diff --git a/integration/samples/typings/src/chalk.d.ts b/integration/samples/typings/src/chalk.ts
similarity index 100%
rename from integration/samples/typings/src/chalk.d.ts
rename to integration/samples/typings/src/chalk.ts
diff --git a/integration/samples/typings/src/nested/reference/index.ts b/integration/samples/typings/src/nested/reference/index.ts
index 9bd910d4c..998f7bc30 100644
--- a/integration/samples/typings/src/nested/reference/index.ts
+++ b/integration/samples/typings/src/nested/reference/index.ts
@@ -1,3 +1,3 @@
-/// <reference path="./mocked.d.ts" />
+/// <reference path="./mocked.ts" />
 
 export const faz: Mocked = { foo: 'bar' };
diff --git a/integration/samples/typings/src/nested/reference/mocked.d.ts b/integration/samples/typings/src/nested/reference/mocked.ts
similarity index 100%
rename from integration/samples/typings/src/nested/reference/mocked.d.ts
rename to integration/samples/typings/src/nested/reference/mocked.ts
diff --git a/integration/samples/typings/src/validator.ts b/integration/samples/typings/src/validator.ts
index 18526c31f..eb612c3bc 100644
--- a/integration/samples/typings/src/validator.ts
+++ b/integration/samples/typings/src/validator.ts
@@ -1,4 +1,4 @@
-/// <reference path="./chalk.d.ts" />
+/// <reference path="./chalk.ts" />
 import * as chalk from 'chalk';
 
 export { chalk };
diff --git a/src/lib/ng-package/entry-point/compile-ngc.transform.ts b/src/lib/ng-package/entry-point/compile-ngc.transform.ts
index d594a8d69..f6564a7a1 100644
--- a/src/lib/ng-package/entry-point/compile-ngc.transform.ts
+++ b/src/lib/ng-package/entry-point/compile-ngc.transform.ts
@@ -8,7 +8,7 @@ import * as log from '../../utils/log';
 import { isEntryPointInProgress, EntryPointNode, isEntryPoint } from '../nodes';
 import { StylesheetProcessor } from '../../styles/stylesheet-processor';
 
-export const compileNgcTransform: Transform = transformFromPromise(async (graph) => {
+export const compileNgcTransform: Transform = transformFromPromise(async graph => {
   log.info(`Compiling TypeScript sources through ngc`);
   const entryPoint = graph.find(isEntryPointInProgress()) as EntryPointNode;
   const entryPoints = graph.filter(isEntryPoint) as EntryPointNode[];
@@ -30,10 +30,10 @@ export const compileNgcTransform: Transform = transformFromPromise(async (graph)
     stylesheetProcessor,
     {
       outDir: path.dirname(esm2015),
+      declarationDir: path.dirname(declarations),
       declaration: true,
       target: ts.ScriptTarget.ES2015,
     },
-    path.dirname(declarations),
     ngccProcessor,
   );
 
diff --git a/src/lib/ngc/compile-source-files.ts b/src/lib/ngc/compile-source-files.ts
index 68efb3568..f82356c5f 100644
--- a/src/lib/ngc/compile-source-files.ts
+++ b/src/lib/ngc/compile-source-files.ts
@@ -1,7 +1,6 @@
 import * as ng from '@angular/compiler-cli';
 import * as ts from 'typescript';
 import * as log from '../utils/log';
-import { redirectWriteFileCompilerHost } from '../ts/redirect-write-file-compiler-host';
 import { cacheCompilerHost } from '../ts/cache-compiler-host';
 import { StylesheetProcessor } from '../styles/stylesheet-processor';
 import { BuildGraph } from '../graph/build-graph';
@@ -16,7 +15,6 @@ export async function compileSourceFiles(
   moduleResolutionCache: ts.ModuleResolutionCache,
   stylesheetProcessor: StylesheetProcessor,
   extraOptions?: Partial<ng.CompilerOptions>,
-  declarationDir?: string,
   ngccProcessor?: NgccProcessor,
 ) {
   log.debug(`ngc (v${ng.VERSION.full})`);
@@ -31,9 +29,6 @@ export async function compileSourceFiles(
     moduleResolutionCache,
     stylesheetProcessor,
   );
-  if (declarationDir) {
-    tsCompilerHost = redirectWriteFileCompilerHost(tsCompilerHost, tsConfigOptions.basePath, declarationDir);
-  }
 
   if (tsConfigOptions.enableIvy && ngccProcessor) {
     tsCompilerHost = ngccTransformCompilerHost(tsCompilerHost, tsConfigOptions, ngccProcessor, moduleResolutionCache);
diff --git a/src/lib/ts/redirect-write-file-compiler-host.ts b/src/lib/ts/redirect-write-file-compiler-host.ts
deleted file mode 100644
index 5c56ed23d..000000000
--- a/src/lib/ts/redirect-write-file-compiler-host.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import * as ts from 'typescript';
-import * as path from 'path';
-
-/**
- * Returns a TypeScript compiler host that redirects `writeFile` output to the given `declarationDir`.
- *
- * @param compilerHost Original compiler host
- * @param baseDir Project base directory
- * @param declarationDir Declarations target directory
- */
-export function redirectWriteFileCompilerHost(
-  compilerHost: ts.CompilerHost,
-  baseDir: string,
-  declarationDir: string,
-): ts.CompilerHost {
-  return {
-    ...compilerHost,
-    writeFile: (
-      fileName: string,
-      data: string,
-      writeByteOrderMark: boolean,
-      onError?: (message: string) => void,
-      sourceFiles?: ReadonlyArray<ts.SourceFile>,
-    ) => {
-      let filePath = fileName;
-      if (/(\.d\.ts|\.metadata\.json)$/.test(fileName)) {
-        const projectRelativePath = path.relative(baseDir, fileName);
-        filePath = path.resolve(declarationDir, projectRelativePath);
-      }
-      compilerHost.writeFile.call(this, filePath, data, writeByteOrderMark, onError, sourceFiles);
-    },
-  };
-}
diff --git a/src/lib/ts/tsconfig.ts b/src/lib/ts/tsconfig.ts
index 39440496a..2379b5fa2 100644
--- a/src/lib/ts/tsconfig.ts
+++ b/src/lib/ts/tsconfig.ts
@@ -87,7 +87,6 @@ export const initializeTsConfig = (defaultTsConfig: ng.ParsedConfiguration, entr
       flatModuleOutFile: `${entryPoint.flatModuleFile}.js`,
       basePath,
       rootDir: basePath,
-      declarationDir: basePath,
     };
 
     tsConfig.rootNames = [entryPoint.entryFilePath];