如何运行用 TypeScript 编写的 Mocha 测试？
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How to run Mocha tests written in TypeScript?
提问by Thomas
Setup: I have a Node project (pure Node, no browser bits) written in TypeScript. I can use the TypeScript compiler (tsc) from the typescriptmodule to compile the code. So far so good.
设置：我有一个用 TypeScript 编写的 Node 项目（纯 Node，没有浏览器位）。我可以使用模块中的 TypeScript 编译器 ( tsc)typescript来编译代码。到现在为止还挺好。
However, I want to write tests using Mocha, and that's where I'm having trouble. I tried --compilers ts:typescript, but I keep getting errors like:
但是，我想使用 Mocha 编写测试，这就是我遇到麻烦的地方。我试过了--compilers ts:typescript，但我不断收到如下错误：
error TS5023: Unknown compiler option 'compilers'.
It looks like the command line to mochaends up being passed to tsc, which is obviously not good.
看起来命令行 tomocha最终被传递给tsc，这显然不好。
回答by jpierson
For anybody who has tried and had problems with typescript-requireyou may want to try ts-node.
对于任何尝试过typescript-require并遇到问题的人，您可能想尝试ts-node。
$ npm install -g ts-node
$ mocha test.ts --require ts-node/register src/**/*.spec.ts
It also appears that there has been some ongoing discussionabout deprecating typescript-require in favor of ts-node.
似乎也有一些关于弃用 typescript-require 以支持 ts-node 的持续讨论。
回答by Thomas
Don't use this answer. typescript-require is unmaintained, and ts-node is its replacement. Leaving this answer here for posterity.
不要使用这个答案。typescript-require 是未维护的，而 ts-node 是它的替代品。将这个答案留在这里供后代使用。
Found it. The typescriptmodule is actually like a "main" function; it runs the compiler as soon as the module is loaded. Not very nice design.
找到了。该typescript模块实际上是像一个“主”函数; 一旦加载模块，它就会运行编译器。不是很好的设计。
I poked at Mocha's acceptance tests, which show how to use a custom compiler for foofiles. They wire it up via the require.extensionsmechanism. I was halfway through writing a module that just calls tscon the command line when I realized that somebody must have done this before. So it's very simple:
我研究了 Mocha 的验收测试，它展示了如何对foo文件使用自定义编译器。他们通过require.extensions机制将它连接起来。tsc当我意识到之前一定有人这样做过时，我正在编写一个只在命令行上调用的模块。所以这很简单：
$ npm install typescript-require --save-dev
$ mocha --compilers ts:typescript-require
回答by ToDevAndBeyond
Using the latest version of Mochaand ts-nodeI was getting an Unexpected tokenimport issue. Using the below settings with ts-mochaworked for me:
使用最新版本的Mocha和ts-node，我遇到了意外的令牌导入问题。在ts-mocha 中使用以下设置对我有用：
tsconfig.json
配置文件
{
"files": [
"src/main.ts"
],
"compilerOptions": {
"noImplicitAny": true,
"target": "es2015",
"types": ["mocha"],
"module": "commonjs"
}
}
package.json
包.json
"scripts": {
"mocha": "ts-mocha -p library/tsconfig.json library/test/**/*.ts"
},
launch.json
启动文件
{
"type": "node",
"request": "launch",
"name": "Mocha Tests",
"runtimeArgs": [
"${workspaceFolder}/node_modules/ts-mocha/bin/ts-mocha",
"--timeout", "999999",
"-p",
"${workspaceFolder}/library/tsconfig.json",
"${workspaceFolder}/library/test/**/*.ts"
],
"internalConsoleOptions": "openOnSessionStart"
}
and gulp.js just incase you want to use gulp too
和 gulp.js 以防万一你也想使用 gulp
const gulp = require('gulp');
const ts = require('gulp-typescript');
const mocha = require('gulp-mocha');
const tsProject = ts.createProject('tsconfig.json');
gulp.task('build', () => tsProject.src()
.pipe(tsProject())
.js.pipe(gulp.dest('dist')));
gulp.task('test', () => gulp.src('test/*.spec.ts')
.pipe(mocha({
reporter: 'nyan',
require: ['ts-node/register'],
})));
/* single command to hook into VS Code */
gulp.task('default', gulp.series('build', 'test'));
