CLI.ValueSources is declared by both cli tag and…

Error message

CLI.ValueSources is declared by both cli tag and InputField.CLI

What it means

Value sources (flag/file/stdin) were declared both in the cli tag and in InputField.CLI.ValueSources. The compiler rejects the double declaration because sources determine accepted input channels and must be unambiguous.

Solutions

Remove the sources= entry from the cli tag and keep InputField.CLI.ValueSources.
Or drop InputField.CLI.ValueSources if the tag already declares the sources.

Example fix

// before
Data string `flag:"data" cli:"sources=flag,file"` + InputField{CLI: CLI{ValueSources: [...]}}
// after
Data string `flag:"data"` + InputField{CLI: CLI{ValueSources: [...]}}

Defensive patterns

Strategy: validation

Validate before calling

for _, f := range fields {
    if len(f.TagSources) > 0 && len(f.InputSources) > 0 {
        return fmt.Errorf("flag %s: value sources declared twice", f.Name)
    }
}

Prevention

Declare value sources in only one channel; prefer InputField.CLI.ValueSources for programmatic control.
Search for sources= in struct tags before adding ValueSources supplements.

When it happens

Trigger: compileInput -> mergeInputSupplement when len(supplement.CLI.ValueSources) > 0 and len(field.cli.ValueSources) > 0 (parsed from cli tag, e.g. cli:"sources=flag,file").

Common situations: Adding programmatic ValueSources to a field whose cli tag already lists sources, typically during incremental migration from tags to InputField definitions.

Related errors

AI-assisted analysis of larksuite/cli@7fd6ef3c07 (2026-09-04). Data as JSON: /api/errors/aa9166df03e93a79. Report an issue: GitHub.

Appendix: source

Thrown at shortcuts/common/typed_compile_args.go:244

	}
	if supplement.Default.Set {
		if field.defaultValue.Set {
			return fmt.Errorf("default is declared by both schema and InputField.Default")
		}
		if field.required {
			return fmt.Errorf("required input cannot declare a default")
		}
		field.defaultValue = supplement.Default
	}
	if len(supplement.CLI.Aliases) > 0 {
		if len(field.cli.Aliases) > 0 {
			return fmt.Errorf("CLI.Aliases is declared by both cli tag and InputField.CLI")
		}
		field.cli.Aliases = append([]typedFlagAlias(nil), supplement.CLI.Aliases...)
	}
	if len(supplement.CLI.ValueSources) > 0 {
		if len(field.cli.ValueSources) > 0 {
			return fmt.Errorf("CLI.ValueSources is declared by both cli tag and InputField.CLI")
		}
		field.cli.ValueSources = append([]typedValueSource(nil), supplement.CLI.ValueSources...)
	}
	if supplement.CLI.Encoding != "" {
		if field.cli.Encoding != "" {
			return fmt.Errorf("CLI.Encoding is declared by both cli tag and InputField.CLI")
		}
		field.cli.Encoding = supplement.CLI.Encoding
	}
	if supplement.CLI.Hidden {
		if field.cli.Hidden {
			return fmt.Errorf("CLI.Hidden is declared twice")
		}
		field.cli.Hidden = true
	}
	if supplement.CLI.Deprecated != "" {
		if field.cli.Deprecated != "" {
			return fmt.Errorf("CLI.Deprecated is declared twice")

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