diff --git a/packages/compiler-cli/ngcc/src/dependencies/commonjs_dependency_host.ts b/packages/compiler-cli/ngcc/src/dependencies/commonjs_dependency_host.ts
index 2fc8338b50..01e9d55e9c 100644
--- a/packages/compiler-cli/ngcc/src/dependencies/commonjs_dependency_host.ts
+++ b/packages/compiler-cli/ngcc/src/dependencies/commonjs_dependency_host.ts
@@ -8,7 +8,6 @@
 import * as ts from 'typescript';
 import {AbsoluteFsPath} from '../../../src/ngtsc/file_system';
 import {isRequireCall} from '../host/commonjs_host';
-import {resolveFileWithPostfixes} from '../utils';
 import {DependencyHostBase} from './dependency_host';
 import {ResolvedDeepImport, ResolvedRelativeModule} from './module_resolver';
 
@@ -31,11 +30,7 @@ export class CommonJsDependencyHost extends DependencyHostBase {
   protected recursivelyFindDependencies(
       file: AbsoluteFsPath, dependencies: Set<AbsoluteFsPath>, missing: Set<string>,
       deepImports: Set<AbsoluteFsPath>, alreadySeen: Set<AbsoluteFsPath>): void {
-    const resolvedFile = resolveFileWithPostfixes(this.fs, file, ['', '.js', '/index.js']);
-    if (resolvedFile === null) {
-      return;
-    }
-    const fromContents = this.fs.readFile(resolvedFile);
+    const fromContents = this.fs.readFile(file);
 
     if (!this.hasRequireCalls(fromContents)) {
       // Avoid parsing the source file as there are no imports.
@@ -43,8 +38,8 @@ export class CommonJsDependencyHost extends DependencyHostBase {
     }
 
     // Parse the source into a TypeScript AST and then walk it looking for imports and re-exports.
-    const sf = ts.createSourceFile(
-        resolvedFile, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
+    const sf =
+        ts.createSourceFile(file, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
 
     for (const statement of sf.statements) {
       const declarations =
@@ -52,7 +47,7 @@ export class CommonJsDependencyHost extends DependencyHostBase {
       for (const declaration of declarations) {
         if (declaration.initializer && isRequireCall(declaration.initializer)) {
           const importPath = declaration.initializer.arguments[0].text;
-          const resolvedModule = this.moduleResolver.resolveModuleImport(importPath, resolvedFile);
+          const resolvedModule = this.moduleResolver.resolveModuleImport(importPath, file);
           if (resolvedModule) {
             if (resolvedModule instanceof ResolvedRelativeModule) {
               const internalDependency = resolvedModule.modulePath;
diff --git a/packages/compiler-cli/ngcc/src/dependencies/dependency_host.ts b/packages/compiler-cli/ngcc/src/dependencies/dependency_host.ts
index b5b2a618d5..900b44a992 100644
--- a/packages/compiler-cli/ngcc/src/dependencies/dependency_host.ts
+++ b/packages/compiler-cli/ngcc/src/dependencies/dependency_host.ts
@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {AbsoluteFsPath, FileSystem, PathSegment} from '../../../src/ngtsc/file_system';
+import {resolveFileWithPostfixes} from '../utils';
+
 import {ModuleResolver} from './module_resolver';
 
 export interface DependencyHost {
@@ -32,10 +34,15 @@ export abstract class DependencyHostBase implements DependencyHost {
     const dependencies = new Set<AbsoluteFsPath>();
     const missing = new Set<AbsoluteFsPath|PathSegment>();
     const deepImports = new Set<AbsoluteFsPath>();
-    const alreadySeen = new Set<AbsoluteFsPath>();
 
-    this.recursivelyFindDependencies(
-        entryPointPath, dependencies, missing, deepImports, alreadySeen);
+    const resolvedFile =
+        resolveFileWithPostfixes(this.fs, entryPointPath, ['', '.js', '/index.js']);
+    if (resolvedFile !== null) {
+      const alreadySeen = new Set<AbsoluteFsPath>();
+      this.recursivelyFindDependencies(
+          resolvedFile, dependencies, missing, deepImports, alreadySeen);
+    }
+
     return {dependencies, missing, deepImports};
   }
 
diff --git a/packages/compiler-cli/ngcc/src/dependencies/esm_dependency_host.ts b/packages/compiler-cli/ngcc/src/dependencies/esm_dependency_host.ts
index e164328282..2b6b394d85 100644
--- a/packages/compiler-cli/ngcc/src/dependencies/esm_dependency_host.ts
+++ b/packages/compiler-cli/ngcc/src/dependencies/esm_dependency_host.ts
@@ -7,7 +7,6 @@
  */
 import * as ts from 'typescript';
 import {AbsoluteFsPath} from '../../../src/ngtsc/file_system';
-import {resolveFileWithPostfixes} from '../utils';
 import {DependencyHostBase} from './dependency_host';
 import {ResolvedDeepImport, ResolvedRelativeModule} from './module_resolver';
 
@@ -30,11 +29,7 @@ export class EsmDependencyHost extends DependencyHostBase {
   protected recursivelyFindDependencies(
       file: AbsoluteFsPath, dependencies: Set<AbsoluteFsPath>, missing: Set<string>,
       deepImports: Set<string>, alreadySeen: Set<AbsoluteFsPath>): void {
-    const resolvedFile = resolveFileWithPostfixes(this.fs, file, ['', '.js', '/index.js']);
-    if (resolvedFile === null) {
-      return;
-    }
-    const fromContents = this.fs.readFile(resolvedFile);
+    const fromContents = this.fs.readFile(file);
 
     if (!hasImportOrReexportStatements(fromContents)) {
       // Avoid parsing the source file as there are no imports.
@@ -42,8 +37,8 @@ export class EsmDependencyHost extends DependencyHostBase {
     }
 
     // Parse the source into a TypeScript AST and then walk it looking for imports and re-exports.
-    const sf = ts.createSourceFile(
-        resolvedFile, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
+    const sf =
+        ts.createSourceFile(file, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
     sf.statements
         // filter out statements that are not imports or reexports
         .filter(isStringImportOrReexport)
@@ -51,7 +46,7 @@ export class EsmDependencyHost extends DependencyHostBase {
         .map(stmt => stmt.moduleSpecifier.text)
         // Resolve this module id into an absolute path
         .forEach(importPath => {
-          const resolvedModule = this.moduleResolver.resolveModuleImport(importPath, resolvedFile);
+          const resolvedModule = this.moduleResolver.resolveModuleImport(importPath, file);
           if (resolvedModule) {
             if (resolvedModule instanceof ResolvedRelativeModule) {
               const internalDependency = resolvedModule.modulePath;
diff --git a/packages/compiler-cli/ngcc/src/dependencies/umd_dependency_host.ts b/packages/compiler-cli/ngcc/src/dependencies/umd_dependency_host.ts
index 64ca73d25a..0664dfce88 100644
--- a/packages/compiler-cli/ngcc/src/dependencies/umd_dependency_host.ts
+++ b/packages/compiler-cli/ngcc/src/dependencies/umd_dependency_host.ts
@@ -8,7 +8,6 @@
 import * as ts from 'typescript';
 import {AbsoluteFsPath} from '../../../src/ngtsc/file_system';
 import {getImportsOfUmdModule, parseStatementForUmdModule} from '../host/umd_host';
-import {resolveFileWithPostfixes} from '../utils';
 import {DependencyHostBase} from './dependency_host';
 import {ResolvedDeepImport, ResolvedRelativeModule} from './module_resolver';
 
@@ -31,11 +30,7 @@ export class UmdDependencyHost extends DependencyHostBase {
   protected recursivelyFindDependencies(
       file: AbsoluteFsPath, dependencies: Set<AbsoluteFsPath>, missing: Set<string>,
       deepImports: Set<string>, alreadySeen: Set<AbsoluteFsPath>): void {
-    const resolvedFile = resolveFileWithPostfixes(this.fs, file, ['', '.js', '/index.js']);
-    if (resolvedFile === null) {
-      return;
-    }
-    const fromContents = this.fs.readFile(resolvedFile);
+    const fromContents = this.fs.readFile(file);
 
     if (!this.hasRequireCalls(fromContents)) {
       // Avoid parsing the source file as there are no imports.
@@ -43,8 +38,8 @@ export class UmdDependencyHost extends DependencyHostBase {
     }
 
     // Parse the source into a TypeScript AST and then walk it looking for imports and re-exports.
-    const sf = ts.createSourceFile(
-        resolvedFile, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
+    const sf =
+        ts.createSourceFile(file, fromContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
 
     if (sf.statements.length !== 1) {
       return;
@@ -57,7 +52,7 @@ export class UmdDependencyHost extends DependencyHostBase {
     }
 
     umdImports.forEach(umdImport => {
-      const resolvedModule = this.moduleResolver.resolveModuleImport(umdImport.path, resolvedFile);
+      const resolvedModule = this.moduleResolver.resolveModuleImport(umdImport.path, file);
       if (resolvedModule) {
         if (resolvedModule instanceof ResolvedRelativeModule) {
           const internalDependency = resolvedModule.modulePath;