Nunjucks: Exceptions being swallowed after import errors in included templates

[leosdad]

As stated in topic #1127, there are still problems with exceptions not being thrown in certain cases. I found out that if some problem happens with import errors inside included templates, Nunjucks will fail to generate the required exceptions. For example, create a template included.njk:

{% import 'unknown.njk' as nothing %}
String is {{ str | whatever }}

and the following script:

const path = 'C:/users/etc/thispath';
const nunjucks = require("nunjucks");
nunjucks.configure(path);
console.log(nunjucks.renderString("{% include 'included.njk' %}", { str: 'okay' }));

Nunjucks silently outputs a null string. Some notes:

• The exception is captured correctly if the contents of the njk file are directly used as the template.
• The exception is also captured if the line with import is removed from the njk file.

I hope this is clear. Thanks in advance!

[leosdad]

(bump)

Any news? TIA

[leosdad]

Hi again,

Any prospects on this problem?

[MH15]

This is quite the issue would be interested in some guidance.

[leosdad]

Thanks for your attention. A minimal test case would be as follows.

1. Create a file named _test.js_ with:

const nunjucks = require('nunjucks');
console.log(nunjucks.renderString('{% include "included.njk" %}', { str: 'okay' }));

1. Create a file named _included.njk_:

String is {{ str }}

1. Run the script test.js. You will get 'String is okay' as expected.

2. Now, edit _included.njk_ so as to import a nonexistent file:

{% import 'unknown.njk' as dummy %}
String is {{ str }}

1. Run test.js again. You will get 'null' as the result. I'd expect an exception instead, saying that _unknown.njk_ was not found or a similar error.

I hope it's clearer now!

[MH15]

Oh my bad! I'm experiencing the same error! Sorry for that confusion, was hoping someone could help me (us) figure that out.

[fdintino]

I'm looking into this

[MH15]

Appreciate it! Will test.