fix: fix declarations

[whxaxes]

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

Fix mistake of declarations, and add unittest for types.

[codecov[bot]]

Codecov Report

Merging #20 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   96.77%   96.77%           
=======================================
  Files           1        1           
  Lines         124      124           
  Branches       36       36           
=======================================
  Hits          120      120           
  Misses          4        4

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 9aa2ca1...1877a45. Read the comment docs.

[codecov[bot]]

Codecov Report

Merging #20 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   96.77%   96.77%           
=======================================
  Files           1        1           
  Lines         124      124           
  Branches       36       36           
=======================================
  Hits          120      120           
  Misses          4        4

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 9aa2ca1...5a4c0d0. Read the comment docs.

[fengmk2]

@whxaxes ci fails

[whxaxes]

Seems mocha doesn't support node-4 anymore, I delete node-4 from travis.yml

[whxaxes]

ci passed

[fengmk2]

1.1.2