diff --git a/.gitattributes b/.gitattributes
index ea92ae4a..159b7455 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,7 @@
 *.js text eol=lf
 *.jsx text eol=lf
+*.ts text eol=lf
+*.tsx text eol=lf
 *.json text eol=lf
 *.css text eol=lf
 *.html text eol=lf
diff --git a/eslintrc.ts.base.json b/eslintrc.ts.base.json
index ba7fe944..88ce4c96 100644
--- a/eslintrc.ts.base.json
+++ b/eslintrc.ts.base.json
@@ -8,5 +8,11 @@
     "plugin:@typescript-eslint/recommended-requiring-type-checking",
     "plugin:prettier/recommended",
     "prettier/@typescript-eslint"
-  ]
+  ],
+  "rules": {
+    "@typescript-eslint/no-unsafe-return": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off"
+  }
 }
diff --git a/eslintrc.ts.jest.base.json b/eslintrc.ts.jest.base.json
index 09258ad7..39d1899e 100644
--- a/eslintrc.ts.jest.base.json
+++ b/eslintrc.ts.jest.base.json
@@ -9,5 +9,11 @@
     "plugin:jest/style",
     "plugin:prettier/recommended",
     "prettier/@typescript-eslint"
-  ]
+  ],
+  "rules": {
+    "@typescript-eslint/no-unsafe-return": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off"
+  }
 }
diff --git a/eslintrc.ts.react.base.json b/eslintrc.ts.react.base.json
index 4a14249d..3444c0ad 100644
--- a/eslintrc.ts.react.base.json
+++ b/eslintrc.ts.react.base.json
@@ -20,5 +20,11 @@
     "react": {
       "version": "detect"
     }
+  },
+  "rules": {
+    "@typescript-eslint/no-unsafe-return": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off"
   }
 }
diff --git a/eslintrc.ts.react.jest.base.json b/eslintrc.ts.react.jest.base.json
index 9627f74f..f7d46f95 100644
--- a/eslintrc.ts.react.jest.base.json
+++ b/eslintrc.ts.react.jest.base.json
@@ -11,5 +11,11 @@
     "plugin:prettier/recommended",
     "prettier/@typescript-eslint",
     "prettier/react"
-  ]
+  ],
+  "rules": {
+    "@typescript-eslint/no-unsafe-return": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off"
+  }
 }
diff --git a/packages/react-base16-styling/src/index.ts b/packages/react-base16-styling/src/index.ts
index 8542d58d..6f3c36db 100644
--- a/packages/react-base16-styling/src/index.ts
+++ b/packages/react-base16-styling/src/index.ts
@@ -266,7 +266,7 @@ export const getBase16Theme = (
     : undefined;
 };
 
-export const invertTheme = (theme: Theme): Theme => {
+export const invertTheme = (theme: Theme | undefined): Theme | undefined => {
   if (typeof theme === 'string') {
     return `${theme}:inverted`;
   }
diff --git a/packages/react-json-tree/package.json b/packages/react-json-tree/package.json
index ce606f4e..000b1979 100644
--- a/packages/react-json-tree/package.json
+++ b/packages/react-json-tree/package.json
@@ -31,7 +31,7 @@
   },
   "scripts": {
     "start": "cd examples && npm start",
-    "build": "npm run build:types && npm run build:js && npm build:umd && npm build:umd:min",
+    "build": "npm run build:types && npm run build:js && npm run build:umd && npm run build:umd:min",
     "build:types": "tsc --emitDeclarationOnly",
     "build:js": "babel src --out-dir lib --extensions \".ts,.tsx\" --source-maps inline",
     "build:umd": "rimraf ./umd && webpack --progress --config webpack.config.umd.js",
@@ -50,7 +50,6 @@
     "react-base16-styling": "^0.7.0"
   },
   "peerDependencies": {
-    "react": "^16.3.0",
-    "react-dom": "^16.3.0"
+    "react": "^16.3.0"
   }
 }
diff --git a/packages/react-json-tree/src/JSONArrayNode.tsx b/packages/react-json-tree/src/JSONArrayNode.tsx
index 71fb7f2a..97440160 100644
--- a/packages/react-json-tree/src/JSONArrayNode.tsx
+++ b/packages/react-json-tree/src/JSONArrayNode.tsx
@@ -6,7 +6,9 @@ import { CircularPropsPassedThroughJSONNode } from './types';
 // Returns the "n Items" string for this node,
 // generating and caching it if it hasn't been created yet.
 function createItemString(data: any) {
-  return `${data.length} ${data.length !== 1 ? 'items' : 'item'}`;
+  return `${(data as unknown[]).length} ${
+    (data as unknown[]).length !== 1 ? 'items' : 'item'
+  }`;
 }
 
 interface Props extends CircularPropsPassedThroughJSONNode {
diff --git a/packages/react-json-tree/src/JSONNode.tsx b/packages/react-json-tree/src/JSONNode.tsx
index bedeeee3..a95314c0 100644
--- a/packages/react-json-tree/src/JSONNode.tsx
+++ b/packages/react-json-tree/src/JSONNode.tsx
@@ -57,7 +57,10 @@ const JSONNode: React.FunctionComponent<Props> = ({
       return <JSONIterableNode {...nestedNodeProps} />;
     case 'String':
       return (
-        <JSONValueNode {...simpleNodeProps} valueGetter={(raw) => `"${raw}"`} />
+        <JSONValueNode
+          {...simpleNodeProps}
+          valueGetter={(raw: string) => `"${raw}"`}
+        />
       );
     case 'Number':
       return <JSONValueNode {...simpleNodeProps} />;
diff --git a/packages/react-json-tree/src/getCollectionEntries.ts b/packages/react-json-tree/src/getCollectionEntries.ts
index 4db49ab0..efca5f7f 100644
--- a/packages/react-json-tree/src/getCollectionEntries.ts
+++ b/packages/react-json-tree/src/getCollectionEntries.ts
@@ -18,7 +18,7 @@ function getEntries(
   sortObjectKeys?: ((a: any, b: any) => number) | boolean | undefined,
   from = 0,
   to = Infinity
-) {
+): { entries: { key: string | number; value: any }[]; hasMore?: boolean } {
   let res;
 
   if (type === 'Object') {
@@ -37,7 +37,7 @@ function getEntries(
     res = {
       entries: collection
         .slice(from, to + 1)
-        .map((val, idx) => ({ key: idx + from, value: val })),
+        .map((val: unknown, idx: number) => ({ key: idx + from, value: val })),
     };
   } else {
     let idx = 0;
diff --git a/packages/react-json-tree/test/index.spec.js b/packages/react-json-tree/test/index.spec.tsx
similarity index 100%
rename from packages/react-json-tree/test/index.spec.js
rename to packages/react-json-tree/test/index.spec.tsx
diff --git a/packages/react-json-tree/test/objType.spec.js b/packages/react-json-tree/test/objType.spec.ts
similarity index 100%
rename from packages/react-json-tree/test/objType.spec.js
rename to packages/react-json-tree/test/objType.spec.ts
diff --git a/packages/react-json-tree/webpack.config.umd.js b/packages/react-json-tree/webpack.config.umd.js
index bac240a9..2bb954d6 100644
--- a/packages/react-json-tree/webpack.config.umd.js
+++ b/packages/react-json-tree/webpack.config.umd.js
@@ -3,7 +3,7 @@ const path = require('path');
 module.exports = (env = {}) => ({
   mode: env.production ? 'production' : 'development',
   entry: {
-    app: ['./src/index.js'],
+    app: ['./src/index'],
   },
   output: {
     library: 'ReactJsonTree',
@@ -15,12 +15,15 @@ module.exports = (env = {}) => ({
   module: {
     rules: [
       {
-        test: /\.js$/,
+        test: /\.(js|ts)x?$/,
         loader: 'babel-loader',
         exclude: /node_modules/,
       },
     ],
   },
+  resolve: {
+    extensions: ['.js', '.jsx', '.ts', '.tsx'],
+  },
   externals: {
     react: {
       root: 'React',
@@ -28,11 +31,5 @@ module.exports = (env = {}) => ({
       commonjs: 'react',
       amd: 'react',
     },
-    'react-dom': {
-      root: 'ReactDOM',
-      commonjs2: 'react-dom',
-      commonjs: 'react-dom',
-      amd: 'react-dom',
-    },
   },
 });