try a simple approach for default tsconfig

src/BUILD.bazel

@@ -1,11 +1,10 @@
 package(default_visibility = ["//visibility:public"])
 
-load("@angular//:index.bzl", "ng_module")
+load("//tools:defaults.bzl", "ng_module")
 
 ng_module(
     name = "src",
     srcs = glob(["*.ts"]),
-    tsconfig = ":tsconfig.json",
     deps = ["//src/hello-world"],
 )
 

src/hello-world/BUILD.bazel

@@ -1,8 +1,8 @@
 package(default_visibility = ["//visibility:public"])
 
-load("@angular//:index.bzl", "ng_module")
+load("//tools:defaults.bzl", "ng_module", "ts_library")
 load("@io_bazel_rules_sass//sass:sass.bzl", "sass_binary")
-load("@build_bazel_rules_typescript//:defs.bzl", "ts_library", "ts_web_test")
+load("@build_bazel_rules_typescript//:defs.bzl", "ts_web_test")
 
 sass_binary(
     name = "hello-world-styles",
@@ -20,7 +20,6 @@ ng_module(
         "hello-world.module.ts",
     ],
     assets = [":hello-world-styles"],
-    tsconfig = "//src:tsconfig.json",
     deps = [
         "//src/lib",
         "@rxjs",

src/lib/BUILD.bazel

@@ -1,6 +1,6 @@
 package(default_visibility = ["//visibility:public"])
 
-load("@build_bazel_rules_typescript//:defs.bzl", "ts_library")
+load("//tools:defaults.bzl", "ts_library")
 
 ts_library(
     name = "lib",

src/tsconfig.json

@@ -1,5 +1,6 @@
 {
     "compilerOptions": {
+        "strict": true,
         "lib": [
             "dom",
             "es5",

tools/BUILD

@@ -0,0 +1 @@
+# Marker that this is a Bazel package

tools/defaults.bzl

@@ -0,0 +1,14 @@
+load("@build_bazel_rules_typescript//:defs.bzl", _ts_library = "ts_library")
+load("@angular//:index.bzl", _ng_module = "ng_module")
+
+DEFAULT_TSCONFIG = "//src:tsconfig.json"
+
+def ts_library(tsconfig = None, **kwargs):
+  if not tsconfig:
+    tsconfig = DEFAULT_TSCONFIG
+  _ts_library(tsconfig = tsconfig, **kwargs)
+
+def ng_module(tsconfig = None, **kwargs):
+  if not tsconfig:
+    tsconfig = DEFAULT_TSCONFIG
+  _ng_module(tsconfig = tsconfig, **kwargs)