build: apply angular bazel ng_module fix to unblock framework

Due to our weird cyclic dependency with the framework repository,
we need to apply changes from angular/angular#36971
before the PR can actually land in framework. This is because the
changes of that PR fail in the components repo job as we apply patches
that conflict with the new changes.

At the same time though, we cannot make the components repo compatible
until the framework PR landed. We work around this as usually done, by
applying the upstream changes through a patch. Then we can resolve
conflicts and the framework PR can land. Eventually we can then
remove the patch again from the components repo.

Author: devversion

tools/postinstall/@angular_bazel_ivy_flat_module.patch

@@ -0,0 +1,57 @@
+diff --git node_modules/@angular/bazel/src/ng_module.bzl node_modules/@angular/bazel/src/ng_module.bzl
+index 9480c4b679dc..cf6f8ebaf437 100644
+--- node_modules/@angular/bazel/src/ng_module.bzl
++++ node_modules/@angular/bazel/src/ng_module.bzl
+@@ -334,8 +334,11 @@ def _ngc_tsconfig(ctx, files, srcs, **kwargs):
+         "angularCompilerOptions": angular_compiler_options,
+     })
+
++def _has_target_angular_summaries(target):
++    return hasattr(target, "angular") and hasattr(target.angular, "summaries")
++
+ def _collect_summaries_aspect_impl(target, ctx):
+-    results = depset(target.angular.summaries if hasattr(target, "angular") else [])
++    results = depset(target.angular.summaries if _has_target_angular_summaries(target) else [])
+
+     # If we are visiting empty-srcs ts_library, this is a re-export
+     srcs = ctx.rule.attr.srcs if hasattr(ctx.rule.attr, "srcs") else []
+@@ -343,7 +346,7 @@ def _collect_summaries_aspect_impl(target, ctx):
+     # "re-export" rules should expose all the files of their deps
+     if not srcs and hasattr(ctx.rule.attr, "deps"):
+         for dep in ctx.rule.attr.deps:
+-            if (hasattr(dep, "angular")):
++            if (_has_target_angular_summaries(dep)):
+                 results = depset(dep.angular.summaries, transitive = [results])
+
+     return struct(collect_summaries_aspect_result = results)
+@@ -588,20 +591,23 @@ def ng_module_impl(ctx, ts_compile_actions):
+
+     outs = _expected_outs(ctx)
+
++    providers["angular"] = {}
++
+     if is_legacy_ngc:
+-        providers["angular"] = {
+-            "summaries": outs.summaries,
+-            "metadata": outs.metadata,
+-        }
++        providers["angular"]["summaries"] = outs.summaries
++        providers["angular"]["metadata"] = outs.metadata
+         providers["ngc_messages"] = outs.i18n_messages
+
+-    if is_legacy_ngc and _should_produce_flat_module_outs(ctx):
+-        if len(outs.metadata) > 1:
++    if _should_produce_flat_module_outs(ctx):
++        # Sanity error if more than one metadata file has been created in the
++        # legacy ngc compiler while a flat module should be produced.
++        if is_legacy_ngc and len(outs.metadata) > 1:
+             fail("expecting exactly one metadata output for " + str(ctx.label))
+
+         providers["angular"]["flat_module_metadata"] = struct(
+             module_name = ctx.attr.module_name,
+-            metadata_file = outs.metadata[0],
++            # Metadata files are only generated in the legacy ngc compiler.
++            metadata_file = outs.metadata[0] if is_legacy_ngc else None,
+             typings_file = outs.bundle_index_typings,
+             flat_module_out_file = _flat_module_out_file(ctx),
+         )

tools/postinstall/apply-patches.js

@@ -12,7 +12,7 @@ const fs = require('fs');
  * Version of the post install patch. Needs to be incremented when
  * existing patches or edits have been modified.
  */
-const PATCH_VERSION = 5;
+const PATCH_VERSION = 6;
 
 /** Path to the project directory. */
 const projectDir = path.join(__dirname, '../..');
@@ -72,13 +72,13 @@ searchAndReplace(
     `$1#\n$2results = depset(dep.angular.metadata, transitive = [results])`,
     'node_modules/@angular/bazel/src/ng_module.bzl');
 searchAndReplace(
-    /^((\s*)results = depset\(target.angular.summaries if hasattr\(target, "angular"\) else \[]\))$/m,
-    `$1#\n$2results = depset(target.angular.metadata if hasattr(target, "angular") else [], transitive = [results])`,
+    /^((\s*)results = depset\(target.angular\.summaries if _has_target_angular_summaries\(target\) else \[]\))$/m,
+    `$1#\n$2results = depset(target.angular.metadata if _has_target_angular_summaries(target) else [], transitive = [results])`,
     'node_modules/@angular/bazel/src/ng_module.bzl');
 // Ensure that "metadata" of transitive dependencies can be collected.
 searchAndReplace(
-    /("metadata": outs.metadata),/,
-    `$1 + [m for dep in ctx.attr.deps if hasattr(dep, "angular") for m in dep.angular.metadata],`,
+    /providers\["angular"]\["metadata"] = outs\.metadata/,
+    `$& + [m for dep in ctx.attr.deps if (hasattr(dep, "angular") and hasattr(dep.angular, "metadata")) for m in dep.angular.metadata]`,
     'node_modules/@angular/bazel/src/ng_module.bzl');
 
 // Workaround for: https://github.com/bazelbuild/rules_nodejs/issues/1208.
@@ -89,7 +89,15 @@ try {
   // Can be removed once @angular/bazel is updated here to include this patch.
   // try/catch needed for this the material CI tests to work in angular/repo
   applyPatch(path.join(__dirname, './@angular_bazel_ng_module.patch'));
-} catch (_) {}
+} catch {}
+
+try {
+  // Temporary patch pre-req for https://github.com/angular/angular/pull/36971.
+  // Can be removed once @angular/bazel is updated here to include this patch.
+  // try/catch needed for this as the framework repo has this patch already applied,
+  // and re-applying again causes an error.
+  applyPatch(path.join(__dirname, './@angular_bazel_ivy_flat_module.patch'));
+} catch {}
 
 // Workaround for https://github.com/angular/angular/issues/33452:
 searchAndReplace(/angular_compiler_options = {/, `$&
@@ -177,7 +185,8 @@ function searchAndReplace(search, replacement, relativeFilePath) {
   fileEdits.push(originalContent => {
     const newFileContent = originalContent.replace(search, replacement);
     if (originalContent === newFileContent) {
-      throw Error(`Could not perform replacement in: ${filePath}.`);
+      throw Error(`Could not perform replacement in: ${filePath}.\n` +
+          `Searched for pattern: ${search}`);
     }
     return newFileContent;
   });