fix type of click args

Author: mmalerba

src/cdk/testing/protractor/protractor-element.ts

@@ -80,7 +80,7 @@ export class ProtractorElement implements TestElement {
     return this.element.clear();
   }
 
-  async click(...args: ['center'] | [number, number]): Promise<void> {
+  async click(...args: [] | ['center'] | [number, number]): Promise<void> {
     // Omitting the offset argument to mouseMove results in clicking the center.
     // This is the default behavior we want, so we use an empty array of offsetArgs if no args are
     // passed to this method.

src/cdk/testing/testbed/unit-test-element.ts

@@ -78,7 +78,7 @@ export class UnitTestElement implements TestElement {
     await this._stabilize();
   }
 
-  async click(...args: ['center'] | [number, number]): Promise<void> {
+  async click(...args: [] | ['center'] | [number, number]): Promise<void> {
     let clientX: number | undefined = undefined;
     let clientY: number | undefined = undefined;
     if (args.length) {

src/material-experimental/mdc-button/testing/button-harness.ts

@@ -47,8 +47,8 @@ export class MatButtonHarness extends ComponentHarness {
   click(location: 'center'): Promise<void>;
   /** Clicks the button. */
   click(): Promise<void>;
-  async click(...args: ['center'] | [number, number]): Promise<void> {
-    return (await this.host()).click(...(args as [any]));
+  async click(...args: [] | ['center'] | [number, number]): Promise<void> {
+    return (await this.host()).click(...(args as []));
   }
 
   /** Gets a boolean promise indicating if the button is disabled. */

src/material/button/testing/button-harness.ts

@@ -47,8 +47,8 @@ export class MatButtonHarness extends ComponentHarness {
   click(location: 'center'): Promise<void>;
   /** Clicks the button. */
   click(): Promise<void>;
-  async click(...args: ['center'] | [number, number]): Promise<void> {
-    return (await this.host()).click(...(args as [any]));
+  async click(...args: [] | ['center'] | [number, number]): Promise<void> {
+    return (await this.host()).click(...(args as []));
   }
 
   /** Whether the button is disabled. */

tools/public_api_guard/cdk/testing/protractor.d.ts

@@ -3,7 +3,7 @@ export declare class ProtractorElement implements TestElement {
     constructor(element: ElementFinder);
     blur(): Promise<void>;
     clear(): Promise<void>;
-    click(...args: ['center'] | [number, number]): Promise<void>;
+    click(...args: [] | ['center'] | [number, number]): Promise<void>;
     focus(): Promise<void>;
     getAttribute(name: string): Promise<string | null>;
     getCssValue(property: string): Promise<string>;

tools/public_api_guard/cdk/testing/testbed.d.ts

@@ -20,7 +20,7 @@ export declare class UnitTestElement implements TestElement {
     constructor(element: Element, _stabilize: () => Promise<void>);
     blur(): Promise<void>;
     clear(): Promise<void>;
-    click(...args: ['center'] | [number, number]): Promise<void>;
+    click(...args: [] | ['center'] | [number, number]): Promise<void>;
     focus(): Promise<void>;
     getAttribute(name: string): Promise<string | null>;
     getCssValue(property: string): Promise<string>;