diff --git a/examples/example-datagrid/package.json b/examples/example-datagrid/package.json
index 2984409aa..9d049f545 100644
--- a/examples/example-datagrid/package.json
+++ b/examples/example-datagrid/package.json
@@ -18,7 +18,7 @@
     "file-loader": "^0.11.1",
     "rimraf": "^2.5.2",
     "style-loader": "^0.13.1",
-    "typescript": "~3.0.3",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   }
 }
diff --git a/examples/example-datagrid/tsconfig.json b/examples/example-datagrid/tsconfig.json
index a3ba6ecf4..7eafd685f 100644
--- a/examples/example-datagrid/tsconfig.json
+++ b/examples/example-datagrid/tsconfig.json
@@ -9,7 +9,7 @@
     "moduleResolution": "node",
     "target": "ES5",
     "outDir": "./build",
-    "lib": ["ES5", "ES2015.Promise", "DOM"],
+    "lib": ["ES5", "ES2015.Promise", "ES2015.Iterable", "DOM"],
     "types": []
   },
   "include": ["src/*"]
diff --git a/examples/example-datastore/package.json b/examples/example-datastore/package.json
index 88df8c8f2..aa5d3d7d5 100644
--- a/examples/example-datastore/package.json
+++ b/examples/example-datastore/package.json
@@ -19,7 +19,7 @@
     "file-loader": "^0.11.1",
     "rimraf": "^2.5.2",
     "style-loader": "^0.13.1",
-    "typescript": "~3.3.1",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "scripts": {
diff --git a/examples/example-datastore/src/index.ts b/examples/example-datastore/src/index.ts
index c833f3a0f..e1fc33a95 100644
--- a/examples/example-datastore/src/index.ts
+++ b/examples/example-datastore/src/index.ts
@@ -88,7 +88,7 @@ async function init(): Promise<void> {
   commands.addCommand('undo', {
     label: 'Undo',
     execute: () => {
-      let editor = ArrayExt.findFirstValue([e1, e2, e3], e => e.hasFocus());
+      let editor = ArrayExt.findFirstValue([e1, e2, e3], (e: CodeMirrorEditor) => e.hasFocus());
       if (editor) {
         editor.undo();
       }
@@ -97,7 +97,7 @@ async function init(): Promise<void> {
   commands.addCommand('redo', {
     label: 'Redo',
     execute: () => {
-      let editor = ArrayExt.findFirstValue([e1, e2, e3], e => e.hasFocus());
+      let editor = ArrayExt.findFirstValue([e1, e2, e3], (e: CodeMirrorEditor) => e.hasFocus());
       if (editor) {
         editor.redo();
       }
diff --git a/examples/example-datastore/tsconfig.json b/examples/example-datastore/tsconfig.json
index cc16c11c6..fcefba0c5 100644
--- a/examples/example-datastore/tsconfig.json
+++ b/examples/example-datastore/tsconfig.json
@@ -9,7 +9,7 @@
     "moduleResolution": "node",
     "target": "ES5",
     "outDir": "./build",
-    "lib": ["ES5", "es2015.collection", "DOM", "ES2015.Promise"],
+    "lib": ["ES5", "es2015.collection", "DOM", "ES2015.Promise","ES2015.Iterable"],
     "types": []
   },
   "include": ["src/*"]
diff --git a/examples/example-dockpanel/package.json b/examples/example-dockpanel/package.json
index 4f7a8489d..490464928 100644
--- a/examples/example-dockpanel/package.json
+++ b/examples/example-dockpanel/package.json
@@ -19,7 +19,7 @@
     "file-loader": "^0.11.1",
     "rimraf": "^2.5.2",
     "style-loader": "^0.13.1",
-    "typescript": "~3.0.3",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   }
 }
diff --git a/examples/example-dockpanel/tsconfig.json b/examples/example-dockpanel/tsconfig.json
index a3ba6ecf4..7eafd685f 100644
--- a/examples/example-dockpanel/tsconfig.json
+++ b/examples/example-dockpanel/tsconfig.json
@@ -9,7 +9,7 @@
     "moduleResolution": "node",
     "target": "ES5",
     "outDir": "./build",
-    "lib": ["ES5", "ES2015.Promise", "DOM"],
+    "lib": ["ES5", "ES2015.Promise", "ES2015.Iterable", "DOM"],
     "types": []
   },
   "include": ["src/*"]
diff --git a/packages/algorithm/package.json b/packages/algorithm/package.json
index 6d7bba2fe..8e586bc65 100644
--- a/packages/algorithm/package.json
+++ b/packages/algorithm/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -52,8 +52,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/algorithm/tsconfig.json b/packages/algorithm/tsconfig.json
index 6d4e85af6..7c5ea9240 100644
--- a/packages/algorithm/tsconfig.json
+++ b/packages/algorithm/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "ES2015.Collection"
+      "ES2015.Collection",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/application/package.json b/packages/application/package.json
index 8e14363fe..10f772d8f 100644
--- a/packages/application/package.json
+++ b/packages/application/package.json
@@ -57,8 +57,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/application/tsconfig.json b/packages/application/tsconfig.json
index 54a7f0611..3cbb0c0de 100644
--- a/packages/application/tsconfig.json
+++ b/packages/application/tsconfig.json
@@ -14,6 +14,7 @@
       "ES5",
       "ES2015.Collection",
       "ES2015.Promise",
+      "ES2015.Iterable",
       "DOM"
     ],
     "types": [],
diff --git a/packages/collections/package.json b/packages/collections/package.json
index 7dada3551..5af5400ba 100644
--- a/packages/collections/package.json
+++ b/packages/collections/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -56,8 +56,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/commands/package.json b/packages/commands/package.json
index dbd66ef7b..54b6edae8 100644
--- a/packages/commands/package.json
+++ b/packages/commands/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -63,8 +63,8 @@
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
     "simulate-event": "^1.4.0",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/commands/src/index.ts b/packages/commands/src/index.ts
index fe3f84394..b1d8d76a9 100644
--- a/packages/commands/src/index.ts
+++ b/packages/commands/src/index.ts
@@ -1333,7 +1333,7 @@ namespace Private {
       return dfault;
     }
     if (typeof value === 'function') {
-      return value;
+      return value as CommandFunc<T>;
     }
     return () => value;
   }
diff --git a/packages/commands/tests/tsconfig.json b/packages/commands/tests/tsconfig.json
index 6fe9fde73..85246f265 100644
--- a/packages/commands/tests/tsconfig.json
+++ b/packages/commands/tests/tsconfig.json
@@ -12,6 +12,7 @@
     "lib": [
       "ES5",
       "ES2015.Promise",
+      "ES2015.Iterable",
       "DOM"
     ],
     "types": [
diff --git a/packages/commands/tsconfig.json b/packages/commands/tsconfig.json
index b2cb5aba4..4720810f0 100644
--- a/packages/commands/tsconfig.json
+++ b/packages/commands/tsconfig.json
@@ -13,6 +13,7 @@
     "lib": [
       "ES5",
       "ES2015.Promise",
+      "ES2015.Iterable",
       "DOM"
     ],
     "types": [],
diff --git a/packages/coreutils/package.json b/packages/coreutils/package.json
index 681dc6c7e..191a39d47 100644
--- a/packages/coreutils/package.json
+++ b/packages/coreutils/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -54,8 +54,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/coreutils/tests/tsconfig.json b/packages/coreutils/tests/tsconfig.json
index 38b425a42..04afc545d 100644
--- a/packages/coreutils/tests/tsconfig.json
+++ b/packages/coreutils/tests/tsconfig.json
@@ -11,7 +11,8 @@
     "outDir": "build",
     "lib": [
       "ES5",
-      "ES2015.Promise"
+      "ES2015.Promise",
+      "ES2015.Iterable"
     ],
     "types": [
       "chai",
diff --git a/packages/coreutils/tsconfig.json b/packages/coreutils/tsconfig.json
index ad978439f..d01c40258 100644
--- a/packages/coreutils/tsconfig.json
+++ b/packages/coreutils/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "ES2015.Promise"
+      "ES2015.Promise",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/datagrid/package.json b/packages/datagrid/package.json
index f1d4026a7..40b48fb4e 100644
--- a/packages/datagrid/package.json
+++ b/packages/datagrid/package.json
@@ -29,7 +29,7 @@
   "scripts": {
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "docs": "typedoc --options tdoptions.json src",
     "watch": "tsc --build --watch"
   },
@@ -45,8 +45,8 @@
   },
   "devDependencies": {
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3"
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/datagrid/src/cellrenderer.ts b/packages/datagrid/src/cellrenderer.ts
index 78abcdbf7..e4638846f 100644
--- a/packages/datagrid/src/cellrenderer.ts
+++ b/packages/datagrid/src/cellrenderer.ts
@@ -133,6 +133,6 @@ namespace CellRenderer {
    */
   export
   function resolveOption<T>(option: ConfigOption<T>, config: CellConfig): T {
-    return typeof option === 'function' ? option(config) : option;
+    return typeof option === 'function' ? (option as ConfigFunc<T>)(config) : option;
   }
 }
diff --git a/packages/datagrid/src/graphicscontext.ts b/packages/datagrid/src/graphicscontext.ts
index 82eb80170..1c9542434 100644
--- a/packages/datagrid/src/graphicscontext.ts
+++ b/packages/datagrid/src/graphicscontext.ts
@@ -94,33 +94,33 @@ class GraphicsContext implements IDisposable {
     }
   }
 
-  get textAlign(): string {
+  get textAlign(): CanvasTextAlign {
     return this._context.textAlign;
   }
 
-  set textAlign(value: string) {
+  set textAlign(value: CanvasTextAlign) {
     if (this._state.textAlign !== value) {
       this._state.textAlign = value;
       this._context.textAlign = value;
     }
   }
 
-  get textBaseline(): string {
+  get textBaseline(): CanvasTextBaseline {
     return this._context.textBaseline;
   }
 
-  set textBaseline(value: string) {
+  set textBaseline(value: CanvasTextBaseline) {
     if (this._state.textBaseline !== value) {
       this._state.textBaseline = value;
       this._context.textBaseline = value;
     }
   }
 
-  get lineCap(): string {
+  get lineCap(): CanvasLineCap {
     return this._context.lineCap;
   }
 
-  set lineCap(value: string) {
+  set lineCap(value: CanvasLineCap) {
     if (this._state.lineCap !== value) {
       this._state.lineCap = value;
       this._context.lineCap = value;
@@ -138,11 +138,11 @@ class GraphicsContext implements IDisposable {
     }
   }
 
-  get lineJoin(): string {
+  get lineJoin(): CanvasLineJoin {
     return this._context.lineJoin;
   }
 
-  set lineJoin(value: string) {
+  set lineJoin(value: CanvasLineJoin) {
     if (this._state.lineJoin !== value) {
       this._state.lineJoin = value;
       this._context.lineJoin = value;
@@ -415,7 +415,7 @@ class GraphicsContext implements IDisposable {
     return this._context.createRadialGradient(x0, y0, r0, x1, y1, r1);
   }
 
-  createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern {
+  createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern | null {
     return this._context.createPattern(image, repetition);
   }
 
diff --git a/packages/datagrid/tsconfig.json b/packages/datagrid/tsconfig.json
index 7d06928c3..69f77ad0d 100644
--- a/packages/datagrid/tsconfig.json
+++ b/packages/datagrid/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "DOM"
+      "DOM",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/datastore/package.json b/packages/datastore/package.json
index c6ac2ddea..44e522858 100644
--- a/packages/datastore/package.json
+++ b/packages/datastore/package.json
@@ -31,7 +31,7 @@
   "scripts": {
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
     "test:chrome": "cd tests && karma start --browsers=Chrome",
@@ -51,7 +51,7 @@
   "devDependencies": {
     "rimraf": "^2.5.2",
     "typedoc": "~0.15.0",
-    "typescript": "~3.5.1"
+    "typescript": "~3.6.4"
   },
   "publishConfig": {
     "access": "public"
diff --git a/packages/datastore/tests/package.json b/packages/datastore/tests/package.json
index 6cb6feede..d85cb38e7 100644
--- a/packages/datastore/tests/package.json
+++ b/packages/datastore/tests/package.json
@@ -22,7 +22,7 @@
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.2",
     "rimraf": "^2.5.2",
-    "typescript": "~3.0.3",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "scripts": {
diff --git a/packages/disposable/package.json b/packages/disposable/package.json
index bfc3038ba..8731b90ec 100644
--- a/packages/disposable/package.json
+++ b/packages/disposable/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -57,8 +57,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/disposable/tsconfig.json b/packages/disposable/tsconfig.json
index 12f43688d..2c5474153 100644
--- a/packages/disposable/tsconfig.json
+++ b/packages/disposable/tsconfig.json
@@ -13,7 +13,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "ES2015.Collection"
+      "ES2015.Collection",
+      "ES2015.Iterable"
     ],
     "types": []
   },
diff --git a/packages/domutils/package.json b/packages/domutils/package.json
index e0ad7eea3..499f453b9 100644
--- a/packages/domutils/package.json
+++ b/packages/domutils/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -53,8 +53,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/domutils/src/selector.ts b/packages/domutils/src/selector.ts
index 808a9f25e..a06f024e3 100644
--- a/packages/domutils/src/selector.ts
+++ b/packages/domutils/src/selector.ts
@@ -136,7 +136,7 @@ namespace Private {
       proto.webkitMatchesSelector ||
       (function(selector: string) {
         let elem = this as Element;
-        let matches = elem.ownerDocument.querySelectorAll(selector);
+        let matches = elem.ownerDocument ? elem.ownerDocument.querySelectorAll(selector) : [];
         return Array.prototype.indexOf.call(matches, elem) !== -1;
       })
     );
diff --git a/packages/domutils/tsconfig.json b/packages/domutils/tsconfig.json
index 5867b5c72..1320d3826 100644
--- a/packages/domutils/tsconfig.json
+++ b/packages/domutils/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "DOM"
+      "DOM",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/dragdrop/package.json b/packages/dragdrop/package.json
index 2d610ecab..318be05a5 100644
--- a/packages/dragdrop/package.json
+++ b/packages/dragdrop/package.json
@@ -33,7 +33,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -63,8 +63,8 @@
     "rimraf": "^2.5.2",
     "simulate-event": "^1.4.0",
     "style-loader": "^0.13.1",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/dragdrop/tsconfig.json b/packages/dragdrop/tsconfig.json
index 50c58b61b..a32eeb9d4 100644
--- a/packages/dragdrop/tsconfig.json
+++ b/packages/dragdrop/tsconfig.json
@@ -13,6 +13,7 @@
     "lib": [
       "ES5",
       "ES2015.Promise",
+      "ES2015.Iterable",
       "DOM"
     ],
     "types": [],
diff --git a/packages/keyboard/package.json b/packages/keyboard/package.json
index fa17d093e..e3ea4c836 100644
--- a/packages/keyboard/package.json
+++ b/packages/keyboard/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -54,8 +54,8 @@
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
     "simulate-event": "^1.4.0",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/keyboard/tsconfig.json b/packages/keyboard/tsconfig.json
index 22727c0fa..170133b4d 100644
--- a/packages/keyboard/tsconfig.json
+++ b/packages/keyboard/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "DOM"
+      "DOM",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/messaging/package.json b/packages/messaging/package.json
index d86afb1bf..b16fb6e12 100644
--- a/packages/messaging/package.json
+++ b/packages/messaging/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -57,8 +57,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/messaging/src/index.ts b/packages/messaging/src/index.ts
index f9588692e..4b50771c7 100644
--- a/packages/messaging/src/index.ts
+++ b/packages/messaging/src/index.ts
@@ -494,6 +494,7 @@ namespace MessageLoop {
    */
   const schedule = (() => {
     let ok = typeof requestAnimationFrame === 'function';
+    // @ts-ignore setImmediate is valid for NodeJS
     return ok ? requestAnimationFrame : setImmediate;
   })();
 
@@ -502,6 +503,7 @@ namespace MessageLoop {
    */
   const unschedule = (() => {
     let ok = typeof cancelAnimationFrame === 'function';
+    // @ts-ignore clearImmediate is valid for NodeJS
     return ok ? cancelAnimationFrame : clearImmediate;
   })();
 
diff --git a/packages/messaging/tests/src/index.spec.ts b/packages/messaging/tests/src/index.spec.ts
index 3bab33fc4..dd784afc9 100644
--- a/packages/messaging/tests/src/index.spec.ts
+++ b/packages/messaging/tests/src/index.spec.ts
@@ -64,6 +64,7 @@ class LogHook implements IMessageHook {
 
 const defer = (() => {
   let ok = typeof requestAnimationFrame === 'function';
+  // @ts-ignore setImmediate is valid for NodeJS
   return ok ? requestAnimationFrame : setImmediate;
 })();
 
diff --git a/packages/polling/tests/tsconfig.json b/packages/polling/tests/tsconfig.json
index 9d29a1db4..cae7d4871 100644
--- a/packages/polling/tests/tsconfig.json
+++ b/packages/polling/tests/tsconfig.json
@@ -13,7 +13,8 @@
     "lib": [
       "DOM",
       "ES5",
-      "ES2015.Promise"
+      "ES2015.Promise",
+      "ES2015.Iterable"
     ],
     "types": [
       "chai",
diff --git a/packages/polling/tsconfig.json b/packages/polling/tsconfig.json
index 4b07c641e..598ee705e 100644
--- a/packages/polling/tsconfig.json
+++ b/packages/polling/tsconfig.json
@@ -13,7 +13,8 @@
     "lib": [
       "DOM",
       "ES5",
-      "ES2015.Promise"
+      "ES2015.Promise",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/properties/package.json b/packages/properties/package.json
index 77a47d046..ee1fde9dd 100644
--- a/packages/properties/package.json
+++ b/packages/properties/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -53,8 +53,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/properties/tsconfig.json b/packages/properties/tsconfig.json
index 6d4e85af6..7c5ea9240 100644
--- a/packages/properties/tsconfig.json
+++ b/packages/properties/tsconfig.json
@@ -12,7 +12,8 @@
     "outDir": "lib",
     "lib": [
       "ES5",
-      "ES2015.Collection"
+      "ES2015.Collection",
+      "ES2015.Iterable"
     ],
     "types": [],
     "rootDir": "src"
diff --git a/packages/signaling/package.json b/packages/signaling/package.json
index 56800b205..a7e871810 100644
--- a/packages/signaling/package.json
+++ b/packages/signaling/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -56,8 +56,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/virtualdom/package.json b/packages/virtualdom/package.json
index 3a6e3d4d6..70b4340f3 100644
--- a/packages/virtualdom/package.json
+++ b/packages/virtualdom/package.json
@@ -31,7 +31,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -56,8 +56,8 @@
     "karma-mocha-reporter": "^2.2.2",
     "mocha": "^3.2.0",
     "rimraf": "^2.5.2",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/widgets/package.json b/packages/widgets/package.json
index cfa883644..989408679 100644
--- a/packages/widgets/package.json
+++ b/packages/widgets/package.json
@@ -33,7 +33,7 @@
     "api": "api-extractor run --local --verbose",
     "build": "tsc --build",
     "build:test": "tsc --build tests && cd tests && webpack",
-    "clean": "rimraf lib",
+    "clean": "rimraf lib && rimraf *.tsbuildinfo",
     "clean:test": "rimraf tests/build",
     "docs": "typedoc --options tdoptions.json src",
     "test": "npm run test:firefox",
@@ -72,8 +72,8 @@
     "rimraf": "^2.5.2",
     "simulate-event": "^1.4.0",
     "style-loader": "^0.13.1",
-    "typedoc": "~0.12.0",
-    "typescript": "~3.0.3",
+    "typedoc": "~0.15.0",
+    "typescript": "~3.6.4",
     "webpack": "^2.2.1"
   },
   "publishConfig": {
diff --git a/packages/widgets/tests/src/commandpalette.spec.ts b/packages/widgets/tests/src/commandpalette.spec.ts
index 515dd55aa..0056c7ce5 100644
--- a/packages/widgets/tests/src/commandpalette.spec.ts
+++ b/packages/widgets/tests/src/commandpalette.spec.ts
@@ -461,6 +461,7 @@ describe('@lumino/widgets', () => {
             node = content.querySelector('.p-CommandPalette-item.p-mod-active');
             expect(node).to.equal(null);
           });
+          expect(called).to.be.false;
         });
 
         it('should trigger active item if enter is pressed', () => {
diff --git a/packages/widgets/tsconfig.json b/packages/widgets/tsconfig.json
index 0f25c3b4a..8ba02bb1e 100644
--- a/packages/widgets/tsconfig.json
+++ b/packages/widgets/tsconfig.json
@@ -14,6 +14,7 @@
       "ES5",
       "ES2015.Collection",
       "ES2015.Promise",
+      "ES2015.Iterable",
       "DOM"
     ],
     "types": [],
diff --git a/yarn.lock b/yarn.lock
index 8feb41d11..d2036cad8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6923,7 +6923,7 @@ typescript@3.0.x, typescript@~3.0.3:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
 
-typescript@3.5.x, typescript@~3.5.1:
+typescript@3.5.x:
   version "3.5.3"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.3.tgz#c830f657f93f1ea846819e929092f5fe5983e977"
   integrity sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==
@@ -6932,10 +6932,10 @@ typescript@~2.9.2:
   version "2.9.2"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.2.tgz#1cbf61d05d6b96269244eb6a3bce4bd914e0f00c"
 
-typescript@~3.3.1:
-  version "3.3.4000"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.3.4000.tgz#76b0f89cfdbf97827e1112d64f283f1151d6adf0"
-  integrity sha512-jjOcCZvpkl2+z7JFn0yBOoLQyLoIkNZAs/fYJkUG6VKy6zLPHJGfQJYFHzibB6GJaF/8QrcECtlQ5cpvRHSMEA==
+typescript@~3.6.4:
+  version "3.6.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.6.4.tgz#b18752bb3792bc1a0281335f7f6ebf1bbfc5b91d"
+  integrity sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==
 
 typescript@~3.7.2:
   version "3.7.2"