diff --git a/packages/cli-types/src/index.ts b/packages/cli-types/src/index.ts
index 39b5c5518..7738f22ec 100644
--- a/packages/cli-types/src/index.ts
+++ b/packages/cli-types/src/index.ts
@@ -94,6 +94,12 @@ export interface Dependency {
   params: InquirerPrompt[];
 }
 
+export type ProjectConfig = {
+  android?: AndroidProjectConfig;
+  ios?: IOSProjectConfig;
+  [key: string]: any;
+};
+
 /**
  * @property root - Root where the configuration has been resolved from
  * @property reactNativePath - Path to React Native source
@@ -104,14 +110,10 @@ export interface Dependency {
  * @property commands - An array of commands that are present in 3rd party packages
  * @property haste - Haste configuration resolved based on available plugins
  */
-export interface Config {
+export type Config = {
   root: string;
   reactNativePath: string;
-  project: {
-    android?: AndroidProjectConfig;
-    ios?: IOSProjectConfig;
-    [key: string]: any;
-  };
+  project: ProjectConfig;
   assets: string[];
   dependencies: {[key: string]: Dependency};
   platforms: {
@@ -134,17 +136,15 @@ export interface Config {
     platforms: Array<string>;
     providesModuleNodeModules: Array<string>;
   };
-}
-
-type Diff<T, U> = T extends U ? never : T;
+};
 
 /**
- * Shares some structure with ConfigT, except that haste and root
+ * Shares some structure with Config, except that haste and root
  * are calculated and can't be defined
  */
-export type UserConfig = Diff<Config, {root: any; haste: any}> & {
-  reactNativePath: string | void;
 
+export type UserConfig = Omit<Config, 'root' | 'haste'> & {
+  reactNativePath: string | void;
   // Additional project settings
   project: {
     android?: AndroidProjectParams;
@@ -153,6 +153,20 @@ export type UserConfig = Diff<Config, {root: any; haste: any}> & {
   };
 };
 
+export type UserDependencyConfig = {
+  // Additional dependency settings
+  dependency: Omit<Dependency, 'name' | 'root'>;
+  // An array of commands that ship with the dependency
+  commands: Command[];
+  // An array of extra platforms to load
+  platforms: Config['platforms'];
+  // Haste config defined by legacy `rnpm`
+  haste?: {
+    platforms: string[];
+    providesModuleNodeModules: string[];
+  };
+};
+
 export {
   IOSProjectConfig,
   IOSProjectParams,
diff --git a/packages/cli-types/src/ios.ts b/packages/cli-types/src/ios.ts
index 173f2116d..7129dffd3 100644
--- a/packages/cli-types/src/ios.ts
+++ b/packages/cli-types/src/ios.ts
@@ -10,7 +10,7 @@ export interface IOSProjectParams {
   sharedLibraries?: string[];
   libraryFolder?: string;
   plist: Array<any>;
-  scriptPhases: Array<any>;
+  scriptPhases?: Array<any>;
 }
 
 export interface IOSDependencyParams extends IOSProjectParams {}
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 4eafca169..8ca6c698a 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -70,6 +70,8 @@
   "devDependencies": {
     "@types/command-exists": "^1.2.0",
     "@types/graceful-fs": "^4.1.3",
+    "@types/cosmiconfig": "^5.0.3",
+    "@types/hapi__joi": "^15.0.4",
     "@types/minimist": "^1.2.0",
     "@types/mkdirp": "^0.5.2",
     "@types/semver": "^6.0.2",
diff --git a/packages/cli/src/cliEntry.js b/packages/cli/src/cliEntry.js
index 062960709..f65fc8558 100644
--- a/packages/cli/src/cliEntry.js
+++ b/packages/cli/src/cliEntry.js
@@ -23,6 +23,7 @@ import {logger} from '@react-native-community/cli-tools';
 // $FlowFixMe - converted to TS
 import {setProjectDir} from './tools/packageManager';
 import pkgJson from '../package.json';
+// $FlowFixMe - converted to TS
 import loadConfig from './tools/config';
 
 commander
diff --git a/packages/cli/src/commands/info/__tests__/info.test.ts b/packages/cli/src/commands/info/__tests__/info.test.ts
index 6635182e7..a888126d1 100644
--- a/packages/cli/src/commands/info/__tests__/info.test.ts
+++ b/packages/cli/src/commands/info/__tests__/info.test.ts
@@ -1,7 +1,6 @@
 // @flow
 import info from '../info';
 import {logger} from '@react-native-community/cli-tools';
-// eslint-disable-next-line import/namespace, import/default
 import loadConfig from '../../../tools/config';
 
 jest.mock('../../../tools/config');
diff --git a/packages/cli/src/commands/install/install.ts b/packages/cli/src/commands/install/install.ts
index fcf95ab69..6f3a8fbce 100644
--- a/packages/cli/src/commands/install/install.ts
+++ b/packages/cli/src/commands/install/install.ts
@@ -8,8 +8,7 @@
 import {logger} from '@react-native-community/cli-tools';
 import * as PackageManager from '../../tools/packageManager';
 import link from '../link/link';
-// @ts-ignore FIXME after converting tools/config
-import loadConfig from '../../tools/config'; // eslint-disable-line import/namespace, import/default
+import loadConfig from '../../tools/config';
 
 async function install(args: Array<string>): Promise<void> {
   const name = args[0];
diff --git a/packages/cli/src/commands/link/__tests__/link-test.ts b/packages/cli/src/commands/link/__tests__/link-test.ts
index fd4974f69..bcb7021cc 100644
--- a/packages/cli/src/commands/link/__tests__/link-test.ts
+++ b/packages/cli/src/commands/link/__tests__/link-test.ts
@@ -1,5 +1,5 @@
 import {func as link} from '../link';
-import loadConfig from '../../../tools/config'; // eslint-disable-line import/namespace, import/default
+import loadConfig from '../../../tools/config';
 import makeHook from '../makeHook';
 jest.mock('chalk', () => ({grey: str => str, bold: str => str}));
 jest.mock('../../../tools/config');
diff --git a/packages/cli/src/commands/upgrade/__tests__/upgrade.test.ts b/packages/cli/src/commands/upgrade/__tests__/upgrade.test.ts
index ec9a01af8..4a090e5d1 100644
--- a/packages/cli/src/commands/upgrade/__tests__/upgrade.test.ts
+++ b/packages/cli/src/commands/upgrade/__tests__/upgrade.test.ts
@@ -5,7 +5,7 @@ import snapshotDiff from 'snapshot-diff';
 import stripAnsi from 'strip-ansi';
 import upgrade from '../upgrade';
 import {fetch, logger} from '@react-native-community/cli-tools';
-import loadConfig from '../../../tools/config'; // eslint-disable-line import/namespace, import/default
+import loadConfig from '../../../tools/config';
 import merge from '../../../tools/merge';
 
 jest.mock('https');
diff --git a/packages/cli/src/tools/config/__mocks__/index.js b/packages/cli/src/tools/config/__mocks__/index.ts
similarity index 96%
rename from packages/cli/src/tools/config/__mocks__/index.js
rename to packages/cli/src/tools/config/__mocks__/index.ts
index 78f27628a..08a213a9a 100644
--- a/packages/cli/src/tools/config/__mocks__/index.js
+++ b/packages/cli/src/tools/config/__mocks__/index.ts
@@ -1,7 +1,3 @@
-/**
- * @flow
- */
-
 export default function mockedLoadConfig() {
   return {
     root: '/project/root',
diff --git a/packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.js b/packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.ts
similarity index 91%
rename from packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.js
rename to packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.ts
index d85dee2ae..6b739df3d 100644
--- a/packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.js
+++ b/packages/cli/src/tools/config/__mocks__/resolveNodeModuleDir.ts
@@ -1,7 +1,3 @@
-/**
- * @flow
- */
-
 const path = require('path');
 
 export default function resolveNodeModuleDir(
diff --git a/packages/cli/src/tools/config/__tests__/__snapshots__/index-test.js.snap b/packages/cli/src/tools/config/__tests__/__snapshots__/index-test.ts.snap
similarity index 100%
rename from packages/cli/src/tools/config/__tests__/__snapshots__/index-test.js.snap
rename to packages/cli/src/tools/config/__tests__/__snapshots__/index-test.ts.snap
diff --git a/packages/cli/src/tools/config/__tests__/findAssets-test.js b/packages/cli/src/tools/config/__tests__/findAssets-test.ts
similarity index 100%
rename from packages/cli/src/tools/config/__tests__/findAssets-test.js
rename to packages/cli/src/tools/config/__tests__/findAssets-test.ts
diff --git a/packages/cli/src/tools/config/__tests__/findDependencies-test.js b/packages/cli/src/tools/config/__tests__/findDependencies-test.ts
similarity index 100%
rename from packages/cli/src/tools/config/__tests__/findDependencies-test.js
rename to packages/cli/src/tools/config/__tests__/findDependencies-test.ts
diff --git a/packages/cli/src/tools/config/__tests__/index-test.js b/packages/cli/src/tools/config/__tests__/index-test.ts
similarity index 100%
rename from packages/cli/src/tools/config/__tests__/index-test.js
rename to packages/cli/src/tools/config/__tests__/index-test.ts
diff --git a/packages/cli/src/tools/config/errors.js b/packages/cli/src/tools/config/errors.ts
similarity index 64%
rename from packages/cli/src/tools/config/errors.js
rename to packages/cli/src/tools/config/errors.ts
index 3b1fbbc55..d3409befb 100644
--- a/packages/cli/src/tools/config/errors.js
+++ b/packages/cli/src/tools/config/errors.ts
@@ -1,37 +1,17 @@
-/**
- * @flow
- */
 import {CLIError} from '@react-native-community/cli-tools';
-
-type JoiErrorDetails<K, T> = {
-  message: string,
-  path: string[],
-  type: K,
-  context: T,
-};
-
-type JoiErrorT = {
-  details: Array<
-    JoiErrorDetails<
-      'object.allowUnknown' | 'object.base' | 'string.base',
-      {
-        key: string,
-        label: string,
-        value: Object,
-      },
-    >,
-  >,
-};
+import {ValidationError} from '@hapi/joi';
 
 export class JoiError extends CLIError {
-  constructor(joiError: JoiErrorT) {
+  constructor(joiError: ValidationError) {
     super(
       joiError.details
         .map(error => {
           const name = error.path.join('.');
           switch (error.type) {
             case 'object.allowUnknown': {
-              const value = JSON.stringify(error.context.value);
+              const value = JSON.stringify(
+                error.context && error.context.value,
+              );
               return `
                 Unknown option ${name} with value "${value}" was found.
                 This is either a typing error or a user mistake. Fixing it will remove this message.
@@ -40,7 +20,7 @@ export class JoiError extends CLIError {
             case 'object.base':
             case 'string.base': {
               const expectedType = error.type.replace('.base', '');
-              const actualType = typeof error.context.value;
+              const actualType = typeof (error.context && error.context.value);
               return `
                 Option ${name} must be a ${expectedType}, instead got ${actualType}
               `;
diff --git a/packages/cli/src/tools/config/findAssets.js b/packages/cli/src/tools/config/findAssets.ts
similarity index 67%
rename from packages/cli/src/tools/config/findAssets.js
rename to packages/cli/src/tools/config/findAssets.ts
index 416581db8..54394ddf2 100644
--- a/packages/cli/src/tools/config/findAssets.js
+++ b/packages/cli/src/tools/config/findAssets.ts
@@ -1,11 +1,7 @@
-/**
- * @flow
- */
-
 import glob from 'glob';
 import path from 'path';
 
-const findAssetsInFolder = folder => {
+const findAssetsInFolder = (folder: string): string[] => {
   const assets = glob.sync(path.join(folder, '**'), {nodir: true});
   if (process.platform === 'win32') {
     return assets.map(asset => asset.split('/').join('\\'));
@@ -19,12 +15,14 @@ const findAssetsInFolder = folder => {
  *
  * It returns an array of absolute paths to files found.
  */
-export default function findAssets(folder: string, assets: string[]) {
+export default function findAssets(
+  folder: string,
+  assets: Array<string>,
+): Array<string> {
   return (assets || [])
     .map(asset => path.join(folder, asset))
     .reduce(
-      (acc, assetPath) =>
-        (acc.concat(findAssetsInFolder(assetPath)): Array<string>),
-      [],
+      (acc, assetPath) => acc.concat(findAssetsInFolder(assetPath)),
+      [] as string[],
     );
 }
diff --git a/packages/cli/src/tools/config/findDependencies.js b/packages/cli/src/tools/config/findDependencies.ts
similarity index 96%
rename from packages/cli/src/tools/config/findDependencies.js
rename to packages/cli/src/tools/config/findDependencies.ts
index c5f392964..4d5eb39f1 100644
--- a/packages/cli/src/tools/config/findDependencies.js
+++ b/packages/cli/src/tools/config/findDependencies.ts
@@ -1,7 +1,3 @@
-/**
- * @flow
- */
-
 import path from 'path';
 import fs from 'fs';
 
diff --git a/packages/cli/src/tools/config/index.js b/packages/cli/src/tools/config/index.ts
similarity index 85%
rename from packages/cli/src/tools/config/index.js
rename to packages/cli/src/tools/config/index.ts
index 1037c0a70..f5b1f1ca2 100644
--- a/packages/cli/src/tools/config/index.js
+++ b/packages/cli/src/tools/config/index.ts
@@ -1,8 +1,12 @@
-/**
- * @flow
- */
 import path from 'path';
 import chalk from 'chalk';
+import {
+  UserDependencyConfig,
+  ProjectConfig,
+  Dependency,
+  UserConfig,
+  Config,
+} from '@react-native-community/cli-types';
 import {logger, inlineString} from '@react-native-community/cli-tools';
 import * as ios from '@react-native-community/cli-platform-ios';
 import * as android from '@react-native-community/cli-platform-android';
@@ -13,26 +17,18 @@ import {
   readConfigFromDisk,
   readDependencyConfigFromDisk,
 } from './readConfigFromDisk';
-import type {
-  ConfigT,
-  UserDependencyConfigT,
-  UserConfigT,
-  DependencyConfigT,
-} from 'types';
-// $FlowFixMe - converted to TS
 import assign from '../assign';
-// $FlowFixMe - converted to TS
 import merge from '../merge';
 import resolveNodeModuleDir from './resolveNodeModuleDir';
 
 function getDependencyConfig(
   root: string,
   dependencyName: string,
-  finalConfig: ConfigT,
-  config: UserDependencyConfigT,
-  userConfig: UserConfigT,
+  finalConfig: Config,
+  config: UserDependencyConfig,
+  userConfig: UserConfig,
   isPlatform: boolean,
-): DependencyConfigT {
+): Dependency {
   return merge(
     {
       root,
@@ -52,24 +48,24 @@ function getDependencyConfig(
                 );
           return dependency;
         },
-        {},
+        {} as Config['platforms'],
       ),
       assets: findAssets(root, config.dependency.assets),
       hooks: config.dependency.hooks,
       params: config.dependency.params,
     },
     userConfig.dependencies[dependencyName] || {},
-  );
+  ) as Dependency;
 }
 
 /**
  * Loads CLI configuration
  */
-function loadConfig(projectRoot: string = process.cwd()): ConfigT {
-  let lazyProject;
+function loadConfig(projectRoot: string = process.cwd()): Config {
+  let lazyProject: ProjectConfig;
   const userConfig = readConfigFromDisk(projectRoot);
 
-  const initialConfig: ConfigT = {
+  const initialConfig: Config = {
     root: projectRoot,
     get reactNativePath() {
       return userConfig.reactNativePath
@@ -93,29 +89,32 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
 
       lazyProject = {};
       for (const platform in finalConfig.platforms) {
-        lazyProject[platform] = finalConfig.platforms[platform].projectConfig(
-          projectRoot,
-          userConfig.project[platform] || {},
-        );
+        const platformConfig = finalConfig.platforms[platform];
+        if (platformConfig) {
+          lazyProject[platform] = platformConfig.projectConfig(
+            projectRoot,
+            userConfig.project[platform] || {},
+          );
+        }
       }
 
       return lazyProject;
     },
   };
 
-  let depsWithWarnings = [];
+  let depsWithWarnings: Array<[string, string]> = [];
 
   const finalConfig = Array.from(
     new Set([
       ...Object.keys(userConfig.dependencies),
       ...findDependencies(projectRoot),
     ]),
-  ).reduce((acc: ConfigT, dependencyName) => {
+  ).reduce((acc: Config, dependencyName) => {
     const localDependencyRoot =
       userConfig.dependencies[dependencyName] &&
       userConfig.dependencies[dependencyName].root;
-    let root;
-    let config;
+    let root: string;
+    let config: UserDependencyConfig;
     try {
       root =
         localDependencyRoot ||
@@ -147,9 +146,11 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
      */
     if (dependencyName === 'react-native') {
       if (Object.keys(config.platforms).length === 0) {
+        // @ts-ignore - this code is soon going to be removed
         config.platforms = {ios, android};
       }
       if (config.commands.length === 0) {
+        // @ts-ignore - this code is soon going to be removed
         config.commands = [...ios.commands, ...android.commands];
       }
     }
@@ -167,10 +168,9 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
       platforms: Object.keys(config.platforms),
     };
 
-    return (assign({}, acc, {
+    return assign({}, acc, {
       dependencies: assign({}, acc.dependencies, {
-        // $FlowExpectedError: Dynamic getters are not supported
-        get [dependencyName]() {
+        get [dependencyName](): Dependency {
           return getDependencyConfig(
             root,
             dependencyName,
@@ -193,7 +193,7 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
         ],
         platforms: [...acc.haste.platforms, ...haste.platforms],
       },
-    }): ConfigT);
+    }) as Config;
   }, initialConfig);
 
   if (depsWithWarnings.length) {
diff --git a/packages/cli/src/tools/config/readConfigFromDisk.js b/packages/cli/src/tools/config/readConfigFromDisk.ts
similarity index 70%
rename from packages/cli/src/tools/config/readConfigFromDisk.js
rename to packages/cli/src/tools/config/readConfigFromDisk.ts
index 197ed237b..069d354a5 100644
--- a/packages/cli/src/tools/config/readConfigFromDisk.js
+++ b/packages/cli/src/tools/config/readConfigFromDisk.ts
@@ -1,33 +1,52 @@
-/**
- * @flow
- *
- * Loads and validates a project configuration
- */
 import Joi from '@hapi/joi';
 import cosmiconfig from 'cosmiconfig';
 import path from 'path';
 import chalk from 'chalk';
-import {
-  type UserDependencyConfigT,
-  type UserConfigT,
-  type CommandT,
-} from 'types';
 import {JoiError} from './errors';
 import * as schema from './schema';
 import {logger} from '@react-native-community/cli-tools';
 import resolveReactNativePath from './resolveReactNativePath';
-
+import {
+  UserConfig,
+  AndroidProjectConfig,
+  AndroidDependencyConfig,
+  IOSProjectConfig,
+  IOSDependencyConfig,
+  Command,
+  InquirerPrompt,
+  UserDependencyConfig,
+} from '@react-native-community/cli-types';
 const MIGRATION_GUIDE = `Migration guide: ${chalk.dim.underline(
   'https://github.com/react-native-community/cli/blob/master/docs/configuration.md',
 )}`;
 
+type LegacyConfig = {
+  ios: IOSProjectConfig;
+  android: AndroidProjectConfig;
+  assets: string[];
+  reactNativePath: string;
+  hooks?: {
+    [key: string]: string;
+  };
+};
+
+type LegacyDependencyConfig = {
+  platform: any;
+  ios: IOSDependencyConfig;
+  android: AndroidDependencyConfig;
+  assets: string[];
+  plugin: Array<string>;
+  params: InquirerPrompt[];
+  haste: any;
+};
+
 /**
  * Places to look for the new configuration
  */
 const searchPlaces = ['react-native.config.js'];
 
-function readLegacyConfigFromDisk(rootFolder: string): UserConfigT | void {
-  let config;
+function readLegacyConfigFromDisk(rootFolder: string): UserConfig | void {
+  let config: LegacyConfig;
 
   try {
     config = require(path.join(rootFolder, 'package.json')).rnpm;
@@ -40,7 +59,7 @@ function readLegacyConfigFromDisk(rootFolder: string): UserConfigT | void {
     return undefined;
   }
 
-  const transformedConfig = {
+  const transformedConfig: UserConfig = {
     project: {
       ios: config.ios,
       android: config.android,
@@ -48,6 +67,7 @@ function readLegacyConfigFromDisk(rootFolder: string): UserConfigT | void {
     assets: config.assets,
     commands: [],
     dependencies: {},
+    // @ts-ignore - TODO: platforms can be empty, adjust types
     platforms: {},
     get reactNativePath() {
       return config.reactNativePath
@@ -71,7 +91,7 @@ function readLegacyConfigFromDisk(rootFolder: string): UserConfigT | void {
  * Reads a project configuration as defined by the user in the current
  * workspace.
  */
-export function readConfigFromDisk(rootFolder: string): UserConfigT {
+export function readConfigFromDisk(rootFolder: string): UserConfig {
   const explorer = cosmiconfig('react-native', {searchPlaces});
 
   const {config} = explorer.searchSync(rootFolder) || {
@@ -84,7 +104,7 @@ export function readConfigFromDisk(rootFolder: string): UserConfigT {
     throw new JoiError(result.error);
   }
 
-  return result.value;
+  return result.value as UserConfig;
 }
 
 /**
@@ -93,16 +113,17 @@ export function readConfigFromDisk(rootFolder: string): UserConfigT {
  */
 export function readDependencyConfigFromDisk(
   rootFolder: string,
-): {config: UserDependencyConfigT, legacy?: boolean} {
+): {config: UserDependencyConfig; legacy?: boolean} {
   const explorer = cosmiconfig('react-native', {
     stopDir: rootFolder,
     searchPlaces,
   });
 
-  const {config, legacy} = explorer.searchSync(rootFolder) || {
-    config: readLegacyDependencyConfigFromDisk(rootFolder),
-    legacy: true,
-  };
+  const searchResult = explorer.searchSync(rootFolder);
+  const legacy = !searchResult;
+  let config = searchResult
+    ? (searchResult.config as UserDependencyConfig)
+    : (readLegacyDependencyConfigFromDisk(rootFolder) as UserDependencyConfig);
 
   const result = Joi.validate(config, schema.dependencyConfig);
 
@@ -120,16 +141,13 @@ export function readDependencyConfigFromDisk(
  * Each of the files can export a commands (object) or an array of commands
  */
 const loadProjectCommands = (
-  root,
-  commands: ?(Array<string> | string),
-): Array<CommandT> => {
-  return []
+  root: string,
+  commands: Array<string> | string | undefined,
+): Array<Command> => {
+  return ([] as string[])
     .concat(commands || [])
-    .reduce((acc: Array<CommandT>, cmdPath: string) => {
-      const cmds: Array<CommandT> | CommandT = require(path.join(
-        root,
-        cmdPath,
-      ));
+    .reduce((acc: Array<Command>, cmdPath: string) => {
+      const cmds: Array<Command> | Command = require(path.join(root, cmdPath));
       return acc.concat(cmds);
     }, []);
 };
@@ -139,14 +157,15 @@ const loadProjectCommands = (
  */
 function readLegacyDependencyConfigFromDisk(
   rootFolder: string,
-): ?UserDependencyConfigT {
-  let config = {};
+): UserDependencyConfig | undefined {
+  let config = {} as LegacyDependencyConfig;
 
   try {
     config = require(path.join(rootFolder, 'package.json')).rnpm;
   } catch (error) {
     // package.json is usually missing in local libraries that are not in
     // project "dependencies", so we just return a bare config
+    // @ts-ignore - TODO: platforms can be empty, adjust types
     return {
       dependency: {
         platforms: {},
@@ -163,13 +182,14 @@ function readLegacyDependencyConfigFromDisk(
     return undefined;
   }
 
-  const transformedConfig = {
+  const transformedConfig: UserDependencyConfig = {
     dependency: {
       platforms: {
         ios: config.ios,
         android: config.android,
       },
       assets: config.assets,
+      // @ts-ignore – likely a bug, but we don't care because legacy config is soon to be removed
       hooks: config.commands,
       params: config.params,
     },
diff --git a/packages/cli/src/tools/config/resolveNodeModuleDir.js b/packages/cli/src/tools/config/resolveNodeModuleDir.ts
similarity index 79%
rename from packages/cli/src/tools/config/resolveNodeModuleDir.js
rename to packages/cli/src/tools/config/resolveNodeModuleDir.ts
index 09a0e4917..7a03950cd 100644
--- a/packages/cli/src/tools/config/resolveNodeModuleDir.js
+++ b/packages/cli/src/tools/config/resolveNodeModuleDir.ts
@@ -1,6 +1,3 @@
-/**
- * @flow
- */
 import path from 'path';
 
 /**
@@ -11,7 +8,6 @@ export default function resolveNodeModuleDir(
   packageName: string,
 ): string {
   return path.dirname(
-    // $FlowIssue: Wrong `require.resolve` type definition
     require.resolve(path.join(packageName, 'package.json'), {
       paths: [root],
     }),
diff --git a/packages/cli/src/tools/config/resolveReactNativePath.js b/packages/cli/src/tools/config/resolveReactNativePath.ts
similarity index 97%
rename from packages/cli/src/tools/config/resolveReactNativePath.js
rename to packages/cli/src/tools/config/resolveReactNativePath.ts
index dbce4e5c8..db5150fff 100644
--- a/packages/cli/src/tools/config/resolveReactNativePath.js
+++ b/packages/cli/src/tools/config/resolveReactNativePath.ts
@@ -1,6 +1,3 @@
-/**
- * @flow
- */
 import {CLIError} from '@react-native-community/cli-tools';
 
 import resolveNodeModuleDir from './resolveNodeModuleDir';
diff --git a/packages/cli/src/tools/config/schema.js b/packages/cli/src/tools/config/schema.ts
similarity index 97%
rename from packages/cli/src/tools/config/schema.js
rename to packages/cli/src/tools/config/schema.ts
index 7850227bd..79f53f36b 100644
--- a/packages/cli/src/tools/config/schema.js
+++ b/packages/cli/src/tools/config/schema.ts
@@ -1,9 +1,7 @@
-/**
- * @flow
- */
-import t from '@hapi/joi';
+import * as t from '@hapi/joi';
+import {SchemaLike} from '@hapi/joi';
 
-const map = (key, value) =>
+const map = (key: RegExp | SchemaLike, value: SchemaLike) =>
   t
     .object()
     .unknown(true)
diff --git a/packages/cli/src/tools/merge.ts b/packages/cli/src/tools/merge.ts
index cf4817ba2..e4305529c 100644
--- a/packages/cli/src/tools/merge.ts
+++ b/packages/cli/src/tools/merge.ts
@@ -4,10 +4,7 @@ import deepmerge from 'deepmerge';
  * `deepmerge` concatenates arrays by default instead of overwriting them.
  * We define custom merging function for arrays to change that behaviour
  */
-export default function merge(
-  x: Array<{[key: string]: any}>,
-  y: Array<{[key: string]: any}>,
-) {
+export default function merge<X, Y>(x: X, y: Y) {
   return deepmerge(x, y, {
     arrayMerge: (_destinationArray: any[], sourceArray: any[]): any[] =>
       sourceArray,
diff --git a/packages/platform-ios/src/link/common/registerNativeModule.ts b/packages/platform-ios/src/link/common/registerNativeModule.ts
index e5b26f1ad..8b2d21b94 100644
--- a/packages/platform-ios/src/link/common/registerNativeModule.ts
+++ b/packages/platform-ios/src/link/common/registerNativeModule.ts
@@ -17,8 +17,7 @@ export default function registerNativeModule(
   name: string,
   dependencyConfig: IOSDependencyConfig,
   // FIXME: Params is never used
-  _params?: any,
-  // @ts-ignore
+  _params: any | undefined,
   projectConfig: IOSProjectConfig,
 ) {
   if (projectConfig.podfile && dependencyConfig.podspecPath) {
diff --git a/yarn.lock b/yarn.lock
index 962931f1a..48086f37b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2032,6 +2032,13 @@
   resolved "https://registry.yarnpkg.com/@types/command-exists/-/command-exists-1.2.0.tgz#d97e0ed10097090e4ab0367ed425b0312fad86f3"
   integrity sha512-ugsxEJfsCuqMLSuCD4PIJkp5Uk2z6TCMRCgYVuhRo5cYQY3+1xXTQkSlPtkpGHuvWMjS2KTeVQXxkXRACMbM6A==
 
+"@types/cosmiconfig@^5.0.3":
+  version "5.0.3"
+  resolved "https://registry.yarnpkg.com/@types/cosmiconfig/-/cosmiconfig-5.0.3.tgz#880644bb155d4038d3b752159684b777b0a159dd"
+  integrity sha512-HgTGG7X5y9pLl3pixeo2XtDEFD8rq2EuH+S4mK6teCnAwWMucQl6v1D43hI4Uw1VJh6nu59lxLkqXHRl4uwThA==
+  dependencies:
+    "@types/node" "*"
+
 "@types/events@*":
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
@@ -2067,6 +2074,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/hapi__joi@*", "@types/hapi__joi@^15.0.4":
+  version "15.0.4"
+  resolved "https://registry.yarnpkg.com/@types/hapi__joi/-/hapi__joi-15.0.4.tgz#49e2e1e6da15ade0fdd6db4daf94aecb07bb391b"
+  integrity sha512-VSS6zc7AIOdHVXmqKaGNPYl8eGrMvWi0R5pt3evJL3UdxO8XS28/XAkBXNyLQoymHxhMd4bF3o1U9mZkWDeN8w==
+  dependencies:
+    "@types/hapi__joi" "*"
+
 "@types/istanbul-lib-coverage@^2.0.0":
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.0.tgz#1eb8c033e98cf4e1a4cedcaf8bcafe8cb7591e85"