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

package.json

@@ -132,7 +132,7 @@
     "ts-loader": "^3.5.0",
     "ts-node": "^8.0.3",
     "tslint": "^5.12.0",
-    "typescript": "^3.1.6",
+    "typescript": "^3.5.0",
     "url-search-params-polyfill": "^6.0.0",
     "useragent": "^2.3.0",
     "verror": "^1.10.0",

packages/mdc-checkbox/component.ts

@@ -81,7 +81,7 @@ export class MDCCheckbox extends MDCComponent<MDCCheckboxFoundation> implements
   }
 
   // Public visibility for this property is required by MDCRippleCapableSurface.
-  root_!: Element; // assigned in MDCComponent constructor
+  root_!: HTMLElement; // assigned in MDCComponent constructor
 
   private readonly ripple_: MDCRipple = this.createRipple_();
   private handleChange_!: EventListener; // assigned in initialSyncWithDOM()

packages/mdc-form-field/adapter.ts

@@ -21,7 +21,7 @@
  * THE SOFTWARE.
  */
 
-import {EventType, SpecificEventListener} from '@material/base/types';
+import {SpecificEventListener} from '@material/base/types';
 
 /**
  * Defines the shape of the adapter expected by the foundation.
@@ -33,6 +33,6 @@ import {EventType, SpecificEventListener} from '@material/base/types';
 export interface MDCFormFieldAdapter {
   activateInputRipple(): void;
   deactivateInputRipple(): void;
-  deregisterInteractionHandler<K extends EventType>(evtType: K, handler: SpecificEventListener<K>): void;
-  registerInteractionHandler<K extends EventType>(evtType: K, handler: SpecificEventListener<K>): void;
+  deregisterInteractionHandler(evtType: 'click', handler: SpecificEventListener<'click'>): void;
+  registerInteractionHandler(evtType: 'click', handler: SpecificEventListener<'click'>): void;
 }

packages/mdc-form-field/component.ts

@@ -45,7 +45,7 @@ export class MDCFormField extends MDCComponent<MDCFormFieldFoundation> {
     return this.input_;
   }
 
-  private get label_(): Element | null {
+  private get label_(): HTMLElement | null {
     const {LABEL_SELECTOR} = MDCFormFieldFoundation.strings;
     return this.root_.querySelector(LABEL_SELECTOR);
   }

packages/mdc-radio/component.ts

@@ -64,7 +64,7 @@ export class MDCRadio extends MDCComponent<MDCRadioFoundation> implements MDCRip
   }
 
   // Public visibility for this property is required by MDCRippleCapableSurface.
-  root_!: Element; // assigned in MDCComponent constructor
+  root_!: HTMLElement; // assigned in MDCComponent constructor
 
   private readonly ripple_: MDCRipple = this.createRipple_();
 

packages/mdc-ripple/component.ts

@@ -67,7 +67,7 @@ export class MDCRipple extends MDCComponent<MDCRippleFoundation> implements MDCR
   }
 
   // Public visibility for this property is required by MDCRippleCapableSurface.
-  root_!: Element; // assigned in MDCComponent constructor
+  root_!: HTMLElement; // assigned in MDCComponent constructor
 
   disabled = false;
 

packages/mdc-ripple/types.ts

@@ -40,7 +40,7 @@ export interface MDCRippleAttachOpts {
  * disabled Whether or not the ripple is attached to a disabled component.
  */
 export interface MDCRippleCapableSurface {
-  readonly root_: Element;
+  readonly root_: HTMLElement;
   unbounded?: boolean;
   disabled?: boolean;
 }

packages/mdc-switch/component.ts

@@ -38,7 +38,7 @@ export class MDCSwitch extends MDCComponent<MDCSwitchFoundation> implements MDCR
   }
 
   // Public visibility for this property is required by MDCRippleCapableSurface.
-  root_!: Element; // assigned in MDCComponent constructor
+  root_!: HTMLElement; // assigned in MDCComponent constructor
 
   private readonly ripple_ = this.createRipple_();
 

packages/mdc-top-app-bar/component.ts

@@ -35,7 +35,7 @@ export class MDCTopAppBar extends MDCComponent<MDCTopAppBarBaseFoundation> {
     return new MDCTopAppBar(root);
   }
 
-  private navIcon_!: Element | null;
+  private navIcon_!: HTMLElement | null;
   private iconRipples_!: MDCRipple[];
   private scrollTarget_!: EventTarget;