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No error for invalid module augmentation in '.d.ts' file #24307

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@ghost

Description

TypeScript Version: 2.9.0-dev.20180519

Code

// @Filename: /a.d.ts
export {};
declare module "invalid" {}

// @Filename: /b.ts
export {};
declare module "invalid" {}

Expected behavior:

Error in both files.

Actual behavior:

Only error in b.ts.

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    By DesignDeprecated - use "Working as Intended" or "Design Limitation" instead

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