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optionalChaining
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packages/gatsby-theme/src/components/templates/Tutorial.tsx

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@@ -20,9 +20,9 @@ const TutorialLayout: React.FunctionComponent<TutorialLayoutProps> = ({
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}
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const { pageTitle } = data!.mdx!.frontmatter!;
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const tutorialTitle = optionalChaining(() => data!.tutorialTitle!.frontmatter!.tutorialTitle!);
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const chapters = data!.pageTitles!.edges!.map(
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const chapters = optionalChaining(() => data!.pageTitles!.edges!.map(
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a => a.node!.frontmatter!.pageTitle!,
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);
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)) || [];
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const { location } = props;
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return (

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