refactor(compiler): separate `compileFactoryFunction()` from `compileInjector()` (#41022)

This commit moves the creation of the injector's factory function
out so that it can be more easily refactored further.

PR Close #41022

packages/compiler-cli/src/ngtsc/annotations/src/ng_module.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {compileInjector, compileNgModule, CUSTOM_ELEMENTS_SCHEMA, Expression, ExternalExpr, InvokeFunctionExpr, LiteralArrayExpr, LiteralExpr, NO_ERRORS_SCHEMA, R3Identifiers, R3InjectorMetadata, R3NgModuleMetadata, R3Reference, SchemaMetadata, Statement, STRING_TYPE, WrappedNodeExpr} from '@angular/compiler';
+import {compileFactoryFunction, compileInjector, compileNgModule, CUSTOM_ELEMENTS_SCHEMA, Expression, ExternalExpr, Identifiers as R3, InvokeFunctionExpr, LiteralArrayExpr, LiteralExpr, NO_ERRORS_SCHEMA, R3FactoryTarget, R3Identifiers, R3InjectorMetadata, R3NgModuleMetadata, R3Reference, SchemaMetadata, Statement, STRING_TYPE, WrappedNodeExpr} from '@angular/compiler';
 import * as ts from 'typescript';
 
 import {ErrorCode, FatalDiagnosticError, makeDiagnostic, makeRelatedInformation} from '../../diagnostics';
@@ -449,21 +449,33 @@ export class NgModuleDecoratorHandler implements
   }
 
   compileFull(
-      node: ClassDeclaration, analysis: Readonly<NgModuleAnalysis>,
+      node: ClassDeclaration, {inj, mod, metadataStmt, declarations}: Readonly<NgModuleAnalysis>,
       resolution: Readonly<NgModuleResolution>): CompileResult[] {
+    const factoryFn = compileFactoryFunction({
+      name: inj.name,
+      type: inj.type,
+      internalType: inj.internalType,
+      typeArgumentCount: 0,
+      deps: inj.deps,
+      injectFn: R3.inject,
+      target: R3FactoryTarget.NgModule,
+    });
+
     //  Merge the injector imports (which are 'exports' that were later found to be NgModules)
     //  computed during resolution with the ones from analysis.
-    const ngInjectorDef = compileInjector({
-      ...analysis.inj,
-      imports: [...analysis.inj.imports, ...resolution.injectorImports],
-    });
-    const ngModuleDef = compileNgModule(analysis.mod);
+    const ngInjectorDef = compileInjector(
+        {
+          ...inj,
+          imports: [...inj.imports, ...resolution.injectorImports],
+        },
+        factoryFn);
+    const ngModuleDef = compileNgModule(mod);
     const ngModuleStatements = ngModuleDef.additionalStatements;
-    if (analysis.metadataStmt !== null) {
-      ngModuleStatements.push(analysis.metadataStmt);
+    if (metadataStmt !== null) {
+      ngModuleStatements.push(metadataStmt);
     }
     const context = getSourceFile(node);
-    for (const decl of analysis.declarations) {
+    for (const decl of declarations) {
       const remoteScope = this.scopeRegistry.getRemoteScope(decl.node);
       if (remoteScope !== null) {
         const directives = remoteScope.directives.map(

packages/compiler/src/jit_compiler_facade.ts

@@ -88,7 +88,16 @@ export class CompilerFacadeImpl implements CompilerFacade {
       providers: new WrappedNodeExpr(facade.providers),
       imports: facade.imports.map(i => new WrappedNodeExpr(i)),
     };
-    const res = compileInjector(meta);
+    const factoryFn = compileFactoryFunction({
+      name: meta.name,
+      type: meta.type,
+      internalType: meta.internalType,
+      typeArgumentCount: 0,
+      deps: meta.deps,
+      injectFn: Identifiers.inject,
+      target: R3FactoryTarget.NgModule,
+    });
+    const res = compileInjector(meta, factoryFn);
     return this.jitExpression(res.expression, angularCoreEnv, sourceMapUrl, res.statements);
   }
 

packages/compiler/src/render3/r3_module_compiler.ts

@@ -8,7 +8,7 @@
 
 import * as o from '../output/output_ast';
 
-import {compileFactoryFunction, R3DependencyMetadata, R3FactoryTarget} from './r3_factory';
+import {R3DependencyMetadata, R3FactoryFn} from './r3_factory';
 import {Identifiers as R3} from './r3_identifiers';
 import {jitOnlyGuardedExpression, mapToMapExpression, R3Reference} from './util';
 
@@ -230,19 +230,9 @@ export interface R3InjectorMetadata {
   imports: o.Expression[];
 }
 
-export function compileInjector(meta: R3InjectorMetadata): R3InjectorDef {
-  const result = compileFactoryFunction({
-    name: meta.name,
-    type: meta.type,
-    internalType: meta.internalType,
-    typeArgumentCount: 0,
-    deps: meta.deps,
-    injectFn: R3.inject,
-    target: R3FactoryTarget.NgModule,
-  });
-  const definitionMap = {
-    factory: result.factory,
-  } as {factory: o.Expression, providers: o.Expression, imports: o.Expression};
+export function compileInjector(
+    meta: R3InjectorMetadata, {factory, statements}: R3FactoryFn): R3InjectorDef {
+  const definitionMap: Record<string, o.Expression> = {factory};
 
   if (meta.providers !== null) {
     definitionMap.providers = meta.providers;
@@ -256,7 +246,7 @@ export function compileInjector(meta: R3InjectorMetadata): R3InjectorDef {
       o.importExpr(R3.defineInjector).callFn([mapToMapExpression(definitionMap)], undefined, true);
   const type =
       new o.ExpressionType(o.importExpr(R3.InjectorDef, [new o.ExpressionType(meta.type.type)]));
-  return {expression, type, statements: result.statements};
+  return {expression, type, statements};
 }
 
 function tupleTypeOf(exp: R3Reference[]): o.Type {