Setup following directions from [webpack-node-externals]
[webpack-node-externals]: https://www.npmjs.com/package/webpack-node-externals
This unblocks #210.
Test plan: `yarn backend` still succeeds, and the binary scripts still
work. The resultant binaries are much smaller, as seen below (note build
time is the same).
before:
```
❯ yarn backend
yarn run v1.5.1
$ node scripts/backend.js
Building backend applications...
Compiled successfully.
File sizes after gzip:
231.37 KB bin/printCombinedGraph.js
199.5 KB bin/fetchAndPrintGithubRepo.js
46.41 KB bin/cloneAndPrintGitGraph.js
21.48 KB bin/createExampleRepo.js
17.71 KB bin/loadAndPrintGitRepository.js
Build completed; results in 'bin'.
Done in 4.46s.
```
after:
```
❯ yarn backend
yarn run v1.5.1
$ node scripts/backend.js
Building backend applications...
Compiled successfully.
File sizes after gzip:
27.78 KB bin/printCombinedGraph.js
12.73 KB bin/cloneAndPrintGitGraph.js
12.41 KB bin/fetchAndPrintGithubRepo.js
6.03 KB bin/loadAndPrintGitRepository.js
5.52 KB bin/createExampleRepo.js
Build completed; results in 'bin'.
Done in 4.28s.
```
Test Plan:
Run `yarn lint` and `yarn travis` and observe success. Add something
that triggers a lint warning, like `const zzz = 3;`; re-run and observe
failures.
wchargin-branch: lint
Summary:
Running `yarn backend` will now bundle backend applications. They’ll be
placed into the new `bin/` directory. This enables us to use ES6 modules
with the standard syntax, Flow types, and all the other goodies that
we’ve come to expect. A backend build takes about 2.5s on my laptop.
Created by forking the prod configuration to a backend configuration and
trimming it down appropriately.
To test out the new changes, this commit changes `fetchGitHubRepo` and
its driver to use the ES6 module system and Flow types, both of which
are properly resolved.
Test Plan:
Run `yarn backend`. Then, you can directly run an entry point via
```
$ node bin/fetchAndPrintGitHubRepo.js sourcecred example-repo "${TOKEN}"
```
or invoke the standard test driver via
```shell
$ GITHUB_TOKEN="${TOKEN}" src/backend/fetchGitHubRepoTest.sh
```
where `${TOKEN}` is your GitHub authentication token.
wchargin-branch: webpack-backend
Dandelion Mané
William Chargin