fix(RequestInit): restrict body type based on method to improve type safety

Author: Bashamega

baselines/dom.generated.d.ts

@@ -1953,7 +1953,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/serviceworker.generated.d.ts

@@ -560,7 +560,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/sharedworker.generated.d.ts

@@ -494,7 +494,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/ts5.5/dom.generated.d.ts

@@ -1953,7 +1953,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/ts5.5/serviceworker.generated.d.ts

@@ -560,7 +560,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/ts5.5/sharedworker.generated.d.ts

@@ -494,7 +494,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/ts5.5/webworker.generated.d.ts

@@ -702,7 +702,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

baselines/webworker.generated.d.ts

@@ -702,7 +702,7 @@ interface ReportingObserverOptions {
 
 interface RequestInit {
     /** A BodyInit object or null to set request's body. */
-    body?: BodyInit | null;
+    body?: 'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null | null;
     /** A string indicating how the request will interact with the browser's cache to set request's cache. */
     cache?: RequestCache;
     /** A string indicating whether credentials will be sent with the request always, never, or only when sent to a same-origin URL. Sets request's credentials. */

inputfiles/overridingTypes.jsonc

@@ -3924,6 +3924,9 @@
                     "member": {
                         "window": {
                             "overrideType": "null"
+                        },
+                        "body": {
+                            "overrideType": "'GET' | 'HEAD' extends this['method'] ? never : BodyInit | null"
                         }
                     }
                 }