diff --git a/.Rbuildignore b/.Rbuildignore
index 8ed264c..292a130 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -6,7 +6,6 @@
 ^pkgdown$
 ^docs$
 
-^data-raw$
 ^CONTRIBUTING\.md$
 ^CODE_OF_CONDUCT\.md$
 ^LICENSE\.md$
diff --git a/DESCRIPTION b/DESCRIPTION
index 0129fe0..b2a1b93 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: ggsci
 Type: Package
 Title: Scientific Journal and Sci-Fi Themed Color Palettes for 'ggplot2'
-Version: 3.1.0
+Version: 3.1.0.9000
 Authors@R: c(
     person("Nan", "Xiao", email = "me@nanx.me", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0002-0250-5673")),
diff --git a/NEWS.md b/NEWS.md
index 9da0644..e2168dd 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,12 @@
+# ggsci 3.1.0.9000
+
+## Improvements
+
+- Move internal color palette data from `R/sysdata.rda` to `R/palettes.R`.
+  This change enhances package development transparency, reduces unnecessary
+  indirection, and simplifies contributions by avoiding the construction
+  of the palette data using the R script in `data-raw/` (#42).
+
 # ggsci 3.1.0
 
 ## New features
diff --git a/data-raw/data-generator.R b/R/palettes.R
similarity index 89%
rename from data-raw/data-generator.R
rename to R/palettes.R
index 3c164b5..f6dafdc 100644
--- a/data-raw/data-generator.R
+++ b/R/palettes.R
@@ -1,6 +1,7 @@
-# Generate internal color palettes data `R/sysdata.rda`:
-# - R Packages - Internal data. <https://r-pkgs.org/data.html#sec-data-sysdata>
-# - Name that Color. <http://chir.ag/projects/name-that-color/>
+# Construct color palettes data
+#
+# If not available, the color names are generated by "Name that Color" at
+# <http://chir.ag/projects/name-that-color/>.
 
 ggsci_db <- vector("list")
 
@@ -487,60 +488,3 @@ ggsci_db$"material"$"blue-grey" <- c(
   "BlueGrey600" = "#546E7A", "BlueGrey700" = "#455A64",
   "BlueGrey800" = "#37474F", "BlueGrey900" = "#263238"
 )
-
-save(ggsci_db, file = "R/sysdata.rda")
-
-test_barplot <- function(palette, type) {
-  pal <- ggsci_db[[palette]][[type]]
-  barplot(rep(1, length(pal)), col = pal)
-}
-
-test_barplot("npg", "nrc")
-test_barplot("aaas", "default")
-test_barplot("nejm", "default")
-test_barplot("lancet", "lanonc")
-test_barplot("jama", "default")
-test_barplot("bmj", "default")
-test_barplot("jco", "default")
-test_barplot("ucscgb", "default")
-test_barplot("d3", "category10")
-test_barplot("d3", "category20")
-test_barplot("d3", "category20b")
-test_barplot("d3", "category20c")
-test_barplot("locuszoom", "default")
-test_barplot("igv", "default")
-test_barplot("igv", "alternating")
-test_barplot("uchicago", "default")
-test_barplot("uchicago", "light")
-test_barplot("uchicago", "dark")
-test_barplot("cosmic", "hallmarks_dark")
-test_barplot("cosmic", "hallmarks_light")
-test_barplot("cosmic", "signature_substitutions")
-test_barplot("startrek", "uniform")
-test_barplot("tron", "legacy")
-test_barplot("futurama", "planetexpress")
-test_barplot("rickandmorty", "schwifty")
-test_barplot("simpsons", "springfield")
-test_barplot("gsea", "default")
-test_barplot("flatui", "default")
-test_barplot("flatui", "flattastic")
-test_barplot("flatui", "aussie")
-test_barplot("material", "red")
-test_barplot("material", "pink")
-test_barplot("material", "purple")
-test_barplot("material", "deep-purple")
-test_barplot("material", "indigo")
-test_barplot("material", "blue")
-test_barplot("material", "light-blue")
-test_barplot("material", "cyan")
-test_barplot("material", "teal")
-test_barplot("material", "green")
-test_barplot("material", "light-green")
-test_barplot("material", "lime")
-test_barplot("material", "yellow")
-test_barplot("material", "amber")
-test_barplot("material", "orange")
-test_barplot("material", "deep-orange")
-test_barplot("material", "brown")
-test_barplot("material", "grey")
-test_barplot("material", "blue-grey")
diff --git a/R/sysdata.rda b/R/sysdata.rda
deleted file mode 100644
index 6864dc9..0000000
Binary files a/R/sysdata.rda and /dev/null differ