fix: update TypeScript version to 3.5.x and fix typing errors

package.json

@@ -132,7 +132,7 @@
     "ts-loader": "^6.0.3",
     "ts-node": "^8.0.3",
     "tslint": "^5.12.0",
-    "typescript": "^3.1.6",
+    "typescript": "^3.5.0",
     "uglifyjs-webpack-plugin": "^2.1.3",
     "url-search-params-polyfill": "^6.0.0",
     "useragent": "^2.3.0",

packages/mdc-form-field/component.ts

@@ -66,12 +66,12 @@ export class MDCFormField extends MDCComponent<MDCFormFieldFoundation> {
       },
       deregisterInteractionHandler: (evtType, handler) => {
         if (this.label_) {
-          this.label_.removeEventListener(evtType, handler);
+          (this.label_ as HTMLElement).removeEventListener(evtType, handler);
         }
       },
       registerInteractionHandler: (evtType, handler) => {
         if (this.label_) {
-          this.label_.addEventListener(evtType, handler);
+          (this.label_ as HTMLElement).addEventListener(evtType, handler);
         }
       },
     };

packages/mdc-ripple/component.ts

@@ -50,7 +50,7 @@ export class MDCRipple extends MDCComponent<MDCRippleFoundation> implements MDCR
       deregisterDocumentInteractionHandler: (evtType, handler) =>
           document.documentElement.removeEventListener(evtType, handler, applyPassive()),
       deregisterInteractionHandler: (evtType, handler) =>
-          instance.root_.removeEventListener(evtType, handler, applyPassive()),
+          (instance.root_ as HTMLElement).removeEventListener(evtType, handler, applyPassive()),
       deregisterResizeHandler: (handler) => window.removeEventListener('resize', handler),
       getWindowPageOffset: () => ({x: window.pageXOffset, y: window.pageYOffset}),
       isSurfaceActive: () => matches(instance.root_, ':active'),
@@ -59,7 +59,7 @@ export class MDCRipple extends MDCComponent<MDCRippleFoundation> implements MDCR
       registerDocumentInteractionHandler: (evtType, handler) =>
           document.documentElement.addEventListener(evtType, handler, applyPassive()),
       registerInteractionHandler: (evtType, handler) =>
-          instance.root_.addEventListener(evtType, handler, applyPassive()),
+        (instance.root_ as HTMLElement).addEventListener(evtType, handler, applyPassive()),
       registerResizeHandler: (handler) => window.addEventListener('resize', handler),
       removeClass: (className) => instance.root_.classList.remove(className),
       updateCssVariable: (varName, value) => (instance.root_ as HTMLElement).style.setProperty(varName, value),