move engine-related code to separate files

pkg/api/api.go

@@ -164,19 +164,6 @@ const (
 	FormatESModule
 )
 
-type EngineName uint8
-
-const (
-	EngineChrome EngineName = iota
-	EngineEdge
-	EngineFirefox
-	EngineIE
-	EngineIOS
-	EngineNode
-	EngineOpera
-	EngineSafari
-)
-
 type Engine struct {
 	Name    EngineName
 	Version string

pkg/api/api_impl.go

@@ -329,26 +329,7 @@ func validateFeatures(log logger.Log, target Target, engines []Engine) (config.T
 				if patch, err := strconv.Atoi(match[3]); err == nil {
 					version = append(version, patch)
 				}
-				switch engine.Name {
-				case EngineChrome:
-					constraints[compat.Chrome] = version
-				case EngineEdge:
-					constraints[compat.Edge] = version
-				case EngineFirefox:
-					constraints[compat.Firefox] = version
-				case EngineIE:
-					constraints[compat.IE] = version
-				case EngineIOS:
-					constraints[compat.IOS] = version
-				case EngineNode:
-					constraints[compat.Node] = version
-				case EngineOpera:
-					constraints[compat.Opera] = version
-				case EngineSafari:
-					constraints[compat.Safari] = version
-				default:
-					panic("Invalid engine name")
-				}
+				constraints[convertEngineName(engine.Name)] = version
 				continue
 			}
 		}

pkg/api/api_js_table.go

@@ -0,0 +1,39 @@
+package api
+
+import "github.com/evanw/esbuild/internal/compat"
+
+type EngineName uint8
+
+const (
+	EngineChrome EngineName = iota
+	EngineEdge
+	EngineFirefox
+	EngineIE
+	EngineIOS
+	EngineNode
+	EngineOpera
+	EngineSafari
+)
+
+func convertEngineName(engine EngineName) compat.Engine {
+	switch engine {
+	case EngineChrome:
+		return compat.Chrome
+	case EngineEdge:
+		return compat.Edge
+	case EngineFirefox:
+		return compat.Firefox
+	case EngineIE:
+		return compat.IE
+	case EngineIOS:
+		return compat.IOS
+	case EngineNode:
+		return compat.Node
+	case EngineOpera:
+		return compat.Opera
+	case EngineSafari:
+		return compat.Safari
+	default:
+		panic("Invalid engine name")
+	}
+}

pkg/cli/cli_impl.go

@@ -886,17 +886,6 @@ func parseTargets(targets []string, arg string) (target api.Target, engines []ap
 		"es2022": api.ES2022,
 	}
 
-	validEngines := map[string]api.EngineName{
-		"chrome":  api.EngineChrome,
-		"edge":    api.EngineEdge,
-		"firefox": api.EngineFirefox,
-		"ie":      api.EngineIE,
-		"ios":     api.EngineIOS,
-		"node":    api.EngineNode,
-		"opera":   api.EngineOpera,
-		"safari":  api.EngineSafari,
-	}
-
 outer:
 	for _, value := range targets {
 		if valid, ok := validTargets[strings.ToLower(value)]; ok {

pkg/cli/cli_js_table.go

@@ -0,0 +1,14 @@
+package cli
+
+import "github.com/evanw/esbuild/pkg/api"
+
+var validEngines = map[string]api.EngineName{
+	"chrome":  api.EngineChrome,
+	"edge":    api.EngineEdge,
+	"firefox": api.EngineFirefox,
+	"ie":      api.EngineIE,
+	"ios":     api.EngineIOS,
+	"node":    api.EngineNode,
+	"opera":   api.EngineOpera,
+	"safari":  api.EngineSafari,
+}