storybook/lib/cli/generators/REACT_NATIVE/index.js

import mergeDirs from 'merge-dirs';
import path from 'path';
import shell from 'shelljs';
import chalk from 'chalk';
import { getVersions, getPackageJson, writePackageJson, paddedLog } from '../../lib/helpers';

export default async npmOptions => {
  const [
    storybookVersion,
    actionsVersion,
    linksVersion,
    addonsVersion,
    babelCoreVersion,
    babelRuntimeVersion,
    propTypesVersion,
  ] = await getVersions(
    npmOptions,
    '@storybook/react-native',
    '@storybook/addon-actions',
    '@storybook/addon-links',
    '@storybook/addons',
    '@babel/core',
    '@babel/runtime',
    'prop-types'
  );

  // copy all files from the template directory to project directory
  mergeDirs(path.resolve(__dirname, 'template/'), '.', 'overwrite');

  // set correct project name on entry files if possible
  const dirname = shell.ls('-d', 'ios/*.xcodeproj').stdout;
  const projectName =
    dirname && dirname.slice('ios/'.length, dirname.length - '.xcodeproj'.length - 1);
  if (projectName) {
    shell.sed('-i', '%APP_NAME%', projectName, 'storybook/storybook.js');
  } else {
    paddedLog(
      chalk.red(
        'ERR: Could not determine project name, to fix: https://github.com/storybooks/storybook/issues/1277'
      )
    );
  }

  const packageJson = getPackageJson();

  packageJson.dependencies = packageJson.dependencies || {};
  packageJson.devDependencies = packageJson.devDependencies || {};

  packageJson.devDependencies['@storybook/react-native'] = storybookVersion;
  packageJson.devDependencies['@storybook/addon-actions'] = actionsVersion;
  packageJson.devDependencies['@storybook/addon-links'] = linksVersion;
  packageJson.devDependencies['@storybook/addons'] = addonsVersion;

  if (!packageJson.dependencies['@babel/core'] && !packageJson.devDependencies['@babel/core']) {
    packageJson.devDependencies['@babel/core'] = babelCoreVersion;
  }
  if (
    !packageJson.dependencies['@babel/runtime'] &&
    !packageJson.devDependencies['babel-runtime']
  ) {
    packageJson.devDependencies['@babel/runtime'] = babelRuntimeVersion;
  }

  if (!packageJson.dependencies['react-dom'] && !packageJson.devDependencies['react-dom']) {
    const reactVersion = packageJson.dependencies.react;
    packageJson.devDependencies['react-dom'] = reactVersion;
  }

  if (!packageJson.dependencies['prop-types'] && !packageJson.devDependencies['prop-types']) {
    packageJson.devDependencies['prop-types'] = propTypesVersion;
  }

  packageJson.scripts = packageJson.scripts || {};
  packageJson.scripts.storybook = 'storybook start -p 7007';

  writePackageJson(packageJson);
};