replace jest with ava

node_modules/ci-parallel-vars/LICENSE

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+Copyright (c) 2017-present Jamie Kyle <me@thejameskyle.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

node_modules/ci-parallel-vars/README.md

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+# ci-parallel-vars
+
+> Get CI environment variables for parallelizing builds
+
+## Install
+
+```
+yarn add ci-parallel-vars
+```
+
+## Usage
+
+```js
+const ciParallelVars = require('ci-parallel-vars');
+
+console.log(ciParallelVars); // { index: 3, total: 10 } || null
+```
+
+## Supports
+
+> If you want to add support for another pair, please open a pull request and
+> add them to `index.js` and to this list.
+
+- [Knapsack] / [TravisCI]: `CI_NODE_INDEX`/`CI_NODE_TOTAL`
+- [CircleCI]: `CIRCLE_NODE_INDEX`/`CIRCLE_NODE_TOTAL`
+- [Bitbucket Pipelines]: `BITBUCKET_PARALLEL_STEP`/`BITBUCKET_PARALLEL_STEP_COUNT`',
+- [Buildkite]: `BUILDKITE_PARALLEL_JOB`/`BUILDKITE_PARALLEL_JOB_COUNT`
+
+One of these pairs must both be defined as numbers or `ci-parallel-vars` will
+be `null`.
+
+[Knapsack]: http://docs.knapsackpro.com/ruby/knapsack#info-about-env-variables
+[TravisCI]: https://docs.travis-ci.com/user/speeding-up-the-build/#Parallelizing-RSpec%2C-Cucumber-and-Minitest-on-multiple-VMs
+[CircleCI]: https://circleci.com/docs/1.0/parallel-manual-setup/#using-environment-variables
+[Bitbucket Pipelines]: https://confluence.atlassian.com/bitbucket/parallel-steps-946606807.html
+[Buildkite]: https://buildkite.com/docs/builds/parallel-builds

node_modules/ci-parallel-vars/index.js

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+// @flow
+'use strict';
+
+/*::
+type Match = null | { index: number, total: number };
+*/
+
+const envs = [
+  // Knapsack / TravisCI
+  {
+    index: 'CI_NODE_INDEX',
+    total: 'CI_NODE_TOTAL',
+  },
+  // CircleCI
+  {
+    index: 'CIRCLE_NODE_INDEX',
+    total: 'CIRCLE_NODE_TOTAL',
+  },
+  // Bitbucket Pipelines
+  {
+    index: 'BITBUCKET_PARALLEL_STEP',
+    total: 'BITBUCKET_PARALLEL_STEP_COUNT',
+  },
+  // Buildkite
+  {
+    index: 'BUILDKITE_PARALLEL_JOB',
+    total: 'BUILDKITE_PARALLEL_JOB_COUNT',
+  },
+];
+
+let maybeNum = val => {
+  let num = parseInt(val, 10);
+  return Number.isNaN(num) ? null : num;
+};
+
+let match /*: Match */ = null;
+
+for (let env of envs) {
+  let index = maybeNum(process.env[env.index]);
+  let total = maybeNum(process.env[env.total]);
+
+  if (index !== null && total !== null) {
+    match = { index, total };
+    break;
+  }
+}
+
+module.exports = match;

node_modules/ci-parallel-vars/package.json

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+{
+  "name": "ci-parallel-vars",
+  "version": "1.0.0",
+  "description": "Get CI environment variables for parallelizing builds",
+  "main": "index.js",
+  "repository": "https://github.com/jamiebuilds/ci-parallel-vars",
+  "author": "Jamie Kyle <me@thejameskyle.com>",
+  "license": "MIT",
+  "keywords": [
+    "ci",
+    "env",
+    "vars",
+    "index",
+    "total",
+    "parallel",
+    "builds",
+    "tests",
+    "travis",
+    "circle",
+    "buildkite",
+    "bitbucket",
+    "pipelines",
+    "knapsack"
+  ],
+  "files": [
+    "index.js"
+  ],
+  "scripts": {
+    "test": "ava"
+  },
+  "devDependencies": {
+    "ava": "^0.25.0",
+    "flow-bin": "^0.73.0",
+    "spawndamnit": "^2.0.0"
+  }
+}