Error "Must use import to load ES Module" when using es6 modules

I get the error

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: C:\Program Files\iisnode\www\es6module\runner.mjs

when I run the example below under iisnode:

hi.mjs:

export function sayHi(name) {
    return "Hi, " + name + "!"
}

runner.mjs:

import { sayHi } from './hi.mjs'
console.log(sayHi('LogRocket'))

It all works as expected when run with
node runner.mjs
(node 13.8.0), however under iisnode I get the error above.

Here is my web.config for reference:

<configuration>
  <system.webServer>

    <handlers>
      <add name="iisnode" path="runner.mjs" verb="*" modules="iisnode" />
    </handlers>

    <iisnode
      nodeProcessCommandLine="&quot;%programfiles%\nodejs\node.exe&quot;"
      interceptor="&quot;%programfiles%\iisnode\interceptor.js&quot;" />

  </system.webServer>
</configuration>

Having this problem as well.

I managed to fix this issue by using the esm module. I created a server.js file which I reference from the web.config like this:

require = require("esm")(module/*, options*/);
module.exports = require("./app.js");

In this example app.js is an ES module.

Patrick Galbraith (@patrickgalbraith)

Patrick Galbraith (@patrickgalbraith)
I'm still getting the following exception:

Application has thrown an uncaught exception and is terminated:
Error: Cannot find module 'esm'
Require stack:
- D:\wwwroot\sites\...\server.js
- C:\Program Files\iisnode\interceptor.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1039:15)
    at Module._load (node:internal/modules/cjs/loader:885:27)
    at Module.require (node:internal/modules/cjs/loader:1105:19)
    at require (node:internal/modules/cjs/helpers:103:18)
    at Object.<anonymous> (D:\wwwroot\sites\IFJ-Levante-App2\server.js:1:11)
    at Module._compile (node:internal/modules/cjs/loader:1218:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1272:10)
    at Module.load (node:internal/modules/cjs/loader:1081:32)
    at Module._load (node:internal/modules/cjs/loader:922:12)
    at Module.require (node:internal/modules/cjs/loader:1105:19)

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Error "Must use import to load ES Module" when using es6 modules #90

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Error "Must use import to load ES Module" when using es6 modules #90

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patrickgalbraith commented on Dec 9, 2020

patrickgalbraith commented on Dec 10, 2020

Ben555555 commented on Nov 20, 2024

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