diff --git a/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.json b/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.json
index fbcea14bb9db..cc9fb168b02b 100644
--- a/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.json
+++ b/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.json
@@ -3,6 +3,7 @@
   "compilerOptions": {
     "target": "es2015",
     "declaration": true,
+    "declarationMap": true,
     "inlineSources": true,
     "types": [],
     "lib": [
@@ -10,6 +11,11 @@
       "es2018"
     ]
   },
+  "angularCompilerOptions": {
+    "skipTemplateCodegen": true,
+    "strictMetadataEmit": true,
+    "enableResourceInlining": true
+  },
   "exclude": [
     "src/test.ts",
     "**/*.spec.ts"
diff --git a/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.prod.json b/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.prod.json
index eb3a0142de75..04c0e66277e0 100644
--- a/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.prod.json
+++ b/packages/angular_devkit/build_ng_packagr/test/ng-packaged/projects/lib/tsconfig.lib.prod.json
@@ -1,9 +1,9 @@
 {
   "extends": "./tsconfig.lib.json",
+  "compilerOptions": {
+    "declarationMap": false
+  },
   "angularCompilerOptions": {
-    "skipTemplateCodegen": true,
-    "strictMetadataEmit": true,
-    "enableResourceInlining": true,
     "enableIvy": false
   }
 }
diff --git a/packages/schematics/angular/library/files/tsconfig.lib.json.template b/packages/schematics/angular/library/files/tsconfig.lib.json.template
index 8f7b94ed501a..bbd127f03731 100644
--- a/packages/schematics/angular/library/files/tsconfig.lib.json.template
+++ b/packages/schematics/angular/library/files/tsconfig.lib.json.template
@@ -4,6 +4,7 @@
     "outDir": "<%= relativePathToWorkspaceRoot %>/out-tsc/lib",
     "target": "es2015",
     "declaration": true,
+    "declarationMap": true,
     "inlineSources": true,
     "types": [],
     "lib": [
diff --git a/packages/schematics/angular/library/files/tsconfig.lib.prod.json.template b/packages/schematics/angular/library/files/tsconfig.lib.prod.json.template
index cbae79422480..04c0e66277e0 100644
--- a/packages/schematics/angular/library/files/tsconfig.lib.prod.json.template
+++ b/packages/schematics/angular/library/files/tsconfig.lib.prod.json.template
@@ -1,5 +1,8 @@
 {
   "extends": "./tsconfig.lib.json",
+  "compilerOptions": {
+    "declarationMap": false
+  },
   "angularCompilerOptions": {
     "enableIvy": false
   }