获取ReferenceError：未定义fetch

Question

describe('Scan the product and register the scanning action', () => {
  const it = sagaHelper(scanProductSaga(scanProductAction(item)));

  it('logscan via ASL', (result) => {
    expect(result).toEqual(cps(ASLogger.logScan, xxx));
    return logScanResult;
  });

  it('should register the product', (result) => {
    expect(result).toEqual(call(doScan, logScanResult));
  });
});

const doScan = scanObj =>
  toJSON(fetch('https://xxxx.xxxxxx.com/logger/scans', {
    method: 'POST',
    headers: new Headers(CONTENT_TYPE_HEADERS),
    body: JSON.stringify(scanObj),
  }));

ReferenceError: fetch is not defined
      at doScan (/Users/andy/WebstormProjects/ASAP/api/index.js:81:11)....

什么会引起这样的问题？解决办法可能是什么？

Answer 1

react-native具有fetch默认值，但是Node.js上的测试环境没有fetch。

您可以像下面这样在测试代码的顶部导入fetch。

const fetch = require('node-fetch')

文件react-native-interface.js只声明fetch的类型。

declare var fetch: any;