Prints on success

[alexeagle]

A successful build should be quiet, but I get

INFO: Found 15 targets and 2 test targets...
INFO: From Rollup rollup/tests/index.js:

rollup/tests/gen.js → rollup/tests/index.js...
created rollup/tests/index.js in 5ms

[jbedard]

There seems to be no easy way to do this today when using the rollup cli without suppressing everything (including warnings etc) using --silent. We have rollup(silent=True|False) to optionally set that flag already. We'd have to write our own script and invoke the rollup API ourselves, essentially https://github.com/rollup/rollup/blob/v3.20.6/cli/run/build.ts (note the logging at the end).

We could disable colors easily though: https://github.com/rollup/rollup/blob/v3.20.6/src/utils/colors.ts#L7

RFC for better logging: rollup/rollup#2393
More logging vs warning/errors discussions: rollup/rollup#1955

[sam-mfb]

If helpful, I posted the workaround we use on the rollup issue 1955