Improve typings

[ardatan]

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Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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  expected)
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• Test B

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Checklist:

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  CONTRIBUTING doc and the
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✅ Benchmark Results

     ✓ no_errors{server:node-http,mode:no-schema}
     ✓ expected_result{server:node-http,mode:no-schema}
     ✓ no_errors{server:node-http,mode:json-schema}
     ✓ expected_result{server:node-http,mode:json-schema}
     ✓ no_errors{server:uWebSockets,mode:no-schema}
     ✓ expected_result{server:uWebSockets,mode:no-schema}
     ✓ no_errors{server:uWebSockets,mode:json-schema}
     ✓ expected_result{server:uWebSockets,mode:json-schema}

     checks......................................: 100.00% ✓ 961392      ✗ 0     
     data_received...............................: 87 MB   726 kB/s
     data_sent...................................: 61 MB   509 kB/s
     http_req_blocked............................: avg=1.28µs   min=800ns   med=1.1µs   max=875.42µs p(90)=1.6µs   p(95)=1.9µs  
     http_req_connecting.........................: avg=3ns      min=0s      med=0s      max=809.22µs p(90)=0s      p(95)=0s     
     http_req_duration...........................: avg=167.53µs min=97.8µs  med=150.5µs max=26.42ms  p(90)=195.6µs p(95)=219.5µs
       { expected_response:true }................: avg=167.53µs min=97.8µs  med=150.5µs max=26.42ms  p(90)=195.6µs p(95)=219.5µs
     ✓ { server:node-http,mode:json-schema }.....: avg=181.98µs min=122.7µs med=167.6µs max=15.18ms  p(90)=211.3µs p(95)=231.8µs
     ✓ { server:node-http,mode:no-schema }.......: avg=178.93µs min=109.7µs med=157.4µs max=26.42ms  p(90)=214.2µs p(95)=235.3µs
     ✓ { server:uWebSockets,mode:json-schema }...: avg=157.83µs min=104.3µs med=143.7µs max=10.93ms  p(90)=175.7µs p(95)=191.8µs
     ✓ { server:uWebSockets,mode:no-schema }.....: avg=154.24µs min=97.8µs  med=137.4µs max=11.19ms  p(90)=171.9µs p(95)=192.4µs
     http_req_failed.............................: 0.00%   ✓ 0           ✗ 480696
     http_req_receiving..........................: avg=19.11µs  min=10.5µs  med=16.1µs  max=5.53ms   p(90)=27.1µs  p(95)=31.7µs 
     http_req_sending............................: avg=7.59µs   min=4.8µs   med=6µs     max=12.08ms  p(90)=10.8µs  p(95)=12.4µs 
     http_req_tls_handshaking....................: avg=0s       min=0s      med=0s      max=0s       p(90)=0s      p(95)=0s     
     http_req_waiting............................: avg=140.83µs min=77.6µs  med=125.8µs max=23.7ms   p(90)=163.7µs p(95)=184.4µs
     http_reqs...................................: 480696  4005.660115/s
     iteration_duration..........................: avg=243.82µs min=157.6µs med=222.4µs max=26.61ms  p(90)=285.5µs p(95)=313.8µs
     iterations..................................: 480696  4005.660115/s
     vus.........................................: 1       min=1         max=1   
     vus_max.....................................: 2       min=2         max=2