diff --git a/.babelrc b/.babelrc
index 4f117e8..31effbd 100644
--- a/.babelrc
+++ b/.babelrc
@@ -29,6 +29,7 @@
       "rename": "./config/babel/getComponentName.babel.js"
     }],
     "@babel/plugin-transform-runtime",
+    "babel-plugin-flow-runtime",
     ["module-resolver", {"alias": {"": "./src"}}]
   ]
 }
diff --git a/.flowconfig b/.flowconfig
index a958eb5..e19645e 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -8,3 +8,4 @@
 emoji=true
 module.name_mapper='^/\(.*\)$' -> '<PROJECT_ROOT>/src/\1'
 module.name_mapper.extension='css' -> '<PROJECT_ROOT>/flow-stub/CSSModule.js'
+suppress_comment=\\(.\\|\n\\)*\\$ExpectError
diff --git a/.nvmrc b/.nvmrc
index ec63514..8148c55 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-9
+9.4.0
diff --git a/flow-typed/type-defs.js b/flow-typed/type-defs.js
index fc99f18..ae60b98 100644
--- a/flow-typed/type-defs.js
+++ b/flow-typed/type-defs.js
@@ -10,6 +10,13 @@ declare module 'react-dom' {
   ): React$ElementRef<ElementType>;
 }
 
+declare module 'flow-runtime' {
+  declare type Type<T> = {
+    assert: (input: any) => T,
+  };
+  declare var reify: any;
+}
+
 /*
 note: this also needs to be added for ramda:
 declare function chain<U, T> (
diff --git a/package-lock.json b/package-lock.json
index a449ed6..e8ef064 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1372,6 +1372,31 @@
         "babel-runtime": "6.26.0"
       }
     },
+    "babel-plugin-flow-runtime": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-flow-runtime/-/babel-plugin-flow-runtime-0.15.0.tgz",
+      "integrity": "sha512-/7Nl5Ld+pDzRsY62pbob1J6+bHebLgYWXLxapJxrHEx3c6NIUn8fOtsoTcAV4omGpHRykyi31rIxgCyBCIhAng==",
+      "requires": {
+        "babel-generator": "6.26.0",
+        "babel-traverse": "6.26.0",
+        "babel-types": "6.26.0",
+        "babylon": "6.18.0",
+        "camelcase": "3.0.0",
+        "flow-config-parser": "0.3.0"
+      },
+      "dependencies": {
+        "babylon": {
+          "version": "6.18.0",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+          "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ=="
+        },
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
+        }
+      }
+    },
     "babel-plugin-module-resolver": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-module-resolver/-/babel-plugin-module-resolver-3.0.0.tgz",
@@ -4820,11 +4845,21 @@
       "integrity": "sha512-aWKHYs3UECgpwrIDVUiABjSC8dgaKmonymQDWO+6FhGcp9lnnxdDBE6Sfm3F7YaRPfLYsWAY4lndBrfrfyn+9g==",
       "dev": true
     },
+    "flow-config-parser": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/flow-config-parser/-/flow-config-parser-0.3.0.tgz",
+      "integrity": "sha1-cEkW77qIzSUYq02PkzB5VxJ2E48="
+    },
     "flow-parser": {
       "version": "0.63.1",
       "resolved": "https://registry.npmjs.org/flow-parser/-/flow-parser-0.63.1.tgz",
       "integrity": "sha1-hP1ke1ijcML8BGKADiLtd8PN8kk="
     },
+    "flow-runtime": {
+      "version": "0.16.0",
+      "resolved": "https://registry.npmjs.org/flow-runtime/-/flow-runtime-0.16.0.tgz",
+      "integrity": "sha512-qkXktzx0fksnXsJbamz4PK5NaIrEax1HoKlSAVzN7VOVIM23293zdSFE3V40aSalvk+jKrYQHNA6FWLp5ACVog=="
+    },
     "flush-write-stream": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/flush-write-stream/-/flush-write-stream-1.0.2.tgz",
@@ -6226,6 +6261,11 @@
       "integrity": "sha512-YGG3ejvBNHRqu0559EOxxNFihD0AjpvHlC/pdGKd3X3ofe+CoJkYazwNJYTNebqpPKN+VVQbh4ZFn1DivMNuHA==",
       "dev": true
     },
+    "immutable": {
+      "version": "3.8.2",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-3.8.2.tgz",
+      "integrity": "sha1-wkOZUUVbs5kT2vKBN28VMOEErfM="
+    },
     "import-file": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/import-file/-/import-file-1.2.2.tgz",
diff --git a/package.json b/package.json
index 09ed1d7..f06363b 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "@babel/runtime": "^7.0.0-beta.38",
     "autoprefixer": "^7.2.5",
     "babel-loader": "^8.0.0-beta.0",
+    "babel-plugin-flow-runtime": "^0.15.0",
     "babel-plugin-module-resolver": "^3.0.0",
     "babel-plugin-react-rename": "^0.1.0",
     "clean-webpack-plugin": "^0.1.17",
@@ -33,7 +34,9 @@
     "css-loader": "^0.28.9",
     "extract-css-chunks-webpack-plugin": "^2.0.18",
     "find-nearest-file": "^1.1.0",
+    "flow-runtime": "^0.16.0",
     "htmlescape": "^1.1.1",
+    "immutable": "^3.8.2",
     "midori": "^1.0.0",
     "pages-webpack-plugin": "^0.1.0",
     "postcss-loader": "^2.0.10",
diff --git a/test/flow/reify.js b/test/flow/reify.js
new file mode 100644
index 0000000..35713ea
--- /dev/null
+++ b/test/flow/reify.js
@@ -0,0 +1,15 @@
+/* @flow */
+
+import {reify} from 'flow-runtime';
+import type {Type} from 'flow-runtime';
+
+type User = {
+  username: string,
+  age: number,
+};
+
+const json = {foo: 5};
+const user = (reify: Type<User>).assert(json);
+
+// $ExpectError
+user.x;