fix: override module and moduleResolution for mocha test scripts

bennypowers · bennypowers · commit 66d1d9ed6b89 · 2026-03-18T19:02:51.000+02:00
ts-node with module:nodenext treats .ts files as ESM, causing
"Cannot require() ES Module" errors. Override both module and
moduleResolution to commonjs/node for test execution.

Assisted-By: Claude Opus 4.6 (1M context) &lt;noreply@anthropic.com&gt;
diff --git a/packages/browser-logs/package.json b/packages/browser-logs/package.json
@@ -26,8 +26,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/dev-server-core/package.json b/packages/dev-server-core/package.json
@@ -38,8 +38,8 @@
     "start:event-stream": "node demo/event-stream/start-server.js",
     "start:http2": "node demo/http2/start-server.js",
     "start:import-asset": "node demo/import-asset/start-server.js",
-    "test": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --exit --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
+    "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --exit --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     ".self-signed-dev-server-ssl.cert",
diff --git a/packages/dev-server-esbuild/package.json b/packages/dev-server-esbuild/package.json
@@ -28,8 +28,8 @@
     "build": "tsc",
     "start:demo:jsx": "es-dev-server --config demo/jsx/server.config.js",
     "start:demo:ts": "es-dev-server --config demo/ts/server.config.js",
-    "test:node": "mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/dev-server-hmr/package.json b/packages/dev-server-hmr/package.json
@@ -28,8 +28,8 @@
     "build": "tsc",
     "start:lit-html": "wds --config demo/lit-html/server.config.mjs",
     "start:vanilla": "wds --config demo/vanilla/server.config.mjs",
-    "test:node": "mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/dev-server-import-maps/package.json b/packages/dev-server-import-maps/package.json
@@ -26,9 +26,9 @@
   },
   "scripts": {
     "build": "tsc",
-    "test": "mocha \"test/**/*.test.ts\" --require ts-node/register",
+    "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register",
     "test:browser": "node ../test-runner/dist/bin.js test-browser/test/**/*.test.{js,html} --config test-browser/web-test-runner.config.mjs",
-    "test:watch": "mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/dev-server-legacy/package.json b/packages/dev-server-legacy/package.json
@@ -27,8 +27,8 @@
   "scripts": {
     "build": "tsc",
     "start": "wds --open --config demo/server.config.mjs",
-    "test:node": "mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/dev-server-rollup/package.json b/packages/dev-server-rollup/package.json
@@ -25,8 +25,8 @@
     "node": ">=24.0.0"
   },
   "scripts": {
-    "test:node": "mocha \"test/node/**/*.test.ts\" --require ts-node/register --exit --reporter dot",
-    "test:watch": "mocha \"test/node/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/node/**/*.test.ts\" --require ts-node/register --exit --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/node/**/*.test.ts\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/parse5-utils/package.json b/packages/parse5-utils/package.json
@@ -26,8 +26,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
-    "test:watch": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch"
   },
   "files": [
     "dist",
diff --git a/packages/polyfills-loader/package.json b/packages/polyfills-loader/package.json
@@ -26,9 +26,9 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
-    "test:update-snapshots": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --update-snapshots",
-    "test:watch": "mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --reporter dot",
+    "test:update-snapshots": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --update-snapshots",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha \"test/**/*.test.{ts,js,mjs,cjs}\" --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/rollup-plugin-html/package.json b/packages/rollup-plugin-html/package.json
@@ -28,8 +28,8 @@
     "demo:mpa": "rm -rf demo/dist && rollup -c demo/mpa/rollup.config.js --watch & npm run serve-demo",
     "demo:spa": "rm -rf demo/dist && rollup -c demo/spa/rollup.config.js --watch & npm run serve-demo",
     "serve-demo": "node ../dev-server/dist/bin.js --watch --root-dir demo/dist --app-index index.html --compatibility none --open",
-    "test:node": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.js",
diff --git a/packages/rollup-plugin-polyfills-loader/package.json b/packages/rollup-plugin-polyfills-loader/package.json
@@ -25,9 +25,9 @@
     "node": ">=24.0.0"
   },
   "scripts": {
-    "test:node": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:update-snapshots": "mocha test/**/*.test.ts --require ts-node/register --update-snapshots",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:update-snapshots": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --update-snapshots",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/test-runner-commands/package.json b/packages/test-runner-commands/package.json
@@ -30,8 +30,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test --watch-ignore **/*.snap.js"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test --watch-ignore **/*.snap.js"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/test-runner-core/package.json b/packages/test-runner-core/package.json
@@ -32,8 +32,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/test-runner-junit-reporter/package.json b/packages/test-runner-junit-reporter/package.json
@@ -26,8 +26,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test --reporter dot"
+    "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test --reporter dot"
   },
   "files": [
     "*.d.ts",
diff --git a/packages/test-runner-visual-regression/package.json b/packages/test-runner-visual-regression/package.json
@@ -30,8 +30,8 @@
   },
   "scripts": {
     "build": "tsc",
-    "test:node": "mocha test/**/*.test.ts --require ts-node/register --reporter dot",
-    "test:watch": "mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --reporter dot",
+    "test:watch": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\",\"moduleResolution\":\"node\"}' mocha test/**/*.test.ts --require ts-node/register --watch --watch-files src,test"
   },
   "files": [
     "*.d.ts",
