spinjs/src/plugins/FlowRuntimePlugin.ts

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import { Builder } from '../Builder';
import { ConfigPlugin } from '../ConfigPlugin';
import Spin from '../Spin';
import JSRuleFinder from './shared/JSRuleFinder';

export default class FlowRuntimePLugin implements ConfigPlugin {
  public configure(builder: Builder, spin: Spin) {
    const stack = builder.stack;

    if (stack.hasAll(['flow-runtime', 'webpack']) && !stack.hasAny('dll')) {
      const jsRuleFinder = new JSRuleFinder(builder);
      const jsRule = jsRuleFinder.findAndCreateJSRule();
      jsRule.use = spin.merge(jsRule.use, {
        options: {
          plugins: [
            [
              'babel-plugin-flow-runtime',
              {
                assert: true,
                annotate: true
              }
            ]
          ]
        }
      });
    }
  }
}