replaceFileName.ts

import * as ts from "typescript"

const transformer: ts.TransformerFactory<ts.SourceFile> = (
  context,
) => {
  return (sourceFile) => {
    console.log("its me")
    const visitor = (
      node: ts.Node,
    ): ts.Node | undefined => {
      if (ts.isImportDeclaration(node)) {
        return undefined
      }

      if (ts.isIdentifier(node)) {
        switch (node.escapedText) {
          case "babel":
            return ts.factory.createIdentifier("a")

          case "plugins":
            return ts.factory.createIdentifier("b")
        }
      }

      return ts.visitEachChild(node, visitor, context)
    }

    const sourceFileVisitor = (
      sourceFile: ts.SourceFile,
    ): ts.SourceFile => {
      return ts.visitEachChild(sourceFile, visitor, context)
    }

    return ts.visitNode(
      sourceFile,
      sourceFileVisitor,
      ts.isSourceFile,
    )
  }
}

export default TransformStreamDefaultController