diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 8eb5f73b1a9..a1e33f00d8f 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -3684,6 +3684,10 @@
         "category": "Message",
         "code": 6208
     },
+    "'package.json' has a 'typesVersions' entry '{0}' that is not a valid semver range.": {
+        "category": "Message",
+        "code": 6209
+    },
 
     "Projects to reference": {
         "category": "Message",
diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index 0c2d35f19a8..bae4dbfa430 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -165,6 +165,14 @@ namespace ts {
         const typesVersions = readPackageJsonTypesVersionsField(jsonContent, state);
         if (typesVersions === undefined) return;
 
+        if (state.traceEnabled) {
+            for (const key in typesVersions) {
+                if (hasProperty(typesVersions, key) && !VersionRange.tryParse(key)) {
+                    trace(state.host, Diagnostics.package_json_has_a_typesVersions_entry_0_that_is_not_a_valid_semver_range, key);
+                }
+            }
+        }
+
         const result = getPackageJsonTypesVersionsPaths(typesVersions);
         if (!result) {
             if (state.traceEnabled) {