Reduce nested functions

[yiningh11]

I simplified the code by reducing the levels of nested functions, which means I moved some functions that were originally defined inside other functions to be separate, standalone functions. This change makes the code structure clearer and easier to follow.
resolves #131

[coveralls]

Pull Request Test Coverage Report for Build 12942847782

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.003%) to 82.674%

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Files with Coverage Reduction	New Missed Lines	%
src/meta/errors.js	1	83.72%

Totals
Change from base Build 12896760049:	0.003%
Covered Lines:	22323
Relevant Lines:	25582

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💛 - Coveralls

[yiningh11]

resolves #131