[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>

scripts/generate_code.py

@@ -24,6 +24,7 @@ from util import flatc, root_path, tests_path, args, flatc_path
 
 # Specify the other paths that will be referenced
 swift_code_gen = Path(root_path, "tests/swift/tests/CodeGenerationTests")
+ts_code_gen = Path(root_path, "tests/ts")
 samples_path = Path(root_path, "samples")
 reflection_path = Path(root_path, "reflection")
 
@@ -142,10 +143,10 @@ flatc(
 flatc(
     NO_INCL_OPTS
     + TS_OPTS,
-    schema="monster_test.fbs",
-    prefix="ts",
-    include="include_test",
-    data="monsterdata_test.json",
+    cwd=ts_code_gen,
+    schema="../monster_test.fbs",
+    include="../include_test",
+    data="../monsterdata_test.json",
 )
 
 flatc(
@@ -210,37 +211,31 @@ flatc(
 
 flatc(
     BASE_OPTS + TS_OPTS,
-    prefix="ts/union_vector",
-    schema="union_vector/union_vector.fbs",
+    cwd=ts_code_gen,
+    prefix="union_vector",
+    schema="../union_vector/union_vector.fbs",
 )
 
 flatc(
     BASE_OPTS + TS_OPTS + ["--gen-name-strings", "--gen-mutable"],
-    include="include_test",
-    prefix="ts",
-    schema="monster_test.fbs",
-)
-
-# Generate the complete flat file TS of monster.
-flatc(
-    ["--ts", "--gen-all", "--ts-flat-files"],
-    include="include_test",
-    schema="monster_test.fbs",
-    prefix="ts/ts-flat-files"
+    cwd=ts_code_gen,
+    include="../include_test",
+    schema="../monster_test.fbs",
 )
 
 flatc(
     BASE_OPTS + TS_OPTS + ["-b"],
-    include="include_test",
-    prefix="ts",
-    schema="monster_test.fbs",
-    data="unicode_test.json",
+    cwd=ts_code_gen,
+    include="../include_test",
+    schema="../monster_test.fbs",
+    data="../unicode_test.json",
 )
 
 flatc(
     BASE_OPTS + TS_OPTS + ["--gen-name-strings"],
-    prefix="ts/union_vector",
-    schema="union_vector/union_vector.fbs",
+    cwd=ts_code_gen,
+    prefix="union_vector",
+    schema="../union_vector/union_vector.fbs",
 )
 
 flatc(
@@ -340,7 +335,7 @@ flatc(
 # Optional Scalars
 optional_scalars_schema = "optional_scalars.fbs"
 flatc(["--java", "--kotlin", "--lobster"], schema=optional_scalars_schema)
-flatc(TS_OPTS, schema=optional_scalars_schema, prefix="ts")
+flatc(TS_OPTS, cwd=ts_code_gen, schema="../optional_scalars.fbs")
 
 flatc(["--csharp", "--python", "--gen-object-api"], schema=optional_scalars_schema)