diff --git a/modules/@angular/common/tsconfig-testing.json b/modules/@angular/common/tsconfig-testing.json
index 67dbcf0eaa..53755ba011 100644
--- a/modules/@angular/common/tsconfig-testing.json
+++ b/modules/@angular/common/tsconfig-testing.json
@@ -1,22 +1,12 @@
 {
+  "extends": "./tsconfig-build",
+
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/common/",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core/"],
       "@angular/common": ["../../../dist/packages-dist/common"]
     },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    "target": "es5"
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/compiler-cli/tsconfig-2015.json b/modules/@angular/compiler-cli/tsconfig-2015.json
index eb0fc3b16c..93dc59d24a 100644
--- a/modules/@angular/compiler-cli/tsconfig-2015.json
+++ b/modules/@angular/compiler-cli/tsconfig-2015.json
@@ -1,34 +1,8 @@
 {
+    "extends": "./tsconfig-build",
     "compilerOptions": {
-        "baseUrl": ".",
-        "declaration": true,
-        "experimentalDecorators": true,
-        "noImplicitAny": true,
         "module": "es2015",
         "moduleResolution": "node",
-        "outDir": "../../../dist/esm/compiler-cli",
-        "paths": {
-          "@angular/core": ["../../../dist/packages-dist/core"],
-          "@angular/common": ["../../../dist/packages-dist/common"],
-          "@angular/compiler": ["../../../dist/packages-dist/compiler"],
-          "@angular/platform-server": ["../../../dist/packages-dist/platform-server"],
-          "@angular/platform-browser": ["../../../dist/packages-dist/platform-browser"],
-          "@angular/tsc-wrapped": ["../../../dist/tools/@angular/tsc-wrapped"]
-        },
-        "rootDir": ".",
-        "sourceMap": true,
-        "inlineSources": true,
-        "target": "es5",
-        "lib": ["es6", "dom"],
-        "skipLibCheck": true
-    },
-    "exclude": ["integrationtest"],
-    "files": [
-        "index.ts",
-        "src/main.ts",
-        "src/extract_i18n.ts",
-        "../../../node_modules/@types/node/index.d.ts",
-        "../../../node_modules/@types/jasmine/index.d.ts",
-        "../../../node_modules/zone.js/dist/zone.js.d.ts"
-    ]
+        "outDir": "../../../dist/esm/compiler-cli"
+    }
 }
diff --git a/modules/@angular/compiler/tsconfig-testing.json b/modules/@angular/compiler/tsconfig-testing.json
index 5ccab8de0d..cd278208ac 100644
--- a/modules/@angular/compiler/tsconfig-testing.json
+++ b/modules/@angular/compiler/tsconfig-testing.json
@@ -1,23 +1,14 @@
 {
+  "extends": "./tsconfig-build",
+
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/compiler/",
+    // Test that we rely on decorator downleveling
+    "emitDecoratorMetadata": false,
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/core/testing": ["../../../dist/packages-dist/core/testing"],
       "@angular/compiler": ["../../../dist/packages-dist/compiler"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/core/tsconfig-testing.json b/modules/@angular/core/tsconfig-testing.json
index 3d7613bacd..adde454a0f 100644
--- a/modules/@angular/core/tsconfig-testing.json
+++ b/modules/@angular/core/tsconfig-testing.json
@@ -1,22 +1,11 @@
 {
+  "extends": "./tsconfig-build",
+
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/core",
     "paths": {
       "rxjs/*": ["../../../node_modules/rxjs/*"],
       "@angular/core": ["../../../dist/packages-dist/core"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/http/tsconfig-testing.json b/modules/@angular/http/tsconfig-testing.json
index 3abad28775..7f7bd0eac5 100644
--- a/modules/@angular/http/tsconfig-testing.json
+++ b/modules/@angular/http/tsconfig-testing.json
@@ -1,23 +1,11 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/http",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/http": ["../../../dist/packages-dist/http"],
       "rxjs/*": ["../../../node_modules/rxjs/*"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts"
diff --git a/modules/@angular/platform-browser-dynamic/tsconfig-testing.json b/modules/@angular/platform-browser-dynamic/tsconfig-testing.json
index 776e5dbc34..2355e245c5 100644
--- a/modules/@angular/platform-browser-dynamic/tsconfig-testing.json
+++ b/modules/@angular/platform-browser-dynamic/tsconfig-testing.json
@@ -1,12 +1,6 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/platform-browser-dynamic/",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/core/testing": ["../../../dist/packages-dist/core/testing"],
@@ -17,13 +11,7 @@
       "@angular/platform-browser": ["../../../dist/packages-dist/platform-browser"],
       "@angular/platform-browser/testing": ["../../../dist/packages-dist/platform-browser/testing"],
       "@angular/platform-browser-dynamic": ["../../../dist/packages-dist/platform-browser-dynamic"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es2015", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/platform-browser/tsconfig-testing.json b/modules/@angular/platform-browser/tsconfig-testing.json
index e99984c709..c14de7e836 100644
--- a/modules/@angular/platform-browser/tsconfig-testing.json
+++ b/modules/@angular/platform-browser/tsconfig-testing.json
@@ -1,25 +1,13 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/platform-browser/",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/core/testing": ["../../../dist/packages-dist/core/testing"],
       "@angular/common": ["../../../dist/packages-dist/common"],
       "@angular/common/testing": ["../../../dist/packages-dist/common/testing"],
       "@angular/platform-browser": ["../../../dist/packages-dist/platform-browser"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/platform-server/tsconfig-testing.json b/modules/@angular/platform-server/tsconfig-testing.json
index 548ccce429..1fec1894bc 100644
--- a/modules/@angular/platform-server/tsconfig-testing.json
+++ b/modules/@angular/platform-server/tsconfig-testing.json
@@ -1,12 +1,6 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "outDir": "../../../dist/packages-dist/platform-server/",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core/"],
       "@angular/core/testing": ["../../../dist/packages-dist/core/testing"],
@@ -19,13 +13,7 @@
       "@angular/platform-browser-dynamic": ["../../../dist/packages-dist/platform-browser-dynamic"],
       "@angular/platform-browser-dynamic/testing": ["../../../dist/packages-dist/platform-browser-dynamic/testing"],
       "@angular/platform-server": ["../../../dist/packages-dist/platform-server"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts",
diff --git a/modules/@angular/router/tsconfig-testing.json b/modules/@angular/router/tsconfig-testing.json
index 242fa3e099..f6a106efe7 100644
--- a/modules/@angular/router/tsconfig-testing.json
+++ b/modules/@angular/router/tsconfig-testing.json
@@ -1,29 +1,13 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "emitDecoratorMetadata": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "noEmitOnError": false,
-    "noImplicitAny": true,
-    "noImplicitReturns": true,
-    "outDir": "../../../dist/packages-dist/router/",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/common": ["../../../dist/packages-dist/common"],
       "@angular/common/testing": ["../../../dist/packages-dist/common/testing"],
       "@angular/platform-browser": ["../../../dist/packages-dist/platform-browser"],
       "@angular/router": ["../../../dist/packages-dist/router"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es6", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "testing/index.ts"
diff --git a/modules/@angular/router/tsconfig-upgrade.json b/modules/@angular/router/tsconfig-upgrade.json
index afa6c8a97b..80194268e9 100644
--- a/modules/@angular/router/tsconfig-upgrade.json
+++ b/modules/@angular/router/tsconfig-upgrade.json
@@ -1,28 +1,12 @@
 {
+  "extends": "./tsconfig-build",
   "compilerOptions": {
-    "baseUrl": ".",
-    "declaration": true,
-    "stripInternal": true,
-    "emitDecoratorMetadata": true,
-    "experimentalDecorators": true,
-    "module": "es2015",
-    "moduleResolution": "node",
-    "noEmitOnError": false,
-    "noImplicitAny": true,
-    "noImplicitReturns": true,
-    "outDir": "../../../dist/packages-dist/router",
     "paths": {
       "@angular/core": ["../../../dist/packages-dist/core"],
       "@angular/platform-browser": ["../../../dist/packages-dist/platform-browser"],
       "@angular/router": ["../../../dist/packages-dist/router"],
       "@angular/upgrade/static": ["../../../dist/packages-dist/upgrade/static"]
-    },
-    "rootDir": ".",
-    "sourceMap": true,
-    "inlineSources": true,
-    "lib": ["es2015", "dom"],
-    "target": "es5",
-    "skipLibCheck": true
+    }
   },
   "files": [
     "upgrade.ts"