Use terser for Javascript minification

This is needed because of the need to create two different JS rollups and because the default compressor fails. See link below. #352 (comment)
alphagov · Sep 17, 2024 · 7769965 · 7769965
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diff --git a/Gemfile b/Gemfile
@@ -2,3 +2,5 @@ source "https://rubygems.org"
 
 # Specify your gem's dependencies in govuk_tech_docs.gemspec
 gemspec
+
+gem "terser"
diff --git a/example/Gemfile b/example/Gemfile
@@ -1,3 +1,5 @@
 source "https://rubygems.org"
 
 gem "govuk_tech_docs", path: ".."
+
+gem "terser"
diff --git a/lib/govuk_tech_docs.rb b/lib/govuk_tech_docs.rb
@@ -57,6 +57,7 @@ def self.configure(context, options = {})
 
     context.configure :build do
       activate :autoprefixer
+      activate :minify_javascript, compressor: Terser.new
       # activate :minify_javascript, ignore: ["/raw_assets/*"]
     end
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2,3 +2,5 @@ source "https://rubygems.org"

		# Specify your gem's dependencies in govuk_tech_docs.gemspec
		gemspec

		gem "terser"