[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>

typescript.bzl

@@ -3,8 +3,7 @@ Rules for building typescript flatbuffers with Bazel.
 """
 
 load("@build_bazel_rules_nodejs//:index.bzl", "js_library")
-load("@npm//@bazel/typescript:index.bzl", "ts_project")
-load(":build_defs.bzl", "DEFAULT_INCLUDE_PATHS", "flatbuffer_library_public")
+load(":build_defs.bzl", "flatbuffer_library_public")
 
 DEFAULT_FLATC_TS_ARGS = [
     "--gen-object-api",
@@ -21,11 +20,10 @@ def flatbuffer_ts_library(
         compatible_with = None,
         target_compatible_with = None,
         deps = [],
-        include_paths = DEFAULT_INCLUDE_PATHS,
+        include_paths = None,
         flatc_args = DEFAULT_FLATC_TS_ARGS,
         visibility = None,
         restricted_to = None,
-        include_reflection = True,
         gen_reflections = False,
         package_name = None):
     """Generates a ts_library rule for a given flatbuffer definition.
@@ -46,9 +44,6 @@ def flatbuffer_ts_library(
         for, instead of default-supported environments.
       target_compatible_with: Optional, The list of target platform constraints
         to use.
-      include_reflection: Optional, Whether to depend on the flatbuffer
-        reflection library automatically. Only really relevant for the
-        target that builds the reflection library itself.
       gen_reflections: Optional, if true this will generate the flatbuffer
         reflection binaries for the schemas.
       package_name: Optional, Package name to use for the generated code.
@@ -56,65 +51,26 @@ def flatbuffer_ts_library(
     srcs_lib = "%s_srcs" % (name)
     out_base = [s.replace(".fbs", "").split("/")[-1].split(":")[-1] for s in srcs]
 
-    # Because of how we have to manage the bazel rules for typescript,
-    # reflection has to get special-cased to get imported when
-    # run within bazel. As such, generate the code using the _pregenerate
-    # suffix; then do a find/replace to fix-up all the reflection imports.
-    pre_outs = ["%s_pregenerated.ts" % s for s in out_base]
-    outs = ["%s_generated.ts" % s for s in out_base]
+    if len(srcs) != 1:
+        fail("flatbuffer_ts_library only supports one .fbs file per target currently.")
+
+    outs = ["%s_generated.cjs" % s for s in out_base]
     includes = [d + "_includes" for d in deps]
     reflection_name = "%s_reflection" % name if gen_reflections else ""
     flatbuffer_library_public(
         name = srcs_lib,
         srcs = srcs,
-        outs = pre_outs,
+        outs = outs,
         language_flag = "--ts",
         includes = includes,
         include_paths = include_paths,
-        flatc_args = flatc_args + ["--filename-suffix _pregenerated"],
+        flatc_args = flatc_args + ["--filename-suffix _generated"],
         compatible_with = compatible_with,
         restricted_to = restricted_to,
         reflection_name = reflection_name,
         reflection_visibility = visibility,
         target_compatible_with = target_compatible_with,
-    )
-    fix_import_cmd = " ".join([
-        "SRCS=($(SRCS));",
-        "OUTS=($(OUTS));",
-        "for i in $${!SRCS[@]}; do",
-        "sed \"s/'.*reflection\\/reflection_pregenerated/'flatbuffers_reflection\\/reflection_generated/; s/_pregenerated/_generated/\" $${SRCS[i]} > $${OUTS[i]};",
-        "done",
-    ])
-    native.genrule(
-        name = name + "_reimporter",
-        srcs = pre_outs,
-        outs = outs,
-        cmd = fix_import_cmd,
-    )
-    ts_project(
-        name = name + "_ts",
-        srcs = outs,
-        declaration = True,
-        visibility = visibility,
-        compatible_with = compatible_with,
-        restricted_to = restricted_to,
-        target_compatible_with = target_compatible_with,
-        tsconfig = {
-            "compilerOptions": {
-                "declaration": True,
-                "lib": [
-                    "ES2015",
-                    "ES2020.BigInt",
-                    "DOM",
-                ],
-                "module": "commonjs",
-                "moduleResolution": "node",
-                "noUnusedLocals": True,
-                "strict": True,
-                "types": ["node"],
-            },
-        },
-        deps = deps + ["@com_github_google_flatbuffers//ts:flatbuffers"] + (["@com_github_google_flatbuffers//reflection/ts:reflection_ts_fbs"] if include_reflection else []),
+        flatc_path = "@com_github_google_flatbuffers//ts:compile_flat_file",
     )
     js_library(
         name = name,
@@ -122,7 +78,7 @@ def flatbuffer_ts_library(
         compatible_with = compatible_with,
         restricted_to = restricted_to,
         target_compatible_with = target_compatible_with,
-        deps = [name + "_ts"],
+        srcs = outs,
         package_name = package_name,
     )
     native.filegroup(