Lingui v5 preview - issues with multiline messages

[AndrewIngram]

We have some messages using the msg macro that are multiline, eg:

        <SomeComponent
          description={_(msg`Learn about the four key steps of building a top-tier corporate
          sustainability program for tackling climate change: measuring
          emissions, reducing them with initiatives, achieving net zero, and
          reporting progress.`)}
        />

(note the indentation)

In Lingui 4, this gets extracted as:

#: components/home/KickoffCard.tsx:116
msgid ""
"Learn about the four key steps of building a top-tier corporate\n"
"sustainability program for tackling climate change: measuring\n"
"emissions, reducing them with initiatives, achieving net zero, and\n"
"reporting progress."
msgstr ""
"Learn about the four key steps of building a top-tier corporate\n"
"sustainability program for tackling climate change: measuring\n"
"emissions, reducing them with initiatives, achieving net zero, and\n"
"reporting progress."

With a generated ID of N0eok2

However, with Lingui 5 it gets extracted as:

#: components/home/KickoffCard.tsx:116
msgid ""
"Learn about the four key steps of building a top-tier corporate\n"
"          sustainability program for tackling climate change: measuring\n"
"          emissions, reducing them with initiatives, achieving net zero, and\n"
"          reporting progress."

With a generated ID of omQrF1.

When we attempt to load the message at runtime (we're using the swc plugin) it's using the ID N0eok2 (matching the v4 extracted message). The dedentation is desirable, so I think the v4 behaviour is most correct?

[timofei-iatsenko]

The v5 behavior is correct. All indentation / whitespaces are left as-is without any cleaning. V4 version of swc plugin has v4 behavior of whitespace cleaning, so you will have mismatch during runtime/extraction.

This change is ported to swc plugin, but it's not released yet. I asked @andrii-bodnar to make a pre-release of lingui swc plugin.

References:
#1897
#1882

[AndrewIngram]

Yeah, we're using the swc plugin. I'll try that out when the pre-release is out.

[timofei-iatsenko]

https://www.npmjs.com/package/@lingui/swc-plugin/v/5.0.0-next.0