fix(core): box-shadow 'none' handling (#10405)

packages/core/ui/styling/css-shadow.spec.ts

@@ -7,11 +7,11 @@ describe('css-shadow', () => {
 	it('empty', () => {
 		const shadow = parseCSSShadow('');
 		expect(shadow.inset).toBe(false);
-		expect(shadow.offsetX).toBe(CoreTypes.zeroLength);
+		expect(shadow.offsetX).toBeUndefined();
 		expect(shadow.offsetY).toBeUndefined();
 		expect(shadow.blurRadius).toBeUndefined();
 		expect(shadow.spreadRadius).toBeUndefined();
-		expect(shadow.color).toEqual(new Color('black'));
+		expect(shadow.color).toBeUndefined();
 	});
 
 	it('1px 1px 2px black', () => {
@@ -134,4 +134,14 @@ describe('css-shadow', () => {
 		expect(shadow.spreadRadius).toBeUndefined();
 		expect(shadow.color).toEqual(new Color('#333'));
 	});
+
+	it('none', () => {
+		const shadow = parseCSSShadow('none');
+		expect(shadow.inset).toBe(false);
+		expect(shadow.offsetX).toBeUndefined();
+		expect(shadow.offsetY).toBeUndefined();
+		expect(shadow.blurRadius).toBeUndefined();
+		expect(shadow.spreadRadius).toBeUndefined();
+		expect(shadow.color).toBeUndefined();
+	});
 });

packages/core/ui/styling/css-shadow.ts

@@ -1,6 +1,6 @@
-import { CoreTypes } from '../../core-types';
 import { Color } from '../../color';
-import { Length } from './style-properties';
+import { CoreTypes } from '../../core-types';
+import { parseCSSShorthand } from './css-utils';
 
 export interface ShadowCSSValues {
 	inset: boolean;
@@ -11,57 +11,6 @@ export interface ShadowCSSValues {
 	color: Color;
 }
 
-/**
- * Matches whitespace except if the whitespace is contained in parenthesis - ex. rgb(a), hsl color.
- */
-const PARTS_RE = /\s(?![^(]*\))/;
-
-/**
- * Matches a Length value with or without a unit
- */
-const LENGTH_RE = /^-?[0-9]+[a-zA-Z%]*?$/;
-
-/**
- * Checks if the value is a Length or 0
- */
-const isLength = (v) => v === '0' || LENGTH_RE.test(v);
-
-export function parseCSSShorthand(value: string): {
-	values: Array<CoreTypes.LengthType>;
-	color: string;
-	inset: boolean;
-} {
-	const parts = value.trim().split(PARTS_RE);
-	const inset = parts.includes('inset');
-	const first = parts[0];
-	const last = parts[parts.length - 1];
-
-	if (first === 'none') {
-		return null;
-	}
-
-	let color = 'black';
-	if (first && !isLength(first) && first !== 'inset') {
-		color = first;
-	} else if (last && !isLength(last)) {
-		color = last;
-	}
-	const values = parts
-		.filter((n) => n !== 'inset')
-		.filter((n) => n !== color)
-		.map((val) => {
-			try {
-				return Length.parse(val);
-			} catch (err) {
-				return CoreTypes.zeroLength;
-			}
-		});
-	return {
-		inset,
-		color,
-		values,
-	};
-}
 /**
  * Parse a string into ShadowCSSValues
  * Supports any valid css box/text shadow combination.
@@ -80,6 +29,6 @@ export function parseCSSShadow(value: string): ShadowCSSValues {
 		offsetY: offsetY,
 		blurRadius: blurRadius,
 		spreadRadius: spreadRadius,
-		color: new Color(data.color),
+		color: data.color ? new Color(data.color) : undefined,
 	};
 }

packages/core/ui/styling/css-stroke.spec.ts

@@ -6,8 +6,8 @@ import { Color } from '../../color';
 describe('css-text-stroke', () => {
 	it('empty', () => {
 		const stroke = parseCSSStroke('');
-		expect(stroke.width).toBe(CoreTypes.zeroLength);
+		expect(stroke.width).toBeUndefined();
-		expect(stroke.color).toEqual(new Color('black'));
+		expect(stroke.color).toBeUndefined();
 	});
 
 	it('1px navy', () => {

packages/core/ui/styling/css-stroke.ts

@@ -1,6 +1,6 @@
 import { CoreTypes } from '../../core-types';
 import { Color } from '../../color';
-import { parseCSSShorthand } from './css-shadow';
+import { parseCSSShorthand } from './css-utils';
 
 export interface StrokeCSSValues {
 	width: CoreTypes.LengthType;
@@ -18,6 +18,6 @@ export function parseCSSStroke(value: string): StrokeCSSValues {
 
 	return {
 		width,
-		color: new Color(data.color),
+		color: data.color ? new Color(data.color) : undefined,
 	};
 }

packages/core/ui/styling/css-utils.ts

@@ -1,4 +1,6 @@
 import { Trace } from '../../trace';
+import { CoreTypes } from '../../core-types';
+import { Length } from './style-properties';
 
 export function cleanupImportantFlags(value: string, propertyName: string) {
 	const index = value?.indexOf('!important');
@@ -10,3 +12,60 @@ export function cleanupImportantFlags(value: string, propertyName: string) {
 	}
 	return value;
 }
+
+/**
+ * Matches whitespace except if the whitespace is contained in parenthesis - ex. rgb(a), hsl color.
+ */
+const PARTS_RE = /\s(?![^(]*\))/;
+
+/**
+ * Matches a Length value with or without a unit
+ */
+const LENGTH_RE = /^-?[0-9]+[a-zA-Z%]*?$/;
+
+/**
+ * Checks if the value is a Length or 0
+ */
+const isLength = (v) => v === '0' || LENGTH_RE.test(v);
+
+export function parseCSSShorthand(value: string): {
+	values: Array<CoreTypes.LengthType>;
+	color: string;
+	inset: boolean;
+} {
+	const parts = value.trim().split(PARTS_RE);
+	const first = parts[0];
+
+	if (['', 'none'].includes(first)) {
+		return {
+			inset: false,
+			color: undefined,
+			values: [],
+		};
+	} else {
+		const inset = parts.includes('inset');
+		const last = parts[parts.length - 1];
+		let color = 'black';
+		if (first && !isLength(first) && first !== 'inset') {
+			color = first;
+		} else if (last && !isLength(last)) {
+			color = last;
+		}
+
+		const values = parts
+			.filter((n) => n !== 'inset')
+			.filter((n) => n !== color)
+			.map((val) => {
+				try {
+					return Length.parse(val);
+				} catch (err) {
+					return CoreTypes.zeroLength;
+				}
+			});
+		return {
+			inset,
+			color,
+			values,
+		};
+	}
+}

packages/core/utils/index.d.ts

@@ -38,14 +38,14 @@ export function queueGC(delay?: number, useThrottle?: boolean);
  * @param fn Function to throttle
  * @param delay Customize the delay (default is 300ms)
  */
-export function throttle(fn: any, delay?: number);
+export function throttle<T extends Function = any>(fn: T, delay?: number): T;
 
 /**
  * A simple debounce utility
  * @param fn Function to debounce
  * @param delay Customize the delay (default is 300ms)
  */
-export function debounce(fn: any, delay?: number, options?: { leading?: boolean });
+export function debounce<T extends Function = any>(fn: T, delay?: number, options?: { leading?: boolean }): T;
 
 /**
  * Releases the reference to the wrapped native object