Fix DataUriSource description to include "data:" prefix

[sokra]

What?

Fix the description() method of DataUriSource in Turbopack to include the full data: URI prefix in the display string.

Before: data URI content (svg+xml;charset=utf8,...)
After: data URI content (data:svg+xml;charset=utf8,...)

Why?

The previous implementation only included the raw data content starting from the media type, omitting the data: scheme prefix. This made the description string look malformed and not recognizable as a data URI — especially in error messages where this description is shown to developers.

The fix reconstructs the proper data URI format (data:<media_type>[;<encoding>],<data>) before truncating it to 50 characters, so the displayed prefix is a valid (partial) data URI that developers can recognize and understand.

How?

In turbopack/crates/turbopack-core/src/data_uri_source.rs, the description() function now builds the full data URI string first (data:{media_type}{sep}{encoding},{data}), then takes the first 50 characters of that. This ensures the data: scheme prefix is always present in the truncated display.

Closes NEXT-

[nextjs-bot]

Tests Passed

[codspeed-hq]

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing claude/test-webpack-loader-errors-DJdPW (e308481) with canary (261922d)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[lukesandberg]

@lukesandberg approved this PR from Slack with Graphite

[mischnic]

Merge activity

• Mar 17, 9:25 AM UTC: @mischnic merged this pull request with Graphite.