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import { Token } from './ast.d.ts';import { Source } from './source.d.ts';
/** * Given a Source object, this returns a Lexer for that source. * A Lexer is a stateful stream generator in that every time * it is advanced, it returns the next token in the Source. Assuming the * source lexes, the final Token emitted by the lexer will be of kind * EOF, after which the lexer will repeatedly return the same EOF token * whenever called. */export class Lexer {  source: Source;
  /**   * The previously focused non-ignored token.   */  lastToken: Token;
  /**   * The currently focused non-ignored token.   */  token: Token;
  /**   * The (1-indexed) line containing the current token.   */  line: number;
  /**   * The character offset at which the current line begins.   */  lineStart: number;
  constructor(source: Source);
  /**   * Advances the token stream to the next non-ignored token.   */  advance(): Token;
  /**   * Looks ahead and returns the next non-ignored token, but does not change   * the state of Lexer.   */  lookahead(): Token;}
/** * @internal */export function isPunctuatorToken(token: Token): boolean;