diff --git a/.npmignore b/.npmignore
index 3f808b1..93e0634 100644
--- a/.npmignore
+++ b/.npmignore
@@ -14,6 +14,7 @@ coverage
 !*.d.ts
 test
 
+.appveyor.yml
 jest.json
 .travis.yml
 tsconfig.json
diff --git a/jest.json b/jest.json
index 3420744..6d9c898 100644
--- a/jest.json
+++ b/jest.json
@@ -1,18 +1,18 @@
 {
-  "collectCoverage": true,
-  "transform": {
-      "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
-  },
-  "testMatch": [
-      "**/test/**/*.spec.ts"
-  ],
-  "testPathIgnorePatterns": [
-      "/node_modules/"
-  ],
-  "moduleFileExtensions": [
-      "ts",
-      "tsx",
-      "js",
-      "json"
-  ]
-}
+    "collectCoverage": true,
+    "transform": {
+        "^.+\\.tsx?$": "ts-jest"
+    },
+    "testMatch": [
+        "**/test/**/*.spec.ts"
+    ],
+    "testPathIgnorePatterns": [
+        "/node_modules/"
+    ],
+    "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js",
+        "json"
+    ]
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index ae0efd5..1222f94 100644
--- a/package.json
+++ b/package.json
@@ -36,12 +36,12 @@
   "homepage": "https://github.com/smartive/es-model#readme",
   "dependencies": {},
   "devDependencies": {
-    "@smartive/tslint-config": "^3.0.1",
-    "@types/jest": "^22.2.2",
+    "@smartive/tslint-config": "^4.0.0",
+    "@types/jest": "^23.0.0",
     "del-cli": "^1.1.0",
-    "jest": "^22.4.3",
+    "jest": "^24.8.0",
     "semantic-release": "^15.1.5",
-    "ts-jest": "^22.4.2",
+    "ts-jest": "^24.0.2",
     "tslint": "^5.9.1",
     "tslint-config-airbnb": "^5.8.0",
     "tsutils": "^2.26.0",
diff --git a/src/models/Mapping.ts b/src/models/Mapping.ts
index 1a533cf..c0ed3b5 100644
--- a/src/models/Mapping.ts
+++ b/src/models/Mapping.ts
@@ -1,16 +1,16 @@
-export type SimpleFieldType = 'text' | 'keyword' | 'date' | 'long' | 'double' | 'boolean' | 'ip';
+export type SimpleFieldType = 'text' | 'keyword' | 'date' | 'long' | 'integer' | 'double' | 'boolean' | 'ip';
 export type ObjectFieldType = 'object' | 'nested';
 export type SpecializedFieldType = 'geo_point' | 'geo_shape' | 'completion';
 
 export type Field = {
   type?: SimpleFieldType | SpecializedFieldType | Function;
-  search_analyzer?: 'suggestion_query_analyzer';
-  analyzer?: 'suggestion_analyzer' | 'default_analyzer';
+  search_analyzer?: string;
+  analyzer?: string;
   format?: 'date' | 'hour_minute';
 };
 
 export type Fields = {
-  [name: string]: Field,
+  [name: string]: Field;
 };
 
 export type MappingMeta = {
diff --git a/src/utils/decorators.ts b/src/utils/decorators.ts
index 9e700e2..df811c5 100644
--- a/src/utils/decorators.ts
+++ b/src/utils/decorators.ts
@@ -11,6 +11,6 @@ export function generatePropertyDecorator<T>(key: string): (data?: T) => Propert
       mapping = {};
       setMetadata(target, mapping, key);
     }
-    mapping[name] = data;
+    mapping[name.toString()] = data;
   };
 }
diff --git a/src/utils/template.ts b/src/utils/template.ts
index f9785df..e5a8b05 100644
--- a/src/utils/template.ts
+++ b/src/utils/template.ts
@@ -50,7 +50,7 @@ function buildMapping(type: Function): { name: string | undefined, mapping: EsIn
     mapping._source = meta._source;
     mapping.dynamic = meta.dynamic;
   }
-  
+
   const properties = getMetadata<Fields>(type, 'properties');
   if (properties) {
     mapping.properties = buildFields(properties, type);
@@ -94,12 +94,12 @@ function buildField(field: Field, name: string, type: Function): EsIndexTemplate
           res.type = 'object';
 
           const prototype = field.type.prototype;
-      
+
           const fieldTypeMeta = getMetadata<SubMappingMeta>(prototype);
           if (fieldTypeMeta) {
             res = { ...res, ...fieldTypeMeta };
           }
-      
+
           const properties = getMetadata<Fields>(prototype, 'properties');
           if (properties) {
             res.properties = buildFields(properties, prototype);
diff --git a/test/__snapshots__/decorators.spec.ts.snap b/test/__snapshots__/decorators.spec.ts.snap
index 61de69a..dbe2f3d 100644
--- a/test/__snapshots__/decorators.spec.ts.snap
+++ b/test/__snapshots__/decorators.spec.ts.snap
@@ -14,6 +14,9 @@ Object {
   "b": Object {
     "type": [Function],
   },
+  "c": Object {
+    "type": [Function],
+  },
   "keyword": undefined,
   "keywordArray": Object {
     "type": [Function],
diff --git a/test/__snapshots__/template.spec.ts.snap b/test/__snapshots__/template.spec.ts.snap
index b317c40..63b7f3a 100644
--- a/test/__snapshots__/template.spec.ts.snap
+++ b/test/__snapshots__/template.spec.ts.snap
@@ -9,6 +9,14 @@ Object {
     "dynamic": "strict",
     "properties": Object {
       "b": Object {
+        "properties": Object {
+          "aProperty": Object {
+            "type": "keyword",
+          },
+        },
+        "type": "object",
+      },
+      "c": Object {
         "properties": Object {
           "aProperty": Object {
             "type": "keyword",
diff --git a/test/decorators.spec.ts b/test/decorators.spec.ts
index faff842..496ba21 100644
--- a/test/decorators.spec.ts
+++ b/test/decorators.spec.ts
@@ -9,7 +9,6 @@ import { getMetadata } from '../src/utils/metadata';
 describe('decorators', () => {
   describe('EsObject ', () => {
     it('generates metadata', () => {
-
       @EsSubMapping()
       class Obj {
         @EsProperty()
@@ -43,12 +42,12 @@ describe('decorators', () => {
 
         @EsProperty({ type: 'text' })
         text: string;
-      
+
         @EsProperty({ type: Obj })
         b: Obj;
 
         @EsProperty({ type: Nested })
-        b: Nested;
+        c: Nested;
 
         @EsProperty({ type: WithFields })
         withFields: WithFields;
diff --git a/test/template.spec.ts b/test/template.spec.ts
index 86dadb6..0d8c062 100644
--- a/test/template.spec.ts
+++ b/test/template.spec.ts
@@ -9,7 +9,6 @@ import { buildMappings } from '../src/utils/template';
 describe('decorators', () => {
   describe('EsObject ', () => {
     it('generates metadata', () => {
-
       @EsSubMapping()
       class Obj {
         @EsProperty()
@@ -43,12 +42,12 @@ describe('decorators', () => {
 
         @EsProperty({ type: 'text' })
         text: string;
-      
+
         @EsProperty({ type: Obj })
         b: Obj;
 
         @EsProperty({ type: Nested })
-        b: Nested;
+        c: Nested;
 
         @EsProperty({ type: WithFields })
         withFields: WithFields;
diff --git a/tsconfig.json b/tsconfig.json
index c40f1e5..25054ce 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,9 @@
 {
-    "extends": "./config/tsconfig.base.json",
-    "compilerOptions": {
-        "watch": true,
-        "sourceMap": true
-    }
+  "extends": "./config/tsconfig.base.json",
+  "compilerOptions": {
+    "strictPropertyInitialization": false,
+    "experimentalDecorators": true,
+    "watch": true,
+    "sourceMap": true
+  }
 }