Add Size Limit

[ai]

Welcome to Bundle Size Optimization society =^_^=. Let’s me introduce you Size Limit — like a linter, but for file size (feel free to close PR, I just want to show here how the tool works).

Any optimization must use benchmarking and profiling before actual optimization. I think the same rule can be applied to bundle size optimization. We need some sort of benchmark to have every-commit feedback and run this benchmark on the Travis CI to prevent accidentally regression.

For example, in some future PR, somebody could use process or global in the wrong way, as result, your library size could be increased twice just because of few extra symbols.

This is why I created Size Limit, a tool to have feedback about library size and prevent JS libraries bloat.

Here is production success stories:

• PostCSS reduced 25% of the size.
• Browserslist reduced 25% of the size.
• EmojiMart reduced 20% of the size
• nanoid reduced 33% of the size.
• Logux reduced 90% of the size.

And few articles, how it works inside.

[sindresorhus]

I think you misunderstood my intention :) The size mention is just an observation, not a constraint. I'm not going to stop useful features from being added just to keep the size down, nor am I going to make the code less readable to keep the size down.

size-limit looks like a useful project if you do want to enforce the max size, but I don't.