microsoft/typescript-go · error

failed to marshal legend file: %w

Error message

failed to marshal legend file: %w

What it means

Error "failed to marshal legend file: %w" thrown in microsoft/typescript-go.

Source

Thrown at internal/tracing/tracing.go:475

		}
		// Flush any remaining buffered content and close the JSON array.
		if err := tr.fs.AppendFile(tr.tracePath, tr.traceContent.String()+"\n]\n"); err != nil {
			return fmt.Errorf("failed to write trace file: %w", err)
		}
		tr.traceContent.Reset()
		tr.traceStarted.Store(false)
	}

	// Sort legend entries by typesPath for deterministic output
	slices.SortFunc(tr.legend, func(a, b TraceRecord) int {
		return strings.Compare(a.TypesPath, b.TypesPath)
	})

	// Write the legend file
	legendPath := tspath.CombinePaths(tr.traceDir, "legend.json")
	legendData, err := json.MarshalIndent(tr.legend, "", "  ")
	if err != nil {
		return fmt.Errorf("failed to marshal legend file: %w", err)
	}
	if err := tr.fs.WriteFile(legendPath, string(legendData)); err != nil {
		return fmt.Errorf("failed to write legend file: %w", err)
	}

	return nil
}

// typeTracer is the per-checker tracer implementation
type typeTracer struct {
	fs           vfs.FS
	checkerIndex int
	typesPath    string
	types        []TracedType
	mu           sync.Mutex
}

func (t *typeTracer) RecordType(typ TracedType) {

View on GitHub (pinned to 1bcfa18d79)

When it happens

Trigger: Thrown at internal/tracing/tracing.go:475 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/typescript-go@1bcfa18d79 (2026-08-16). Data as JSON: /api/errors/3a3c5a9de8297003. Report an issue: GitHub.