diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b0f66d41c..9a9918b18 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -315,11 +315,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+    - name: flatc
+      # FIXME: make test script not rely on flatc
+      run: cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DFLATBUFFERS_BUILD_TESTS=OFF -DFLATBUFFERS_INSTALL=OFF -DFLATBUFFERS_BUILD_FLATLIB=OFF -DFLATBUFFERS_BUILD_FLATHASH=OFF . && make -j
     - name: compile
       run: npm run compile
     - name: test
       working-directory: tests
-      run: sh TypeScriptTest.sh
+      run: python3 TypeScriptTest.py
 
   build-dart:
     name: Build Dart
diff --git a/docs/source/TypeScriptUsage.md b/docs/source/TypeScriptUsage.md
index a1acaeb8a..0dd1da2eb 100644
--- a/docs/source/TypeScriptUsage.md
+++ b/docs/source/TypeScriptUsage.md
@@ -21,8 +21,8 @@ https://www.npmjs.com/package/flatbuffers.
 
 ## Testing the FlatBuffers TypeScript library
 
-To run the tests, use the [TypeScriptTest.sh](https://github.com/google/
-flatbuffers/blob/master/tests/TypeScriptTest.sh) shell script.
+To run the tests, use the [TypeScriptTest.py](https://github.com/google/
+flatbuffers/blob/master/tests/TypeScriptTest.py) Python3 script.
 
 *Note: The TypeScript test file requires [Node.js](https://nodejs.org/en/).*
 
diff --git a/package.json b/package.json
index 41bc51b10..4f43139d9 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "test": "tests"
   },
   "scripts": {
-    "test": "npm run compile && cd tests && ./TypeScriptTest.sh",
+    "test": "npm run compile && cd tests && python3 ./TypeScriptTest.py",
     "compile": "tsc && tsc -p tsconfig.mjs.json",
     "prepublishOnly": "npm install --only=dev && npm run compile"
   },
diff --git a/tests/TestAll.sh b/tests/TestAll.sh
index 06548a213..3a3fcd7bf 100755
--- a/tests/TestAll.sh
+++ b/tests/TestAll.sh
@@ -16,7 +16,7 @@ sh PythonTest.sh
 
 echo "************************ TypeScript:"
 
-sh TypeScriptTest.sh
+python3 TypeScriptTest.py
 
 echo "************************ C++:"
 
diff --git a/tests/TypeScriptTest.bat b/tests/TypeScriptTest.bat
deleted file mode 100755
index daa545106..000000000
--- a/tests/TypeScriptTest.bat
+++ /dev/null
@@ -1,9 +0,0 @@
-npm install
-../flatc.exe --ts --gen-name-strings --gen-mutable --gen-object-api -I include_test monster_test.fbs
-../flatc.exe --gen-object-api -b -I include_test monster_test.fbs unicode_test.json
-../flatc.exe --ts --gen-name-strings --gen-mutable --gen-object-api -o union_vector union_vector/union_vector.fbs
-../flatc.exe --ts --gen-name-strings optional_scalars.fbs
-tsc
-node -r esm JavaScriptTest
-node -r esm JavaScriptUnionVectorTest
-node -r esm JavaScriptFlexBuffersTest
diff --git a/tests/TypeScriptTest.py b/tests/TypeScriptTest.py
new file mode 100644
index 000000000..a3b1e43e1
--- /dev/null
+++ b/tests/TypeScriptTest.py
@@ -0,0 +1,124 @@
+#!/usr/bin/env python3
+#
+# Copyright 2022 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import argparse
+import filecmp
+import glob
+import platform
+import shutil
+import subprocess
+from pathlib import Path
+
+# Get the path where this script is located so we can invoke the script from
+# any directory and have the paths work correctly.
+tests_path = Path(__file__).parent.resolve()
+
+# Get the root path as an absolute path, so all derived paths are absolute.
+root_path = tests_path.parent.absolute()
+
+# Get the location of the flatc executable
+flatc_exe = Path("flatc" if not platform.system() == "Windows" else "flatc.exe")
+
+# Find and assert flatc compiler is present.
+if root_path in flatc_exe.parents:
+    flatc_exe = flatc_exe.relative_to(root_path)
+flatc_path = Path(root_path, flatc_exe)
+assert flatc_path.exists(), "Cannot find the flatc compiler " + str(flatc_path)
+
+# Execute the flatc compiler with the specified parameters
+def flatc(options, schema, prefix=None, include=None, data=None, cwd=tests_path):
+    cmd = [str(flatc_path)] + options
+    if prefix:
+        cmd += ["-o"] + [prefix]
+    if include:
+        cmd += ["-I"] + [include]
+    cmd += [schema] if isinstance(schema, str) else schema
+    if data:
+        cmd += [data] if isinstance(data, str) else data
+    result = subprocess.run(cmd, cwd=str(cwd), check=True)
+
+
+print("Removing node_modules/ directory...")
+shutil.rmtree(Path(tests_path, "node_modules"), ignore_errors=True)
+
+assert subprocess.run(["npm", "install", "--silent"], cwd=str(tests_path), shell=True)
+
+print("Invoking flatc...")
+flatc(
+    options=["--ts", "--gen-name-strings", "--gen-mutable", "--gen-object-api"],
+    schema="monster_test.fbs",
+    include="include_test",
+)
+
+flatc(
+    options=["--gen-object-api", "-b"],
+    schema="monster_test.fbs",
+    include="include_test",
+    data="unicode_test.json",
+)
+
+flatc(
+    options=["--ts", "--gen-name-strings", "--gen-mutable", "--gen-object-api"],
+    schema="union_vector/union_vector.fbs",
+    prefix="union_vector",
+)
+
+flatc(
+    options=["--ts", "--gen-name-strings"],
+    schema="optional_scalars.fbs",
+)
+
+flatc(
+    options=["--ts", "--gen-name-strings", "--gen-mutable", "--gen-object-api"],
+    schema=[
+        "typescript_keywords.fbs",
+        "test_dir/typescript_include.fbs",
+        "test_dir/typescript_transitive_include.fbs",
+        "../reflection/reflection.fbs",
+    ],
+    include="../",
+)
+
+flatc(
+    options=[
+        "--ts",
+        "--gen-name-strings",
+        "--gen-mutable",
+        "--gen-object-api",
+        "--ts-flat-files",
+    ],
+    schema=[
+        "typescript_keywords.fbs",
+        "test_dir/typescript_include.fbs",
+        "test_dir/typescript_transitive_include.fbs",
+        "../reflection/reflection.fbs",
+    ],
+    include="../",
+)
+
+print("Running TypeScript Compiler...")
+assert subprocess.run(["tsc"], cwd=str(tests_path), shell=True)
+
+NODE_CMD = ["node", "-r", "esm"]
+
+print("Running TypeScript Tests...")
+assert subprocess.run(NODE_CMD + ["JavaScriptTest"], cwd=str(tests_path), shell=True)
+assert subprocess.run(
+    NODE_CMD + ["JavaScriptUnionVectorTest"], cwd=str(tests_path), shell=True
+)
+assert subprocess.run(
+    NODE_CMD + ["JavaScriptFlexBuffersTest"], cwd=str(tests_path), shell=True
+)
diff --git a/tests/TypeScriptTest.sh b/tests/TypeScriptTest.sh
deleted file mode 100755
index fd7b82d50..000000000
--- a/tests/TypeScriptTest.sh
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/bin/sh
-#
-# Copyright 2016 Google Inc. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -e
-
-# clean node_modules to make sure we depend on latest local flatbuffers at ../
-rm -rf node_modules
-npm install
-
-if [ -x ../flatc ]; then
-    ../flatc --ts --gen-name-strings --gen-mutable --gen-object-api -I include_test monster_test.fbs
-    ../flatc --gen-object-api -b -I include_test monster_test.fbs unicode_test.json
-    ../flatc --ts --gen-name-strings --gen-mutable --gen-object-api -o union_vector union_vector/union_vector.fbs
-    ../flatc --ts --gen-name-strings optional_scalars.fbs
-    ../flatc --ts --gen-name-strings --gen-object-api --gen-mutable -I ../ ./typescript_keywords.fbs test_dir/typescript_include.fbs test_dir/typescript_transitive_include.fbs ../reflection/reflection.fbs
-    ../flatc --ts --gen-name-strings --gen-object-api --gen-mutable --ts-flat-files -I ../ ./typescript_keywords.fbs test_dir/typescript_include.fbs test_dir/typescript_transitive_include.fbs ../reflection/reflection.fbs
-fi
-tsc
-node -r esm JavaScriptTest
-node -r esm JavaScriptUnionVectorTest
-node -r esm JavaScriptFlexBuffersTest
diff --git a/tests/monster_test.js b/tests/monster_test.js
index b4e13d14b..afc333eeb 100644
--- a/tests/monster_test.js
+++ b/tests/monster_test.js
@@ -9,6 +9,7 @@ export { Race } from './my-game/example/race';
 export { Referrable, ReferrableT } from './my-game/example/referrable';
 export { Stat, StatT } from './my-game/example/stat';
 export { StructOfStructs, StructOfStructsT } from './my-game/example/struct-of-structs';
+export { StructOfStructsOfStructs, StructOfStructsOfStructsT } from './my-game/example/struct-of-structs-of-structs';
 export { Test, TestT } from './my-game/example/test';
 export { TestSimpleTableWithEnum, TestSimpleTableWithEnumT } from './my-game/example/test-simple-table-with-enum';
 export { TypeAliases, TypeAliasesT } from './my-game/example/type-aliases';
diff --git a/tests/my-game/example/struct-of-structs.js b/tests/my-game/example/struct-of-structs.js
index 2debc2943..f265ba508 100644
--- a/tests/my-game/example/struct-of-structs.js
+++ b/tests/my-game/example/struct-of-structs.js
@@ -56,6 +56,7 @@ export class StructOfStructsT {
         this.c = c;
     }
     pack(builder) {
-        return StructOfStructs.createStructOfStructs(builder, (this.a === null ? 0 : this.a.id), (this.a === null ? 0 : this.a.distance), (this.b === null ? 0 : this.b.a), (this.b === null ? 0 : this.b.b), (this.c === null ? 0 : this.c.id), (this.c === null ? 0 : this.c.distance));
+        var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m;
+        return StructOfStructs.createStructOfStructs(builder, ((_b = (_a = this.a) === null || _a === void 0 ? void 0 : _a.id) !== null && _b !== void 0 ? _b : 0), ((_d = (_c = this.a) === null || _c === void 0 ? void 0 : _c.distance) !== null && _d !== void 0 ? _d : 0), ((_f = (_e = this.b) === null || _e === void 0 ? void 0 : _e.a) !== null && _f !== void 0 ? _f : 0), ((_h = (_g = this.b) === null || _g === void 0 ? void 0 : _g.b) !== null && _h !== void 0 ? _h : 0), ((_k = (_j = this.c) === null || _j === void 0 ? void 0 : _j.id) !== null && _k !== void 0 ? _k : 0), ((_m = (_l = this.c) === null || _l === void 0 ? void 0 : _l.distance) !== null && _m !== void 0 ? _m : 0));
     }
 }
diff --git a/tests/my-game/example/vec3.js b/tests/my-game/example/vec3.js
index 5fd244737..102ce4ada 100644
--- a/tests/my-game/example/vec3.js
+++ b/tests/my-game/example/vec3.js
@@ -92,6 +92,7 @@ export class Vec3T {
         this.test3 = test3;
     }
     pack(builder) {
-        return Vec3.createVec3(builder, this.x, this.y, this.z, this.test1, this.test2, (this.test3 === null ? 0 : this.test3.a), (this.test3 === null ? 0 : this.test3.b));
+        var _a, _b, _c, _d;
+        return Vec3.createVec3(builder, this.x, this.y, this.z, this.test1, this.test2, ((_b = (_a = this.test3) === null || _a === void 0 ? void 0 : _a.a) !== null && _b !== void 0 ? _b : 0), ((_d = (_c = this.test3) === null || _c === void 0 ? void 0 : _c.b) !== null && _d !== void 0 ? _d : 0));
     }
 }