fix(rest): use direct import to work around a TS bug

See microsoft/TypeScript#26985

Author: raymondfeng

packages/rest/package.json

@@ -42,6 +42,7 @@
     "js-yaml": "^3.11.0",
     "lodash": "^4.17.5",
     "openapi-schema-to-json-schema": "^2.1.0",
+    "openapi3-ts": "^1.0.0",
     "parseurl": "^1.3.2",
     "path-to-regexp": "^2.2.0",
     "qs": "^6.5.2",

packages/rest/src/keys.ts

@@ -5,7 +5,12 @@
 
 import {CoreBindings} from '@loopback/core';
 import {BindingKey, Context} from '@loopback/context';
-import {OpenApiSpec} from '@loopback/openapi-v3-types';
+
+/**
+ * See https://github.com/Microsoft/TypeScript/issues/26985
+ */
+// import {OpenApiSpec} from '@loopback/openapi-v3-types';
+import {OpenAPIObject as OpenApiSpec} from 'openapi3-ts';
 
 import {HttpHandler} from './http-handler';
 import {SequenceHandler} from './sequence';