Feat: add footer and banner for css file

cmd/esbuild/main.go

@@ -54,16 +54,18 @@ var helpText = func(colors logger.Colors) string {
   --watch               Watch mode: rebuild on file system changes
 
 ` + colors.Bold + `Advanced options:` + colors.Default + `
-  --banner=...              Text to be prepended to each output file
+  --banner=...              Text to be prepended to each output JS file
   --charset=utf8            Do not escape UTF-8 code points
   --color=...               Force use of color terminal escapes (true | false)
   --error-limit=...         Maximum error count or 0 to disable (default 10)
-  --footer=...              Text to be appended to each output file
+  --footer=...              Text to be appended to each output JS file
   --inject:F                Import the file F into all input files and
                             automatically replace matching globals with imports
   --keep-names              Preserve "name" on functions and classes
   --log-level=...           Disable logging (info | warning | error | silent,
                             default info)
+  --css-banner=...			Text to be prepended to each output CSS file
+  --css-footer=...			Text to be appended to each output CSS file
   --main-fields=...         Override the main file order in package.json
                             (default "browser,module,main" when platform is
                             browser and "main,module" when platform is node)

internal/bundler/linker.go

@@ -4100,6 +4100,7 @@ func (repr *chunkReprCSS) generate(c *linkerContext, chunk *chunkInfo) func(gene
 	return func(continueData generateContinue) []OutputFile {
 		waitGroup.Wait()
 		j := js_printer.Joiner{}
+		prevOffset := lineColumnOffset{}
 		newlineBeforeComment := false
 
 		// Generate any prefix rules now
@@ -4134,8 +4135,15 @@ func (repr *chunkReprCSS) generate(c *linkerContext, chunk *chunkInfo) func(gene
 			}
 		}
 
-		// Start the metadata
 		jMeta := js_printer.Joiner{}
+		if len(c.options.CSSBanner) > 0 {
+			prevOffset.advanceString(c.options.CSSBanner)
+			prevOffset.advanceString("\n")
+			j.AddString(c.options.CSSBanner)
+			j.AddString("\n")
+		}
+
+		// Start the metadata
 		if c.options.AbsMetadataFile != "" {
 			isFirstMeta := true
 			jMeta.AddString("{\n      \"imports\": [")
@@ -4182,6 +4190,10 @@ func (repr *chunkReprCSS) generate(c *linkerContext, chunk *chunkInfo) func(gene
 			}
 		}
 
+		if len(c.options.CSSFooter) > 0 {
+			j.AddString(c.options.CSSFooter)
+		}
+
 		// Make sure the file ends with a newline
 		if j.Length() > 0 && j.LastByte() != '\n' {
 			j.AddString("\n")

internal/config/config.go

@@ -216,6 +216,8 @@ type Options struct {
 	InjectedFiles      []InjectedFile
 	Banner             string
 	Footer             string
+	CSSBanner          string
+	CSSFooter          string
 
 	Plugins []Plugin
 

lib/common.ts

@@ -112,6 +112,8 @@ function pushCommonFlags(flags: string[], options: CommonOptions, keys: OptionKe
   let keepNames = getFlag(options, keys, 'keepNames', mustBeBoolean);
   let banner = getFlag(options, keys, 'banner', mustBeString);
   let footer = getFlag(options, keys, 'footer', mustBeString);
+  let cssBanner = getFlag(options, keys, 'cssBanner', mustBeString);
+  let cssFooter = getFlag(options, keys, 'cssFooter', mustBeString);
 
   if (sourcesContent !== void 0) flags.push(`--sources-content=${sourcesContent}`);
   if (target) {
@@ -142,6 +144,8 @@ function pushCommonFlags(flags: string[], options: CommonOptions, keys: OptionKe
 
   if (banner) flags.push(`--banner=${banner}`);
   if (footer) flags.push(`--footer=${footer}`);
+  if (cssBanner) flags.push(`--css-banner=${cssBanner}`);
+  if (cssFooter) flags.push(`--css-footer=${cssFooter}`);
 }
 
 function flagsForBuildOptions(

lib/types.ts

@@ -28,6 +28,8 @@ interface CommonOptions {
   keepNames?: boolean;
   banner?: string;
   footer?: string;
+  cssBanner?: string;
+  cssFooter?: string;
 
   color?: boolean;
   logLevel?: LogLevel;

pkg/api/api.go

@@ -256,6 +256,8 @@ type BuildOptions struct {
 	Inject            []string
 	Banner            string
 	Footer            string
+	CSSBanner         string
+	CSSFooter         string
 	NodePaths         []string // The "NODE_PATH" variable from Node.js
 
 	EntryPoints []string
@@ -326,6 +328,8 @@ type TransformOptions struct {
 	TsconfigRaw string
 	Footer      string
 	Banner      string
+	CSSFooter   string
+	CSSBanner   string
 
 	Define    map[string]string
 	Pure      []string

pkg/api/api_impl.go

@@ -600,6 +600,8 @@ func rebuildImpl(
 		AbsNodePaths:          make([]string, len(buildOpts.NodePaths)),
 		Banner:                buildOpts.Banner,
 		Footer:                buildOpts.Footer,
+		CSSBanner:             buildOpts.CSSBanner,
+		CSSFooter:             buildOpts.CSSFooter,
 		WatchMode:             buildOpts.Watch != nil,
 		Plugins:               plugins,
 	}

pkg/cli/cli_impl.go

@@ -362,6 +362,22 @@ func parseOptionsImpl(osArgs []string, buildOpts *api.BuildOptions, transformOpt
 				transformOpts.Footer = value
 			}
 
+		case strings.HasPrefix(arg, "--css-banner="):
+			value := arg[len("--css-banner="):]
+			if buildOpts != nil {
+				buildOpts.CSSBanner = value
+			} else {
+				transformOpts.CSSBanner = value
+			}
+
+		case strings.HasPrefix(arg, "--css-footer="):
+			value := arg[len("--css-footer="):]
+			if buildOpts != nil {
+				buildOpts.CSSFooter = value
+			} else {
+				transformOpts.CSSFooter = value
+			}
+
 		case strings.HasPrefix(arg, "--error-limit="):
 			value := arg[len("--error-limit="):]
 			limit, err := strconv.Atoi(value)