react-nativeでプロジェクト作成する時の雛形

スポンサーリンク

備忘録

1.まずはプロジェクト作成

react-native init project_name

2.npmパッケージを追加

yarn add --dev typescript @types/react @types/react-native

3.tsconfig.jsonを作成

tsc --init

4.必要なディレクトリを作成

mkdir src build

src : typescriptのソースを置く
build : typescriptをbuildしたファイルが置かれる

5.tsconfig.jsonを編集

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "lib": ["es5", "es6", "dom"],                             /* Specify library files to be included in the compilation. */
    "allowJs": true,                       /* Allow javascript files to be compiled. */
    // "checkJs": true,                       /* Report errors in .js files. */
    "jsx": "react-native",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
    "sourceMap": true,                     /* Generates corresponding '.map' file. */
    // "outFile": "./",                       /* Concatenate and emit output to single file. */
    "outDir": "./build",                        /* Redirect output structure to the directory. */
    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    // "removeComments": true,                /* Do not emit comments to output. */
    // "noEmit": true,                        /* Do not emit outputs. */
    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */

    /* Strict Type-Checking Options */
    "strict": true,                           /* Enable all strict type-checking options. */
    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
    // "strictNullChecks": true,              /* Enable strict null checks. */
    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
    // "noUnusedLocals": true,                /* Report errors on unused locals. */
    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */

    /* Module Resolution Options */
    "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
    // "typeRoots": [],                       /* List of folders to include type definitions from. */
    "types": ["react", "react-native"],                           /* Type declaration files to be included in compilation. */
    "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */

    /* Source Map Options */
    // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
    // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */

    /* Experimental Options */
    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
  },
  "include": [
    "src/**/*"
  ],
  "exclude" [
    "index.js",
    "build",
    "node_modules"
  ]
}

6.package.jsonのscriptsに追記する

  "scripts": {
    "start":    "node node_modules/react-native/local-cli/cli.js start",
    "android":  "node node_modules/react-native/local-cli/cli.js run-android",
    "ios":      "node node_modules/react-native/local-cli/cli.js run-ios --simulator 'iPhone 8'",
    "prebuild": "rm -rf build",
    "build":    "tsc",
    "build-w":  "tsc -w",
    "test":     "jest"
  }

7.typescript向けに既存ファイルを変更する

mv App.js src/index.tsx

index.tsxの中身

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import * as React from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  View
} from 'react-native';

interface Props {}
interface State {}

const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' +
    'Cmd+D or shake for dev menu',
  android: 'Double tap R on your keyboard to reload,\n' +
    'Shake or press menu button for dev menu',
});

export default class App extends React.Component<Props, State> {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit App.js
        </Text>
        <Text style={styles.instructions}>
          {instructions}
        </Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

index.jsの中身

import { AppRegistry } from 'react-native';
import App from './build';

AppRegistry.registerComponent('project_name', () => App);

8.git登録

とりあえず、この時点でgitに登録

git init
git add -A
git commit -m 'initial commit'

9.実行してみる

yarn run start
yarn run build-w

上記のコマンドで以下のエラーメッセージが出る場合が有る。

node_modules/@types/react-native/index.d.ts(8831,18): 
error TS2717: Subsequent property declarations must have the same type.  
Property 'geolocation' must be of type 'Geolocation', but here has type 'GeolocationStatic'.

[@types/react-native] Property ‘geolocation’ must be of type ‘Geolocation’, but here has type ‘GeolocationStatic’.

何かここで議論中らしい。
とりあえず、スレッドに書かれているように、tsconfig.jsonに以下を追記する事で回避可能。

"compilerOptions": {
  [省略]
  "skipLibCheck": true
}

yarn run ios
yarn run android // 先にemulatorを起動しておく

simulator

simulator(android emulatorも同様)でこんな画面が表示されれば成功。
失敗すると真っ赤な画面になるけど、その場合は最初のyarn run startしたコンソールにログが出るので、それを手掛かりに修正する。

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