fix(components/config): revert accidental breaking change resulting from the SkyAppRuntimeConfigParams.get method's return type (#534)

Author: Blackbaud-SteveBrush

libs/components/config/src/lib/params.spec.ts

@@ -137,11 +137,12 @@ describe('SkyAppRuntimeConfigParams', () => {
       }
     );
 
+    // TODO: In a breaking change, remove the `as unknown` declarations.
     expect(params.get('a1')).toBe('b');
-    expect(params.get('a2')).toBe(undefined);
+    expect(params.get('a2') as unknown).toBe(undefined);
     expect(params.get('a3')).toBe('d');
     expect(params.get('a4')).toBe('x');
-    expect(params.get('a5')).toBe(undefined);
+    expect(params.get('a5') as unknown).toBe(undefined);
   });
 
   it('should allow default values to be overridden by the query string', () => {

libs/components/config/src/lib/params.ts

@@ -121,17 +121,20 @@ export class SkyAppRuntimeConfigParams {
    * Returns the decoded value of the requested param.
    * @param key The parameter's key.
    */
-  public get(key: string): string | undefined {
+  public get(key: string): string {
     if (this.has(key)) {
       return decodeURIComponent(this.#params[key]);
     }
-    return;
+
+    // TODO: Return `string | undefined` in a breaking change.
+    return undefined as unknown as string;
   }
 
   /**
    * Returns the params object.
    * @param excludeDefaults Exclude params that have default values
    */
+  // TODO: Return a more specific type in a breaking change.
   public getAll(excludeDefaults?: boolean): Object {
     const filteredParams: { [key: string]: string } = {};