function extractExamples()

in e2e_server/server/generate/extract_examples.js [30:107]
66 lines of code
3 McCabe index (conditional complexity)

function extractExamples(exampleRelativePath = 'storybook/stories') {
  // eslint-disable-next-line no-console
  console.log('Extract examples from', path.join(process.cwd(), exampleRelativePath));

  const fileNames = readdirSync(exampleRelativePath).filter((item) => item.includes('.stories.ts'));

  // eslint-disable-next-line no-console
  console.log('Total example files:', fileNames.length);

  return fileNames
    .map((groupFile) => {
      const examples = [];
      let groupTitle = '';
      // https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#using-the-type-checker
      // Build a program using the set of root file names in fileNames
      const program = ts.createProgram([groupFile], {
        module: ts.ModuleKind.ES2015,
        moduleResolution: ts.ModuleResolutionKind.NodeJs,
        target: ts.ScriptTarget.ES5,
      });
      // Visit every sourceFile in the program
      program
        .getSourceFiles()
        .filter(({ fileName }) => fileName === groupFile)
        .forEach((sourceFile) => {
          ts.forEachChild(sourceFile, (node) => {
            // get the default export
            if (node.kind === ts.SyntaxKind.ExportAssignment) {
              groupTitle = node.expression.properties.find((p) => p.name.escapedText === 'title').initializer.text;
            }
            // get the named export
            if (node.kind === ts.SyntaxKind.ExportDeclaration) {
              examples.push({
                filename: node.moduleSpecifier.text,
                name: node.exportClause.elements[0].name.escapedText,
              });
            }
          });
        });
      return {
        groupFile,
        groupTitle,
        examples,
      };
    })
    .map(({ groupFile, groupTitle, examples }) => {
      // slugify the group title
      const slugifiedGroupTitle = slugify(groupTitle.toLowerCase().split('/').join('-'), {
        lower: true,
        strict: true,
      });
      const exampleFiles = examples.map(({ name, filename }) => {
        const urlPath = name
          .replaceAll(/([A-Z])/g, '-$1')
          .trim()
          .toLocaleLowerCase();
        // TODO fix poor slug matching for special characters
        const slugifiedURLPath = slugify(urlPath, { lower: true, strict: true })
          .replace(/^-+|-+$/, '')
          .trim();
        const url = `/story/${slugifiedGroupTitle}--${slugifiedURLPath}`;
        return {
          slugifiedName: slugifiedURLPath,
          name,
          filename,
          url,
          groupTitle,
          filePath: path.join(path.relative(process.cwd(), path.dirname(groupFile)), filename),
        };
      });
      return {
        groupFile,
        slugifiedGroupTitle,
        groupTitle,
        exampleFiles,
      };
    });
}