encountered an error while interpreting Parser options; reas

Error message

encountered an error while interpreting Parser options; reason: %w

What it means

Error "encountered an error while interpreting Parser options; reason: %w" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/experimental/csv/module.go:181

	if common.IsNullish(fileArg) {
		common.Throw(rt, fmt.Errorf("csv Parser constructor takes at least one non-nil source argument"))
	}

	// 1. Make sure the Sobek object is a fs.File (Sobek operation)
	var file fs.File
	if err := mi.vu.Runtime().ExportTo(fileArg, &file); err != nil {
		common.Throw(
			mi.vu.Runtime(),
			fmt.Errorf("first argument expected to be a fs.File instance, got %T instead", call.Argument(0)),
		)
	}

	options := newDefaultParserOptions()
	if len(call.Arguments) == 2 && !sobek.IsUndefined(call.Argument(1)) {
		var err error
		options, err = newParserOptionsFrom(call.Argument(1).ToObject(rt))
		if err != nil {
			common.Throw(rt, fmt.Errorf("encountered an error while interpreting Parser options; reason: %w", err))
		}
	}

	// Instantiate and configure a csv reader using the provided file and options
	r, err := NewReaderFrom(file.ReadSeekStater, options)
	if err != nil {
		common.Throw(rt, fmt.Errorf("failed to create a new parser; reason: %w", err))
	}

	// Create a new Parser instance
	parser := Parser{
		reader:  r,
		options: options,
		vu:      mi.vu,
	}

	return rt.ToValue(&parser).ToObject(rt)
}

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/experimental/csv/module.go:181 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/f90d20d3ace3e0a6. Report an issue: GitHub.