Bundle size optimizations.

[Herz3h]

Replace date-fns by dayjs to reduce bundle size.
Replace lodash's each, assign, filter by native functions.
Add rollup-plugin-visualizer.

Before:

After:

[p0psicles]

You can't just swap out date-fns with dayjs. They both have different templating.
https://day.js.org/docs/en/parse/string-format vs https://date-fns.org/docs/format

Can't expect users to adjust their formats?

[p0psicles]

Can't we use es6 tree-shaking in stead?
https://date-fns.org/v2.0.0-alpha.7/docs/ECMAScript-Modules#tree-shaking

[Herz3h]

I only checked the parse format, which in both cases seem to accept ISO 8601 format by default. Hence the replacement. Will give tree-shaking a try tomorrow.

[Herz3h]

I put back date-fns in and tried date-fns/esm module, but not difference at all in bundle size.

Here is current bundle size:

[p0psicles]

Yeah it's a build issue with poi/webpack egoist/poi#327

Well it should work with webpack 4. And we use the latest version of poi which uses webpack 4. So it as to be an issue with poi, or a config thing

[Herz3h]

I'm not familiar with poi/bili, but npm run bundle runs bili apparently, isn't that based on rollupJS ?

[p0psicles]

@xaksis ?

[xaksis]

hmm, curious. We do use bili for bundling which uses rollup internally. My memory is a bit fuzzy but this might be happening because of an issue with vue-rollup - egoist/bili#221 where we had to use inline bundling for esm file.
original issue on vgt - #569
I didn't get a chance to go back into it but that would be a good start to investigate, to see if we can revert the inline module bundling. basically remove this line: https://github.com/xaksis/vue-good-table/blob/master/bili.config.js#L34
and have the esm file not throw the error mentioned above.

[xaksis]

On another note, I think we can also replace lodash.foreach, lodash.filter, & lodash.assign with their es6 counterparts now and reduce the bundle size further. 🙏

edit: my bad, didn't notice that you already did this for lodash specific functions! Could you please resolve the conflicts so I can push this out next weekend? Thank you @Herz3h!

[Herz3h]

Fixed conflicts

[xaksis]

v2.21.6 contains these changes.