Support schema references #734

"SchemaA": {
    "$ref": "#/components/schemas/SchemaB"
},

{
	"components": {
		"examples": {},
		"headers": {},
		"parameters": {},
		"requestBodies": {},
		"responses": {},
		"schemas": {
			"SchemaB_string_": {
				"properties": {
					"foo": {
						"type": "string"
					}
				},
				"required": [
					"foo"
				],
				"type": "object",
				"additionalProperties": true
			},
			"SchemaA": {
				"$ref": "#/components/schemas/SchemaB_string_"
			}
		},
		"securitySchemes": {}
	},
	"info": {
		"title": "bar-service",
		"version": "1.0.0",
		"description": "bar service",
		"license": {
			"name": "ISC"
		}
	},
	"openapi": "3.0.0",
	"paths": {
		"/foo": {
			"post": {
				"operationId": "Foo",
				"responses": {
					"200": {
						"description": "Ok",
						"content": {
							"application/json": {
								"schema": {
									"$ref": "#/components/schemas/SchemaA"
								}
							}
						}
					}
				},
				"tags": [
					"foobar"
				],
				"security": [],
				"parameters": [],
				"requestBody": {
					"required": true,
					"content": {
						"application/json": {
							"schema": {
								"$ref": "#/components/schemas/SchemaA"
							}
						}
					}
				}
			}
		}
	},
	"servers": [
		{
			"url": "/"
		}
	]
}

Generating bar-service-client
Warning(s) encountered while generating. Client was generated, but some pieces may be missing

WARNING parsing POST /foo within foobar. Endpoint will not be generated.

Could not find reference in parsed models or enums

Reference(ref='#/components/schemas/SchemaA')

Unable to parse this part of your OpenAPI document: 

Reference schemas are not supported.

Reference(ref='#/components/schemas/SchemaB_string_')