Supporting different javascript runtime options. npm, yarn, and bun.

src/lucky.cr

@@ -18,6 +18,7 @@ require "./lucky/response"
 require "./lucky/cookies/*"
 require "./lucky/secure_headers/*"
 require "./lucky/route_helper"
+require "./lucky/js_bundlers/*"
 require "./lucky/*"
 require "./lucky/paginator/paginator"
 require "./lucky/paginator/*"

src/lucky/js_bundlers/base_bundler.cr

@@ -0,0 +1,2 @@
+class Lucky::JSBundlers::BaseJSBundler
+end

src/lucky/js_bundlers/bun_bundler.cr

@@ -0,0 +1,9 @@
+class Lucky::JSBundlers::BunBundler < Lucky::JSBundlers::BaseJSBundler
+  def self.install_command
+    "bun install"
+  end
+
+  def self.run_command
+    "bun run"
+  end
+end

src/lucky/js_bundlers/yarn_bundler.cr

@@ -0,0 +1,9 @@
+class Lucky::JSBundlers::YarnBundler < Lucky::JSBundlers::BaseJSBundler
+  def self.install_command
+    "yarn install"
+  end
+
+  def self.run_command
+    "yarn run"
+  end
+end

src/lucky/server_settings.cr

@@ -26,6 +26,23 @@ module Lucky::ServerSettings
     settings["extra_watch_paths"]?.try(&.as_a.map(&.as_s)) || [] of String
   end
 
+  def js_bundler : Lucky::JsBundlers::Base
+    if settings["js_bundler"]?
+      case settings["js_bundler"].as_s
+      when "bun"
+        Lucky::JsBundlers::BunBundler.new
+      when "npm"
+        Lucky::JsBundlers::NpmBundler.new
+      when "yarn"
+        Lucky::JsBundlers::YarnBundler.new
+      else
+        raise "Unknown JS bundler: #{settings["js_bundler"].as_s}"
+      end
+    else
+      Lucky::JsBundlers::Esbuild.new # Default to esbuild if not specified
+    end
+  end
+
   @@__settings : YAML::Any? = nil
 
   private def settings : YAML::Any

tasks/watch.cr

@@ -110,10 +110,22 @@ module LuckySentry
       @options = ["-c", "bs-config.js", "--port", Lucky::ServerSettings.reload_port, "-p", host_url].join(" ")
     end
 
+    def js_bundler : Lucky::JsBundlers::Base
+      if File.exist?("yarn.lock")
+        "yarn"
+      elsif File.exist?("package-lock.json")
+        "npm"
+      elsif File.exist?("bun.lockb")
+        "bun"
+      else
+        raise "Unknown JS bundler: #{settings["js_bundler"].as_s}"
+      end
+    end
+
     def start : Nil
       spawn do
         Process.run \
-          "RUNNING_IN_BROWSERSYNC=true yarn run browser-sync start #{@options}",
+          "RUNNING_IN_BROWSERSYNC=true #{js_bundler} run browser-sync start #{@options}",
           output: STDOUT,
           error: STDERR,
           shell: true
@@ -124,7 +136,7 @@ module LuckySentry
     def reload : Nil
       if running?
         Process.run \
-          "yarn run browser-sync reload --port #{Lucky::ServerSettings.reload_port}",
+          "#{js_bundler} run browser-sync reload --port #{Lucky::ServerSettings.reload_port}",
           output: STDOUT,
           error: STDERR,
           shell: true