tree-shaking-server-side-code-5.ts

import * as ts from 'typescript';

const transformerFactory: ts.TransformerFactory<ts.SourceFile> = (
  context: ts.TransformationContext,
) => {
  return (sourceFile: ts.SourceFile) => {
    const someVisitFunction: ts.Visitor = (node: ts.Node) => {
      if (ts.isFunctionDeclaration(node)) {
        console.log('Whooah, it is a function declaration!');
      }

      return ts.visitEachChild(node, someVisitFunction, context);
    };

    return ts.visitEachChild(sourceFile, someVisitFunction, context);
  };
};