public validate()

in tools/pkglint/lib/rules.ts [157:195]
36 lines of code
10 McCabe index (conditional complexity)

  public validate(pkg: PackageJson): void {
    const readmeFile = path.join(pkg.packageRoot, 'README.md');

    const scopes = pkg.json['cdk-build'] && pkg.json['cdk-build'].cloudformation;
    if (!scopes) {
      return;
    }
    if (pkg.packageName === '@aws-cdk/core') {
      return;
    }
    const scope: string = typeof scopes === 'string' ? scopes : scopes[0];
    const serviceName = AWS_SERVICE_NAMES[scope];

    const headline = serviceName && `${serviceName} Construct Library`;

    if (!fs.existsSync(readmeFile)) {
      pkg.report({
        ruleName: this.name,
        message: 'There must be a README.md file at the root of the package',
        fix: () => fs.writeFileSync(
          readmeFile,
          [
            `## ${headline || pkg.json.description}`,
            'This module is part of the[AWS Cloud Development Kit](https://github.com/aws/aws-cdk) project.',
          ].join('\n'),
        ),
      });
    } else if (headline) {
      const requiredFirstLine = `## ${headline}`;
      const [firstLine, ...rest] = fs.readFileSync(readmeFile, { encoding: 'utf8' }).split('\n');
      if (firstLine !== requiredFirstLine) {
        pkg.report({
          ruleName: this.name,
          message: `The title of the README.md file must be "${headline}"`,
          fix: () => fs.writeFileSync(readmeFile, [requiredFirstLine, ...rest].join('\n')),
        });
      }
    }
  }