refactor: split node.js function to node-helper

[nogic1008]

No description provided.

[commit-lint]

Code Refactoring

• split process.env action to node-helper (aef39f1)
• use Set (46fd2c8)
• simplify isSupportedEvent() (263b0fe)

Build System

• lint: add no-process-env & no-console rule (33d5cec)

Doc

• add documentation comment (cb5c50a)

Tests

• reduce test cases (0a95d07)

Contributors

@nogic1008

[codecov]

Codecov Report

Merging #63 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           59        60    +1     
  Branches        12         9    -3     
=========================================
+ Hits            59        60    +1     

Impacted Files	Coverage Δ
src/event.ts	100.00% <100.00%> (ø)
src/input-helper.ts	100.00% <100.00%> (ø)
src/main.ts	100.00% <100.00%> (ø)
src/node-helper.ts	100.00% <100.00%> (ø)
src/send-comment.ts	100.00% <100.00%> (ø)

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