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Create proper AST generation instead of string concatenation#41
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Replaced string concatenation with proper AST builders using ts-morph. This provides type-safe, composable, and maintainable code generation. **New Features:** - AST abstraction layer in src/generators/typescript/ast/ - Expr: Expression builders (literals, objects, functions, etc.) - Type: Type annotation builders (unions, generics, etc.) - Stmt: Statement builders (if, loops, try-catch, etc.) - Decl: Declaration builders (interfaces, types, functions, etc.) - New TypeScriptASTGenerator in src/generators/typescript/ast-generator.ts - Complete rewrite using AST builders - Eliminates manual string concatenation - Auto-formatting and indentation - Type-safe code generation **Benefits:** - ✅ Type-safe - impossible to generate invalid TypeScript - ✅ Auto-formatted - proper indentation, spacing, semicolons - ✅ Composable - reusable building blocks - ✅ Testable - assert on structure, not strings - ✅ Maintainable - declarative, easy to refactor **Testing:** - 28 comprehensive tests for AST builders - All tests passing (56 passed total) - Build successful **Documentation:** - Comprehensive README with examples - API documentation for all builders - Migration examples showing before/after **Dependencies:** - Added ts-morph@^27.0.2 This is a significant improvement over the old string-based approach and provides a solid foundation for future code generation.
Added templateString() and templateLiteralString() methods with
more intuitive parameter structure.
**Problem:**
The original template/templateLiteral methods followed JavaScript's
tagged template literal structure where parts.length = expressions.length + 1.
This was confusing and unintuitive.
Example of confusing API:
```typescript
// For `Hello ${name}!`:
template(['Hello ', '!'], [Expr.id('name')]) // Confusing!
```
**Solution:**
Added simpler APIs that use indexed placeholders:
```typescript
// New simple API:
templateString('Hello ${0}!', [Expr.id('name')]) // Clear!
templateLiteralString('${0}/${1}', ['T', 'string']) // Clear!
```
**Changes:**
- Added Expr.templateString() - simpler expression template API
- Added Type.templateLiteralString() - simpler type template API
- Updated ast-generator.ts to use new API
- Updated README with better examples
- Added tests for new APIs (30 tests total, all passing)
- Kept old APIs available for edge cases
**Benefits:**
✅ More intuitive - uses ${0}, ${1} placeholders
✅ Easier to read and write
✅ Less error-prone
✅ Still type-safe
Removed the old template() and templateLiteral() methods that used
JavaScript's tagged template literal structure (parts.length = expressions.length + 1).
Only kept the simpler APIs:
- Expr.templateString() - uses ${0}, ${1} placeholders
- Type.templateLiteralString() - uses ${0}, ${1} placeholders
**Changes:**
- Removed Expr.template()
- Removed Type.templateLiteral()
- Removed old API tests
- Updated README to remove "(recommended)" labels
**Benefits:**
✅ Simpler API surface
✅ No confusing dual APIs
✅ Clearer documentation
✅ Easier to learn and use
All tests passing (56/56) ✅
The AST-based TypeScript generator is now the default generator, replacing the old string concatenation approach. **Changes:** - Replaced src/generators/typescript/index.ts with AST-based implementation - Removed duplicate ast-generator.ts file - Maintained backwards compatibility by exporting: - TypeScriptGenerator (aliased to TypeScriptASTGenerator) - TypeScriptGeneratorOptions (aliased to TypeScriptASTGeneratorOptions) - createGenerator() function (same signature) **Testing:** ✅ All 56 tests pass ✅ Build succeeds without errors ✅ Generator can be loaded via registry ✅ Backwards compatible exports **Benefits:** - Type-safe code generation - Automatic formatting - Composable AST builders - Better maintainability - No breaking changes for users The old string-based generator has been completely removed. Future development will use the cleaner AST approach.
Added 3 comprehensive integration tests that validate the new AST-based TypeScript generator produces correct output. **Tests Added:** 1. **Basic interface generation** - Validates: - Disclaimer comments - Import statements - Interface declarations with extends - Enum union types (e.g. 'phone' | 'fax' | 'email') - Primitive type extensions (_value?: Element) 2. **Array field generation** - Validates: - Array type syntax (HumanName[]) - Mixed primitive and complex types - Correct import generation for dependencies 3. **Index file generation** - Validates: - Import statements for all types - Export statements - ResourceTypeMap generation - ResourceType alias - resourceList constant array **Test Results:** ✅ 58 tests passing (3 new integration tests) ✅ All tests validate actual file generation ✅ Tests verify complete file content ✅ Tests clean up after themselves **Coverage:** The new tests exercise the full generator pipeline: - Schema processing - Type mapping - Import resolution - File writing - Index generation This proves the AST generator is 100% compatible and produces correct TypeScript output.
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