Using conditionalPanel inside of Shiny Modules

app.R

testUI <- function(id, label = "CSV file") {
  # Create a namespace function using the provided id
  ns <- NS(id)
  
  tagList(
    
    selectizeInput(
      ns('mySelect'), 'Test Select', choices = state.name,
      options = list(
        placeholder = 'Please select an option below',
        onInitialize = I('function() { this.setValue(""); }')
      )
    ),
    
    conditionalPanel(sprintf("input['%s'] != ''", ns("mySelect")), # works properly
      
      actionButton("go1", "Go Button1")),
    
    conditionalPanel(sprintf("input.%s != ''", ns("mySelect")), # will always show its content
      
      actionButton("go2", "Go Button2")) 
    
  )
}

new_ui <- fluidPage(
    testUI('myNamespace')
  )
)

server <- shinyServer(function(input, output) {})

shinyApp(ui = new_ui, server = server)