dtslint silently started failing

[wooorm]

Subject of the issue

dtslint currently fails:

> unified@8.4.0 test-types unified
> dtslint types

Error: unified/types/index.d.ts:3:1
ERROR: 3:1     strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md
ERROR: 4:1     strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md
ERROR: 5:8     strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md
ERROR: 7:19    strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md
ERROR: 412:18  strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md
ERROR: 413:1   strict-export-declare-modifiers  All declarations in this module are exported automatically. Prefer to explicitly write 'export' for clarity. If you have a good reason not to export this declaration, add 'export {}' to the module to shut off automatic exporting. See: https://github.com/Microsoft/dtslint/blob/master/docs/strict-export-declare-modifiers.md

Your environment

• OS: macOS Mojave 10.14.6
• Packages: latest
• Env: Node 12.2, npm 6.11

Steps to reproduce

git clone, npm install, and npm test.

Expected behaviour

Shouldn’t fail

Actual behaviour

Fails

/cc @ChristianMurphy @Rokt33r