Fix addStep and addSteps types (fixes #1988)

Author: Meena

src/intro.ts

@@ -128,7 +128,7 @@ export class IntroJs {
     return this;
   }
 
-  addStep(step: IntroStep) {
+  addStep(step: Partial<IntroStep>) {
     if (!this._options.steps) {
       this._options.steps = [];
     }
@@ -138,7 +138,7 @@ export class IntroJs {
     return this;
   }
 
-  addSteps(steps: IntroStep[]) {
+  addSteps(steps: Partial<IntroStep>[]) {
     if (!steps.length) return this;
 
     for (let index = 0; index < steps.length; index++) {

tests/jest/core/steps.test.ts

@@ -1,6 +1,7 @@
 import { nextStep, previousStep } from "../../../src/core/steps";
 import _showElement from "../../../src/core/showElement";
 import { IntroJs } from "../../../src/intro";
+import introJs from "../../../src";
 
 jest.mock("../../../src/core/showElement");
 jest.mock("../../../src/core/exitIntro");
@@ -123,5 +124,39 @@ describe("steps", () => {
       expect(fnCompleteCallback).toBeCalledTimes(1);
       expect(fnCompleteCallback).toHaveBeenCalledWith(2, "end");
     });
+
+    test("should be able to add steps using addStep()", async () => {
+      const intro = introJs();
+
+      intro.addStep({
+        element: document.createElement("div"),
+        intro: "test step",
+      });
+
+      await intro.start();
+
+      expect(intro._introItems).toHaveLength(1);
+      expect(intro._introItems[0].intro).toBe("test step");
+    });
+
+    test("should be able to add steps using addSteps()", async () => {
+      const intro = introJs();
+
+      intro.addSteps([
+        {
+          intro: "first step",
+        },
+        {
+          element: document.createElement("div"),
+          intro: "second step",
+        },
+      ]);
+
+      await intro.start();
+
+      expect(intro._introItems).toHaveLength(2);
+      expect(intro._introItems[0].intro).toBe("first step");
+      expect(intro._introItems[1].intro).toBe("second step");
+    });
   });
 });