feat: Allow to use strings as header values

Author: jantimon

README.md

@@ -145,10 +145,11 @@ The `headers` option allows to customize request headers.
 const userLoader = createGetEndpoint({
     url: keys => `http://example.com/user/${keys.id}`,
     headers: {
-        keys => { "Authorization": `Bearer ${keys.token}` }
+        Authorization: keys => `Bearer ${keys.token}`,
+        contentType: "application/json"
     }
 });
-userLoader({id: 9, token: 'YXRvYmF0b2JhdG9i'})
+userLoader({ id: 9, token: "YXRvYmF0b2JhdG9i" });
 ```
 
 ## Custom Loaders

core/README.md

@@ -145,10 +145,11 @@ The `headers` option allows to customize request headers.
 const userLoader = createGetEndpoint({
     url: keys => `http://example.com/user/${keys.id}`,
     headers: {
-        keys => { "Authorization": `Bearer ${keys.token}` }
+        Authorization: keys => `Bearer ${keys.token}`,
+        contentType: "application/json"
     }
 });
-userLoader({id: 9, token: 'YXRvYmF0b2JhdG9i'})
+userLoader({ id: 9, token: "YXRvYmF0b2JhdG9i" });
 ```
 
 ## Custom Loaders

core/src/index.ts

@@ -20,7 +20,7 @@ export interface EndpointGetOptions<TKeys, TResult, TKeysBind = TKeys>
 	 * A function to create the url
 	 */
 	url: (keys: TKeysBind) => string;
-	headers?: { [keys: string]: (keys: TKeysBind) => string };
+	headers?: { [keys: string]: string | ((keys: TKeysBind) => string) };
 	/**
 	 * Wether to cache the request - true by default
 	 */
@@ -128,7 +128,7 @@ export interface EndpointPostOptions<TKeys, TBody, TResult, TKeysBind = TKeys>
 	 * A function to create the url
 	 */
 	url: (keys: TKeysBind) => string;
-	headers?: { [keys: string]: (keys: TKeysBind) => string };
+	headers?: { [keys: string]: string | ((keys: TKeysBind) => string) };
 	/**
 	 * A custom loader
 	 */
@@ -184,7 +184,7 @@ export interface EndpointPutOptions<TKeys, TBody, TResult, TKeysBind = TKeys>
 	 * A function to create the url
 	 */
 	url: (keys: TKeysBind) => string;
-	headers?: { [keys: string]: (keys: TKeysBind) => string };
+	headers?: { [keys: string]: string | ((keys: TKeysBind) => string) };
 	/**
 	 * A custom loader
 	 */
@@ -240,7 +240,7 @@ export interface EndpointDeleteOptions<TKeys, TResult, TKeysBind = TKeys>
 	 * A function to create the url
 	 */
 	url: (keys: TKeysBind) => string;
-	headers?: { [keys: string]: (keys: TKeysBind) => string };
+	headers?: { [keys: string]: string | ((keys: TKeysBind) => string) };
 	/**
 	 * A custom loader
 	 */

core/src/lib/Endpoint.ts

@@ -60,7 +60,7 @@ export interface EndpointOptions<TKeys, TBody, TResult, TKeysBind = TKeys> {
 	 * A function to create the url
 	 */
 	url: (keys: TKeysBind) => string;
-	headers?: { [keys: string]: (keys: TKeysBind) => string };
+	headers?: { [keys: string]: string | ((keys: TKeysBind) => string) };
 	/**
 	 * A custom loader
 	 */