Add asNonEmptyTuple config option for typescript-enum-array plugin

packages/plugins/typescript/enum-array/src/config.ts

@@ -14,4 +14,9 @@ export interface EnumArrayPluginConfig extends RawTypesConfig {
    * @description use enum members instead of string literals. Defaults to false
    */
   useMembers?: boolean;
+  /**
+   * @description generate non-empty tuple types [EnumType, ...EnumType[]] instead of EnumType[].
+   * Preserves original enum type in Zod parsed schemas. Defaults to false
+   */
+  asNonEmptyTuple?: boolean;
 }

packages/plugins/typescript/enum-array/src/index.ts

@@ -39,6 +39,8 @@ function buildArrayDefinition(e: GraphQLEnumType, config: EnumArrayPluginConfig)
 
   if (config.constArrays) {
     return `export const ${upperName} = [${values}] as const;`;
+  } else if (config.asNonEmptyTuple) {
+    return `export const ${upperName}: [${enumName}, ...${enumName}[]] = [${values}];`;
   } else {
     return `export const ${upperName}: ${enumName}[] = [${values}];`;
   }

packages/plugins/typescript/enum-array/tests/enum-array.spec.ts

@@ -136,4 +136,47 @@ describe('TypeScript', () => {
       `);
     });
   });
+
+  describe('with asNonEmptyTuple', () => {
+    it('Should declare the array as a non-empty tuple', async () => {
+      const schema = buildSchema(/* GraphQL */ `
+        "custom enum"
+        enum MyEnum {
+          "this is a"
+          A
+          "this is b"
+          B
+        }
+      `);
+      const result = (await plugin(schema, [], {
+        asNonEmptyTuple: true,
+      })) as Types.ComplexPluginOutput;
+
+      expect(result.prepend).toBeSimilarStringTo(``);
+      expect(result.content).toBeSimilarStringTo(`
+        export const MY_ENUM: [MyEnum, ...MyEnum[]] = ['A', 'B'];
+      `);
+    });
+
+    it('Should be ignored when constArrays is true', async () => {
+      const schema = buildSchema(/* GraphQL */ `
+        "custom enum"
+        enum MyEnum {
+          "this is a"
+          A
+          "this is b"
+          B
+        }
+      `);
+      const result = (await plugin(schema, [], {
+        asNonEmptyTuple: true,
+        constArrays: true,
+      })) as Types.ComplexPluginOutput;
+
+      expect(result.prepend).toBeSimilarStringTo(``);
+      expect(result.content).toBeSimilarStringTo(`
+        export const MY_ENUM = ['A', 'B'] as const;
+      `);
+    });
+  });
 });