[typescript-axios][client] Allow apiKey type Promise. (OpenAPITools#5953)

* change apiKey type

* recreate sample

Author: tanmen

modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache

@@ -35,7 +35,7 @@ export const {{classname}}AxiosParamCreator = function (configuration?: Configur
          * @param {*} [options] Override http request option.
          * @throws {RequiredError}
          */
-        {{nickname}}({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options: any = {}): RequestArgs {
+        {{nickname}}: async ({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options: any = {}): Promise<RequestArgs> => {
     {{#allParams}}
     {{#required}}
             // verify required parameter '{{paramName}}' is not null or undefined
@@ -62,16 +62,16 @@ export const {{classname}}AxiosParamCreator = function (configuration?: Configur
             {{#isKeyInHeader}}
             if (configuration && configuration.apiKey) {
                 const localVarApiKeyValue = typeof configuration.apiKey === 'function'
-                    ? configuration.apiKey("{{keyParamName}}")
-                    : configuration.apiKey;
+                    ? await configuration.apiKey("{{keyParamName}}")
+                    : await configuration.apiKey;
                 localVarHeaderParameter["{{keyParamName}}"] = localVarApiKeyValue;
             }
             {{/isKeyInHeader}}
             {{#isKeyInQuery}}
             if (configuration && configuration.apiKey) {
                 const localVarApiKeyValue = typeof configuration.apiKey === 'function'
-                    ? configuration.apiKey("{{keyParamName}}")
-                    : configuration.apiKey;
+                    ? await configuration.apiKey("{{keyParamName}}")
+                    : await configuration.apiKey;
                 localVarQueryParameter["{{keyParamName}}"] = localVarApiKeyValue;
             }
             {{/isKeyInQuery}}
@@ -228,8 +228,8 @@ export const {{classname}}Fp = function(configuration?: Configuration) {
          * @param {*} [options] Override http request option.
          * @throws {RequiredError}
          */
-        {{nickname}}({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options?: any): (axios?: AxiosInstance, basePath?: string) => AxiosPromise<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}> {
-            const localVarAxiosArgs = {{classname}}AxiosParamCreator(configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options);
+        async {{nickname}}({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options?: any): Promise<(axios?: AxiosInstance, basePath?: string) => AxiosPromise<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}>> {
+            const localVarAxiosArgs = await {{classname}}AxiosParamCreator(configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options);
             return (axios: AxiosInstance = globalAxios, basePath: string = BASE_PATH) => {
                 const axiosRequestArgs = {...localVarAxiosArgs.options, url: basePath + localVarAxiosArgs.url};
                 return axios.request(axiosRequestArgs);
@@ -259,7 +259,7 @@ export const {{classname}}Factory = function (configuration?: Configuration, bas
          * @throws {RequiredError}
          */
         {{nickname}}({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options?: any): AxiosPromise<{{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}> {
-            return {{classname}}Fp(configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options)(axios, basePath);
+            return {{classname}}Fp(configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options).then((request) => request(axios, basePath));
         },
     {{/operation}}
     };
@@ -319,7 +319,7 @@ export class {{classname}} extends BaseAPI {
      * @memberof {{classname}}
      */
     public {{nickname}}({{#allParams}}{{paramName}}{{^required}}?{{/required}}: {{{dataType}}}, {{/allParams}}options?: any) {
-        return {{classname}}Fp(this.configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options)(this.axios, this.basePath);
+        return {{classname}}Fp(this.configuration).{{nickname}}({{#allParams}}{{paramName}}, {{/allParams}}options).then((request) => request(this.axios, this.basePath));
     }
 
     {{/operation}}

modules/openapi-generator/src/main/resources/typescript-axios/configuration.mustache

@@ -2,7 +2,7 @@
 {{>licenseInfo}}
 
 export interface ConfigurationParameters {
-    apiKey?: string | ((name: string) => string);
+    apiKey?: string | Promise<string> | ((name: string) => string) | ((name: string) => Promise<string>);
     username?: string;
     password?: string;
     accessToken?: string | ((name?: string, scopes?: string[]) => string);
@@ -16,7 +16,7 @@ export class Configuration {
      * @param name security name
      * @memberof Configuration
      */
-    apiKey?: string | ((name: string) => string);
+    apiKey?: string | Promise<string> | ((name: string) => string) | ((name: string) => Promise<string>);
     /**
      * parameter for basic security
      *