Uses import = require to import helmet types

[fox1t]

Fixes #95 (comment)

Since helmet is using export = the only way to make it work reliably with esModuleInterop: true AND false is to use import = require. This kind of import will tell TS that we are importing a module.exports namespace that could be callable: in fact now TS follows the ESM spec and makes namespaces non-callable by default.

Side note: we need to test our typings, for all our plugins and fastify itself, against all possible combinations of TS configurations to prevent these issues in the future.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

lgtm

[gtolarc]

v5.0.2 certainly does not work in projects with esModuleInterop: true. So it'd better release this on npm as soon as possible:) @mcollina

[fox1t]

@gtolarc I am going to realease the patch.

[fox1t]

v5.0.3 Released