fix(range): handle unsupported values for range min, max, and step

core/src/components/range/range.tsx

@@ -2,7 +2,7 @@ import type { ComponentInterface, EventEmitter } from '@stencil/core';
 import { Component, Element, Event, Host, Prop, State, Watch, h } from '@stencil/core';
 import { findClosestIonContent, disableContentScrollY, resetContentScrollY } from '@utils/content';
 import type { Attributes } from '@utils/helpers';
-import { inheritAriaAttributes, clamp, debounceEvent, renderHiddenInput } from '@utils/helpers';
+import { inheritAriaAttributes, clamp, debounceEvent, renderHiddenInput, isSafeNumber } from '@utils/helpers';
 import { printIonWarning } from '@utils/logging';
 import { isRTL } from '@utils/rtl';
 import { createColorClasses, hostContext } from '@utils/theme';
@@ -109,7 +109,11 @@ export class Range implements ComponentInterface {
    */
   @Prop() min = 0;
   @Watch('min')
-  protected minChanged() {
+  protected minChanged(newValue: number) {
+    if (!isSafeNumber(newValue)) {
+      this.min = 0;
+    }
+
     if (!this.noUpdate) {
       this.updateRatio();
     }
@@ -120,7 +124,11 @@ export class Range implements ComponentInterface {
    */
   @Prop() max = 100;
   @Watch('max')
-  protected maxChanged() {
+  protected maxChanged(newValue: number) {
+    if (!isSafeNumber(newValue)) {
+      this.max = 100;
+    }
+
     if (!this.noUpdate) {
       this.updateRatio();
     }
@@ -151,6 +159,12 @@ export class Range implements ComponentInterface {
    * Specifies the value granularity.
    */
   @Prop() step = 1;
+  @Watch('step')
+  protected stepChanged(newValue: number) {
+    if (!isSafeNumber(newValue)) {
+      this.step = 1;
+    }
+  }
 
   /**
    * If `true`, tick marks are displayed based on the step value.
@@ -300,6 +314,11 @@ export class Range implements ComponentInterface {
     }
 
     this.inheritedAttributes = inheritAriaAttributes(this.el);
+    // If min, max, or step are not safe, set them to 0, 100, and 1, respectively.
+    // Each watch does this, but not before the initial load.
+    this.min = isSafeNumber(this.min) ? this.min : 0;
+    this.max = isSafeNumber(this.max) ? this.max : 100;
+    this.step = isSafeNumber(this.step) ? this.step : 1;
   }
 
   componentDidLoad() {

core/src/components/range/test/range.spec.ts

@@ -28,6 +28,25 @@ describe('Range', () => {
       });
     });
 
+    it('should handle undefined min and max values by falling back to defaults', async () => {
+      const page = await newSpecPage({
+        components: [Range],
+        html: `<ion-range id="my-custom-range">
+        <div slot="label">Range</div>
+      </ion-range>`,
+      });
+
+      const range = page.body.querySelector('ion-range')!;
+      // Here we have to cast this to any, but in its react wrapper it accepts undefined as a valid value
+      range.min = undefined as any;
+      range.max = undefined as any;
+      range.step = undefined as any;
+      await page.waitForChanges();
+      expect(range.min).toBe(0);
+      expect(range.max).toBe(100);
+      expect(range.step).toBe(1);
+    });
+
     it('should return the clamped value for a range dual knob component', () => {
       sharedRange.min = 0;
       sharedRange.max = 100;

core/src/utils/floating-point/floating-point.spec.ts

@@ -11,12 +11,24 @@ describe('floating point utils', () => {
       const n = getDecimalPlaces(5);
       expect(n).toBe(0);
     });
+
+    it('should handle nullish values', () => {
+      expect(getDecimalPlaces(undefined as any)).toBe(0);
+      expect(getDecimalPlaces(null as any)).toBe(0);
+      expect(getDecimalPlaces(NaN as any)).toBe(0);
+    });
   });
 
   describe('roundToMaxDecimalPlaces', () => {
     it('should round to the highest number of places as references', async () => {
       const n = roundToMaxDecimalPlaces(5.12345, 1.12, 2.123);
       expect(n).toBe(5.123);
     });
+
+    it('should handle nullish values', () => {
+      expect(roundToMaxDecimalPlaces(undefined as any)).toBe(0);
+      expect(roundToMaxDecimalPlaces(null as any)).toBe(0);
+      expect(roundToMaxDecimalPlaces(NaN as any)).toBe(0);
+    });
   });
 });

core/src/utils/floating-point/index.ts

@@ -1,4 +1,7 @@
+import { isSafeNumber } from '@utils/helpers';
+
 export function getDecimalPlaces(n: number) {
+  if (!isSafeNumber(n)) return 0;
   if (n % 1 === 0) return 0;
   return n.toString().split('.')[1].length;
 }
@@ -36,6 +39,7 @@ export function getDecimalPlaces(n: number) {
  * be used as a reference for the desired specificity.
  */
 export function roundToMaxDecimalPlaces(n: number, ...references: number[]) {
+  if (!isSafeNumber(n)) return 0;
   const maxPlaces = Math.max(...references.map((r) => getDecimalPlaces(r)));
   return Number(n.toFixed(maxPlaces));
 }

core/src/utils/helpers.ts

@@ -424,3 +424,10 @@ export const getNextSiblingOfType = <T extends Element>(element: Element): T | n
   }
   return null;
 };
+
+/**
+ * Checks input for usable number. Not NaN and not Infinite.
+ */
+export const isSafeNumber = (input: unknown): input is number => {
+  return typeof input === 'number' && !isNaN(input) && isFinite(input);
+};