functional programming api for typescript-fetch

modules/swagger-codegen/src/main/resources/TypeScript-Fetch/api.mustache

@@ -9,11 +9,18 @@ import * as assign from "core-js/library/fn/object/assign";
 interface Dictionary<T> { [index: string]: T; }
 export interface FetchAPI { (url: string, init?: any): Promise<any>; }
 
+const BASE_PATH = "{{basePath}}";
+
+export interface FetchArgs {
+    url: string;
+    options: any; 
+}
+
 export class BaseAPI {
     basePath: string;
     fetch: FetchAPI;
 
-    constructor(basePath: string = "{{basePath}}", fetch: FetchAPI = isomorphicFetch) {
+    constructor(fetch: FetchAPI = isomorphicFetch, basePath: string = BASE_PATH) {
         this.basePath = basePath;
         this.fetch = fetch;
     }
@@ -51,19 +58,18 @@ export type {{classname}}{{datatypeWithEnum}} = {{#allowableValues}}{{#values}}"
 {{#apis}}
 {{#operations}}
 
-{{#description}}
 /**
-* {{&description}}
-*/
-{{/description}}
-export class {{classname}} extends BaseAPI {
+ * {{classname}} - fetch parameter creator{{#description}}
+ * {{&description}}{{/description}}
+ */
+export const {{classname}}FetchParamCreactor = {
 {{#operation}}
     /** {{#summary}}
      * {{summary}}{{/summary}}{{#notes}}
      * {{notes}}{{/notes}}{{#allParams}}
      * @param {{paramName}} {{description}}{{/allParams}}
      */
-    {{nickname}}({{#hasParams}}params: { {{#allParams}} {{paramName}}{{^required}}?{{/required}}: {{{dataType}}};{{/allParams}} }{{/hasParams}}): Promise<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}any{{/returnType}}> {
+    {{nickname}}({{#hasParams}}params: { {{#allParams}} {{paramName}}{{^required}}?{{/required}}: {{{dataType}}};{{/allParams}} }{{/hasParams}}): FetchArgs {
 {{#allParams}}
 {{#required}}
         // verify required parameter "{{paramName}}" is set
@@ -72,7 +78,7 @@ export class {{classname}} extends BaseAPI {
         }
 {{/required}}
 {{/allParams}}
-        const baseUrl = `${this.basePath}{{path}}`{{#pathParams}}
+        const baseUrl = `{{path}}`{{#pathParams}}
             .replace(`{${"{{baseName}}"}}`, `${ params.{{paramName}} }`){{/pathParams}};
         let urlObj = url.parse(baseUrl, true);
 {{#hasQueryParams}}
@@ -105,13 +111,53 @@ export class {{classname}} extends BaseAPI {
             fetchOptions.headers = contentTypeHeader;
         }
 {{/hasHeaderParam}}
-        return this.fetch(url.format(urlObj), fetchOptions).then((response) => {
-            if (response.status >= 200 && response.status < 300) {
-                return response{{#returnType}}.json(){{/returnType}};
-            } else {
-                throw response;
-            }
-        });
+        return {
+            url: url.format(urlObj),
+            options: fetchOptions,
+        };
+    },
+{{/operation}}
+}
+
+/**
+ * {{classname}} - functional programming interface{{#description}}
+ * {{&description}}{{/description}}
+ */
+export const {{classname}}Fp = {
+{{#operation}}
+    /** {{#summary}}
+     * {{summary}}{{/summary}}{{#notes}}
+     * {{notes}}{{/notes}}{{#allParams}}
+     * @param {{paramName}} {{description}}{{/allParams}}
+     */
+    {{nickname}}({{#hasParams}}params: { {{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}; {{/allParams}} }{{/hasParams}}): (fetch: FetchAPI, basePath?: string) => Promise<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}any{{/returnType}}> {
+        const fetchArgs = {{classname}}FetchParamCreactor.{{nickname}}({{#hasParams}}params{{/hasParams}});
+        return (fetch: FetchAPI = isomorphicFetch, basePath: string = BASE_PATH) => {
+            return fetch(basePath + fetchArgs.url, fetchArgs.options).then((response) => {
+                if (response.status >= 200 && response.status < 300) {
+                    return response{{#returnType}}.json(){{/returnType}};
+                } else {
+                    throw response;
+                }
+            });
+        };
+    },
+{{/operation}}
+};
+
+/**
+ * {{classname}} - object-oriented interface{{#description}}
+ * {{&description}}{{/description}}
+ */
+export class {{classname}} extends BaseAPI {
+{{#operation}}
+    /** {{#summary}}
+     * {{summary}}{{/summary}}{{#notes}}
+     * {{notes}}{{/notes}}{{#allParams}}
+     * @param {{paramName}} {{description}}{{/allParams}}
+     */
+    {{nickname}}({{#hasParams}}params: { {{#allParams}} {{paramName}}{{^required}}?{{/required}}: {{{dataType}}};{{/allParams}} }{{/hasParams}}) {
+        return {{classname}}Fp.{{nickname}}({{#hasParams}}params{{/hasParams}})(this.fetch, this.basePath);
     }
 {{/operation}}
 }

modules/swagger-codegen/src/main/resources/TypeScript-Fetch/tsconfig.json.mustache

@@ -4,7 +4,8 @@
     "target": "{{#supportsES6}}es6{{/supportsES6}}{{^supportsES6}}es5{{/supportsES6}}",
     "module": "commonjs",
     "noImplicitAny": true,
-    "outDir": "dist"
+    "outDir": "dist",
+    "rootDir": "."
   },
   "exclude": [
     "dist",