fix(typescript): don't mix worker mode and linker

This causes hard-to-reproduce resource leaks as demonstrated in #1803
Also we didn't fully understand this before, for example if a worker process stayed running we'd never re-link under it when deps change
For now make the conservative fix to keep these two capabilities distinct

Fixes #1803

examples/angular/package.json

@@ -9,11 +9,11 @@
     },
     "dependencies": {
         "@angular/animations": "9.1.0",
-        "@angular/cdk": "9.0.0",
+        "@angular/cdk": "9.2.0",
         "@angular/common": "9.1.0",
         "@angular/core": "9.1.0",
         "@angular/forms": "9.1.0",
-        "@angular/material": "9.0.0",
+        "@angular/material": "9.2.0",
         "@angular/platform-browser": "9.1.0",
         "@angular/platform-browser-dynamic": "9.1.0",
         "@angular/platform-server": "^9.1.0",
@@ -61,7 +61,7 @@
         "rollup-plugin-commonjs": "^10.1.0",
         "rollup-plugin-node-resolve": "^5.2.0",
         "terser": "4.3.1",
-        "typescript": "3.6.4"
+        "typescript": "3.8.3"
     },
     "scripts": {
         "build": "bazelisk build //src:prodapp",

examples/angular/src/BUILD.bazel

@@ -53,6 +53,8 @@ ts_library(
     use_angular_plugin = True,
     deps = [
         "//src/app",
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/platform-browser",
         "@npm//@angular/router",

examples/angular/src/app/BUILD.bazel

@@ -17,6 +17,8 @@ ts_library(
         "//src/app/todos",
         "//src/app/todos/reducers",
         "//src/shared/material",
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/platform-browser",
         "@npm//@angular/router",
@@ -31,6 +33,8 @@ ts_library(
     use_angular_plugin = True,
     deps = [
         ":app",
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/platform-server",
     ],

examples/angular/src/app/hello-world/BUILD.bazel

@@ -24,6 +24,8 @@ ts_library(
     deps = [
         "//src/lib/shorten",
         "//src/shared/material",
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/forms",
         "@npm//@angular/router",

examples/angular/src/app/home/BUILD.bazel

@@ -9,6 +9,8 @@ ts_library(
     tsconfig = "//src:tsconfig.json",
     use_angular_plugin = True,
     deps = [
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/router",
     ],

examples/angular/src/app/todos/BUILD.bazel

@@ -23,6 +23,8 @@ ts_library(
     deps = [
         "//src/app/todos/reducers",
         "//src/shared/material",
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/common",
         "@npm//@angular/core",
         "@npm//@angular/forms",

examples/angular/src/shared/material/BUILD.bazel

@@ -8,6 +8,8 @@ ts_library(
     tsconfig = "//src:tsconfig.json",
     use_angular_plugin = True,
     deps = [
+        # Needed for the angular compiler plugin
+        "@npm//@angular/compiler-cli",
         "@npm//@angular/core",
         "@npm//@angular/material",
     ],

examples/angular/yarn.lock

@@ -44,10 +44,10 @@
     shelljs "0.8.2"
     tsickle "^0.38.0"
 
-"@angular/cdk@9.0.0":
-  version "9.0.0"
-  resolved "https://registry.yarnpkg.com/@angular/cdk/-/cdk-9.0.0.tgz#5734817ae97044f90d304fa0f25c9c1a7fa0bf96"
-  integrity sha512-2kYpyYbewIB6fubSIDMvSprJLNplRZoL/AtXW3od4dLyRxtzX+7iWTAtzUG/dhq8CKev0lpd1HENh5lLR/Lhjw==
+"@angular/cdk@9.2.0":
+  version "9.2.0"
+  resolved "https://registry.yarnpkg.com/@angular/cdk/-/cdk-9.2.0.tgz#587e4a9d5046fa89a68d8eddaee6b185e2915842"
+  integrity sha512-jeeznvNDpR9POuxzz8Y0zFvMynG9HCJo3ZPTqOjlOq8Lj8876+rLsHDvKEMeLdwlkdi1EweYJW1CLQzI+TwqDA==
   optionalDependencies:
     parse5 "^5.0.0"
 
@@ -115,10 +115,10 @@
   resolved "https://registry.yarnpkg.com/@angular/forms/-/forms-9.1.0.tgz#de14e34aa37bd41a28f93fee8666cd7f6393078c"
   integrity sha512-5GC8HQlPChPV+168zLlm4yj4syA6N9ChSKV0tmzj1zIfMcub1UAOaB9IYaXRHQsjPFh9OuQXwmkzScyAfhEVjA==
 
-"@angular/material@9.0.0":
-  version "9.0.0"
-  resolved "https://registry.yarnpkg.com/@angular/material/-/material-9.0.0.tgz#655bfd4d4047337e84480b9f92be8e81af375b92"
-  integrity sha512-QxN2rmR5mvg2YE1NoIGWLpbnmcJq0iFidzy6odzvN17+XkoCJBZ65IdYsHrJgfwGpoIy6bywuixrDHHcSh9I5w==
+"@angular/material@9.2.0":
+  version "9.2.0"
+  resolved "https://registry.yarnpkg.com/@angular/material/-/material-9.2.0.tgz#1b6f0a2e115f93885d7fc2dc4b258d8c9cf6821f"
+  integrity sha512-KKzEIVh6/m56m+Ao8p4PK0SyEr0574l3VP2swj1qPag3u+FYgemmXCGTaChrKdDsez+zeTCPXImBGXzE6NQ80Q==
 
 "@angular/platform-browser-dynamic@9.1.0":
   version "9.1.0"
@@ -6907,10 +6907,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@3.6.4:
-  version "3.6.4"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.6.4.tgz#b18752bb3792bc1a0281335f7f6ebf1bbfc5b91d"
-  integrity sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==
+typescript@3.8.3:
+  version "3.8.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.8.3.tgz#409eb8544ea0335711205869ec458ab109ee1061"
+  integrity sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==
 
 typescript@~3.5.3:
   version "3.5.3"

packages/typescript/src/internal/build_defs.bzl

@@ -140,34 +140,54 @@ def _compile_action(ctx, inputs, outputs, tsconfig_file, node_opts, description
     # Pass actual options for the node binary in the special "--node_options" argument.
     arguments = ["--node_options=%s" % opt for opt in node_opts]
 
-    # One at-sign makes this a params-file, enabling the worker strategy.
-    # Two at-signs escapes the argument so it's passed through to tsc_wrapped
-    # rather than the contents getting expanded.
-    if ctx.attr.supports_workers:
+    # We don't try to use the linker to launch the worker process
+    # because it causes bazel to spawn a new worker for every action
+    # See https://github.com/bazelbuild/rules_nodejs/issues/1803
+    # TODO: understand the interaction between linker and workers better
+    # When using plugins, we need the linker, so we disable workers for that case as well
+    if ctx.attr.supports_workers and not ctx.attr.use_angular_plugin:
+        # One at-sign makes this a params-file, enabling the worker strategy.
+        # Two at-signs escapes the argument so it's passed through to tsc_wrapped
+        # rather than the contents getting expanded.
         arguments.append("@@" + tsconfig_file.path)
-        mnemonic = "TypeScriptCompile"
+
+        # Spawn a plain action that runs worker process with no linker
+        ctx.actions.run(
+            progress_message = "Compiling TypeScript (%s) %s" % (description, ctx.label),
+            mnemonic = "TypeScriptCompile",
+            inputs = action_inputs,
+            outputs = action_outputs,
+            # Use the built-in shell environment
+            # Allow for users who set a custom shell that can locate standard binaries like tr and uname
+            # See https://github.com/NixOS/nixpkgs/issues/43955#issuecomment-407546331
+            use_default_shell_env = True,
+            arguments = arguments,
+            executable = ctx.executable.compiler,
+            execution_requirements = {
+                "supports-workers": "1",
+            },
+            env = {"COMPILATION_MODE": ctx.var["COMPILATION_MODE"]},
+        )
     else:
-        arguments.append("-p")
+        # TODO: if compiler is vanilla tsc, then we need the '-p' argument too
+        # arguments.append("-p")
         arguments.append(tsconfig_file.path)
-        mnemonic = "tsc"
 
-    run_node(
-        ctx,
-        progress_message = "Compiling TypeScript (%s) %s" % (description, ctx.label),
-        mnemonic = mnemonic,
-        inputs = action_inputs,
-        outputs = action_outputs,
-        # Use the built-in shell environment
-        # Allow for users who set a custom shell that can locate standard binaries like tr and uname
-        # See https://github.com/NixOS/nixpkgs/issues/43955#issuecomment-407546331
-        use_default_shell_env = True,
-        arguments = arguments,
-        executable = "compiler",
-        execution_requirements = {
-            "supports-workers": str(int(ctx.attr.supports_workers)),
-        },
-        env = {"COMPILATION_MODE": ctx.var["COMPILATION_MODE"]},
-    )
+        # Run with linker but not as a worker process
+        run_node(
+            ctx,
+            progress_message = "Compiling TypeScript (%s) %s" % (description, ctx.label),
+            mnemonic = "tsc",
+            inputs = action_inputs,
+            outputs = action_outputs,
+            # Use the built-in shell environment
+            # Allow for users who set a custom shell that can locate standard binaries like tr and uname
+            # See https://github.com/NixOS/nixpkgs/issues/43955#issuecomment-407546331
+            use_default_shell_env = True,
+            arguments = arguments,
+            executable = "compiler",
+            env = {"COMPILATION_MODE": ctx.var["COMPILATION_MODE"]},
+        )
 
     # Enable the replay_params in case an aspect needs to re-build this library.
     return struct(

packages/typescript/test/lit_plugin/BUILD.bazel

@@ -26,6 +26,10 @@ ts_library(
         "TS2322: \\[lit\\] Type '444' is not assignable to 'string",
         "TS2322: \\[lit\\] Type '{ field: number; }' is not assignable to '{ field: string; }'",
     ],
+    # We need the linker to set up a node_modules tree to discover the plugin
+    # but it isn't compatible with worker mode;
+    # see https://github.com/bazelbuild/rules_nodejs/issues/1803
+    supports_workers = False,
     tsconfig = ":tsconfig.json",
     deps = [
         "@npm//lit-element",