这里有些奇怪的行为。我正在使用mocha编写单元测试，该单元测试调用将LatLng转换为传单L.LatLng对象的Class的静态方法。在测试结束时，我正在检查返回的对象是否确实是L.LatLng的实例。令人惊讶的是，即使它确实是L.LatLng的一个实例，该测试也失败了。闲逛了几个小时后，我得以将问题缩小到以下范围。 如果我通过tsconfig路径参数导入Converter类

import { LeafletConverter } from '@maps/leaflet/leaflet-converter';

然后测试失败。但是，如果我通过相对路径导入它：

import { LeafletConverter } from '../../../app/maps/leaflet/leaflet-converter';

然后，测试通过且没有错误。问题是，这是怎么回事，有什么办法可以保持'@maps / ...'导入样式？

版本：

$ tsc --version
Version 3.6.3

VSCode 1.39.2

测试文件：

    import { expect } from 'chai';
    import 'mocha';
    import L from "leaflet";
    import { LeafletConverter as DirectLeafletConverter } from '../../../app/maps/leaflet/leaflet-converter';
    import { LeafletConverter } from '@maps/leaflet/leaflet-converter';
    import { LatLng } from '@maps/lat-lng';


    describe.only('maps/leaflet/asdf',() => {


        it('tsconfig path import - this test fails',() => {
            const leafletll = LeafletConverter.toLeafletLatLng(new LatLng(1,2));
            const test = leafletll instanceof L.LatLng;
            expect(test).to.be.true;
        });

        it('direct import - this test passes',() => {
            const leafletll = DirectLeafletConverter.toLeafletLatLng(new LatLng(1,2));
            const test = leafletll instanceof L.LatLng;
            expect(test).to.be.true;
        });


    });

LeafletConverter.ts

    import { LatLng } from "@maps/lat-lng";
    import L from "leaflet";
    import { LatLngBounds } from "@maps/lat-lng-bounds";

    export abstract class LeafletConverter {
        private constructor(){}

...


        public static toLeafletLatLng(latLng: LatLng): L.LatLng  {
            let result: L.LatLng = null;

            if(LatLng.isValid(latLng)) {
                result = L.latLng(latLng.lat,latLng.lng);
            }

            return result;
        }

...

    }

测试命令和输出：

$ "C:\\Program Files\\nodejs\\node.exe" --inspect-brk=22915 node_modules\\mocha\\bin\\_mocha -r ts-node/register -r tsconfig-paths/register --timeout 30000 --colors C:\\Users\\Asdf\\tmp\\rm.js\\group
test/**/*.test.ts
Debugger listening on ws://127.0.0.1:22915/e1b8ec38-90ac-41dd-aded-c2c20e2ffa28
For help,see: https://nodejs.org/en/docs/inspector
Debugger attached.


  maps/leaflet/asdf
    1) tsconfig path import
    √ direct import        


  1 passing (14ms)
  1 failing

  1) maps/leaflet/asdf
       tsconfig path import:

      AssertionError: expected false to be true
      + expected - actual

      -false
      +true

      at Context.<anonymous> (C:\Users\Asdf\tmp\rm.js\group-clusterer\src\test\maps\leaflet\asdf.test.ts:16:27)



Waiting for the debugger to disconnect...

package.json

{
  "name": "typescript-webpack-seed-project","version": "0.0.1","description": "","main": "index.js","scripts": {
    "test": "mocha -r ts-node/register -r tsconfig-paths/register src/test/**/*.test.ts","compile": "npx tsc","cc": "npx tsc -w","build": "webpack"
  },"author": "","license": "ISC","devDependencies": {
    "@types/chai": "^4.2.3","@types/googlemaps": "^3.38.0","@types/leaflet": "^1.5.5","@types/mocha": "^5.2.7","@types/node": "^12.12.5","@types/q": "^1.5.2","@types/rbush": "^2.0.3","chai": "^4.2.0","jsdom": "15.2.1","jsdom-global": "3.0.2","leaflet": "^1.5.1","mocha": "^6.2.1","ts-loader": "^6.2.0","ts-node": "^8.4.1","tsconfig-paths": "^3.9.0","tsconfig-paths-webpack-plugin": "^3.2.0","tslint": "^5.20.0","typescript": "^3.6.3","uglifyjs-webpack-plugin": "^2.2.0","webpack": "^4.41.2","webpack-cli": "^3.3.9"
  },"dependencies": {
    "q": "^1.5.1","rbush": "^3.0.1"
  }
}