feat(ivy): setup boilerplate for component indexing API (#30961)

Set up the skeleton for a compiler API that indexes components and their
templates on an independent indexing step.

Part of #30959

PR Close #30961

packages/compiler-cli/src/ngtsc/transform/BUILD.bazel

@@ -12,6 +12,7 @@ ts_library(
         "//packages/compiler-cli/src/ngtsc/diagnostics",
         "//packages/compiler-cli/src/ngtsc/imports",
         "//packages/compiler-cli/src/ngtsc/incremental",
+        "//packages/compiler-cli/src/ngtsc/indexer",
         "//packages/compiler-cli/src/ngtsc/perf",
         "//packages/compiler-cli/src/ngtsc/reflection",
         "//packages/compiler-cli/src/ngtsc/scope",

packages/compiler-cli/src/ngtsc/transform/src/api.ts

@@ -10,6 +10,7 @@ import {ConstantPool, Expression, Statement, Type} from '@angular/compiler';
 import * as ts from 'typescript';
 
 import {Reexport} from '../../imports';
+import {IndexingContext} from '../../indexer';
 import {ClassDeclaration, Decorator} from '../../reflection';
 import {TypeCheckContext} from '../../typecheck';
 
@@ -76,6 +77,13 @@ export interface DecoratorHandler<A, M> {
    */
   analyze(node: ClassDeclaration, metadata: M): AnalysisOutput<A>;
 
+  /**
+   * Registers information about the decorator for the indexing phase in a
+   * `IndexingContext`, which stores information about components discovered in the
+   * program.
+   */
+  index?(context: IndexingContext, node: ClassDeclaration, metadata: M): void;
+
   /**
    * Perform resolution on the given decorator along with the result of analysis.
    *

packages/compiler-cli/src/ngtsc/transform/src/compilation.ts

@@ -12,6 +12,7 @@ import * as ts from 'typescript';
 import {ErrorCode, FatalDiagnosticError} from '../../diagnostics';
 import {ImportRewriter} from '../../imports';
 import {IncrementalState} from '../../incremental';
+import {IndexingContext} from '../../indexer';
 import {PerfRecorder} from '../../perf';
 import {ClassDeclaration, ReflectionHost, isNamedClassDeclaration, reflectNameOfDeclaration} from '../../reflection';
 import {LocalModuleScopeRegistry} from '../../scope';
@@ -250,6 +251,11 @@ export class IvyCompilation {
     }
   }
 
+  /**
+   * Feeds components discovered in the compilation to a context for indexing.
+   */
+  index(context: IndexingContext) { throw new Error('Method not implemented.'); }
+
   resolve(): void {
     const resolveSpan = this.perf.start('resolve');
     this.ivyClasses.forEach((ivyClass, node) => {