How to choose the best npm module for your team?

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How to choose the best npm module for your team? @sota1235

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Title @sota1235 Sota Sugiura Backend Engineer@Mercari, Inc. “My dream is to be JavaScript”

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Title @sota1235 Sota Sugiura Backend Engineer@Mercari, Inc. “My dream is to be JavaScript”

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Q. How many npm module are you using?

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197

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197 ＝ 197 decisions

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Q. Can you explain a reason behind every npm module you chose?

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Let’s think! https://jp.freeimages.com/photo/thinking-1387695

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http://www.modulecounts.com/

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It’s like a jewelry box! Let’s choose!

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Wait!! Can you explain the Goal you set?

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Using a npm module is not Goal Goal is to solve the problem

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Define the Goal Think about the candidates Decide what to use Solve the problem

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Define the Goal Think about the candidates Decide what to use Solve the problem

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Define the Goal ● There are still many problems to solve ● We always use some tool to solve that problem

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Define the Goal Think about the candidates Decide what to use Solve the problem

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Search a npm module ● www.npmjs.com ● awesome-* pages ● Recommendation from other engineers ● Googling

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Define the Goal Think about the candidates Decide what to use Solve the problem

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Select from candidates ● When you have multiple choices, you need to compare them ● There are a lot of points to do that

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● Star count ● API design ● Size of community ● Performance ● Documentation ● Test coverage ● Quality of code ● and so on...

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https://jp.freeimages.com/photo/cat-1537181

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Again, the Goal is... ● Let’s decide the priority by thinking about the Goal ● If you will use it for prototyping, not necessary to mind test coverage ● If you will use it for only development environment, file size won’t be a problem

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OK, let’s use that!

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Wait!! Did you think about the cost to maintain that?

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Using a npm module is not free :( ● It takes time to maintain ● Managing vulnerability/version ● If maintenance stops, you will need to fork it

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Think about Pros/Cons everytime ● We SHOULD think about Pros/Cons everytime ● What is the benefit to use that? ● What is the problem to use that? ● If Pros won, let’s use that!

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Define the Goal Think about the candidates Decide what to use Solve the problem

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Q. Can you explain a reason behind every npm module you chose?

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Conclusion

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Make it better! ● You should be able to explain the reason ● It’ll be a good experience even if you made a wrong decision

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Thank you @sota1235 JavaScript lover