emo package dependencies not showing up in tools::package_dependencies

i want to check if this is an emo problem before i submit to cran dev team

> packageDescription('emo')
Package: emo
Title: Easily Insert 'Emoji'
Version: 0.0.0.9000
Authors@R: c( person("Hadley", "Wickham", , "hadley@rstudio.com", role = c("aut",
          "cre")), person("Romain", "François", , "romain@thinkr.fr", role = c("aut")),
          person("Lucy", "D'Agostino McGowan", email = "ld.mcgowan@vanderbilt.edu", role
          = c("aut")), person("RStudio", role = "cph") )
Description: Makes it easy to insert 'emoji' based on either their name or a descriptive
          keyword.
Depends: R (>= 2.10)
License: GPL-3
Encoding: UTF-8
LazyData: true
Imports: tibble, stringr, dplyr, glue, crayon, utils, magrittr, assertthat, lubridate,
          rlang, purrr, miniUI, shiny
RoxygenNote: 6.0.1.9000
URL: https://github.com/hadley/emo
BugReports: https://github.com/hadley/emo/issues
Suggests: testthat
Author: Hadley Wickham [aut, cre], Romain François [aut], Lucy D'Agostino McGowan [aut],
          RStudio [cph]
Maintainer: Hadley Wickham <hadley@rstudio.com>
Built: R 3.3.2; ; 2017-09-12 11:42:32 UTC; unix
RemoteType: github
RemoteHost: https://api.github.com
RemoteRepo: emo
RemoteUsername: hadley
RemoteRef: master
RemoteSha: 86af4e6af55eaf15f225731e86e98ac086d3a015
GithubRepo: emo
GithubUsername: hadley
GithubRef: master
GithubSHA1: 86af4e6af55eaf15f225731e86e98ac086d3a015

-- File: /Library/Frameworks/R.framework/Versions/3.3/Resources/library/emo/Meta/package.rds 
> tools::package_dependencies('emo',which = c('Depends','Imports'),recursive = TRUE)
$emo
NULL

> devtools::session_info()
Session info --------------------------------------------------------------------------------------
 setting  value                       
 version  R version 3.3.2 (2016-10-31)
 system   x86_64, darwin13.4.0        
 ui       RStudio (1.1.331)           
 language (EN)                        
 collate  en_US.UTF-8                 
 tz       America/New_York            
 date     2017-09-29                  

Packages ------------------------------------------------------------------------------------------
 package    * version    date       source                             
 assertthat   0.2.0      2017-04-11 cran (@0.2.0)                      
 base       * 3.3.2      2016-10-31 local                              
 bindr        0.1        2016-11-13 cran (@0.1)                        
 bindrcpp     0.2        2017-06-17 cran (@0.2)                        
 crayon       1.3.4      2017-09-16 Github (gaborcsardi/crayon@b5221ab)
 datasets   * 3.3.2      2016-10-31 local                              
 devtools     1.13.3     2017-08-02 cran (@1.13.3)                     
 digest       0.6.12     2017-01-27 cran (@0.6.12)                     
 dplyr        0.7.3      2017-09-09 cran (@0.7.3)                      
 emo          0.0.0.9000 2017-09-12 Github (hadley/emo@86af4e6)        
 glue         1.1.1      2017-06-21 cran (@1.1.1)                      
 graphics   * 3.3.2      2016-10-31 local                              
 grDevices  * 3.3.2      2016-10-31 local                              
 htmltools    0.3.6      2017-04-28 CRAN (R 3.3.2)                     
 httpuv       1.3.5      2017-07-04 cran (@1.3.5)                      
 lubridate    1.6.0      2016-09-13 CRAN (R 3.3.0)                     
 magrittr     1.5        2014-11-22 CRAN (R 3.3.0)                     
 memoise      1.1.0      2017-09-07 local                              
 methods    * 3.3.2      2016-10-31 local                              
 mime         0.5        2016-07-07 CRAN (R 3.3.0)                     
 miniUI       0.1.1      2016-01-15 CRAN (R 3.3.0)                     
 pillar       0.0.0.9000 2017-09-26 Github (hadley/pillar@831aade)     
 pkgconfig    2.0.1      2017-03-21 cran (@2.0.1)                      
 purrr        0.2.3      2017-08-02 cran (@0.2.3)                      
 R6           2.2.2      2017-06-17 cran (@2.2.2)                      
 Rcpp         0.12.12    2017-07-15 CRAN (R 3.3.2)                     
 rlang        0.1.2      2017-08-09 cran (@0.1.2)                      
 rstudioapi   0.7        2017-09-07 cran (@0.7)                        
 shiny        1.0.5      2017-08-23 cran (@1.0.5)                      
 sinew      * 0.3.4      2017-09-29 local                              
 stats      * 3.3.2      2016-10-31 local                              
 stringi      1.1.5      2017-04-07 CRAN (R 3.3.2)                     
 stringr      1.2.0      2017-02-18 CRAN (R 3.3.2)                     
 tibble       1.3.4.9001 2017-09-26 Github (tidyverse/tibble@31197c2)  
 tools        3.3.2      2016-10-31 local                              
 utils      * 3.3.2      2016-10-31 local                              
 withr        2.0.0      2017-07-28 CRAN (R 3.3.2)                     
 xtable       1.8-2      2016-02-05 CRAN (R 3.3.0)                     
 yaml         2.1.14     2016-11-12 cran (@2.1.14)

hadley / emo

emo package dependencies not showing up in tools::package_dependencies #34