d2lang/d2 · critical

Failed to decompress SourceSansPro-Italic: %v

Error message

Failed to decompress SourceSansPro-Italic: %v

What it means

init()-time panic in the wasm d2fonts package when the embedded brotli-compressed SourceSansPro Italic font fails to decompress. Registration into FontEncodings never happens and the whole module fails to initialize.

Source

Thrown at d2renderers/d2fonts/d2fonts_embed_wasm.go:73

		panic(fmt.Sprintf("Failed to decompress SourceSansPro-Regular: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceSansPro, Style: FONT_STYLE_REGULAR}, str)
	}

	if str, err := compression.DecompressBrotli(sourceSansProBoldBr); err != nil {
		panic(fmt.Sprintf("Failed to decompress SourceSansPro-Bold: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceSansPro, Style: FONT_STYLE_BOLD}, str)
	}

	if str, err := compression.DecompressBrotli(sourceSansProSemiboldBr); err != nil {
		panic(fmt.Sprintf("Failed to decompress SourceSansPro-Semibold: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceSansPro, Style: FONT_STYLE_SEMIBOLD}, str)
	}

	if str, err := compression.DecompressBrotli(sourceSansProItalicBr); err != nil {
		panic(fmt.Sprintf("Failed to decompress SourceSansPro-Italic: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceSansPro, Style: FONT_STYLE_ITALIC}, str)
	}

	// Decompress and register SourceCodePro fonts
	if str, err := compression.DecompressBrotli(sourceCodeProRegularBr); err != nil {
		panic(fmt.Sprintf("Failed to decompress SourceCodePro-Regular: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceCodePro, Style: FONT_STYLE_REGULAR}, str)
	}

	if str, err := compression.DecompressBrotli(sourceCodeProBoldBr); err != nil {
		panic(fmt.Sprintf("Failed to decompress SourceCodePro-Bold: %v", err))
	} else {
		FontEncodings.Set(Font{Family: SourceCodePro, Style: FONT_STYLE_BOLD}, str)
	}

	if str, err := compression.DecompressBrotli(sourceCodeProSemiboldBr); err != nil {

View on GitHub (pinned to 0d69dca6f5)

Solutions

1. Test sourceSansProItalicBr with a standalone brotli decompressor
2. Regenerate the italic .br asset from the original TTF
3. Rebuild the wasm artifact from a clean checkout
4. Compare embedded bytes against upstream d2 to spot corruption

if _, err := compression.DecompressBrotli(sourceSansProItalicBr); err != nil {
    return fmt.Errorf("broken embedded SourceSansPro-Italic asset: %w", err)
}

When it happens

Trigger: Package init of the wasm build when compression.DecompressBrotli(sourceSansProItalicBr) errors — corrupt or invalid embedded brotli bytes.

Common situations: Broken build artifacts; incomplete embed (go:embed missing file replaced by placeholder); incompatible brotli compression settings when regenerating assets.

Related errors

• Failed to decompress SourceSansPro-Regular: %v
• Failed to decompress SourceSansPro-Bold: %v
• Failed to decompress SourceSansPro-Semibold: %v
• Failed to decompress SourceCodePro-Regular: %v
• Failed to decompress SourceCodePro-Bold: %v

AI-assisted analysis of d2lang/d2@0d69dca6f5 (2026-08-31). Data as JSON: /api/errors/c83b9be17597612b. Report an issue: GitHub.