feat: add createTheme utility

Author: minheq

package.json

@@ -36,6 +36,7 @@
   "license": "MIT",
   "dependencies": {
     "@expo/vector-icons": "9.0.0",
+    "deepmerge": "^3.0.0",
     "exenv": "1.2.2",
     "focus-trap": "4.0.2",
     "react": "16.7.0",
@@ -44,7 +45,8 @@
     "react-icons": "3.3.0",
     "react-native-web": "0.9.13",
     "react-powerplug": "1.0.0",
-    "react-spring": "7.0.0"
+    "react-spring": "7.0.0",
+    "ts-essentials": "^1.0.2"
   },
   "devDependencies": {
     "@babel/core": "7.2.2",

src/components/Toast/Toast.tsx

@@ -1,8 +1,8 @@
 import * as React from 'react';
 import { Animated } from 'react-native';
+import { Omit } from 'ts-essentials';
 
 import { Theme, withTheme } from '../../theme';
-import { Omit } from '../../types/utils';
 import { Alert, AlertProps } from '../Alert';
 
 // Animation taken from https://medium.com/@norbajunior/react-native-facebook-and-instagram-like-top-bar-notifications-with-animated-api-43c48d0443dd

src/theme/createTheme.ts

@@ -0,0 +1,12 @@
+// @ts-ignore
+import deepMerge from 'deepmerge';
+import { DeepPartial } from 'ts-essentials';
+
+import { defaultTheme } from './default-theme';
+import { Theme } from './ThemeInterface';
+
+export const createTheme = (
+  theme: DeepPartial<Theme> = defaultTheme,
+): Theme => {
+  return deepMerge(defaultTheme, theme);
+};

src/theme/index.ts

@@ -2,3 +2,4 @@ export { defaultTheme } from './default-theme';
 export * from './ThemeContext';
 export * from './ThemeInterface';
 export { default as withTheme } from './withTheme';
+export { createTheme } from './createTheme';

src/types/utils.ts

@@ -12360,6 +12360,11 @@ tryer@^1.0.0:
   resolved "https://registry.yarnpkg.com/tryer/-/tryer-1.0.1.tgz#f2c85406800b9b0f74c9f7465b81eaad241252f8"
   integrity sha512-c3zayb8/kWWpycWYg87P71E1S1ZL6b6IJxfb5fvsUgsf0S2MVGaDhDXXjDMpdCpfWXqptc+4mXwmiy1ypXqRAA==
 
+ts-essentials@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-1.0.2.tgz#ae3e50824e06ea8fbe7e25179a41c3618f79b798"
+  integrity sha512-D9TbEdIS+809h3tEESsHwgRFz0FtaCUEXCadqyFW9dw1/eMWjMeGzBsfkestAPexfNxMky6Fu1acI25XrgpIrw==
+
 ts-jest@23.10.5:
   version "23.10.5"
   resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-23.10.5.tgz#cdb550df4466a30489bf70ba867615799f388dd5"