diff --git a/javascript/ql/test/library-tests/TypeScript/Types/tsconfig.json b/javascript/ql/test/library-tests/TypeScript/Types/tsconfig.json
index f6aa3a1e752..2235cec7f7d 100644
--- a/javascript/ql/test/library-tests/TypeScript/Types/tsconfig.json
+++ b/javascript/ql/test/library-tests/TypeScript/Types/tsconfig.json
@@ -3,6 +3,7 @@
     "module": "esnext",
     "target": "esnext",
     "lib": ["dom", "esnext"],
-    "resolveJsonModule": true
+    "resolveJsonModule": true,
+    "moduleSuffixes": [".ios", ""]
   }
 }
diff --git a/javascript/ql/test/library-tests/TypeScript/Types/tst.ts b/javascript/ql/test/library-tests/TypeScript/Types/tst.ts
index aa6024ad088..ed8787112d3 100644
--- a/javascript/ql/test/library-tests/TypeScript/Types/tst.ts
+++ b/javascript/ql/test/library-tests/TypeScript/Types/tst.ts
@@ -363,3 +363,13 @@ console.log(tstModuleCJS());
 
 /////////////////
 
+// test file resolution order (see tsconfig: moduleSuffixes setting)
+
+import * as A from './tstSuffixA';
+
+console.log(A.resolvedFile()); // <- 'tstSuffixA.ts'
+
+import * as B from './tstSuffixB';
+
+console.log(B.resolvedFile()); // <- 'tstSuffixB.ios.ts'
+
diff --git a/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixA.ts b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixA.ts
new file mode 100644
index 00000000000..ffe0b811492
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixA.ts
@@ -0,0 +1,3 @@
+export function resolvedFile(): 'tstSuffixA.ts' {
+    return 'tstSuffixA.ts';
+} 
diff --git a/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ios.ts b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ios.ts
new file mode 100644
index 00000000000..04463fc7699
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ios.ts
@@ -0,0 +1,3 @@
+export function resolvedFile(): 'tstSuffixB.ios.ts' {
+    return 'tstSuffixB.ios.ts';
+}
diff --git a/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ts b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ts
new file mode 100644
index 00000000000..cdb26f8f614
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/Types/tstSuffixB.ts
@@ -0,0 +1,3 @@
+export function resolvedFile(): 'tstSuffixB.ts' {
+    return 'tstSuffixB.ts';
+}