/**
 * A {@link Span} is a range of text within a source file, represented
 * by two numbers, a `start` and `end` character position.
 */
export declare type Span = [
    /**
     * Character position where this span starts.
     */
    start: number,
    /**
     * Character position where this span ends.
     */
    end: number
];
/**
 * Determines if {@link a} is a {@link Span}.
 */
export declare function isSpan(a: any): a is Span;
export declare function emptySpan(): Span;
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