diff --git a/packages/compiler-cli/src/ngcc/src/analysis/decoration_analyzer.ts b/packages/compiler-cli/src/ngcc/src/analysis/decoration_analyzer.ts
index 938bb5974f..e83a953710 100644
--- a/packages/compiler-cli/src/ngcc/src/analysis/decoration_analyzer.ts
+++ b/packages/compiler-cli/src/ngcc/src/analysis/decoration_analyzer.ts
@@ -30,6 +30,9 @@ export interface DecorationAnalysis {
   constantPool: ConstantPool;
 }
 
+export type DecorationAnalyses = Map<ts.SourceFile, DecorationAnalysis>;
+export const DecorationAnalyses = Map;
+
 export interface MatchingHandler<A, M> {
   handler: DecoratorHandler<A, M>;
   match: M;
@@ -63,12 +66,30 @@ export class DecorationAnalyzer {
       private typeChecker: ts.TypeChecker, private host: NgccReflectionHost,
       private rootDirs: string[], private isCore: boolean) {}
 
+  /**
+   * Analyze a program to find all the decorated files should be transformed.
+   * @param program The program whose files should be analysed.
+   * @returns a map of the source files to the analysis for those files.
+   */
+  analyzeProgram(program: ts.Program): DecorationAnalyses {
+    const analyzedFiles = new DecorationAnalyses();
+    program.getRootFileNames().forEach(fileName => {
+      const entryPoint = program.getSourceFile(fileName) !;
+      const decoratedFiles = this.host.findDecoratedFiles(entryPoint);
+      decoratedFiles.forEach(
+          decoratedFile =>
+              analyzedFiles.set(decoratedFile.sourceFile, this.analyzeFile(decoratedFile)));
+    });
+    return analyzedFiles;
+  }
+
   /**
    * Analyze a decorated file to generate the information about decorated classes that
    * should be converted to use ivy definitions.
    * @param file The file to be analysed for decorated classes.
+   * @returns the analysis of the file
    */
-  analyzeFile(file: DecoratedFile): DecorationAnalysis {
+  protected analyzeFile(file: DecoratedFile): DecorationAnalysis {
     const constantPool = new ConstantPool();
     const analyzedClasses =
         file.decoratedClasses.map(clazz => this.analyzeClass(constantPool, clazz))
diff --git a/packages/compiler-cli/src/ngcc/test/analysis/decoration_analyzer_spec.ts b/packages/compiler-cli/src/ngcc/test/analysis/decoration_analyzer_spec.ts
index 8d4041a6f5..42133d1240 100644
--- a/packages/compiler-cli/src/ngcc/test/analysis/decoration_analyzer_spec.ts
+++ b/packages/compiler-cli/src/ngcc/test/analysis/decoration_analyzer_spec.ts
@@ -9,23 +9,21 @@ import * as ts from 'typescript';
 
 import {Decorator} from '../../../ngtsc/host';
 import {DecoratorHandler} from '../../../ngtsc/transform';
-import {DecorationAnalysis, DecorationAnalyzer} from '../../src/analysis/decoration_analyzer';
-import {DecoratedClass} from '../../src/host/decorated_class';
-import {DecoratedFile} from '../../src/host/decorated_file';
+import {DecorationAnalyses, DecorationAnalyzer} from '../../src/analysis/decoration_analyzer';
 import {Fesm2015ReflectionHost} from '../../src/host/fesm2015_host';
 
-import {getDeclaration, makeProgram} from '../helpers/utils';
+import {makeProgram} from '../helpers/utils';
 
 const TEST_PROGRAM = {
   name: 'test.js',
   contents: `
   import {Component, Injectable} from '@angular/core';
 
-  @Component()
   export class MyComponent {}
+  MyComponent.decorators = [{type: Component}];
 
-  @Injectable()
   export class MyService {}
+  MyService.decorators = [{type: Injectable}];
   `
 };
 
@@ -50,49 +48,26 @@ function createTestHandler() {
   return handler;
 }
 
-function createParsedFile(program: ts.Program) {
-  const file = new DecoratedFile(program.getSourceFile('test.js') !);
-
-  const componentClass = getDeclaration(program, 'test.js', 'MyComponent', ts.isClassDeclaration);
-  file.decoratedClasses.push(
-      new DecoratedClass('MyComponent', {} as any, [{
-                           name: 'Component',
-                           import: {from: '@angular/core', name: 'Component'},
-                           node: null as any,
-                           args: null
-                         }]));
-
-  const serviceClass = getDeclaration(program, 'test.js', 'MyService', ts.isClassDeclaration);
-  file.decoratedClasses.push(
-      new DecoratedClass('MyService', {} as any, [{
-                           name: 'Injectable',
-                           import: {from: '@angular/core', name: 'Injectable'},
-                           node: null as any,
-                           args: null
-                         }]));
-
-  return file;
-}
-
 describe('DecorationAnalyzer', () => {
-  describe('analyzeFile()', () => {
+  describe('analyzeProgram()', () => {
     let program: ts.Program;
     let testHandler: jasmine.SpyObj<DecoratorHandler<any, any>>;
-    let result: DecorationAnalysis;
+    let result: DecorationAnalyses;
 
     beforeEach(() => {
       program = makeProgram(TEST_PROGRAM);
-      const file = createParsedFile(program);
       const analyzer = new DecorationAnalyzer(
           program.getTypeChecker(), new Fesm2015ReflectionHost(false, program.getTypeChecker()),
           [''], false);
       testHandler = createTestHandler();
       analyzer.handlers = [testHandler];
-      result = analyzer.analyzeFile(file);
+      result = analyzer.analyzeProgram(program);
     });
 
-    it('should return an object containing a reference to the original source file',
-       () => { expect(result.sourceFile).toBe(program.getSourceFile('test.js') !); });
+    it('should return an object containing a reference to the original source file', () => {
+      const file = program.getSourceFile(TEST_PROGRAM.name) !;
+      expect(result.get(file) !.sourceFile).toBe(file);
+    });
 
     it('should call detect on the decorator handlers with each class from the parsed file', () => {
       expect(testHandler.detect).toHaveBeenCalledTimes(2);
@@ -103,8 +78,10 @@ describe('DecorationAnalyzer', () => {
     });
 
     it('should return an object containing the classes that were analyzed', () => {
-      expect(result.analyzedClasses.length).toEqual(1);
-      expect(result.analyzedClasses[0].name).toEqual('MyComponent');
+      const file = program.getSourceFile(TEST_PROGRAM.name) !;
+      const analysis = result.get(file) !;
+      expect(analysis.analyzedClasses.length).toEqual(1);
+      expect(analysis.analyzedClasses[0].name).toEqual('MyComponent');
     });
 
     it('should analyze and compile the classes that are detected', () => {