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34 lines
1.2 KiB
34 lines
1.2 KiB
export function isWindow(obj: any): obj is Window {
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return obj !== null && obj !== undefined && obj === obj.window;
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}
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export default function getScroll(
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target: HTMLElement | Window | Document | null,
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top: boolean,
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): number {
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if (typeof window === 'undefined') {
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return 0;
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}
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const method = top ? 'scrollTop' : 'scrollLeft';
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let result = 0;
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if (isWindow(target)) {
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result = target[top ? 'scrollY' : 'scrollX'];
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} else if (target instanceof Document) {
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result = target.documentElement[method];
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} else if (target instanceof HTMLElement) {
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result = target[method];
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} else if (target) {
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// According to the type inference, the `target` is `never` type.
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// Since we configured the loose mode type checking, and supports mocking the target with such shape below::
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// `{ documentElement: { scrollLeft: 200, scrollTop: 400 } }`,
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// the program may falls into this branch.
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// Check the corresponding tests for details. Don't sure what is the real scenario this happens.
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result = target[method];
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}
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if (target && !isWindow(target) && typeof result !== 'number') {
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result = ((target.ownerDocument ?? target) as any).documentElement?.[method];
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}
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return result;
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}
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