Added CI step to check semver compatibility

- right now our way to check semver compatibility is to run the tests on
  every version
- this is really inefficient as it results in a lot of CI jobs that we
  don't need
- this should run a CI job that ensures the minimum version we accept is
  Node 10.12.0

Author: daniellockyer

.github/workflows/ci.yml

@@ -70,6 +70,9 @@ jobs:
       - name: Install dependencies
         run: yarn install --ignore-scripts
 
+      - name: Check Node compatibility
+        run: node tools/semver-check.js
+
       - name: Add env vars
         shell: bash
         run: |

tools/semver-check.js

@@ -0,0 +1,33 @@
+const fs = require('fs');
+const path = require('path');
+const semver = require('semver');
+
+const supportedVersions = '10.12.0';
+
+function checkEngines(modulePath) {
+    const packageJsonPath = path.join(modulePath, 'package.json');
+
+    if (!fs.existsSync(packageJsonPath)) return;
+
+    const packageJson = JSON.parse(fs.readFileSync(packageJsonPath));
+    const engines = packageJson.engines;
+
+    if (engines && engines.node) {
+        const minVersion = semver.minVersion(engines.node);
+
+        if (semver.gt(minVersion, supportedVersions)) {
+            console.log(`${packageJson.name}@${packageJson.version} requires ${engines.node}`);
+            process.exit(1);
+        }
+    }
+}
+
+const packageJson = JSON.parse(fs.readFileSync(path.join(__dirname, '..', 'package.json')));
+
+const allDependencies = Object.keys(packageJson.dependencies || {}).concat(Object.keys(packageJson.optionalDependencies || {}));
+
+for (const dependency of allDependencies) {
+    const modulePath = path.join(__dirname, '..', 'node_modules', dependency);
+    checkEngines(modulePath);
+}
+