Add tuple support (#293)

Author: Mause

src/utils.ts

@@ -105,6 +105,11 @@ export function tsArrayOf(type: string): string {
   return `(${type})[]`;
 }
 
+/** Convert array of types into [T, A, B, ...] */
+export function tsTupleOf(types: string[]): string {
+  return `[${types.join(", ")}]`;
+}
+
 /** Convert T, U into T & U; */
 export function tsIntersectionOf(types: string[]): string {
   return `(${types.join(") & (")})`;

src/v3.ts

@@ -8,6 +8,7 @@ import {
   tsIntersectionOf,
   tsPartial,
   tsUnionOf,
+  tsTupleOf,
 } from "./utils";
 
 export const PRIMITIVES: { [key: string]: "boolean" | "string" | "number" } = {
@@ -92,7 +93,11 @@ export default function generateTypesV3(
         ]);
       }
       case "array": {
-        return tsArrayOf(transform(node.items as any));
+        if (Array.isArray(node.items)) {
+          return tsTupleOf(node.items.map(transform));
+        } else {
+          return tsArrayOf(transform(node.items as any));
+        }
       }
     }
 

tests/v3/index.test.ts

@@ -210,6 +210,13 @@ describe("types", () => {
           inferred_array: {
             items: { $ref: "#/components/schemas/array" },
           },
+          tuple: {
+            type: "array",
+            items: [
+              { type: "string" },
+              { type: "number" }
+            ]
+          },
           nullable: {
             type: "array",
             items: { type: "string" },
@@ -232,6 +239,7 @@ describe("types", () => {
           string: string;
           array_ref: components['schemas']['array'][];
           inferred_array: components['schemas']['array'][];
+          tuple: [string, number];
           nullable: string[] | null;
         }
       }`)