Add lerna and split project

[nlepage]

Description

• Add lerna and move sources in a package
• Move scripts in top level package.json
• Split the project
• Fix all... (documentation, tests, lint, coverage, ci)

Issue : #78

[nlepage]

Codecov seems pretty lost...
Last execution reported an error : https://codecov.io/github/Zenika/immutadot/commit/fb0dfc641e0302057f34707bc358bc44f236b765
Either the report is empty, or it fails to find source files...

[nlepage]

yarn test crashes in immutadot-lodash
Module resolver can't find imports relative to immutadot/src...

[codecov-io]

Codecov Report

Merging #138 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #138   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          75     75           
  Lines         322    278   -44     
  Branches       54      0   -54     
=====================================
- Hits          322    278   -44

Impacted Files	Coverage Δ
packages/immutadot/src/flow/flow.js	100% <ø> (ø)
packages/immutadot/src/core/path.utils.js	100% <ø> (ø)
packages/immutadot-lodash/src/array/remove.js	100% <ø> (ø)
packages/immutadot/src/math/multiply.js	100% <ø> (ø)
packages/immutadot-lodash/src/object/omit.js	100% <ø> (ø)
packages/immutadot/src/array/concat.js	100% <ø> (ø)
packages/immutadot-lodash/src/object/pickBy.js	100% <ø> (ø)
packages/immutadot/src/lang/toggle.js	100% <ø> (ø)
...kages/immutadot-lodash/src/array/takeRightWhile.js	100% <ø> (ø)
packages/immutadot-lodash/src/collection/map.js	100% <ø> (ø)
... and 66 more

---

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[nlepage]

OK for some reason I had removed module-resolver from babel's build (when making flow), and this was a huge mistake.
I put it back, and it fixed immutadot-lodash's tests.

It made me realise that immutadot-lodash's tests rely on the built immutadot core.
So it's necessary to execute yarn build on immutadot core before executing immutadot-lodash's tests for these to work...

For now I see no clean way of handling this.
This is a dependency between scripts of different packages, I don't think lerna can help us resolve this...
Moreover it would be pretty ugly to add a call to yarn build in a pretest script...

[nlepage]

Codecov is back on his feet, but it reports -45 files so it is missing one of the reports...

[nlepage]

Maybe tests should be rewritten to real unit tests, so that these don't rely on immutadot's core...

[nlepage]

Finally codecov is OK. But codecov ignores wouldn't work, I had to use jest ignores. And codecov flags still aren't working...

[frinyvonnick]

When i execute yarnto install dependencies i have the following warning:

warning "workspace-aggregator-d2639e58-f6c2-4c62-a6fd-4cb79bd5a18f > immutadot@0.3.2" has unmet peer dependency "lodash@^4.17.4".

Then when i execute yarn test i have a bunch of errors like:

FAIL packages/immutadot-lodash/src/string/capitalize.spec.js
  ● Test suite failed to run

    Cannot find module 'immutadot/core/convert' from 'capitalize.js'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:191:17)
      at Object.<anonymous>.Object.defineProperty.value (packages/immutadot-lodash/src/string/capitalize.js:1:335)
      at Object.<anonymous> (packages/immutadot-lodash/src/string/capitalize.js:1:495)

[nlepage]

You have to execute a yarn build for yarn test to work.
This is due to immutadot-lodash's tests needing the built immutadot core.

[frinyvonnick]

Maybe we could add a pretest script for this to be transparent for developper ?

[nlepage]

As I mentionned in #138 (comment) I find it a little overkill, and I'm not sure if it's possible to have inter-package script dependency...

[nlepage]

@frinyvonnick I added immutadot's build to immutadot-lodash's pretest, this is ready for review.

[frinyvonnick]

Nice work 👍