在Mocha測試中使用帶有ts-node的assert

Question

我在test.ts創建了一個mocha測試

import * as assert from "assert";

describe('it', () => {
  it('should ', done => {
    assert.strictEqual(true, false);
    done();
  });
});

我的package.json的devDependencies ：

"devDependencies": {
    "@types/mocha": "^5.2.5",
    "@types/node": "^10.12.18",
    "mocha": "^5.2.0",
    "ts-node": "^8.0.1",
    "typescript": "^3.2.4"
  }

tsconfig.json ：

{
  "compilerOptions": {
    "target": "es2015",
    "module": "commonjs",
    "sourceMap": true,
    "declaration": true,
    "outDir": "./dist",
    "strict": true,
    "types": ["mocha"]
  }
}

運行ts-node ，出現此錯誤：

error TS2307: Cannot find module 'assert'.

我的命令行調用是這樣的：

./node_modules/mocha/bin/mocha -r ts-node/register test/test.ts

常規的tsc不會引發任何錯誤。

Answer 1

通過此問題在GitHub上的注釋解決了它：

tsconfig.json types需要包含node ：

{
  "compilerOptions": {
    "target": "es2015",
    "module": "commonjs",
    "sourceMap": true,
    "declaration": true,
    "outDir": "./dist",
    "strict": true,
    "types": ["mocha", "node"]
  }
}