support emitDecoratorMetadata use refleact-metadata

.gitignore

@@ -3,6 +3,7 @@
 /esbuild
 /esbuild.exe
 /github/
+/.devcontainer/
 /npm/esbuild-darwin-64/bin/esbuild
 /npm/esbuild-freebsd-64/bin/esbuild
 /npm/esbuild-freebsd-arm64/bin/esbuild

cmd/esbuild/main.go

@@ -59,7 +59,7 @@ Advanced options:
   --metafile=...            Write metadata about the build to a JSON file
   --pure:N                  Mark the name N as a pure function for tree shaking
   --inject:F                Import the file F into all input files and
-                            automatically replace matching globals with imports
+							automatically replace matching globals with imports
   --tsconfig=...            Use this tsconfig.json file instead of other ones
   --out-extension:.js=.mjs  Use a custom output extension instead of ".js"
   --main-fields=...         Override the main file order in package.json
@@ -69,6 +69,7 @@ Advanced options:
   --color=...               Force use of color terminal escapes (true | false)
   --charset=utf8            Do not escape UTF-8 code points
   --avoid-tdz               An optimization for large bundles in Safari
+  --reflect-metadata                support tsconfig emitDecoratorMetadata
 
 Examples:
   # Produces dist/entry_point.js and dist/entry_point.js.map

internal/bundler/bundler.go

@@ -1335,10 +1335,11 @@ func (b *Bundle) generateMetadataJSON(results []OutputFile, asciiOnly bool) []by
 }
 
 type runtimeCacheKey struct {
-	MangleSyntax      bool
-	MinifyIdentifiers bool
-	ES6               bool
-	Platform          config.Platform
+	MangleSyntax         bool
+	MinifyIdentifiers    bool
+	ES6                  bool
+	UseDecoratorMetadata bool
+	Platform             config.Platform
 }
 
 type runtimeCache struct {
@@ -1354,17 +1355,18 @@ var globalRuntimeCache runtimeCache
 func (cache *runtimeCache) parseRuntime(options *config.Options) (source logger.Source, runtimeAST js_ast.AST, ok bool) {
 	key := runtimeCacheKey{
 		// All configuration options that the runtime code depends on must go here
-		MangleSyntax:      options.MangleSyntax,
-		MinifyIdentifiers: options.MinifyIdentifiers,
-		Platform:          options.Platform,
-		ES6:               runtime.CanUseES6(options.UnsupportedJSFeatures),
+		MangleSyntax:         options.MangleSyntax,
+		MinifyIdentifiers:    options.MinifyIdentifiers,
+		Platform:             options.Platform,
+		UseDecoratorMetadata: options.UseDecoratorMetadata,
+		ES6:                  runtime.CanUseES6(options.UnsupportedJSFeatures),
 	}
 
 	// Determine which source to use
 	if key.ES6 {
-		source = runtime.ES6Source
+		source = runtime.ES6Source(options)
 	} else {
-		source = runtime.ES5Source
+		source = runtime.ES5Source(options)
 	}
 
 	// Cache hit?

internal/bundler/bundler_ts_test.go

@@ -870,3 +870,84 @@ func TestExportTypeIssue379(t *testing.T) {
 		},
 	})
 }
+
+func TestTypeScriptDecoratorsMetadata(t *testing.T) {
+	ts_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/entry.ts": `
+				import * as AF from './af'
+				console.log(AF)
+			`,
+			"/af.ts": `
+				export function aaa(aa:AA1):void{
+					const b:string = "1" 
+					const {a} = aa;
+				}
+				export function bbb(bb:BB1):boolean{
+					const {b} = bb
+				}
+
+			`,
+			"/test.ts": `
+				export type Test = Element
+			`,
+		},
+		entryPaths: []string{"/entry.ts"},
+
+		options: config.Options{
+			Mode: config.ModeBundle,
+			// OutputFormat:  config.FormatCommonJS,
+			AbsOutputFile: "/out.js",
+			// UseRefleatMetaData
+		},
+	})
+}
+
+func TestTypeScriptDecoratorsMetadataClass(t *testing.T) {
+	ts_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/entry.ts": `
+				import * as AF from './af'
+				console.log(AF)
+			`,
+			"/af.ts": `
+				class Abc1{}
+
+				@Injectable
+				export default class Action {
+					constructor(
+						public readonly str:String="str",
+						public readonly middleware1: AA.MiddlewareFactory,
+						public readonly abc: Abc1,
+						public readonly def: DEF 
+					):void {
+						// super(reducer, api, middleware);
+					}
+					@loading()
+					@param()
+					async fetchList(aa:string):Promise{
+						// await aa
+						return aa
+					}
+				}
+
+			`,
+			"/metadata.ts": `
+				export const __metadata=function(){}
+			`,
+			"/test.ts": `
+				export type Test = Element
+			`,
+		},
+		entryPaths: []string{"/entry.ts"},
+
+		options: config.Options{
+			Mode: config.ModeBundle,
+
+			// OutputFormat:  config.FormatCommonJS,
+			AbsOutputFile:        "/out.js",
+			UseDecoratorMetadata: true,
+			// UseRefleatMetaData
+		},
+	})
+}

internal/bundler/bundler_tsconfig_test.go

@@ -634,3 +634,30 @@ func TestTsconfigPreserveTypeImports(t *testing.T) {
 		},
 	})
 }
+
+func TestTsconfigEmitDecoratorMetadata(t *testing.T) {
+	tsconfig_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/Users/user/project/src/entry.ts": `
+				import {x, y} from "./foo"
+				console.log(1 as x)
+			`,
+			"/Users/user/project/src/tsconfig.json": `{
+				"compilerOptions": {
+					"importsNotUsedAsValues": "preserve",
+					"emitDecoratorMetadata": true
+				}
+			}`,
+		},
+		entryPaths: []string{"/Users/user/project/src/entry.ts"},
+		options: config.Options{
+			Mode:          config.ModeBundle,
+			AbsOutputFile: "/Users/user/project/out.js",
+			ExternalModules: config.ExternalModules{
+				AbsPaths: map[string]bool{
+					"/Users/user/project/src/foo": true,
+				},
+			},
+		},
+	})
+}

internal/bundler/snapshots/snapshots_ts.txt

@@ -538,3 +538,63 @@ __decorate([
 
 // /entry.js
 console.log(all_default, all_computed_default, a, b, c, d, e_default2, f_default, g_default2, h_default, i, j, k_default);
+
+================================================================================
+TestTypeScriptDecoratorsMetadata
+---------- /out.js ----------
+// /af.ts
+const af_exports = {};
+__export(af_exports, {
+  aaa: () => aaa,
+  bbb: () => bbb
+});
+function aaa(aa) {
+  const b = "1";
+  const {a} = aa;
+}
+function bbb(bb) {
+  const {b} = bb;
+}
+
+// /entry.ts
+console.log(af_exports);
+
+================================================================================
+TestTypeScriptDecoratorsMetadataClass
+---------- /out.js ----------
+// /af.ts
+const af_exports = {};
+__export(af_exports, {
+  default: () => af_default
+});
+let Action = class {
+  constructor(str = "str", middleware1, abc, def) {
+    this.str = str;
+    this.middleware1 = middleware1;
+    this.abc = abc;
+    this.def = def;
+  }
+  async fetchList(aa) {
+    return aa;
+  }
+};
+__decorate([
+  loading(),
+  param(),
+  __metadata("design:type", Function),
+  __metadata("design:paramtypes", [Object]),
+  __metadata("design:returntype", Promise)
+], Action.prototype, "fetchList", null);
+Action = __decorate([
+  Injectable,
+  __metadata("design:paramtypes", [
+    String,
+    MiddlewareFactory,
+    Abc1,
+    DEF
+  ])
+], Action);
+var af_default = Action;
+
+// /entry.ts
+console.log(af_exports);

internal/bundler/snapshots/snapshots_tsconfig.txt

@@ -94,6 +94,13 @@ var baseurl_nested_default = {
 // /Users/user/project/entry.ts
 console.log(baseurl_dot_default, baseurl_nested_default);
 
+================================================================================
+TestTsconfigEmitDecoratorMetadata
+---------- /Users/user/project/out.js ----------
+// /Users/user/project/src/entry.ts
+import "./src/foo";
+console.log(1);
+
 ================================================================================
 TestTsconfigJsonBaseUrl
 ---------- /Users/user/project/out.js ----------

internal/config/config.go

@@ -174,6 +174,7 @@ type Options struct {
 	OmitRuntimeForTests     bool
 	PreserveUnusedImportsTS bool
 	UseDefineForClassFields bool
+	UseDecoratorMetadata    bool
 	AvoidTDZ                bool
 	ASCIIOnly               bool
 

internal/js_ast/js_ast.go

@@ -294,7 +294,7 @@ type Arg struct {
 	TSDecorators []Expr
 	Binding      Binding
 	Default      *Expr
-
+	Type         Ref
 	// "constructor(public x: boolean) {}"
 	IsTypeScriptCtorField bool
 }
@@ -305,11 +305,11 @@ type Fn struct {
 	Args         []Arg
 	Body         FnBody
 	ArgumentsRef Ref
-
-	IsAsync     bool
-	IsGenerator bool
-	HasRestArg  bool
-	HasIfScope  bool
+	ResultType   Ref
+	IsAsync      bool
+	IsGenerator  bool
+	HasRestArg   bool
+	HasIfScope   bool
 }
 
 type FnBody struct {
@@ -1290,12 +1290,13 @@ type ScopeMember struct {
 }
 
 type Scope struct {
-	Kind      ScopeKind
-	Parent    *Scope
-	Children  []*Scope
-	Members   map[string]ScopeMember
-	Generated []Ref
-
+	Kind        ScopeKind
+	Parent      *Scope
+	Children    []*Scope
+	Members     map[string]ScopeMember
+	Identifiers map[string]string
+	Generated   []Ref
+	// ArgsIdentifier map[string]string
 	// This is used to store the ref of the label symbol for ScopeLabel scopes.
 	LabelRef        Ref
 	LabelStmtIsLoop bool

internal/js_parser/js_parser.go

@@ -4106,12 +4106,12 @@ func (p *parser) parseFn(name *js_ast.LocRef, data fnOrArrowDataParse) (fn js_as
 			value := p.parseExpr(js_ast.LComma)
 			defaultValue = &value
 		}
-
+		argType := p.newSymbol(js_ast.SymbolHoisted, p.lexer.Identifier)
 		fn.Args = append(fn.Args, js_ast.Arg{
 			TSDecorators: tsDecorators,
 			Binding:      arg,
 			Default:      defaultValue,
-
+			Type:         argType,
 			// We need to track this because it affects code generation
 			IsTypeScriptCtorField: isTypeScriptCtorField,
 		})
@@ -4141,6 +4141,10 @@ func (p *parser) parseFn(name *js_ast.LocRef, data fnOrArrowDataParse) (fn js_as
 	if p.TS.Parse && p.lexer.Token == js_lexer.TColon {
 		p.lexer.Next()
 		p.skipTypeScriptReturnType()
+		// println(p.lexer.Identifier)
+		if p.lexer.Identifier != "" {
+			fn.ResultType = p.newSymbol(js_ast.SymbolHoisted, p.lexer.Identifier)
+		}
 	}
 
 	// "function foo(): any;"