babel.code.js

// how to add  ts interface by babel-types
const interfaces = path.insertAfter( 
      t.tSInterfaceDeclaration( 
          t.identifier('State'), 
          null, 
          null, 
          t.tsInterfaceBody(
              [ t.tsPropertySignature(t.stringLiteral('test'), t.tsTypeAnnotation(t.TSLiteralType(t.stringLiteral('string'))))  ] 
          )
      )
  )


// how to add  ts type by babel-types
const types = t.typeAlias(
      t.identifier("State"),
      t.typeParameterDeclaration(
          []
          // [t.TypeParameter(t.typeAnnotation(t.stringLiteralTypeAnnotation('string')), t.stringLiteralTypeAnnotation('string') , t.variance('plus'))]
      ),
      t.objectTypeAnnotation(
          [ 
              t.ObjectTypeProperty(t.identifier('test'), t.stringLiteralTypeAnnotation('string')) ,
              t.ObjectTypeProperty(t.identifier('aaa'), t.stringLiteralTypeAnnotation('string'))
          ]
      )
  )