d2lang/d2 · critical

Failed to decompress SourceSansPro-Bold: %v

Error message

Failed to decompress SourceSansPro-Bold: %v

What it means

Same init()-time brotli decompression as the other embedded fonts, but for the SourceSansPro Bold face. A failed DecompressBrotli on the embedded bold font blob panics during package initialization. Cause is a corrupt/mismatched embedded asset in the wasm build.

Source

Thrown at d2renderers/d2fonts/d2fonts_embed_wasm.go:61

//go:embed encoded/FuzzyBubbles-Bold.txt.br
var fuzzyBubblesBoldBr []byte

//go:embed ttf/*
var fontFacesFS embed.FS

func init() {
	FontEncodings = syncmap.New[Font, string]()

	// Decompress and register SourceSansPro fonts
	if str, err := compression.DecompressBrotli(sourceSansProRegularBr); err != nil {
		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 {

View on GitHub (pinned to 0d69dca6f5)

Solutions

1. Verify and regenerate sourceSansProBoldBr (test decompression standalone)
2. Re-run the project's font embedding/wasm build script from a clean checkout
3. Confirm the brotli library version used at compression matches the decompressor
4. Replace the asset from upstream if only this file is broken

Example fix

null

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

When it happens

Trigger: Package init of the wasm d2fonts build when sourceSansProBoldBr fails to decompress; occurs at wasm instantiation/load, before any rendering call.

Common situations: Regenerating font .br files with an incompatible brotli version; build pipeline embedding truncated or stale assets; editing embedded blobs by hand.

Related errors

• Failed to decompress SourceSansPro-Regular: %v
• Failed to decompress SourceSansPro-Semibold: %v
• Failed to decompress SourceSansPro-Italic: %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/edd93697aa389ef1. Report an issue: GitHub.