[BUG][Typescript-node] Cannot find name 'RequestFile'

[ryannjohnson]

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?
• [Optional] Bounty to sponsor the fix (example)

Description

RequestFile is defined in the api-all.mustache template, and it gets used as a special case
in the model.mustache template.

When this special case is triggered and RequestFile is used in a model file, Typescript complains that the type is not found.

client/model/inlineObject.ts:15:16 - error TS2304: Cannot find name 'RequestFile'.

15     'myFile'?: RequestFile;
                  ~~~~~~~~~~~

openapi-generator version

4.2.3-SNAPSHOT

OpenAPI declaration file content or url

openapi: 3.0.0
paths:
    '/upload-file':
        post:
            requestBody:
                content:
                    multipart/form-data:
                        schema:
                            type: object
                            properties:
                                myFile:
                                    type: string
                                    format: binary

Command line used for generation

$ ./run-in-docker.sh generate \
      -i swagger.yaml \
      -g typescript-node \
      -o client \
      --skip-validate-spec \
      --additional-properties supportsES6=true

Steps to reproduce

1. Paste the above yaml into swagger.yaml at the root of this openapi-generator project.
2. Generate the Typescript client with the command above.
3. Compile the client by running:

$ npm install request typescript @types/node
$ npx tsc --target ES6 --lib esnext --module commonjs client/api.ts

Suggest a fix

Import RequestFile into the model template.

--- a/modules/openapi-generator/src/main/resources/typescript-node/model.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-node/model.mustache
@@ -1,6 +1,7 @@
 {{>licenseInfo}}
 {{#models}}
 {{#model}}
+import { RequestFile } from '../api';
 {{#tsImports}}
 import { {{classname}} } from '{{filename}}';
 {{/tsImports}}

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