Module transform causes errors

[henrywoody]

Describe the bug

I have an external package called @hex-insights/log, when I import this package and try to instantiate any class in my app using vitest I encounter the error (works fine with just vite for dev server or build):

 FAIL  src/Components/GlobalErrorBoundary/test.tsx > GlobalErrorBoundary > Logger Test > should instantiate Logger
TypeError: Cannot call a class as a function
 ❯ d ../../node_modules/@hex-insights/log/dist/index.js:2:7764

 ❯ new t ../../node_modules/@hex-insights/log/dist/index.js:2:14712
 ❯ src/Components/GlobalErrorBoundary/test.tsx:44:21

Here is the source from the log package:

export class ASmallClass {
	private secret = "I am a secret";
}

and in my test I have:

describe("Logger Test", () => {
	it("should instantiate Logger", () => {
		const myLogger = new ASmallClass();
		expect(myLogger).toBeDefined();
	});
});

Here is my vitest.config.ts file:

/// <reference types="vitest" />
import { defineConfig } from "vite";
import tsconfigPaths from "vite-tsconfig-paths";
import react from "@vitejs/plugin-react";

export default defineConfig({
	plugins: [tsconfigPaths(), react()],
	test: {
		include: ["**/__tests__/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)", "**/test.[jt]s?(x)"],
		environment: "jsdom",
		server: {
			debug: {
				dumpModules: true,
			},
		},
		css: {
			modules: {
				classNameStrategy: "non-scoped",
			},
		},
	},
});

I've done some digging and found the issue has to do with the way vitest transforms modules.

Here is the original package from node_modules:

import{getObjectKeys as t,isString as e,isObject as r,isArray as n,isNumber as i,isBoolean as o,getObjectEntries as a,sleep as u,deepCopyObject as c}from"@hex-insights/core";var s,l;function f(t,e){var r=Object.keys(t);if(Object.getOwnPropertySymbols){var n=Object.getOwnPropertySymbols(t);e&&(n=n.filter((function(e){return Object.getOwnPropertyDescriptor(t,e).enumerable}))),r.push.apply(r,n)}return r}function h(t){for(var e=1;e<arguments.length;e++){var r=null!=arguments[e]?arguments[e]:{};e%2?f(Object(r),!0).forEach((function(e){b(t,e,r[e])})):Object.getOwnPropertyDescriptors?Object.defineProperties(t,Object.getOwnPropertyDescriptors(r)):f(Object(r)).forEach((function(e){Object.defineProperty(t,e,Object.getOwnPropertyDescriptor(r,e))}))}return t}function v(){v=function(){return e};var t,e={},r=Object.prototype,n=r.hasOwnProperty,i=Object.defineProperty||function(t,e,r){t[e]=r.value},o="function"==typeof Symbol?Symbol:{},a=o.iterator||"@@iterator",u=o.asyncIterator||"@@asyncIterator",c=o.toStringTag||"@@toStringTag";function s(t,e,r){return Object.defineProperty(t,e,{value:r,enumerable:!0,configurable:!0,writable:!0}),t[e]}try{s({},"")}catch(t){s=function(t,e,r){return t[e]=r}}function l(t,e,r,n){var o=e&&e.prototype instanceof d?e:d,a=Object.create(o.prototype),u=new P(n||[]);return i(a,"_invoke",{value:j(t,r,u)}),a}function f(t,e,r){try{return{type:"normal",arg:t.call(e,r)}}catch(t){return{type:"throw",arg:t}}}e.wrap=l;var h="suspendedStart",p="executing",y="completed",g={};function d(){}function m(){}function w(){}var b={};s(b,a,(function(){return this}));var k=Object.getPrototypeOf,x=k&&k(k(I([])));x&&x!==r&&n.call(x,a)&&(b=x);var O=w.prototype=d.prototype=Object.create(b);function E(t){["next","throw","return"].forEach((function(e){s(t,e,(function(t){return this._invoke(e,t)}))}))}function L(t,e){function r(i,o,a,u){var c=f(t[i],t,o);if("throw"!==c.type){var 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And here is the version that vitest uses (received from the output of test.server.debug.dumpModules: true:

// /<path>/frontend/node_modules/@hex-insights/log/dist/index.js
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Object.defineProperty(__vite_ssr_exports__, "setLevel", { enumerable: true, configurable: true, get(){ return _ }});
Object.defineProperty(__vite_ssr_exports__, "setOutput", { enumerable: true, configurable: true, get(){ return W }});
Object.defineProperty(__vite_ssr_exports__, "warn", { enumerable: true, configurable: true, get(){ return B }});
Object.defineProperty(__vite_ssr_exports__, "withField", { enumerable: true, configurable: true, get(){ return R }});
Object.defineProperty(__vite_ssr_exports__, "withFields", { enumerable: true, configurable: true, get(){ return J }});
Object.defineProperty(__vite_ssr_exports__, "writerFunc", { enumerable: true, configurable: true, get(){ return Z }});

That's a lot of minified code, so here are the important parts:

I'm dealing with the ASmallClass class, which is defined as tt and looks like this originally:

var tt=w((function t(){d(this,t),this.secret="I am a secret"}))

but from the vitest transformed version looks like this:

var tt=w((function t(){d(this,__vite_ssr_import_0__.getObjectKeys),this.secret="I am a secret"}))

Where d is (the thrower of the error):

function d(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}

Now, at the top of the original file I have:

import{getObjectKeys as t, ...}

So my guess is that vitest is incorrectly replacing all t variables with __vite_ssr_import_0__.getObjectKeys even though in this case t should clearly be the locally defined t function.

How can I fix this issue? Is it possible to disable the module transform? Is it possible to have the module transform work correctly?

Reproduction

It's hard to provide a reproduction because these packages are private and owned by my company.

System Info

System:
    OS: macOS 13.3.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 70.11 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.11.0 - /opt/homebrew/opt/node@20/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 10.2.4 - /opt/homebrew/opt/node@20/bin/npm
  Browsers:
    Chrome: 123.0.6312.124
    Safari: 16.4

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
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• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sheremet-va]

This is a very good reproduction. I would suggest opening an issue in Vite repo as it is them who transform files, - looks like this is a bug in SSR transform pipeline somewhere.

[henrywoody]

Will do, thanks @sheremet-va