markcellus / markcellus/html-express-js

ERR_UNSUPPORTED_ESM_URL_SCHEME on Windows

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Merged PRs (30d)
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Description

Hi,

I was getting the below error on my Windows machine.

node:internal/errors:484
    ErrorCaptureStackTrace(err);
    ^

Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]: Only URLs with a scheme in: file, data are supported by the default ESM loader. On Windows, absolute paths must be valid file:// URLs. Received protocol 'c:'
    at new NodeError (node:internal/errors:393:5)
    at throwIfUnsupportedURLScheme (node:internal/modules/esm/resolve:989:11)
    at defaultResolve (node:internal/modules/esm/resolve:1069:3)
    at nextResolve (node:internal/modules/esm/loader:161:28)
    at ESMLoader.resolve (node:internal/modules/esm/loader:831:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:413:18)
    at ESMLoader.import (node:internal/modules/esm/loader:514:22)
    at importModuleDynamically (node:internal/modules/esm/translators:110:35)
    at importModuleDynamicallyCallback (node:internal/process/esm_loader:36:14)
    at renderHtmlFileTemplate (file:///C:/Users/***/OneDrive/Desktop/workspace/testServer/node_modules/html-express-js/src/index.js:21:20) {
  code: 'ERR_UNSUPPORTED_ESM_URL_SCHEME'
}

Node.js v19.2.0

Here is the diff that solved my problem:

diff --git a/node_modules/html-express-js/src/index.js b/node_modules/html-express-js/src/index.js
index 9d06c5c..954db82 100644
--- a/node_modules/html-express-js/src/index.js
+++ b/node_modules/html-express-js/src/index.js
@@ -15,6 +15,9 @@ const glob = promisify(g);
  * @returns {Promise<string>} HTML
  */
 async function renderHtmlFileTemplate(path, data, state) {
+  if(!path.startsWith('file:///')) {
+    path = 'file:///'+path;
+  }
   const { view } = await import(path);
   const rendered = view(data, state);
   let html = '';

This issue body was partially generated by patch-package.

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Research direction

Start in src/index.js at renderHtmlFileTemplate, identified by the Windows stack trace, and inspect how its dynamic import receives paths. Reproduce the failure on Windows with an absolute path, then verify that the template renders successfully through the supported URL handling. The issue's supplied diff provides the reported expected direction.

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Assessment

Tech stack
javascript, node.js
Domain
backend
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
45/100

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