fix tsc compile error

[gucong3000]

No description provided.

[codecov]

Codecov Report

Merging #69 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   96.43%   96.43%           
=======================================
  Files          12       12           
  Lines         589      589           
  Branches      114      114           
=======================================
  Hits          568      568           
  Misses         12       12           
  Partials        9        9

Impacted Files	Coverage Δ
lib/eclint.ts	88.31% <100%> (ø)	⬆️

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[gucong3000]

@jedmao
Could you please give me the permission to publish on NPM?
https://www.npmjs.com/package/eclint/access
My username is gucong.

[jednano]

Done!