feat(ipuaro): add decorator extraction to initial context

Extract decorators from classes and methods for NestJS/Angular support.
Decorators are now shown in initial context:
- @Controller('users') class UserController
- @Get(':id') async getUser(id: string): Promise<User>

Changes:
- Add decorators field to FunctionInfo, MethodInfo, ClassInfo
- Update ASTParser to extract decorators from tree-sitter nodes
- Update formatFileSummary to display decorators prefix
- Add 18 unit tests for decorator extraction and formatting

packages/ipuaro/src/domain/value-objects/FileAST.ts

@@ -52,6 +52,8 @@ export interface FunctionInfo {
     isExported: boolean
     /** Return type (if available) */
     returnType?: string
+    /** Decorators applied to the function (e.g., ["@Get(':id')", "@Auth()"]) */
+    decorators?: string[]
 }
 
 export interface MethodInfo {
@@ -69,6 +71,8 @@ export interface MethodInfo {
     visibility: "public" | "private" | "protected"
     /** Whether it's static */
     isStatic: boolean
+    /** Decorators applied to the method (e.g., ["@Get(':id')", "@UseGuards(AuthGuard)"]) */
+    decorators?: string[]
 }
 
 export interface PropertyInfo {
@@ -105,6 +109,8 @@ export interface ClassInfo {
     isExported: boolean
     /** Whether class is abstract */
     isAbstract: boolean
+    /** Decorators applied to the class (e.g., ["@Controller('users')", "@Injectable()"]) */
+    decorators?: string[]
 }
 
 export interface InterfaceInfo {

packages/ipuaro/src/infrastructure/indexer/ASTParser.ts

@@ -264,13 +264,15 @@ export class ASTParser {
         const declaration = node.childForFieldName(FieldName.DECLARATION)
 
         if (declaration) {
+            const decorators = this.extractDecoratorsFromSiblings(declaration)
+
             switch (declaration.type) {
                 case NodeType.FUNCTION_DECLARATION:
-                    this.extractFunction(declaration, ast, true)
+                    this.extractFunction(declaration, ast, true, decorators)
                     this.addExportInfo(ast, declaration, "function", isDefault)
                     break
                 case NodeType.CLASS_DECLARATION:
-                    this.extractClass(declaration, ast, true)
+                    this.extractClass(declaration, ast, true, decorators)
                     this.addExportInfo(ast, declaration, "class", isDefault)
                     break
                 case NodeType.INTERFACE_DECLARATION:
@@ -309,7 +311,12 @@ export class ASTParser {
         }
     }
 
-    private extractFunction(node: SyntaxNode, ast: FileAST, isExported: boolean): void {
+    private extractFunction(
+        node: SyntaxNode,
+        ast: FileAST,
+        isExported: boolean,
+        externalDecorators: string[] = [],
+    ): void {
         const nameNode = node.childForFieldName(FieldName.NAME)
         if (!nameNode) {
             return
@@ -319,6 +326,9 @@ export class ASTParser {
         const isAsync = node.children.some((c) => c.type === NodeType.ASYNC)
         const returnTypeNode = node.childForFieldName(FieldName.RETURN_TYPE)
 
+        const nodeDecorators = this.extractNodeDecorators(node)
+        const decorators = [...externalDecorators, ...nodeDecorators]
+
         ast.functions.push({
             name: nameNode.text,
             lineStart: node.startPosition.row + 1,
@@ -327,6 +337,7 @@ export class ASTParser {
             isAsync,
             isExported,
             returnType: returnTypeNode?.text?.replace(/^:\s*/, ""),
+            decorators,
         })
     }
 
@@ -352,6 +363,7 @@ export class ASTParser {
                         isAsync,
                         isExported,
                         returnType: returnTypeNode?.text?.replace(/^:\s*/, ""),
+                        decorators: [],
                     })
 
                     if (isExported) {
@@ -374,7 +386,12 @@ export class ASTParser {
         }
     }
 
-    private extractClass(node: SyntaxNode, ast: FileAST, isExported: boolean): void {
+    private extractClass(
+        node: SyntaxNode,
+        ast: FileAST,
+        isExported: boolean,
+        externalDecorators: string[] = [],
+    ): void {
         const nameNode = node.childForFieldName(FieldName.NAME)
         if (!nameNode) {
             return
@@ -385,14 +402,19 @@ export class ASTParser {
         const properties: PropertyInfo[] = []
 
         if (body) {
+            let pendingDecorators: string[] = []
             for (const member of body.children) {
-                if (member.type === NodeType.METHOD_DEFINITION) {
-                    methods.push(this.extractMethod(member))
+                if (member.type === NodeType.DECORATOR) {
+                    pendingDecorators.push(this.formatDecorator(member))
+                } else if (member.type === NodeType.METHOD_DEFINITION) {
+                    methods.push(this.extractMethod(member, pendingDecorators))
+                    pendingDecorators = []
                 } else if (
                     member.type === NodeType.PUBLIC_FIELD_DEFINITION ||
                     member.type === NodeType.FIELD_DEFINITION
                 ) {
                     properties.push(this.extractProperty(member))
+                    pendingDecorators = []
                 }
             }
         }
@@ -400,6 +422,9 @@ export class ASTParser {
         const { extendsName, implementsList } = this.extractClassHeritage(node)
         const isAbstract = node.children.some((c) => c.type === NodeType.ABSTRACT)
 
+        const nodeDecorators = this.extractNodeDecorators(node)
+        const decorators = [...externalDecorators, ...nodeDecorators]
+
         ast.classes.push({
             name: nameNode.text,
             lineStart: node.startPosition.row + 1,
@@ -410,6 +435,7 @@ export class ASTParser {
             implements: implementsList,
             isExported,
             isAbstract,
+            decorators,
         })
     }
 
@@ -463,7 +489,7 @@ export class ASTParser {
         }
     }
 
-    private extractMethod(node: SyntaxNode): MethodInfo {
+    private extractMethod(node: SyntaxNode, decorators: string[] = []): MethodInfo {
         const nameNode = node.childForFieldName(FieldName.NAME)
         const params = this.extractParameters(node)
         const isAsync = node.children.some((c) => c.type === NodeType.ASYNC)
@@ -485,6 +511,7 @@ export class ASTParser {
             isAsync,
             visibility,
             isStatic,
+            decorators,
         }
     }
 
@@ -692,6 +719,49 @@ export class ASTParser {
         }
     }
 
+    /**
+     * Format a decorator node to a string like "@Get(':id')" or "@Injectable()".
+     */
+    private formatDecorator(node: SyntaxNode): string {
+        return node.text.replace(/\s+/g, " ").trim()
+    }
+
+    /**
+     * Extract decorators that are direct children of a node.
+     * In tree-sitter, decorators are children of the class/function declaration.
+     */
+    private extractNodeDecorators(node: SyntaxNode): string[] {
+        const decorators: string[] = []
+        for (const child of node.children) {
+            if (child.type === NodeType.DECORATOR) {
+                decorators.push(this.formatDecorator(child))
+            }
+        }
+        return decorators
+    }
+
+    /**
+     * Extract decorators from sibling nodes before the current node.
+     * Decorators appear as children before the declaration in export statements.
+     */
+    private extractDecoratorsFromSiblings(node: SyntaxNode): string[] {
+        const decorators: string[] = []
+        const parent = node.parent
+        if (!parent) {
+            return decorators
+        }
+
+        for (const sibling of parent.children) {
+            if (sibling.type === NodeType.DECORATOR) {
+                decorators.push(this.formatDecorator(sibling))
+            } else if (sibling === node) {
+                break
+            }
+        }
+
+        return decorators
+    }
+
     private classifyImport(from: string): ImportInfo["type"] {
         if (from.startsWith(".") || from.startsWith("/")) {
             return "internal"

packages/ipuaro/src/infrastructure/indexer/tree-sitter-types.ts

@@ -63,6 +63,9 @@ export const NodeType = {
     DEFAULT: "default",
     ACCESSIBILITY_MODIFIER: "accessibility_modifier",
     READONLY: "readonly",
+
+    // Decorators
+    DECORATOR: "decorator",
 } as const
 
 export type NodeTypeValue = (typeof NodeType)[keyof typeof NodeType]

packages/ipuaro/src/infrastructure/llm/prompts.ts

@@ -187,10 +187,22 @@ function formatFileOverview(
     return lines.join("\n")
 }
 
+/**
+ * Format decorators as a prefix string.
+ * Example: "@Get(':id') @Auth() "
+ */
+function formatDecoratorsPrefix(decorators: string[] | undefined): string {
+    if (!decorators || decorators.length === 0) {
+        return ""
+    }
+    return `${decorators.join(" ")} `
+}
+
 /**
  * Format a function signature.
  */
 function formatFunctionSignature(fn: FileAST["functions"][0]): string {
+    const decoratorsPrefix = formatDecoratorsPrefix(fn.decorators)
     const asyncPrefix = fn.isAsync ? "async " : ""
     const params = fn.params
         .map((p) => {
@@ -200,7 +212,7 @@ function formatFunctionSignature(fn: FileAST["functions"][0]): string {
         })
         .join(", ")
     const returnType = fn.returnType ? `: ${fn.returnType}` : ""
-    return `${asyncPrefix}${fn.name}(${params})${returnType}`
+    return `${decoratorsPrefix}${asyncPrefix}${fn.name}(${params})${returnType}`
 }
 
 /**
@@ -310,9 +322,10 @@ function formatFileSummary(
 
     if (ast.classes.length > 0) {
         for (const cls of ast.classes) {
+            const decoratorsPrefix = formatDecoratorsPrefix(cls.decorators)
             const ext = cls.extends ? ` extends ${cls.extends}` : ""
             const impl = cls.implements.length > 0 ? ` implements ${cls.implements.join(", ")}` : ""
-            lines.push(`- class ${cls.name}${ext}${impl}`)
+            lines.push(`- ${decoratorsPrefix}class ${cls.name}${ext}${impl}`)
         }
     }
 

packages/ipuaro/tests/unit/infrastructure/indexer/ASTParser.test.ts

@@ -696,4 +696,140 @@ third: value3`
             expect(ast.enums).toHaveLength(0)
         })
     })
+
+    describe("decorators (0.24.4)", () => {
+        it("should extract class decorator", () => {
+            const code = `@Controller('users')
+class UserController {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].decorators).toHaveLength(1)
+            expect(ast.classes[0].decorators[0]).toBe("@Controller('users')")
+        })
+
+        it("should extract multiple class decorators", () => {
+            const code = `@Controller('api')
+@Injectable()
+@UseGuards(AuthGuard)
+class ApiController {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].decorators).toHaveLength(3)
+            expect(ast.classes[0].decorators[0]).toBe("@Controller('api')")
+            expect(ast.classes[0].decorators[1]).toBe("@Injectable()")
+            expect(ast.classes[0].decorators[2]).toBe("@UseGuards(AuthGuard)")
+        })
+
+        it("should extract method decorators", () => {
+            const code = `class UserController {
+    @Get(':id')
+    @Auth()
+    async getUser() {}
+}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].methods).toHaveLength(1)
+            expect(ast.classes[0].methods[0].decorators).toHaveLength(2)
+            expect(ast.classes[0].methods[0].decorators[0]).toBe("@Get(':id')")
+            expect(ast.classes[0].methods[0].decorators[1]).toBe("@Auth()")
+        })
+
+        it("should extract exported decorated class", () => {
+            const code = `@Injectable()
+export class UserService {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].isExported).toBe(true)
+            expect(ast.classes[0].decorators).toHaveLength(1)
+            expect(ast.classes[0].decorators[0]).toBe("@Injectable()")
+        })
+
+        it("should extract decorator with complex arguments", () => {
+            const code = `@Module({
+    imports: [UserModule],
+    controllers: [AppController],
+    providers: [AppService]
+})
+class AppModule {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].decorators).toHaveLength(1)
+            expect(ast.classes[0].decorators[0]).toContain("@Module")
+            expect(ast.classes[0].decorators[0]).toContain("imports")
+        })
+
+        it("should extract decorated class with extends", () => {
+            const code = `@Entity()
+class User extends BaseEntity {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].extends).toBe("BaseEntity")
+            expect(ast.classes[0].decorators).toHaveLength(1)
+            expect(ast.classes[0].decorators![0]).toBe("@Entity()")
+        })
+
+        it("should handle class without decorators", () => {
+            const code = `class SimpleClass {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].decorators).toHaveLength(0)
+        })
+
+        it("should handle method without decorators", () => {
+            const code = `class SimpleClass {
+    simpleMethod() {}
+}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].methods).toHaveLength(1)
+            expect(ast.classes[0].methods[0].decorators).toHaveLength(0)
+        })
+
+        it("should handle function without decorators", () => {
+            const code = `function simpleFunc() {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.functions).toHaveLength(1)
+            expect(ast.functions[0].decorators).toHaveLength(0)
+        })
+
+        it("should handle arrow function without decorators", () => {
+            const code = `const arrowFn = () => {}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.functions).toHaveLength(1)
+            expect(ast.functions[0].decorators).toHaveLength(0)
+        })
+
+        it("should extract NestJS controller pattern", () => {
+            const code = `@Controller('users')
+export class UserController {
+    @Get()
+    findAll() {}
+
+    @Get(':id')
+    findOne() {}
+
+    @Post()
+    @Body()
+    create() {}
+}`
+            const ast = parser.parse(code, "ts")
+
+            expect(ast.classes).toHaveLength(1)
+            expect(ast.classes[0].decorators).toContain("@Controller('users')")
+            expect(ast.classes[0].methods).toHaveLength(3)
+            expect(ast.classes[0].methods[0].decorators).toContain("@Get()")
+            expect(ast.classes[0].methods[1].decorators).toContain("@Get(':id')")
+            expect(ast.classes[0].methods[2].decorators).toContain("@Post()")
+        })
+    })
 })

packages/ipuaro/tests/unit/infrastructure/llm/prompts.test.ts

@@ -1773,4 +1773,244 @@ describe("prompts", () => {
             expect(context).toContain("- enum VeryLongEnumName")
         })
     })
+
+    describe("decorators (0.24.4)", () => {
+        it("should format function with decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["controller.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "controller.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [
+                            {
+                                name: "getUser",
+                                lineStart: 1,
+                                lineEnd: 5,
+                                params: [
+                                    {
+                                        name: "id",
+                                        type: "string",
+                                        optional: false,
+                                        hasDefault: false,
+                                    },
+                                ],
+                                isAsync: true,
+                                isExported: true,
+                                returnType: "Promise<User>",
+                                decorators: ["@Get(':id')"],
+                            },
+                        ],
+                        classes: [],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain("- @Get(':id') async getUser(id: string): Promise<User>")
+        })
+
+        it("should format class with decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["controller.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "controller.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [],
+                        classes: [
+                            {
+                                name: "UserController",
+                                lineStart: 1,
+                                lineEnd: 20,
+                                methods: [],
+                                properties: [],
+                                implements: [],
+                                isExported: true,
+                                isAbstract: false,
+                                decorators: ["@Controller('users')"],
+                            },
+                        ],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain("- @Controller('users') class UserController")
+        })
+
+        it("should format class with multiple decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["service.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "service.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [],
+                        classes: [
+                            {
+                                name: "UserService",
+                                lineStart: 1,
+                                lineEnd: 30,
+                                methods: [],
+                                properties: [],
+                                implements: ["IUserService"],
+                                isExported: true,
+                                isAbstract: false,
+                                decorators: ["@Injectable()", "@Singleton()"],
+                            },
+                        ],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain(
+                "- @Injectable() @Singleton() class UserService implements IUserService",
+            )
+        })
+
+        it("should format function with multiple decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["controller.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "controller.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [
+                            {
+                                name: "createUser",
+                                lineStart: 1,
+                                lineEnd: 10,
+                                params: [],
+                                isAsync: true,
+                                isExported: true,
+                                decorators: ["@Post()", "@Auth()", "@ValidateBody()"],
+                            },
+                        ],
+                        classes: [],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain("- @Post() @Auth() @ValidateBody() async createUser()")
+        })
+
+        it("should handle function without decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["utils.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "utils.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [
+                            {
+                                name: "helper",
+                                lineStart: 1,
+                                lineEnd: 5,
+                                params: [],
+                                isAsync: false,
+                                isExported: true,
+                            },
+                        ],
+                        classes: [],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain("- helper()")
+            expect(context).not.toContain("@")
+        })
+
+        it("should handle class without decorators", () => {
+            const structure: ProjectStructure = {
+                name: "test",
+                rootPath: "/test",
+                files: ["simple.ts"],
+                directories: [],
+            }
+            const asts = new Map<string, FileAST>([
+                [
+                    "simple.ts",
+                    {
+                        imports: [],
+                        exports: [],
+                        functions: [],
+                        classes: [
+                            {
+                                name: "SimpleClass",
+                                lineStart: 1,
+                                lineEnd: 10,
+                                methods: [],
+                                properties: [],
+                                implements: [],
+                                isExported: true,
+                                isAbstract: false,
+                            },
+                        ],
+                        interfaces: [],
+                        typeAliases: [],
+                        parseError: false,
+                    },
+                ],
+            ])
+
+            const context = buildInitialContext(structure, asts)
+
+            expect(context).toContain("- class SimpleClass")
+            expect(context).not.toContain("@")
+        })
+    })
 })