Conform more of the codebase to strictNullChecks
(#10602)
* Conform more of the codebase to `strictNullChecks` * Conform more of the codebase to `strictNullChecks` * Fix types
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26 changed files with 79 additions and 49 deletions
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@ -124,7 +124,7 @@ export default class ReadReceiptMarker extends React.PureComponent<IProps, IStat
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private buildReadReceiptInfo(target: IReadReceiptInfo = {}): IReadReceiptInfo {
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const element = this.avatar.current;
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// this is the mx_ReadReceiptsGroup_container
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const horizontalContainer = element.offsetParent;
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const horizontalContainer = element?.offsetParent;
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if (!horizontalContainer || !(horizontalContainer instanceof HTMLElement)) {
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// this seems to happen sometimes for reasons I don't understand
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// the docs for `offsetParent` say it may be null if `display` is
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