使用Types with Typescript和Expo时获取“无效调用”

Question

我试图在使用expo-cli创建的本地应用程序中播放一些音频。

代码用typescript编写，违规代码如下所示，取自expo.io documentation：

import * as React from 'react'
import { WorkoutComponent } from "./WorkoutExecutor";
import { Audio } from 'expo';

export default class AudioPlayer {

    private async playAudio(fileName: string) {
        console.log("Playing Audio: " + fileName);
        const soundFile = './assets/sounds/' + fileName + '.mp3';
        try {
            const { sound: soundObject, status } = await Audio.Sound.createAsync(
              require(soundFile),
              { shouldPlay: true }
            );
            // Your sound is playing!
          } catch (error) {
              console.log(error);
            // An error occurred!
          }

    }
[...]
}

当应用程序加载时，它会出现以下错误，甚至在它到达屏幕时会发出声音

[...]\src\AudioPlayer.ts:Invalid call at line 13: require(soundFile)

我意识到这个例子是用javascript而不是打字稿，但是我错过了什么？

我的tsconfig.json是expo typescript示例中的一个，看起来像这样

{
  "compilerOptions": {
    "baseUrl": "./src",
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "forceConsistentCasingInFileNames": true,
    "importHelpers": true,
    "jsx": "react-native",
    "module": "es2015",
    "moduleResolution": "node",
    "noEmitHelpers": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    // Using the type definitions in @types/expo becuase they are still better than the ones provided by expo. See SvgScreen.tsx and SystemFontsScreen.tsx.
    "paths": {
      "expo": [
        "../node_modules/@types/expo",
        "../node_modules/expo"
      ],
    },
    "skipLibCheck": true,
    "strict": true,
    "target": "es2017"
  },
  "exclude": [
    "node_modules"
  ]
}

Answer 1

我通过Twitter得到了帮助，问题是require()无法使用动态值。这也解释了为什么错误发生在应用程序被加载之前，因为它试图在构建或加载时解析require，而不是像我想象的那样在运行时解析。