/**
 * The one rule for "is this name a component?"
 *
 * An optional SINGLE leading underscore, then a capital letter, then letters,
 * digits and underscores. The underscore prefix is a namespace reserved for
 * framework-provided components (`_Root_Layout`) so they cannot collide with
 * application components. Two or more leading underscores are not a component
 * name; a lower-case first letter after the optional underscore is an HTML tag.
 */
export declare const COMPONENT_NAME_PATTERN: RegExp;
export declare const COMPONENT_NAME_RULE = "must start with a capital letter, optionally preceded by a single underscore";
export declare function is_component_name(name: string): boolean;
/**
 * The render-time check behind <{expression}>: the expression must evaluate
 * to a component name string that a literal tag would accept - no more, no
 * less. A valid name that names nothing renders the ordinary placeholder
 * component, exactly as an undefined literal tag does.
 */
export declare function dynamic_component_name(value: unknown): string;
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