Warning: A runtime exception has occured while executing JavaScript

Hello John,
Thank you so much for making xaringanBuilder. It has been a great help to me and my students. I am having a problem with it building a slide deck. Can I do anything to fix the warning/exception/problem shown below?

The issue:

Warning: A runtime exception has occured while executing JavaScript
  Runtime exception message:
    ReferenceError: $ is not defined
    at http://127.0.0.1:6101/X_files/kePrint-0.0.1/kePrint.js:1:1

The code

xaringanBuilder::build_pdf("./X.Rmd")

The Rmd file

---
title: "Bug"
output:
  xaringan::moon_reader
---

```{r packages}
suppressPackageStartupMessages(library(dplyr))
suppressPackageStartupMessages(library(kableExtra))
```


```{r, echo=FALSE}
datasets::anscombe %>% 
  select(x1, y1, x2, y2, x3, y3, x4, y4) %>% 
  kbl(col.names = rep(c("x", "y"), 4), align='c') %>% 
  add_header_above(c("Group 1" = 2, "Group 2" = 2, "Group 3" = 2, "Group 4" = 2))
```

Session info

─ Session info  🤦🏽  💪🏻  🕜   ─────────────────────────────────────────────────────────────────────────────────────────────────
 hash: person facepalming: medium skin tone, flexed biceps: light skin tone, one-thirty

 setting  value
 version  R version 4.1.0 (2021-05-18)
 os       macOS Big Sur 11.6.2
 system   x86_64, darwin17.0
 ui       RStudio
 language (EN)
 collate  en_US.UTF-8
 ctype    en_US.UTF-8
 tz       America/New_York
 date     2022-01-05
 rstudio  2021.09.1+372 Ghost Orchid (desktop)
 pandoc   2.14.0.3 @ /Applications/RStudio.app/Contents/MacOS/pandoc/ (via rmarkdown)

─ Packages ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────
 package         * version date (UTC) lib source
 assertthat        0.2.1   2019-03-21 [1] CRAN (R 4.1.0)
 cachem            1.0.6   2021-08-19 [1] CRAN (R 4.1.0)
 callr             3.7.0   2021-04-20 [1] CRAN (R 4.1.0)
 cli               3.1.0   2021-10-27 [1] CRAN (R 4.1.0)
 colorspace        2.0-2   2021-06-24 [1] CRAN (R 4.1.0)
 crayon            1.4.2   2021-10-29 [1] CRAN (R 4.1.0)
 DBI               1.1.1   2021-01-15 [1] CRAN (R 4.1.0)
 desc              1.4.0   2021-09-28 [1] CRAN (R 4.1.0)
 devtools        * 2.4.3   2021-11-30 [1] CRAN (R 4.1.0)
 digest            0.6.29  2021-12-01 [1] CRAN (R 4.1.0)
 dplyr           * 1.0.7   2021-06-18 [1] CRAN (R 4.1.0)
 ellipsis          0.3.2   2021-04-29 [1] CRAN (R 4.1.0)
 evaluate          0.14    2019-05-28 [1] CRAN (R 4.1.0)
 fansi             0.5.0   2021-05-25 [1] CRAN (R 4.1.0)
 fastmap           1.1.0   2021-01-25 [1] CRAN (R 4.1.0)
 fs                1.5.2   2021-12-08 [1] CRAN (R 4.1.0)
 generics          0.1.1   2021-10-25 [1] CRAN (R 4.1.0)
 glue              1.6.0   2021-12-17 [1] CRAN (R 4.1.0)
 htmltools         0.5.2   2021-08-25 [1] CRAN (R 4.1.0)
 httr              1.4.2   2020-07-20 [1] CRAN (R 4.1.0)
 kableExtra      * 1.3.4   2021-02-20 [1] CRAN (R 4.1.0)
 knitr           * 1.37    2021-12-16 [1] CRAN (R 4.1.0)
 lifecycle         1.0.1   2021-09-24 [1] CRAN (R 4.1.0)
 magrittr          2.0.1   2020-11-17 [1] CRAN (R 4.1.0)
 memoise           2.0.1   2021-11-26 [1] CRAN (R 4.1.0)
 munsell           0.5.0   2018-06-12 [1] CRAN (R 4.1.0)
 pillar            1.6.4   2021-10-18 [1] CRAN (R 4.1.0)
 pkgbuild          1.2.1   2021-11-30 [1] CRAN (R 4.1.0)
 pkgconfig         2.0.3   2019-09-22 [1] CRAN (R 4.1.0)
 pkgload           1.2.4   2021-11-30 [1] CRAN (R 4.1.0)
 prettyunits       1.1.1   2020-01-24 [1] CRAN (R 4.1.0)
 processx          3.5.2   2021-04-30 [1] CRAN (R 4.1.0)
 ps                1.6.0   2021-02-28 [1] CRAN (R 4.1.0)
 purrr             0.3.4   2020-04-17 [1] CRAN (R 4.1.0)
 R6                2.5.1   2021-08-19 [1] CRAN (R 4.1.0)
 remotes           2.4.2   2021-11-30 [1] CRAN (R 4.1.0)
 rlang             0.4.12  2021-10-18 [1] CRAN (R 4.1.0)
 rmarkdown         2.11    2021-09-14 [1] CRAN (R 4.1.0)
 rprojroot         2.0.2   2020-11-15 [1] CRAN (R 4.1.0)
 rstudioapi        0.13    2020-11-12 [1] CRAN (R 4.1.0)
 rvest             1.0.2   2021-10-16 [1] CRAN (R 4.1.0)
 scales            1.1.1   2020-05-11 [1] CRAN (R 4.1.0)
 sessioninfo       1.2.1   2021-11-02 [1] CRAN (R 4.1.0)
 stringi           1.7.6   2021-11-29 [1] CRAN (R 4.1.0)
 stringr           1.4.0   2019-02-10 [1] CRAN (R 4.1.0)
 svglite           2.0.0   2021-02-20 [1] CRAN (R 4.1.0)
 systemfonts       1.0.3   2021-10-13 [1] CRAN (R 4.1.0)
 testthat        * 3.1.1   2021-12-03 [1] CRAN (R 4.1.0)
 tibble            3.1.6   2021-11-07 [1] CRAN (R 4.1.0)
 tidyselect        1.1.1   2021-04-30 [1] CRAN (R 4.1.0)
 usethis         * 2.1.3   2021-10-27 [1] CRAN (R 4.1.0)
 utf8              1.2.2   2021-07-24 [1] CRAN (R 4.1.0)
 vctrs             0.3.8   2021-04-29 [1] CRAN (R 4.1.0)
 viridisLite       0.4.0   2021-04-13 [1] CRAN (R 4.1.0)
 webshot           0.5.2   2019-11-22 [1] CRAN (R 4.1.0)
 withr             2.4.3   2021-11-30 [1] CRAN (R 4.1.0)
 xaringanBuilder * 0.0.9   2021-11-27 [1] Github (jhelvy/xaringanBuilder@235c8c4)
 xfun              0.29    2021-12-14 [1] CRAN (R 4.1.0)
 xml2              1.3.3   2021-11-30 [1] CRAN (R 4.1.0)

 [1] /Library/Frameworks/R.framework/Versions/4.1/Resources/library

Reproduce the failure with xaringanBuilder::build_pdf("./X.Rmd") using the provided Rmd example, then inspect the generated X_files/kePrint-0.0.1/kePrint.js referenced in the exception. Trace why $ is unavailable during rendering and verify that the example builds without a JavaScript runtime exception.