Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.
Namespace in Imports field not imported from: 'purrr'
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.
Running examples in ‘h3jsr-Ex.R’ failed
The error most likely occurred in:

> ### Name: get_children
> ### Title: get child H3 cell indices
> ### Aliases: get_children
> 
> ### ** Examples
> 
> # What are the children of this resolution 6 cell index at resolution 8?
> get_children(h3_address = '86be8d12fffffff', res = 8)
Error in context_eval(join(src), private$context, serialize) : 
  TypeError: undefined is not a function
Calls: get_children ... <Anonymous> -> evaluate_js -> get_str_output -> context_eval
Execution halted
Error(s) in re-building vignettes:
  ...
--- re-building ‘intro-to-h3jsr.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Linking to GEOS 3.6.4, GDAL 2.2.4, PROJ 5.2.0

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Warning in st_centroid.sf(nc) :
  st_centroid assumes attributes are constant over geometries of x
Quitting from lines 103-111 (intro-to-h3jsr.Rmd) 
Error: processing vignette 'intro-to-h3jsr.Rmd' failed with diagnostics:
TypeError: undefined is not a function
--- failed re-building ‘intro-to-h3jsr.Rmd’

SUMMARY: processing the following file failed:
  ‘intro-to-h3jsr.Rmd’

Error: Vignette re-building failed.
Execution halted
Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘purrr’
  All declared Imports should be used.