improvements to npm pack

[lastlink]

Changes proposed in this pull request:

• npm pack testing

[github-actions]

Coverage after merging f/lastlink2 into master

89.51%

Coverage Report

File	Branches	Funcs	Lines	Uncovered Lines
contants.ts	N/A	100%	100%
index.ts	N/A	100%	89.23%	149, 184, 200, 385, 387, 388, 389, 399, 500, 735, 736, 745, 749, 775, 786, 787, 847, 848, 851, 854, 857, 880, 883, 886, 889, 890, 891, 892