[api-extractor] Error: "Symbol not found for identifier" when using import type syntax

[ashmind]

Is this a feature or a bug?

• Feature
• Bug

Please describe the actual behavior.

When using TypeScript new import type syntax, api-extractor produces Error: Symbol not found for identifier.

If the issue is a bug, how can we reproduce it? Please provide detailed steps and include a GitHub branch if applicable. Your issue will get resolved faster if you can make it easy to investigate.

See https://github.com/ashmind/api-extractor-bug-import-type to reproduce.
Code looks like this:

import type { Export } from './export';
export let x: Export;

Run npm test to see the error -- here is the current output:

api-extractor 7.7.8  - https://api-extractor.com/

Using configuration from [redacted]\api-extractor-bug-import-type\api-extractor.json

Error: Symbol not found for identifier: Export
npm ERR! Test failed.  See above for more details.

What is the expected behavior?

Given it's all about type definitions, import type should probably work the same way as normal import.

If this is a bug, please provide the tool version, Node.js version, and OS.

• Tool: api-extractor
• Tool Version: 7.7.8
• Node Version: 10.6.0
  • Is this a LTS version? Yes
  • Have you tested on a LTS version? Yes
• OS: Windows 10