[core] Upgrade rollup and related plugins

[merceyz]

• I have followed (at least) the PR section of the contributing guide.

Upgraded to the latest version of rollup and its plugins, which produces a smaller bundle

Computed sizes of "build/umd/material-ui.production.min.js" with "umd" format
-  bundler parsing size: 835,914 B
+  bundler parsing size: 819,875 B
-  browser parsing size (minified with terser): 293,979 B
+  browser parsing size (minified with terser): 289,203 B
-  download size (minified and gzipped): 83,766 B
+  download size (minified and gzipped): 82,618 B

[mui-pr-bot]

Details of bundle changes.

Comparing: 831c6cc...eb0c00d

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	315,057	315,057	86,304	86,304
@material-ui/core/Paper	0.00%	0.00%	67,921	67,921	20,184	20,184
@material-ui/core/Paper.esm	0.00%	0.00%	61,217	61,217	18,981	18,981
@material-ui/core/Popper	0.00%	0.00%	28,740	28,740	10,345	10,345
@material-ui/core/Textarea	0.00%	0.00%	5,513	5,513	2,376	2,376
@material-ui/core/TrapFocus	0.00%	0.00%	3,744	3,744	1,573	1,573
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	15,978	15,978	5,787	5,787
@material-ui/core/useMediaQuery	0.00%	0.00%	2,106	2,106	975	975
@material-ui/lab	0.00%	0.00%	138,866	138,866	42,660	42,660
@material-ui/styles	0.00%	0.00%	51,386	51,386	15,193	15,193
@material-ui/system	0.00%	0.00%	14,463	14,463	4,181	4,181
Button	0.00%	0.00%	83,901	83,901	25,459	25,459
Modal	0.00%	0.00%	20,343	20,343	6,685	6,685
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	55,977	55,977	14,042	14,042
docs.main	0.00%	0.00%	648,947	648,947	204,664	204,664
packages/material-ui/build/umd/material-ui.production.min.js	-1.62%	-1.37%	293,979	289,203	83,766	82,618

Generated by 🚫 dangerJS against eb0c00d

[oliviertassinari]

@merceyz Thank you for updating the dependencies! It's important to keep them up to date.

Regarding the bundle size of the UMD bundle, it's not something we want to spend time on to optimize (it's not important). However, I'm happy to see this reduction for free :).

[eps1lon]

Regarding the bundle size of the UMD bundle, it's not something we want to spend time on to optimize (it's not important). However, I'm happy to see this reduction for free :).

It's interesting though since it might be useful to package every module into a single file i.e. Button.js will be a single file and relative imports will be inlined i.e. dependencies on other components become externals.

[oliviertassinari]

Oh yes, sure, if we do move to a flat JavaScript file publish, that we build with rollup and that people consume in production, it matters.

[oliviertassinari]

@merceyz Thank you for taking the time!