Run tests in Node.js for ES modules support

Jest currently uses Babel to transform ES modules to CommonJS (and doesn’t support dynamic import) https://jestjs.io/docs/ecmascript-modules This change avoids Node.js VM modules and lets Stylelint v16 use dynamic imports to prevent throwing: ``` TypeError: A dynamic import callback was invoked without --experimental-vm-modules ```
alphagov · Jan 8, 2024 · 67f764b · 67f764b
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diff --git a/jest.config.mjs b/jest.config.mjs
@@ -0,0 +1,5 @@
+export default {
+  // Run tests in Node.js for ES modules support
+  // See: https://jestjs.io/docs/ecmascript-modules
+  runner: 'jest-light-runner'
+}