replace jest with ava

node_modules/ci-parallel-vars/index.js

@@ -0,0 +1,48 @@
+// @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;