diff --git a/superset-frontend/temporary_superset_ui/superset-ui/.travis.yml b/superset-frontend/temporary_superset_ui/superset-ui/.travis.yml
index 879ae9cc21b85..f410e3d418572 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/.travis.yml
+++ b/superset-frontend/temporary_superset_ui/superset-ui/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 
 node_js:
-  - 10.7
+  - '10.10'
 
 cache:
   - npm: true
@@ -15,7 +15,7 @@ install:
   - yarn install
 
 before_script:
-  - yarn run build
+  - yarn build
 
 script:
   - yarn test
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/package.json b/superset-frontend/temporary_superset_ui/superset-ui/package.json
index ee3d00254efd7..18d93c97ce43c 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/package.json
+++ b/superset-frontend/temporary_superset_ui/superset-ui/package.json
@@ -8,8 +8,8 @@
     "build": "yarn run build:cjs && yarn run build:esm && yarn run type:dts",
     "build:cjs": "NODE_ENV=production beemo babel --extensions=\".js,.jsx,.ts,.tsx\" ./src --out-dir lib/ --minify --workspaces=\"@superset-ui/!(demo|generator-superset)\"",
     "build:esm": "NODE_ENV=production beemo babel --extensions=\".js,.jsx,.ts,.tsx\" ./src --out-dir esm/ --esm --minify --workspaces=\"@superset-ui/!(demo|generator-superset)\"",
-    "type": "NODE_ENV=production beemo typescript --workspaces=\"@superset-ui/(connection|core|color|chart|number-format)\" --noEmit",
-    "type:dts": "NODE_ENV=production beemo typescript --workspaces=\"@superset-ui/(connection|core|color|chart|number-format)\" --emitDeclarationOnly",
+    "type": "NODE_ENV=production beemo typescript --workspaces=\"@superset-ui/(connection|core|color|chart|number-format|translation)\" --noEmit",
+    "type:dts": "NODE_ENV=production beemo typescript --workspaces=\"@superset-ui/(connection|core|color|chart|number-format|translation)\" --emitDeclarationOnly",
     "lint": "beemo create-config prettier && beemo eslint \"./packages/*/{src,test,storybook}/**/*.{js,jsx,ts,tsx}\"",
     "lint:fix": "beemo create-config prettier && beemo eslint --fix \"./packages/*/{src,test,storybook}/**/*.{js,jsx,ts,tsx}\"",
     "jest": "beemo jest --color --coverage --react",
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.ts
similarity index 52%
rename from superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.js
rename to superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.ts
index b0944f4a8cdb4..9bc495f3608bd 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.js
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/Translator.ts
@@ -1,4 +1,4 @@
-import Jed from 'jed';
+import Jed, { LanguagePack } from 'jed';
 
 const DEFAULT_LANGUAGE_PACK = {
   domain: 'superset',
@@ -13,27 +13,25 @@ const DEFAULT_LANGUAGE_PACK = {
   },
 };
 
+export { LanguagePack };
+
+export interface TranslatorConfig {
+  languagePack?: LanguagePack;
+}
+
 export default class Translator {
-  constructor({ languagePack = DEFAULT_LANGUAGE_PACK } = {}) {
+  i18n: Jed;
+
+  constructor(config: TranslatorConfig = {}) {
+    const { languagePack = DEFAULT_LANGUAGE_PACK } = config;
     this.i18n = new Jed(languagePack);
   }
 
-  translate(input, ...args) {
-    if (input === null || input === undefined) {
-      return input;
-    }
-
+  translate(input: string, ...args: any[]): string {
     return this.i18n.translate(input).fetch(...args);
   }
 
-  translateWithNumber(singular, plural, num = 0, ...args) {
-    if (singular === null || singular === undefined) {
-      return singular;
-    }
-    if (plural === null || plural === undefined) {
-      return plural;
-    }
-
+  translateWithNumber(singular: string, plural: string, num: number = 0, ...args: any[]): string {
     return this.i18n
       .translate(singular)
       .ifPlural(num, plural)
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.ts
similarity index 51%
rename from superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.js
rename to superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.ts
index 90f8e11991bd9..da855d592c80e 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.js
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/TranslatorSingleton.ts
@@ -1,10 +1,10 @@
 /* eslint no-console: 0 */
-import Translator from './Translator';
+import Translator, { TranslatorConfig } from './Translator';
 
-let singleton;
+let singleton: Translator;
 let isConfigured = false;
 
-function configure(config) {
+function configure(config?: TranslatorConfig) {
   singleton = new Translator(config);
   isConfigured = true;
 
@@ -22,12 +22,12 @@ function getInstance() {
   return singleton;
 }
 
-function t(...args) {
-  return getInstance().translate(...args);
+function t(input: string, ...args: any[]) {
+  return getInstance().translate(input, ...args);
 }
 
-function tn(...args) {
-  return getInstance().translateWithNumber(...args);
+function tn(singular: string, plural: string, ...args: any[]) {
+  return getInstance().translateWithNumber(singular, plural, ...args);
 }
 
 export { configure, t, tn };
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.js
deleted file mode 100644
index 5ed37f1bbd1b6..0000000000000
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.js
+++ /dev/null
@@ -1 +0,0 @@
-export { configure, t, tn } from './TranslatorSingleton';
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.ts b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.ts
new file mode 100644
index 0000000000000..492599e2da6fa
--- /dev/null
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/src/index.ts
@@ -0,0 +1,2 @@
+export { configure, t, tn } from './TranslatorSingleton';
+export { TranslatorConfig, LanguagePack } from './Translator';
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.ts
similarity index 70%
rename from superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.js
rename to superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.ts
index 906fabe50239c..2a5be0975d57f 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.js
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/Translator.test.ts
@@ -1,5 +1,5 @@
 import Translator from '../src/Translator';
-import languagePackZh from './languagePacks/zh.json';
+import languagePackZh from './languagePacks/zh';
 
 describe('Translator', () => {
   it('exists', () => {
@@ -24,12 +24,6 @@ describe('Translator', () => {
     const translator = new Translator({
       languagePack: languagePackZh,
     });
-    it('returns null for null input', () => {
-      expect(translator.translate(null)).toBeNull();
-    });
-    it('returns undefined for undefined input', () => {
-      expect(translator.translate(undefined)).toBeUndefined();
-    });
     it('returns original text for unknown text', () => {
       expect(translator.translate('abc')).toEqual('abc');
     });
@@ -47,19 +41,12 @@ describe('Translator', () => {
     const translator = new Translator({
       languagePack: languagePackZh,
     });
-    it('returns null if singular or plural is null', () => {
-      expect(translator.translateWithNumber(null, 'plural')).toBeNull();
-      expect(translator.translateWithNumber('singular', null)).toBeNull();
-      expect(translator.translateWithNumber(null, null)).toBeNull();
-    });
-    it('returns undefined if singular or plural is undefined', () => {
-      expect(translator.translateWithNumber(undefined, 'plural')).toBeUndefined();
-      expect(translator.translateWithNumber('singular', undefined)).toBeUndefined();
-      expect(translator.translateWithNumber(undefined, undefined)).toBeUndefined();
-    });
     it('returns original text for unknown text', () => {
       expect(translator.translateWithNumber('fish', 'fishes', 1)).toEqual('fish');
     });
+    it('uses 0 as default value', () => {
+      expect(translator.translateWithNumber('box', 'boxes')).toEqual('boxes');
+    });
     it('translates simple text', () => {
       expect(translator.translateWithNumber('second', 'seconds', 1)).toEqual('秒');
     });
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.ts
similarity index 96%
rename from superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.js
rename to superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.ts
index 1df9058181dfc..a1df3a159614b 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.js
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/TranslatorSingleton.test.ts
@@ -2,7 +2,7 @@
 import mockConsole from 'jest-mock-console';
 import Translator from '../src/Translator';
 import { configure, t, tn } from '../src/TranslatorSingleton';
-import languagePackZh from './languagePacks/zh.json';
+import languagePackZh from './languagePacks/zh';
 
 describe('TranslatorSingleton', () => {
   describe('before configure()', () => {
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/index.test.js b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/index.test.ts
similarity index 100%
rename from superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/index.test.js
rename to superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/index.test.ts
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.json b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.json
deleted file mode 100644
index 07ed948c0817f..0000000000000
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "domain": "superset",
-  "locale_data": {
-    "superset": {
-      "": {
-        "domain": "superset",
-        "plural_forms": "nplurals=2; plural=(n != 1)",
-        "lang": "en"
-      },
-      "second": [""],
-      "Copy of %s": [""]
-    }
-  }
-}
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.ts b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.ts
new file mode 100644
index 0000000000000..c3113a85f0414
--- /dev/null
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/en.ts
@@ -0,0 +1,18 @@
+import { LanguagePack } from 'jed';
+
+const languagePack: LanguagePack = {
+  domain: 'superset',
+  locale_data: {
+    superset: {
+      '': {
+        domain: 'superset',
+        plural_forms: 'nplurals=2; plural=(n != 1)',
+        lang: 'en',
+      },
+      second: [''],
+      'Copy of %s': [''],
+    },
+  },
+};
+
+export default languagePack;
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.json b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.json
deleted file mode 100644
index d93afdbe11f12..0000000000000
--- a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "domain": "superset",
-  "locale_data": {
-    "superset": {
-      "": {
-        "domain": "superset",
-        "plural_forms": "nplurals=2; plural=(n != 1)",
-        "lang": "zh"
-      },
-      "second": ["秒"],
-      "Copy of %s": ["%s 的副本", "%s 的副本本本"]
-    }
-  }
-}
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.ts b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.ts
new file mode 100644
index 0000000000000..9b368c313c341
--- /dev/null
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/test/languagePacks/zh.ts
@@ -0,0 +1,18 @@
+import { LanguagePack } from 'jed';
+
+const languagePack: LanguagePack = {
+  domain: 'superset',
+  locale_data: {
+    superset: {
+      '': {
+        domain: 'superset',
+        plural_forms: 'nplurals=2; plural=(n != 1)',
+        lang: 'zh',
+      },
+      second: ['秒'],
+      'Copy of %s': ['%s 的副本', '%s 的副本本本'],
+    },
+  },
+};
+
+export default languagePack;
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/types/external.d.ts b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/types/external.d.ts
new file mode 100644
index 0000000000000..4ce1f22161a07
--- /dev/null
+++ b/superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-translation/types/external.d.ts
@@ -0,0 +1,22 @@
+declare module 'jed' {
+  export interface LanguagePack {
+    domain: string;
+    locale_data: {
+      superset: {
+        [key: string]: string[] | {
+          domain: string;
+          plural_forms: string;
+          lang: string;
+        };
+      };
+    }
+  }
+
+  export default class Jed {
+    constructor(languagepack: LanguagePack);
+
+    translate(input: string): Jed;
+    ifPlural(value: number, plural: string): Jed;
+    fetch(...args: any[]): string;
+  }
+}