diff --git a/packages/compiler-cli/ngcc/src/host/esm2015_host.ts b/packages/compiler-cli/ngcc/src/host/esm2015_host.ts
index 41bc67ba50..24de49a39c 100644
--- a/packages/compiler-cli/ngcc/src/host/esm2015_host.ts
+++ b/packages/compiler-cli/ngcc/src/host/esm2015_host.ts
@@ -12,7 +12,7 @@ import {AbsoluteFsPath} from '../../../src/ngtsc/file_system';
 import {ClassDeclaration, ClassMember, ClassMemberKind, ClassSymbol, CtorParameter, Declaration, Decorator, TypeScriptReflectionHost, isDecoratorIdentifier, reflectObjectLiteral} from '../../../src/ngtsc/reflection';
 import {Logger} from '../logging/logger';
 import {BundleProgram} from '../packages/bundle_program';
-import {findAll, getNameText, hasNameIdentifier, isDefined} from '../utils';
+import {findAll, getNameText, hasNameIdentifier, isDefined, stripDollarSuffix} from '../utils';
 
 import {ModuleWithProvidersFunction, NgccReflectionHost, PRE_R3_MARKER, SwitchableVariableDeclaration, isSwitchableVariableDeclaration} from './ngcc_host';
 
@@ -889,14 +889,8 @@ export class Esm2015ReflectionHost extends TypeScriptReflectionHost implements N
     }
     const call = expression;
 
-    const helperCallFn =
-        ts.isPropertyAccessExpression(call.expression) ? call.expression.name : call.expression;
-    if (!ts.isIdentifier(helperCallFn)) {
-      return null;
-    }
-
-    const name = helperCallFn.text;
-    if (name === '__metadata') {
+    const helperName = getCalleeName(call);
+    if (helperName === '__metadata') {
       // This is a `tslib.__metadata` call, reflect to arguments into a `ParameterTypes` object
       // if the metadata key is "design:paramtypes".
       const key = call.arguments[0];
@@ -915,7 +909,7 @@ export class Esm2015ReflectionHost extends TypeScriptReflectionHost implements N
       };
     }
 
-    if (name === '__param') {
+    if (helperName === '__param') {
       // This is a `tslib.__param` call that is reflected into a `ParameterDecorators` object.
       const indexArg = call.arguments[0];
       const index = indexArg && ts.isNumericLiteral(indexArg) ? parseInt(indexArg.text, 10) : NaN;
@@ -1613,10 +1607,10 @@ export function getPropertyValueFromSymbol(propSymbol: ts.Symbol): ts.Expression
  */
 function getCalleeName(call: ts.CallExpression): string|null {
   if (ts.isIdentifier(call.expression)) {
-    return call.expression.text;
+    return stripDollarSuffix(call.expression.text);
   }
   if (ts.isPropertyAccessExpression(call.expression)) {
-    return call.expression.name.text;
+    return stripDollarSuffix(call.expression.name.text);
   }
   return null;
 }
diff --git a/packages/compiler-cli/ngcc/src/host/esm5_host.ts b/packages/compiler-cli/ngcc/src/host/esm5_host.ts
index a18a30bd4e..723db3dc79 100644
--- a/packages/compiler-cli/ngcc/src/host/esm5_host.ts
+++ b/packages/compiler-cli/ngcc/src/host/esm5_host.ts
@@ -10,7 +10,7 @@ import * as ts from 'typescript';
 
 import {ClassDeclaration, ClassMember, ClassMemberKind, ClassSymbol, CtorParameter, Declaration, Decorator, FunctionDefinition, Parameter, TsHelperFn, isNamedVariableDeclaration, reflectObjectLiteral} from '../../../src/ngtsc/reflection';
 import {isFromDtsFile} from '../../../src/ngtsc/util/src/typescript';
-import {getNameText, hasNameIdentifier} from '../utils';
+import {getNameText, hasNameIdentifier, stripDollarSuffix} from '../utils';
 
 import {Esm2015ReflectionHost, ParamInfo, getPropertyValueFromSymbol, isAssignmentStatement} from './esm2015_host';
 
@@ -659,7 +659,9 @@ function reflectArrayElement(element: ts.Expression) {
  * helper.
  */
 function getTsHelperFn(node: ts.NamedDeclaration): TsHelperFn|null {
-  const name = node.name !== undefined && ts.isIdentifier(node.name) && node.name.text;
+  const name = node.name !== undefined && ts.isIdentifier(node.name) ?
+      stripDollarSuffix(node.name.text) :
+      null;
 
   if (name === '__spread') {
     return TsHelperFn.Spread;
diff --git a/packages/compiler-cli/ngcc/src/utils.ts b/packages/compiler-cli/ngcc/src/utils.ts
index c3eb08378b..1b221fdde3 100644
--- a/packages/compiler-cli/ngcc/src/utils.ts
+++ b/packages/compiler-cli/ngcc/src/utils.ts
@@ -82,3 +82,14 @@ export function resolveFileWithPostfixes(
   }
   return null;
 }
+
+/**
+ * An identifier may become repeated when bundling multiple source files into a single bundle, so
+ * bundlers have a strategy of suffixing non-unique identifiers with a suffix like $2. This function
+ * strips off such suffixes, so that ngcc deals with the canonical name of an identifier.
+ * @param value The value to strip any suffix of, if applicable.
+ * @returns The canonical representation of the value, without any suffix.
+ */
+export function stripDollarSuffix(value: string): string {
+  return value.replace(/\$\d+$/, '');
+}
diff --git a/packages/compiler-cli/ngcc/test/helpers/utils.ts b/packages/compiler-cli/ngcc/test/helpers/utils.ts
index bfb679ce86..72ef2779c8 100644
--- a/packages/compiler-cli/ngcc/test/helpers/utils.ts
+++ b/packages/compiler-cli/ngcc/test/helpers/utils.ts
@@ -78,18 +78,18 @@ export function convertToDirectTsLibImport(filesystem: TestFile[]) {
   });
 }
 
-export function convertToInlineTsLib(filesystem: TestFile[]) {
+export function convertToInlineTsLib(filesystem: TestFile[], suffix: string = '') {
   return filesystem.map(file => {
     const contents = file.contents
                          .replace(`import * as tslib_1 from 'tslib';`, `
-var __decorate = null;
-var __metadata = null;
-var __read = null;
-var __values = null;
-var __param = null;
-var __extends = null;
-var __assign = null;
-`).replace(/tslib_1\./g, '');
+var __decorate${suffix} = null;
+var __metadata${suffix} = null;
+var __read${suffix} = null;
+var __values${suffix} = null;
+var __param${suffix} = null;
+var __extends${suffix} = null;
+var __assign${suffix} = null;
+`).replace(/tslib_1\.([_a-z]+)/gi, '$1' + suffix.replace('$', '$$'));
     return {...file, contents};
   });
 }
diff --git a/packages/compiler-cli/ngcc/test/host/esm2015_host_import_helper_spec.ts b/packages/compiler-cli/ngcc/test/host/esm2015_host_import_helper_spec.ts
index 2eb69d28e5..ab46d1b66c 100644
--- a/packages/compiler-cli/ngcc/test/host/esm2015_host_import_helper_spec.ts
+++ b/packages/compiler-cli/ngcc/test/host/esm2015_host_import_helper_spec.ts
@@ -112,15 +112,17 @@ runInEachFileSystem(() => {
 
       const DIRECT_IMPORT_FILES = convertToDirectTsLibImport(NAMESPACED_IMPORT_FILES);
       const INLINE_FILES = convertToInlineTsLib(NAMESPACED_IMPORT_FILES);
+      const INLINE_SUFFIXED_FILES = convertToInlineTsLib(NAMESPACED_IMPORT_FILES, '$2');
 
       FILES = {
         'namespaced': NAMESPACED_IMPORT_FILES,
         'direct import': DIRECT_IMPORT_FILES,
         'inline': INLINE_FILES,
+        'inline suffixed': INLINE_SUFFIXED_FILES,
       };
     });
 
-    ['namespaced', 'direct import', 'inline'].forEach(label => {
+    ['namespaced', 'direct import', 'inline', 'inline suffixed'].forEach(label => {
       describe(`[${label}]`, () => {
         beforeEach(() => {
           const fs = getFileSystem();
diff --git a/packages/compiler-cli/ngcc/test/host/esm5_host_import_helper_spec.ts b/packages/compiler-cli/ngcc/test/host/esm5_host_import_helper_spec.ts
index be6eb5a975..10a16f88c3 100644
--- a/packages/compiler-cli/ngcc/test/host/esm5_host_import_helper_spec.ts
+++ b/packages/compiler-cli/ngcc/test/host/esm5_host_import_helper_spec.ts
@@ -133,15 +133,17 @@ export { SomeDirective };
 
       const DIRECT_IMPORT_FILES = convertToDirectTsLibImport(NAMESPACED_IMPORT_FILES);
       const INLINE_FILES = convertToInlineTsLib(NAMESPACED_IMPORT_FILES);
+      const INLINE_SUFFIXED_FILES = convertToInlineTsLib(NAMESPACED_IMPORT_FILES, '$2');
 
       FILES = {
         'namespaced': NAMESPACED_IMPORT_FILES,
         'direct import': DIRECT_IMPORT_FILES,
         'inline': INLINE_FILES,
+        'inline suffixed': INLINE_SUFFIXED_FILES,
       };
     });
 
-    ['namespaced', 'direct import', 'inline'].forEach(label => {
+    ['namespaced', 'direct import', 'inline', 'inline suffixed'].forEach(label => {
       describe(`[${label}]`, () => {
         beforeEach(() => {
           const fs = getFileSystem();
diff --git a/packages/compiler-cli/ngcc/test/host/esm5_host_spec.ts b/packages/compiler-cli/ngcc/test/host/esm5_host_spec.ts
index 11ff1a063e..e475213324 100644
--- a/packages/compiler-cli/ngcc/test/host/esm5_host_spec.ts
+++ b/packages/compiler-cli/ngcc/test/host/esm5_host_spec.ts
@@ -1669,6 +1669,30 @@ runInEachFileSystem(() => {
         expect(definition.helper).toBe(TsHelperFn.Spread);
         expect(definition.parameters.length).toEqual(0);
       });
+
+      it('should recognize TypeScript __spread helper function implementation when suffixed',
+         () => {
+           const file: TestFile = {
+             name: _('/implementation.js'),
+             contents: `
+              var __spread$2 = (this && this.__spread$2) || function () {
+                for (var ar = [], i = 0; i < arguments.length; i++) ar = ar.concat(__read(arguments[i]));
+                return ar;
+              };`,
+           };
+           loadTestFiles([file]);
+           const {program} = makeTestBundleProgram(file.name);
+           const host = new Esm5ReflectionHost(new MockLogger(), false, program.getTypeChecker());
+
+           const node =
+               getDeclaration(program, file.name, '__spread$2', ts.isVariableDeclaration) !;
+
+           const definition = host.getDefinitionOfFunction(node) !;
+           expect(definition.node).toBe(node);
+           expect(definition.body).toBeNull();
+           expect(definition.helper).toBe(TsHelperFn.Spread);
+           expect(definition.parameters.length).toEqual(0);
+         });
     });
 
     describe('getImportOfIdentifier()', () => {