function (file, dir = ".") 
{
    dirMode <- NULL
    if (!missing(file) && !missing(dir)) {
        stop("You must set either the file or the directory parameter, not both")
    }
    else if (missing(file)) {
        if (identical(dir, "")) {
            stop("You must specify either a file or directory parameter")
        }
        dirMode <- TRUE
        dir <- sub("/$", "", dir)
        file <- list.files(dir, "^plumber\\.r$", ignore.case = TRUE, 
            full.names = TRUE)
        if (length(file) == 0) {
            stop("No plumber.R file found in the specified directory: ", 
                dir)
        }
    }
    else {
        dirMode <- FALSE
    }
    entrypoint <- list.files(dir, "^entrypoint\\.r$", ignore.case = TRUE)
    if (dirMode && length(entrypoint) > 0) {
        old <- setwd(dir)
        on.exit(setwd(old))
        x <- source(entrypoint)
        pr <- x$value
        if (!("plumber" %in% class(pr))) {
            stop("entrypoint.R must return a runnable Plumber router.")
        }
        pr
    }
    else if (file.exists(file)) {
        plumber$new(file)
    }
    else {
        stop("File does not exist: ", file)
    }
}
<bytecode: 0x55df34386588>
<environment: namespace:plumber>