diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0cd44c535e9a..03782d03a3f8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -146,7 +146,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16, 14, 12]
+        node-version: [16, 14, 12, 10, 8, 6]
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
diff --git a/jest.config.js b/jest.config.js
index f2f9746acce5..0a14737c1919 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,5 +1,6 @@
 const supportsESM = parseInt(process.versions.node) >= 12;
 
+// These tests files are directly importing `src` files rather than the compiled versions
 const importsSrc = [
   "packages/babel-parser/test/unit/tokenizer/types.js",
   "packages/babel-parser/test/unit/util/identifier.js",
@@ -12,7 +13,7 @@ const importsSrc = [
 ];
 
 module.exports = {
-  runner: "./test/jest-light-runner",
+  ...(supportsESM && { runner: "./test/jest-light-runner" }),
 
   collectCoverageFrom: [
     "packages/*/src/**/*.{js,mjs,ts}",
@@ -36,7 +37,7 @@ module.exports = {
     "<rootDir>/build/",
     "<rootDir>/.history/", // local directory for VSCode Extension - https://marketplace.visualstudio.com/items?itemName=xyz.local-history
     "_browser\\.js",
-    ...importsSrc,
+    ...(supportsESM ? importsSrc : []),
   ],
   testEnvironment: "node",
   setupFilesAfterEnv: ["<rootDir>/test/testSetupFile.js"],