "caseless": "~0.12.0",
-                "combined-stream": "~1.0.6",
-                "extend": "~3.0.2",
-                "forever-agent": "~0.6.1",
-                "form-data": "~2.3.2",
-                "har-validator": "~5.1.0",
-                "http-signature": "~1.2.0",
-                "is-typedarray": "~1.0.0",
-                "isstream": "~0.1.2",
-                "json-stringify-safe": "~5.0.1",
-                "mime-types": "~2.1.19",
-                "oauth-sign": "~0.9.0",
-                "performance-now": "^2.1.0",
-                "qs": "~6.5.2",
-                "safe-buffer": "^5.1.2",
-                "tough-cookie": "~2.4.3",
-                "tunnel-agent": "^0.6.0",
-                "uuid": "^3.3.2"
-            }
-        },
-        "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": "1.12.0",
             "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.12.0.tgz",
@@ -787,17 +403,14 @@
                 "path-parse": "^1.0.6"
             }
         },
-        "safe-buffer": {
-            "version": "5.2.0",
-            "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
-            "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
-            "dev": true
-        },
-        "safer-buffer": {
-            "version": "2.1.2",
-            "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-            "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-            "dev": true
+        "rimraf": {
+            "version": "2.7.1",
+            "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
+            "integrity": "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==",
+            "dev": true,
+            "requires": {
+                "glob": "^7.1.3"
+            }
         },
         "semver": {
             "version": "5.7.1",
@@ -805,45 +418,12 @@
             "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
             "dev": true
         },
-        "source-map": {
-            "version": "0.6.1",
-            "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-            "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-            "dev": true
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-        "source-map-support": {
-            "version": "0.5.13",
-            "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.13.tgz",
-            "integrity": "sha512-SHSKFHadjVA5oR4PPqhtAVdcBWwRYVd6g6cAXnIbRiIwc2EhPrTuKUBdSLvlEKyIP3GCf89fltvcZiP9MMFA1w==",
-            "dev": true,
-            "requires": {
-                "buffer-from": "^1.0.0",
-                "source-map": "^0.6.0"
-            }
-        },
         "sprintf-js": {
             "version": "1.0.3",
             "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
             "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
             "dev": true
         },
-        "sshpk": {
-            "version": "1.16.1",
-            "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
-            "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
-            "dev": true,
-            "requires": {
-                "asn1": "~0.2.3",
-                "assert-plus": "^1.0.0",
-                "bcrypt-pbkdf": "^1.0.0",
-                "dashdash": "^1.12.0",
-                "ecc-jsbn": "~0.1.1",
-                "getpass": "^0.1.1",
-                "jsbn": "~0.1.0",
-                "safer-buffer": "^2.0.2",
-                "tweetnacl": "~0.14.0"
-            }
-        },
         "supports-color": {
             "version": "5.5.0",
             "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -853,24 +433,6 @@
                 "has-flag": "^3.0.0"
             }
         },
-        "tough-cookie": {
-            "version": "2.4.3",
-            "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
-            "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
-            "dev": true,
-            "requires": {
-                "psl": "^1.1.24",
-                "punycode": "^1.4.1"
-            },
-            "dependencies": {
-                "punycode": {
-                    "version": "1.4.1",
-                    "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-                    "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
-                    "dev": true
-                }
-            }
-        },
         "tslib": {
             "version": "1.10.0",
             "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -907,78 +469,12 @@
                 "tslib": "^1.8.1"
             }
         },
-        "tunnel-agent": {
-            "version": "0.6.0",
-            "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-            "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-            "dev": true,
-            "requires": {
-                "safe-buffer": "^5.0.1"
-            }
-        },
-        "tweetnacl": {
-            "version": "0.14.5",
-            "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-            "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-            "dev": true
-        },
         "typescript": {
             "version": "3.7.2",
             "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.2.tgz",
             "integrity": "sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==",
             "dev": true
         },
-        "uri-js": {
-            "version": "4.2.2",
-            "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-            "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
-            "dev": true,
-            "requires": {
-                "punycode": "^2.1.0"
-            }
-        },
-        "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"
-            }
-        },
-        "uuid": {
-            "version": "3.3.3",
-            "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
-            "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
-            "dev": true
-        },
-        "verror": {
-            "version": "1.10.0",
-            "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-            "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-            "dev": true,
-            "requires": {
-                "assert-plus": "^1.0.0",
-                "core-util-is": "1.0.2",
-                "extsprintf": "^1.2.0"
-            }
-        },
-        "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-debugadapter": {
             "version": "1.37.1",
             "resolved": "https://registry.npmjs.org/vscode-debugadapter/-/vscode-debugadapter-1.37.1.tgz",
@@ -994,13 +490,14 @@
             "integrity": "sha512-ppZLEBbFRVNsK0YpfgFi/x2CDyihx0F+UpdKmgeJcvi05UgSXYdO0n9sDVYwoGvvYQPvlpDQeWuY0nloOC4mPA=="
         },
         "vscode-test": {
-            "version": "0.4.3",
-            "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-0.4.3.tgz",
-            "integrity": "sha512-EkMGqBSefZH2MgW65nY05rdRSko15uvzq4VAPM5jVmwYuFQKE7eikKXNJDRxL+OITXHB6pI+a3XqqD32Y3KC5w==",
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-1.3.0.tgz",
+            "integrity": "sha512-LddukcBiSU2FVTDr3c1D8lwkiOvwlJdDL2hqVbn6gIz+rpTqUCkMZSKYm94Y1v0WXlHSDQBsXyY+tchWQgGVsw==",
             "dev": true,
             "requires": {
                 "http-proxy-agent": "^2.1.0",
-                "https-proxy-agent": "^2.2.1"
+                "https-proxy-agent": "^2.2.4",
+                "rimraf": "^2.6.3"
             }
         },
         "which": {
diff --git a/package.json b/package.json
index 5bc1ee85..f9fc2a7a 100644
--- a/package.json
+++ b/package.json
@@ -357,15 +357,15 @@
     "scripts": {
         "check-lint": "tslint -t stylish 'src/**/*.ts' --exclude 'src/**/*.d.ts'",
         "compile": "./scripts/build.sh",
-        "postinstall": "node ./node_modules/vscode/bin/install",
         "vscode:prepublish": "./scripts/build.sh",
         "watch": "./scripts/build.sh -watch"
     },
     "devDependencies": {
         "@types/node": "^6.14.9",
+        "@types/vscode": "^1.30.0",
         "tslint": "^5.20.1",
         "typescript": "^3.7.2",
-        "vscode": "^1.1.36"
+        "vscode-test": "^1.3.0"
     },
     "dependencies": {
         "protobufjs": "^6.8.0",
diff --git a/src/workspace-tree/bazel_workspace_tree_provider.ts b/src/workspace-tree/bazel_workspace_tree_provider.ts
index 889b544d..1c89deb7 100644
--- a/src/workspace-tree/bazel_workspace_tree_provider.ts
+++ b/src/workspace-tree/bazel_workspace_tree_provider.ts
@@ -23,11 +23,11 @@ import { BazelWorkspaceFolderTreeItem } from "./bazel_workspace_folder_tree_item
  */
 export class BazelWorkspaceTreeProvider
   implements vscode.TreeDataProvider<IBazelTreeItem> {
-  public onDidChangeTreeData: vscode.Event<IBazelTreeItem | undefined>;
+  public onDidChangeTreeData: vscode.Event<IBazelTreeItem | void>;
 
   /** Fired when BUILD files change in the workspace. */
   private onDidChangeTreeDataEmitter = new vscode.EventEmitter<
-    IBazelTreeItem | undefined
+    IBazelTreeItem | void
   >();
 
   /** The cached toplevel items. */