@@ -53,7 +53,7 @@ describe("esm-utils", function () {
       return expect(
         () =>
           esmUtils.requireOrImport(
-            "../../test/node-unit/fixtures/mock-mocha-forbidden-exclusivity-err.ts",
+            "../../test/node-unit/fixtures/commonjs/mock-mocha-forbidden-exclusivity-err.ts",
           ),
         "to be rejected with error satisfying",
         {
 
@@ -0,0 +1,13 @@
+/*
+ Mock file that simulates a Mocha FORBIDDEN_EXCLUSIVITY error
+ This error is thrown when .only is used in parallel mode
+
+ This fixture uses require(), so it lives in a folder with a "commonjs" package.json.
+ The root package.json is "type": "module" which would otherwise make Node load this 
+ .ts file as ESM and leave "require" undefined.
+ */
+const { createForbiddenExclusivityError } = require('../../../../lib/errors.js');
+
+const mockMocha = { isWorker: true };
+
+throw createForbiddenExclusivityError(mockMocha);
@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}
Original file line number	Diff line number	Diff line change
`@@ -53,7 +53,7 @@ describe("esm-utils", function () {`
`53`	`53`	`return expect(`
`54`	`54`	`() =>`
`55`	`55`	`esmUtils.requireOrImport(`
`56`		`- "../../test/node-unit/fixtures/mock-mocha-forbidden-exclusivity-err.ts",`
	`56`	`+ "../../test/node-unit/fixtures/commonjs/mock-mocha-forbidden-exclusivity-err.ts",`
`57`	`57`	`),`
`58`	`58`	`"to be rejected with error satisfying",`
`59`	`59`	`{`