[TS/JS] Entry point per namespace and reworked 1.x compatible single file build (#7510)

* [TS/JS] Entry point per namespace

* Fix handling of outputpath and array_test

* Attempt to fix generate_code

* Fix cwd for ts in generate_code

* Attempt to fixup bazel and some docs

* Add --ts-flat-files to bazel build to get bundle

* Move to DEFAULT_FLATC_TS_ARGS

* Attempt to add esbuild

* Attempt to use npm instead

* Remove futile attempt to add esbuild

* Attempt to as bazel esbuild

* Shuffle

* Upgrade bazel deps

* Revert failed attempts to get bazel working

* Ignore flatc tests for now

* Add esbuild dependency

* `package.json` Include esbuild

* `WORKSPACE` Add fetching esbuild binary

* Update WORKSPACE

* Unfreeze Lockfile

* Update WORKSPACE

* Update BUILD.bazel

* Rework to suggest instead of running external bundler

* Add esbuild generation to test script

* Prelim bundle test

* Run test JavaScriptTest from flatbuffers 1.x

* Deps upgrade

* Clang format fix

* Revert bazel changes

* Fix newline

* Generate with type declarations

* Handle "empty" root namespace

* Adjust tests for typescript_keywords.ts

* Separate test procedure for old node resolution module output

* Fix rel path for root level re-exports

* Bazel support for esbuild-based flatc

Unfortunately, we lose typing information because the new esbuild method
of generating single files does not generate type information.

The method used here is a bit hack-ish because it relies on parsing the
console output of flatc to figure out what to do.

* Try to fix bazel build for when node isn't present on host

* Auto formatting fixes

* Fix missing generated code

Co-authored-by: Derek Bailey <derekbailey@google.com>
Co-authored-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>

tests/ts/TypeScriptTest.py

@@ -44,6 +44,7 @@ def check_call(args, cwd=tests_path):
 
 # Execute the flatc compiler with the specified parameters
 def flatc(options, schema, prefix=None, include=None, data=None, cwd=tests_path):
+    print("Invoking flatc on schema " + str(schema))
     cmd = [str(flatc_path)] + options
     if prefix:
         cmd += ["-o"] + [prefix]
@@ -54,17 +55,23 @@ def flatc(options, schema, prefix=None, include=None, data=None, cwd=tests_path)
         cmd += [data] if isinstance(data, str) else data
     check_call(cmd)
 
+# Execute esbuild with the specified parameters
+def esbuild(input, output):
+    cmd = ["esbuild", input, "--outfile=" + output]
+    cmd += ["--format=cjs", "--bundle", "--external:flatbuffers"]
+    check_call(cmd)
+
 print("Removing node_modules/ directory...")
 shutil.rmtree(Path(tests_path, "node_modules"), ignore_errors=True)
 
 check_call(["npm", "install", "--silent"])
 
-print("Invoking flatc...")
 flatc(
-    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-mutable", "--gen-object-api"],
+    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-mutable", "--gen-object-api", "--ts-entry-points", "--ts-flat-files"],
     schema="../monster_test.fbs",
     include="../include_test",
 )
+esbuild("monster_test.ts", "monster_test_generated.cjs")
 
 flatc(
     options=["--gen-object-api", "-b"],
@@ -74,10 +81,11 @@ flatc(
 )
 
 flatc(
-    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-mutable", "--gen-object-api"],
+    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-mutable", "--gen-object-api", "--ts-entry-points", "--ts-flat-files"],
     schema="../union_vector/union_vector.fbs",
     prefix="union_vector",
 )
+esbuild("union_vector/union_vector.ts", "union_vector/union_vector_generated.cjs")
 
 flatc(
     options=["--ts", "--reflect-names", "--gen-name-strings"],
@@ -91,31 +99,14 @@ flatc(
 )
 
 flatc(
-    options=["--ts", "--reflect-names", "--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", "--reflect-names", "--ts-flat-files", "--gen-name-strings", "--gen-object-api"],
+    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-object-api", "--ts-entry-points", "--ts-flat-files"],
     schema="arrays_test_complex/arrays_test_complex.fbs",
     prefix="arrays_test_complex"
 )
+esbuild("arrays_test_complex/my-game/example.ts", "arrays_test_complex/arrays_test_complex_generated.cjs")
 
 flatc(
-    options=[
-        "--ts",
-        "--reflect-names",
-        "--gen-name-strings",
-        "--gen-mutable",
-        "--gen-object-api",
-        "--ts-flat-files",
-    ],
+    options=["--ts", "--reflect-names", "--gen-name-strings", "--gen-mutable", "--gen-object-api", "--ts-entry-points", "--ts-flat-files"],
     schema=[
         "typescript_keywords.fbs",
         "test_dir/typescript_include.fbs",
@@ -124,15 +115,18 @@ flatc(
     ],
     include="../../",
 )
+esbuild("typescript_keywords.ts", "typescript_keywords_generated.cjs")
 
 print("Running TypeScript Compiler...")
 check_call(["tsc"])
+print("Running TypeScript Compiler in old node resolution mode for no_import_ext...")
+check_call(["tsc", "-p", "./tsconfig.node.json"])
 
 NODE_CMD = ["node"]
 
 print("Running TypeScript Tests...")
 check_call(NODE_CMD + ["JavaScriptTest"])
+check_call(NODE_CMD + ["JavaScriptTestv1.cjs", "./monster_test_generated.cjs"])
 check_call(NODE_CMD + ["JavaScriptUnionVectorTest"])
 check_call(NODE_CMD + ["JavaScriptFlexBuffersTest"])
 check_call(NODE_CMD + ["JavaScriptComplexArraysTest"])
-check_call(NODE_CMD + ["JavaScriptRequiredStringTest"])