fix: handle enums with booleans

Author: mdevils

README.md

@@ -11,6 +11,7 @@ A powerful, highly customizable TypeScript client generator for OpenAPI specific
 - **Production-ready**: Used to build enterprise-grade API clients for Atlassian products
 - **Flexible schema loading**: Load schemas from YAML or JSON, locally or remotely
 - **Modern specification support**: Full support for OpenAPI 3.0 and 3.1
+- **Zero runtime dependencies**: Generated code has no external dependencies unless explicitly configured
 
 ## Real-world Examples
 

src/schema-to-typescript/common.ts

@@ -46,6 +46,7 @@ import {
     OpenApiSchema,
     OpenApiSchemaPrimitiveValue
 } from '../schemas/common';
+import {cleanupSchema} from '../utils/cleanup-schema';
 import {attachJsDocComment, extractJsDoc, JsDocBlock, JsDocRenderConfig, renderJsDoc} from '../utils/jsdoc';
 import {applyEntityNameCase} from '../utils/string-utils';
 import {simplifyIntersectionTypeIfPossible, simplifyUnionTypeIfPossible} from '../utils/type-utils';
@@ -65,14 +66,15 @@ export interface GenerateSchemaTypeParams {
  * @see https://www.asyncapi.com/docs/specifications/2.0.0#dataTypeFormat
  */
 export function generateSchemaType({
-    schema,
+    schema: originalSchema,
     getTypeName,
     expand = false,
     processJsDoc,
     processJsDocPath,
     getBinaryType,
     jsDocRenderConfig
 }: GenerateSchemaTypeParams): TSType {
+    const schema = cleanupSchema(originalSchema);
     const commonSchemaGenerationOptions = {
         getTypeName,
         getBinaryType,

src/schema-to-typescript/common/validation-providers/zod-validation-provider/index.ts

@@ -31,6 +31,7 @@ import {
 } from '@babel/types';
 import * as R from 'ramda';
 import {extendSchema, OpenApiSchema} from '../../../../schemas/common';
+import {cleanupSchema} from '../../../../utils/cleanup-schema';
 import {addDependencyImport, DependencyImports} from '../../../../utils/dependencies';
 import {isJsonMediaType} from '../../../../utils/media-types';
 import {objectPropertyKey, valueToAstExpression} from '../../../common';
@@ -121,7 +122,8 @@ export class ZodValidationProvider extends ValidationProvider {
     generateSchema(schema: OpenApiSchema, context: ValidationProviderContext): ResultWithDependencyImports<Expression> {
         return this.withDependencyImports(this.generateSchemaItem(schema, context));
     }
-    protected generateSchemaItem(schema: OpenApiSchema, context: ValidationProviderContext): Expression {
+    protected generateSchemaItem(originalSchema: OpenApiSchema, context: ValidationProviderContext): Expression {
+        const schema = cleanupSchema(originalSchema);
         if (schema === true) {
             return zCall('unknown', []);
         }

src/utils/cleanup-schema.ts

@@ -0,0 +1,29 @@
+import {OpenApiSchema} from '../schemas/common';
+
+/**
+ * Sometimes schemas have unnecessary properties that can be removed to make the schema cleaner.
+ */
+export function cleanupSchema(schema: OpenApiSchema): OpenApiSchema {
+    if (typeof schema === 'boolean') {
+        return schema;
+    }
+    if ('enum' in schema && schema.enum) {
+        const {enum: enumValues, ...rest} = schema;
+        if (enumValues.length === 0) {
+            return rest;
+        }
+        if (enumValues.length === 1) {
+            return {
+                ...rest,
+                const: enumValues[0]
+            };
+        }
+        if (enumValues.length === 2 && enumValues.every((v) => typeof v === 'boolean')) {
+            return {
+                ...rest,
+                type: 'boolean'
+            };
+        }
+    }
+    return schema;
+}