augwa
diff --git a/‎README.md‎
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diff --git a/‎docs/CONTRIBUTING.md‎
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diff --git a/‎docs/openapi-fetch/api.md‎
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diff --git a/‎package.json‎
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diff --git a/‎packages/openapi-fetch/.npmignore‎
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diff --git a/‎packages/openapi-fetch/CHANGELOG.md‎
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diff --git a/‎packages/openapi-fetch/build.config.ts‎
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diff --git a/‎packages/openapi-fetch/examples/vue-3/tsconfig.node.json‎
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diff --git a/‎packages/openapi-fetch/package.json‎
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diff --git a/‎packages/openapi-fetch/src/index.js‎
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@@ -18,7 +18,7 @@ Ultra-fast fetching for TypeScript generated automatically from your OpenAPI sch
 
 <p align="center">
   <a href="https://zuplo.link/openapi-ts-gh"><img width="288" height="120" alt="Zuplo" src="./docs/public/assets/zuplo.svg"></a>
-  <a href="https://www.speakeasy.com/product/sdk-generation?utm_source=pow_openapi_ts" target="_blank"><img width="288" height="120" src="./docs/public/assets/speakeasy.svg" /></a>
+  <a href="https://www.speakeasy.com/editor?utm_source=pow_openapi_ts" target="_blank"><img width="288" height="120" src="./docs/public/assets/speakeasy.svg" /></a>
 </p>
 
 ### 🥈 Silver Sponsors
 
@@ -24,4 +24,4 @@ All of the above are welcome! But if you just opened a PR without discussing the
 
 ## Code of Conduct
 
-All docs edits are held accountable to the [Code of Conduct](../../CODE_OF_CONDUCT.md) outlined in this project. Language in the documentation must be inclusive, kind, and respectful.
+All docs edits are held accountable to the [Code of Conduct](../CODE_OF_CONDUCT.md) outlined in this project. Language in the documentation must be inclusive, kind, and respectful.
@@ -192,6 +192,22 @@ or when instantiating the client.
 
 :::
 
+### URL-encoded body
+
+To send a body request in `application/x-www-form-urlencoded` format, which is commonly used to transmit key-value pairs in APIs like OAuth 2.0, pass the appropriate header and body as an object. `openapi-fetch` will automatically encode the body to the correct format.
+
+```ts
+const { data, error } = await client.POST("/tokens", {
+  body: {
+    clientId: "someClientId",
+    clientSecret: "someClientSecret",
+  },
+  headers: {
+    "Content-Type": "application/x-www-form-encoded",
+  },
+});
+```
+
 ## Path serialization
 
 openapi-fetch supports path serialization as [outlined in the 3.1 spec](https://swagger.io/docs/specification/serialization/#path). This happens automatically, based on the specific format in your OpenAPI schema:
 
@@ -19,22 +19,23 @@
     "version": "pnpm run build && changeset version && pnpm i"
   },
   "devDependencies": {
+    "@arethetypeswrong/cli": "^0.18.1",
     "@biomejs/biome": "^1.9.4",
     "@changesets/changelog-github": "^0.5.1",
     "@changesets/cli": "^2.29.2",
     "@playwright/test": "^1.52.0",
     "@size-limit/preset-small-lib": "^11.2.0",
     "@types/node": "^22.15.3",
-    "del-cli": "^6.0.0",
     "prettier": "^3.5.3",
     "size-limit": "^11.2.0",
     "turbo": "^2.5.2",
     "typescript": "^5.8.3",
-    "vitest": "^2.1.9"
+    "unbuild": "^3.5.0",
+    "vitest": "^3.1.3"
   },
   "size-limit": [
     {
-      "path": "packages/openapi-fetch/dist/index.min.js",
+      "path": "packages/openapi-fetch/dist/index.mjs",
       "limit": "7 kB",
       "brotli": false
     }
 
@@ -1,4 +1,5 @@
 .turbo
+*.config.*
 examples
 test
 test-results
 
@@ -1,5 +1,19 @@
 # openapi-fetch
 
+## 0.14.0
+
+### Minor Changes
+
+- [#2310](https://github.com/openapi-ts/openapi-typescript/pull/2310) [`e66b5ce`](https://github.com/openapi-ts/openapi-typescript/commit/e66b5ce63bfcdc57c6ee942e5ed4e7667e64c290) Thanks [@drwpow](https://github.com/drwpow)! - Build package with unbuild. Also remove the minified version (openapi-fetch is only useful in a TypeScript/bundler environment, so there’s no sense in loading it from a CDN clientside).
+
+## 0.13.8
+
+### Patch Changes
+
+- [#2096](https://github.com/openapi-ts/openapi-typescript/pull/2096) [`0058128`](https://github.com/openapi-ts/openapi-typescript/commit/0058128afa258180793ae2071022d89a688d8ddc) Thanks [@obulat](https://github.com/obulat)! - Encode the request body if `Content-Type` header is `x-www-form-urlencoded`
+- [#2157](https://github.com/openapi-ts/openapi-typescript/pull/2157) [`419d9ac`](https://github.com/openapi-ts/openapi-typescript/commit/419d9ac6851cf780b81060ddc05c231c5225a17b) Thanks [@Rendez](https://github.com/Rendez)! - Fix overriding baseUrl per request without overriding default baseUrl
+- [#2308](https://github.com/openapi-ts/openapi-typescript/pull/2308) [`81c031d`](https://github.com/openapi-ts/openapi-typescript/commit/81c031da8584ed49b033ebfc67bbb3e1ca258699) Thanks [@drwpow](https://github.com/drwpow)! - Improve header handling
+
 ## 0.13.7
 
 ### Patch Changes
 
@@ -0,0 +1,12 @@
+import { defineBuildConfig } from "unbuild";
+
+export default defineBuildConfig({
+  entries: ["./src/index.js"],
+  declaration: "compatible",
+  clean: true,
+  sourcemap: true,
+  rollup: {
+    // Ship CommonJS-compatible bundle
+    emitCJS: true,
+  },
+});
@@ -11,7 +11,6 @@
     "composite": true,
     "noEmit": true,
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
-
     "module": "ESNext",
     "moduleResolution": "Bundler",
     "types": ["node"]
 
@@ -1,26 +1,19 @@
 {
   "name": "@augwa/openapi-fetch",
   "description": "Fast, type-safe fetch client for your OpenAPI schema. Only 6 kb (min). Works with React, Vue, Svelte, or vanilla JS.",
-  "version": "0.13.7",
+  "version": "0.14.0",
   "author": {
     "name": "Drew Powers",
     "email": "[email protected]"
   },
   "license": "MIT",
   "type": "module",
-  "main": "./dist/index.js",
-  "module": "./dist/index.js",
-  "types": "./dist/index.d.ts",
+  "main": "./dist/index.mjs",
   "exports": {
     ".": {
-      "import": {
-        "types": "./dist/index.d.ts",
-        "default": "./dist/index.js"
-      },
-      "require": {
-        "types": "./dist/cjs/index.d.cts",
-        "default": "./dist/cjs/index.cjs"
-      }
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs",
+      "default": "./dist/index.mjs"
     },
     "./*": "./*"
   },
@@ -47,19 +40,18 @@
     "svelte"
   ],
   "scripts": {
-    "build": "pnpm run build:clean && pnpm run build:js && pnpm run build:js-min && pnpm run build:cjs",
-    "build:clean": "del-cli dist",
-    "build:js": "mkdir -p dist && cp src/* dist",
-    "build:js-min": "esbuild --bundle src/index.js --format=esm --minify --outfile=dist/index.min.js && cp dist/index.d.ts dist/index.min.d.ts",
-    "build:cjs": "esbuild --bundle src/index.js --format=cjs --outfile=dist/cjs/index.cjs && cp dist/index.d.ts dist/cjs/index.d.cts",
+    "build": "unbuild",
     "format": "biome format . --write",
-    "lint": "biome check .",
+    "lint": "pnpm run lint:js && pnpm run lint:ts && pnpm run lint:ts-no-strict",
+    "lint:js": "biome check .",
+    "lint:ts": "tsc --noEmit",
+    "lint:ts-no-strict": "tsc --noEmit -p test/no-strict-null-checks/tsconfig.json",
     "generate-types": "openapi-typescript -c test/redocly.yaml",
+    "prepack": "pnpm run build",
     "pretest": "pnpm run generate-types",
-    "test": "pnpm run \"/^test:/\"",
+    "test": "pnpm run test:js && pnpm run test:exports",
     "test:js": "vitest run",
-    "test:ts": "tsc --noEmit",
-    "test:ts-no-strict": "tsc --noEmit -p test/no-strict-null-checks/tsconfig.json",
+    "test:exports": "pnpm run build && attw --pack .",
     "test-e2e": "playwright test",
     "bench:js": "vitest bench",
     "e2e-vite-build": "vite build test/e2e/app",
@@ -71,8 +63,6 @@
   },
   "devDependencies": {
     "axios": "^1.9.0",
-    "del-cli": "^6.0.0",
-    "esbuild": "^0.25.3",
     "execa": "^9.5.2",
     "express": "^5.0.0",
     "feature-fetch": "^0.0.43",
 
@@ -54,8 +54,9 @@ export default function createClient(clientOptions) {
       body,
       ...init
     } = fetchOptions || {};
+    let finalBaseUrl = baseUrl;
     if (localBaseUrl) {
-      baseUrl = removeTrailingSlash(localBaseUrl);
+      finalBaseUrl = removeTrailingSlash(localBaseUrl) ?? baseUrl;
     }
 
     let querySerializer =
@@ -72,29 +73,46 @@ export default function createClient(clientOptions) {
             });
     }
 
-    const serializedBody = body === undefined ? undefined : bodySerializer(body);
-
-    const defaultHeaders =
+    const serializedBody =
+      body === undefined
+        ? undefined
+        : bodySerializer(
+            body,
+            // Note: we declare mergeHeaders() both here and below because it’s a bit of a chicken-or-egg situation:
+            // bodySerializer() needs all headers so we aren’t dropping ones set by the user, however,
+            // the result of this ALSO sets the lowest-priority content-type header. So we re-merge below,
+            // setting the content-type at the very beginning to be overwritten.
+            // Lastly, based on the way headers work, it’s not a simple “present-or-not” check becauase null intentionally un-sets headers.
+            mergeHeaders(baseHeaders, headers, params.header),
+          );
+    const finalHeaders = mergeHeaders(
       // with no body, we should not to set Content-Type
       serializedBody === undefined ||
-      // if serialized body is FormData; browser will correctly set Content-Type & boundary expression
-      serializedBody instanceof FormData
+        // if serialized body is FormData; browser will correctly set Content-Type & boundary expression
+        serializedBody instanceof FormData
         ? {}
         : {
             "Content-Type": "application/json",
-          };
+          },
+      baseHeaders,
+      headers,
+      params.header,
+    );
 
     const requestInit = {
       redirect: "follow",
       ...baseOptions,
       ...init,
       body: serializedBody,
-      headers: mergeHeaders(defaultHeaders, baseHeaders, headers, params.header),
+      headers: finalHeaders,
     };
 
     let id;
     let options;
-    let request = new CustomRequest(createFinalURL(schemaPath, { baseUrl, params, querySerializer }), requestInit);
+    let request = new CustomRequest(
+      createFinalURL(schemaPath, { baseUrl: finalBaseUrl, params, querySerializer }),
+      requestInit,
+    );
     let response;
 
     /** Add custom parameters to Request object */
@@ -109,7 +127,7 @@ export default function createClient(clientOptions) {
 
       // middleware (request)
       options = Object.freeze({
-        baseUrl,
+        baseUrl: finalBaseUrl,
         fetch,
         parseAs,
         querySerializer,
@@ -574,10 +592,19 @@ export function defaultPathSerializer(pathname, pathParams) {
  * Serialize body object to string
  * @type {import("./index.js").defaultBodySerializer}
  */
-export function defaultBodySerializer(body) {
+export function defaultBodySerializer(body, headers) {
   if (body instanceof FormData) {
     return body;
   }
+  if (headers) {
+    const contentType =
+      headers.get instanceof Function
+        ? (headers.get("Content-Type") ?? headers.get("content-type"))
+        : (headers["Content-Type"] ?? headers["content-type"]);
+    if (contentType === "application/x-www-form-urlencoded") {
+      return new URLSearchParams(body).toString();
+    }
+  }
   return JSON.stringify(body);
 }
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`@@ -24,4 +24,4 @@ All of the above are welcome! But if you just opened a PR without discussing the`
`24`	`24`
`25`	`25`	`## Code of Conduct`
`26`	`26`
`27`		`-All docs edits are held accountable to the [Code of Conduct](../../CODE_OF_CONDUCT.md) outlined in this project. Language in the documentation must be inclusive, kind, and respectful.`
	`27`	`+All docs edits are held accountable to the [Code of Conduct](../CODE_OF_CONDUCT.md) outlined in this project. Language in the documentation must be inclusive, kind, and respectful.`
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`@@ -1,4 +1,5 @@`
`1`	`1`	`.turbo`
	`2`	`+.config.`
`2`	`3`	`examples`
`3`	`4`	`test`
`4`	`5`	`test-results`