Fix NPM build for Typescript-fetch (#3403)

* -Fix bug in fetch -> Missing "runtime"
-Move fetch files to an "src" folder instead of doing everything at the root which removes the bugs when using the library itself
-Fix the distribution of fetch using npm

* Move the .ts files to an `src` folder which is more common in npm package

* Add missing mustache

* Add missing .npmignore

Author: JFCote

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java

@@ -50,9 +50,9 @@ public TypeScriptFetchClientCodegen() {
         outputFolder = "generated-code/typescript-fetch";
         embeddedTemplateDir = templateDir = "typescript-fetch";
 
-        this.apiPackage = "apis";
+        this.apiPackage = "src" + File.separator +"apis";
+        this.modelPackage = "src" + File.separator + "models";
         this.apiTemplateFiles.put("apis.mustache", ".ts");
-        this.modelPackage = "models";
         this.modelTemplateFiles.put("models.mustache", ".ts");
         this.addExtraReservedWords();
 
@@ -84,8 +84,8 @@ public void processOpts() {
         super.processOpts();
         additionalProperties.put("isOriginalModelPropertyNaming", getModelPropertyNaming().equals("original"));
         additionalProperties.put("modelPropertyNaming", getModelPropertyNaming());
-        supportingFiles.add(new SupportingFile("index.mustache", "", "index.ts"));
-        supportingFiles.add(new SupportingFile("runtime.mustache", "", "runtime.ts"));
+        supportingFiles.add(new SupportingFile("index.mustache", "src", "index.ts"));
+        supportingFiles.add(new SupportingFile("runtime.mustache", "src", "runtime.ts"));
         supportingFiles.add(new SupportingFile("tsconfig.mustache", "", "tsconfig.json"));
         supportingFiles.add(new SupportingFile("gitignore", "", ".gitignore"));
 
@@ -188,6 +188,7 @@ private void addNpmPackageGeneration() {
         //Files for building our lib
         supportingFiles.add(new SupportingFile("README.mustache", "", "README.md"));
         supportingFiles.add(new SupportingFile("package.mustache", "", "package.json"));
+        supportingFiles.add(new SupportingFile("npmignore.mustache", "", ".npmignore"));
     }
 
     @Override
@@ -216,7 +217,7 @@ private void addOperationModelImportInfomation(Map<String, Object> operations) {
         // models for a given operation.
         List<Map<String, Object>> imports = (List<Map<String, Object>>) operations.get("imports");
         for (Map<String, Object> im : imports) {
-            im.put("className", im.get("import").toString().replace("models.", ""));
+            im.put("className", im.get("import").toString().replace(modelPackage() + ".", ""));
         }
     }
 

modules/openapi-generator/src/main/resources/typescript-fetch/npmignore.mustache

@@ -0,0 +1 @@
+README.md

modules/openapi-generator/src/main/resources/typescript-fetch/package.mustache

@@ -6,7 +6,7 @@
   "main": "./dist/index.js",
   "typings": "./dist/index.d.ts",
   "scripts" : {
-    "build": "tsc --outDir dist/",
+    "build": "tsc",
     "prepare": "npm run build"
   },
   "devDependencies": {

modules/openapi-generator/src/main/resources/typescript-fetch/tsconfig.mustache

@@ -5,7 +5,6 @@
     "module": "commonjs",
     "moduleResolution": "node",
     "outDir": "dist",
-    "rootDir": ".",
     {{^supportsES6}}
     "lib": [
       "es6",