fix: typescript interface updates (#973)

* fix: update type alias to enum for better typing support.

* fix: update type/ inteface names to follow TitleCase.

* fix: runOnly interface issue #972

* fix: revert to type over enum, to avoid breaking change/ major release.

axe.d.ts

@@ -10,7 +10,7 @@ declare module axe {
 
 	type ReporterVersion = "v1" | "v2";
 
-	type RunOnlyType = "rule" | "rules" | "tag" | "tags";
+	type RunOnlyType = "rule" | "rules" | "tag" | "tags";	
 
 	type resultGroups = "inapplicable" | "passes" | "incomplete" | "violations";
 
@@ -19,13 +19,13 @@ declare module axe {
 		exclude?: string[] | string[][]
 	}
 
-	type RunCallback = (error: Error, results:AxeResults) => void;
+	type RunCallback = (error: Error, results: AxeResults) => void;
 
 	type ElementContext = Node | string | RunOnlyObject;
 
 	interface RunOnly {
 		type: RunOnlyType,
-		values?: TagValue[] | RunOnlyObject
+		values?: TagValue[] | string[]
 	}
 	interface RunOptions {
 		runOnly?: RunOnly,
@@ -103,12 +103,12 @@ declare module axe {
 	}
 	interface AxePlugin {
 		id: string,
-		run(...args:any[]): any,
+		run(...args: any[]): any,
 		commands: {
 			id: string,
-			callback(...args:any[]): void
+			callback(...args: any[]): void
 		}[],
-		cleanup?(callback:Function): void
+		cleanup?(callback: Function): void
 	}
 
 	let plugins: any
@@ -133,7 +133,7 @@ declare module axe {
 	 */
 	function run(context?: ElementContext): Promise<AxeResults>
 	function run(options: RunOptions): Promise<AxeResults>
-	function run(callback: (error: Error, results:AxeResults) => void): void
+	function run(callback: (error: Error, results: AxeResults) => void): void
 	function run(context: ElementContext, callback: RunCallback): void
 	function run(options: RunOptions, callback: RunCallback): void
 	function run(context: ElementContext, options: RunOptions): Promise<AxeResults>