[TS] Fix relative paths for exports

Fixes an issue where exports were using incorrect relative paths for
>=3 namespace levels. This is fixed by making the starting range of the
namespace components relative to the amount of components.

src/idl_gen_ts.cpp

@@ -263,8 +263,8 @@ class TsGenerator : public BaseGenerator {
       for (const auto &def : it.second.definitions) {
         std::vector<std::string> rel_components;
         // build path for root level vs child level
-        if (it.second.ns->components.size() > 1)
-          std::copy(it.second.ns->components.begin() + 1,
+        if (it.second.ns->components.size() > 0)
+          std::copy(it.second.ns->components.begin() + it.second.ns->components.size() - 1,
                     it.second.ns->components.end(),
                     std::back_inserter(rel_components));
         else

tests/long_namespace.fbs

@@ -0,0 +1,7 @@
+namespace com.company.test;
+
+table Person {
+  name:string;
+  age:short;
+}
+root_type Person;

tests/longer_namespace.fbs

@@ -0,0 +1,7 @@
+namespace longer_namespace.a.b.c;
+
+table Person {
+  name:string;
+  age:short;
+}
+root_type Person;

tests/ts/TypeScriptTest.py

@@ -122,6 +122,14 @@ def esbuild(input, output):
     schema="../union_underlying_type_test.fbs"
 )
 
+flatc(options=["--ts"], schema="../long_namespace.fbs")
+esbuild("./long-namespace/com/company.ts", "./long-namespace/long_namespace_generated.cjs")
+
+flatc(options=["--ts"], schema="../longer_namespace.fbs")
+esbuild(
+    "./longer-namespace/a/b/c.ts", "./longer-namespace/longer_namespace_generated.cjs"
+)
+
 print("Running TypeScript Compiler...")
 check_call(["tsc"])
 print("Running TypeScript Compiler in old node resolution mode for no_import_ext...")

tests/ts/tsconfig.json

@@ -15,6 +15,8 @@
     "namespace_test/**/*.ts",
     "union_vector/**/*.ts",
     "arrays_test_complex/**/*.ts",
-    "union_underlying_type_test.ts"
+    "union_underlying_type_test.ts",
+    "long-namespace/**/*.ts",
+    "longer-namespace/**/*.ts"
   ]
 }