run formatting

src/attacks.ts

@@ -59,9 +59,12 @@ const KNIGHT_ATTACKS: BySquare<SquareSet> = tabulate(sq => computeRange(sq, [-17
 
 /**
  * A pre-computed table of pawn attacks for each square on the chessboard, separated by color.
- * @type {{ white: BySquare<SquareSet>, black: BySquare<SquareSet> }}
+ * @type {{ white: BySquare<SquareSet>; black: BySquare<SquareSet> }}
  */
-const PAWN_ATTACKS: { white: BySquare<SquareSet>, black: BySquare<SquareSet> } = {
+const PAWN_ATTACKS: {
+ white: BySquare<SquareSet>;
+ black: BySquare<SquareSet>;
+} = {
  white: tabulate(sq => computeRange(sq, [7, 9])),
  black: tabulate(sq => computeRange(sq, [-7, -9])),
 };
@@ -88,7 +91,6 @@ export const knightAttacks = (square: Square): SquareSet => KNIGHT_ATTACKS[squar
  */
 export const pawnAttacks = (color: Color, square: Square): SquareSet => PAWN_ATTACKS[color][square];
 
-
 /**
  * A pre-computed table of file ranges for each square on the chessboard.
  */
@@ -249,4 +251,4 @@ export const ray = (a: Square, b: Square): SquareSet => {
 export const between = (a: Square, b: Square): SquareSet =>
  ray(a, b)
  .intersect(SquareSet.full().shl64(a).xor(SquareSet.full().shl64(b)))
- .withoutFirst();
+ .withoutFirst();

src/board.ts

@@ -41,7 +41,7 @@ export class Board implements Iterable<[Square, Piece]>, ByRole<SquareSet>, ByCo
  /** @type {SquareSet} */
  king: SquareSet;
 
- private constructor() { }
+ private constructor() {}
 
  /**
  * Creates a new board with the default starting position for standard chess.
@@ -233,4 +233,4 @@ export class Board implements Iterable<[Square, Piece]>, ByRole<SquareSet>, ByCo
 export const boardEquals = (left: Board, right: Board): boolean =>
  left.white.equals(right.white)
  && left.promoted.equals(right.promoted)
- && ROLES.every(role => left[role].equals(right[role]));
+ && ROLES.every(role => left[role].equals(right[role]));

src/chess.ts

@@ -47,7 +47,7 @@ export enum IllegalSetup {
  * Custom error class for position errors.
  * @extends Error
  */
-export class PositionError extends Error { }
+export class PositionError extends Error {}
 
 /**
  * Calculates the attacking squares for a given square and attacker color.
@@ -67,10 +67,9 @@ const attacksTo = (square: Square, attacker: Color, board: Board, occupied: Squa
  .union(pawnAttacks(opposite(attacker), square).intersect(board.pawn)),
  );
 
-
 /**
-* Represents the castling rights and related information for a chess position.
-*/
+ * Represents the castling rights and related information for a chess position.
+ */
 export class Castles {
  /**
  * The castling rights as a set of squares.
@@ -94,7 +93,7 @@ export class Castles {
  * Creates a new instance of the Castles class.
  * @private
  */
- private constructor() { }
+ private constructor() {}
 
  /**
  * Returns the default castling rights and setup.
@@ -306,7 +305,7 @@ export abstract class Position {
  */
  fullmoves: number;
 
- protected constructor(readonly rules: Rules) { }
+ protected constructor(readonly rules: Rules) {}
 
  /**
  * Resets the position to the starting position.
@@ -445,20 +444,20 @@ export abstract class Position {
  }
 
  /**
- * Calculates the possible destination squares for a drop move.
- * @param {Context} [_ctx] The optional context for the move generation.
- * @returns {SquareSet} The set of possible destination squares for a drop move.
- */
+  * Calculates the possible destination squares for a drop move.
+  * @param {Context} [_ctx] The optional context for the move generation.
+  * @returns {SquareSet} The set of possible destination squares for a drop move.
+  */
  dropDests(_ctx?: Context): SquareSet {
  return SquareSet.empty();
  }
 
  /**
- * Calculates the possible destination squares for a piece on a given square.
- * @param {Square} square The square of the piece.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {SquareSet} The set of possible destination squares.
- */
+  * Calculates the possible destination squares for a piece on a given square.
+  * @param {Square} square The square of the piece.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {SquareSet} The set of possible destination squares.
+  */
  dests(square: Square, ctx?: Context): SquareSet {
  ctx = ctx || this.ctx();
  if (ctx.variantEnd) return SquareSet.empty();
@@ -520,10 +519,10 @@ export abstract class Position {
  }
 
  /**
- * Determines the outcome of the variant.
- * @param {Context} [_ctx] The optional context for the position.
- * @returns {Outcome | undefined} `undefined` by default. Subclasses can override this method.
- */
+  * Determines the outcome of the variant.
+  * @param {Context} [_ctx] The optional context for the position.
+  * @returns {Outcome | undefined} `undefined` by default. Subclasses can override this method.
+  */
  variantOutcome(_ctx?: Context): Outcome | undefined {
  return;
  }
@@ -577,10 +576,10 @@ export abstract class Position {
  }
 
  /**
- * Checks if there are any possible destination squares for the current player's moves.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {boolean} `true` if there are possible destination squares, `false` otherwise.
- */
+  * Checks if there are any possible destination squares for the current player's moves.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {boolean} `true` if there are possible destination squares, `false` otherwise.
+  */
  hasDests(ctx?: Context): boolean {
  ctx = ctx || this.ctx();
  for (const square of this.board[this.turn]) {
@@ -589,11 +588,11 @@ export abstract class Position {
  return this.dropDests(ctx).nonEmpty();
  }
  /**
- * Checks if a given move is legal in the current position.
- * @param {Move} move The move to check for legality.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {boolean} `true` if the move is legal, `false` otherwise.
- */
+  * Checks if a given move is legal in the current position.
+  * @param {Move} move The move to check for legality.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {boolean} `true` if the move is legal, `false` otherwise.
+  */
  isLegal(move: Move, ctx?: Context): boolean {
  if (isDrop(move)) {
  if (!this.pockets || this.pockets[this.turn][move.role] <= 0) return false;
@@ -609,49 +608,49 @@ export abstract class Position {
  }
 
  /**
- * Checks if the current position is a check.
- * @returns {boolean} `true` if the current position is a check, `false` otherwise.
- */
+  * Checks if the current position is a check.
+  * @returns {boolean} `true` if the current position is a check, `false` otherwise.
+  */
  isCheck(): boolean {
  const king = this.board.kingOf(this.turn);
  return defined(king) && this.kingAttackers(king, opposite(this.turn), this.board.occupied).nonEmpty();
  }
 
  /**
- * Checks if the current position is an end position.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {boolean} `true` if the current position is an end position, `false` otherwise.
- */
+  * Checks if the current position is an end position.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {boolean} `true` if the current position is an end position, `false` otherwise.
+  */
  isEnd(ctx?: Context): boolean {
  if (ctx ? ctx.variantEnd : this.isVariantEnd()) return true;
  return this.isInsufficientMaterial() || !this.hasDests(ctx);
  }
 
  /**
- * Checks if the current position is a checkmate.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {boolean} `true` if the current position is a checkmate, `false` otherwise.
- */
+  * Checks if the current position is a checkmate.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {boolean} `true` if the current position is a checkmate, `false` otherwise.
+  */
  isCheckmate(ctx?: Context): boolean {
  ctx = ctx || this.ctx();
  return !ctx.variantEnd && ctx.checkers.nonEmpty() && !this.hasDests(ctx);
  }
 
  /**
- * Checks if the current position is a stalemate.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {boolean} `true` if the current position is a stalemate, `false` otherwise.
- */
+  * Checks if the current position is a stalemate.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {boolean} `true` if the current position is a stalemate, `false` otherwise.
+  */
  isStalemate(ctx?: Context): boolean {
  ctx = ctx || this.ctx();
  return !ctx.variantEnd && ctx.checkers.isEmpty() && !this.hasDests(ctx);
  }
 
  /**
- * Determines the outcome of the current position.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {Outcome | undefined} The outcome of the current position, or undefined if the position is not an end position.
- */
+  * Determines the outcome of the current position.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {Outcome | undefined} The outcome of the current position, or undefined if the position is not an end position.
+  */
  outcome(ctx?: Context): Outcome | undefined {
  const variantOutcome = this.variantOutcome(ctx);
  if (variantOutcome) return variantOutcome;
@@ -662,10 +661,10 @@ export abstract class Position {
  }
 
  /**
- * Calculates all possible destination squares for each piece of the current player.
- * @param {Context} [ctx] The optional context for the move generation.
- * @returns {Map<Square, SquareSet>} A map of source squares to their corresponding sets of possible destination squares.
- */
+  * Calculates all possible destination squares for each piece of the current player.
+  * @param {Context} [ctx] The optional context for the move generation.
+  * @returns {Map<Square, SquareSet>} A map of source squares to their corresponding sets of possible destination squares.
+  */
  allDests(ctx?: Context): Map<Square, SquareSet> {
  ctx = ctx || this.ctx();
  const d = new Map();
@@ -793,7 +792,7 @@ const validEpSquare = (pos: Position, square: Square | undefined): Square | unde
 
 /**
  * Finds and returns all legal en passant squares in the position.
- * @param {Position} pos 
+ * @param {Position} pos
  * @returns {Square | undefined}
  */
 const legalEpSquare = (pos: Position): Square | undefined => {
@@ -830,12 +829,11 @@ const canCaptureEp = (pos: Position, pawnFrom: Square, ctx: Context): boolean =>
  .isEmpty();
 };
 
-
 /**
  * Checks various castling conditions and returns a set of squares that can be castled to.
- * @param {Position} pos 
- * @param {CastlingSide} side 
- * @param {Context} ctx 
+ * @param {Position} pos
+ * @param {CastlingSide} side
+ * @param {Context} ctx
  * @returns {SquareSet} A set of squares that can be castled to. Can be empty.
  */
 const castlingDest = (pos: Position, side: CastlingSide, ctx: Context): SquareSet => {
@@ -855,12 +853,10 @@ const castlingDest = (pos: Position, side: CastlingSide, ctx: Context): SquareSe
  // Remove the king position
  const occ = pos.board.occupied.without(ctx.king);
 
-
  for (const sq of kingPath) {
  if (pos.kingAttackers(sq, opposite(pos.turn), occ).nonEmpty()) return SquareSet.empty();
  }
 
-
  const rookTo = rookCastlesTo(pos.turn, side);
  const after = pos.board.occupied.toggle(ctx.king).toggle(rook).toggle(rookTo);
  if (pos.kingAttackers(kingTo, opposite(pos.turn), after).nonEmpty()) return SquareSet.empty();
@@ -870,12 +866,12 @@ const castlingDest = (pos: Position, side: CastlingSide, ctx: Context): SquareSe
 
 /**
  * Calculates the pseudo-legal destination squares for a given piece on a square.
- * 
- * Pseudo-legal destinations refer to the set of squares that a piece can potentially move to, without 
- * considering the legality of the move in the context of the current position. They include moves that 
- * may be illegal, such as leaving the king in check. Pseudo-legal moves need to be further filtered to 
+ *
+ * Pseudo-legal destinations refer to the set of squares that a piece can potentially move to, without
+ * considering the legality of the move in the context of the current position. They include moves that
+ * may be illegal, such as leaving the king in check. Pseudo-legal moves need to be further filtered to
  * determine the actual legal moves in the given position.
- * 
+ *
  * @param {Position} pos The chess position.
  * @param {Square} square The square of the piece.
  * @param {Context} ctx The context for the position.

src/compat.ts

@@ -22,7 +22,7 @@ export interface ChessgroundDestsOpts {
  * Includes both possible representations of castling moves (unless
  * `chess960` mode is enabled), so that the `rookCastles` option will work
  * correctly.
- * @param {Position} pos 
+ * @param {Position} pos
  * @param {ChessgroundDestsOpts} [opts]
  */
 export const chessgroundDests = (pos: Position, opts?: ChessgroundDestsOpts): Map<SquareName, SquareName[]> => {
@@ -68,7 +68,7 @@ export const scalachessCharPair = (move: Move): string =>
 
 /**
  * Converts chessops chess variant names to lichess chess rule names
- * @param variant 
+ * @param variant
  * @returns {Rules}
  */
 export const lichessRules = (
@@ -102,8 +102,8 @@ export const lichessRules = (
 
 /**
  * Conversts chessops rule name to lichess variant name.
- * @param rules 
- * @returns 
+ * @param rules
+ * @returns
  */
 export const lichessVariant = (
  rules: Rules,

src/fen.ts

@@ -27,7 +27,7 @@ export enum InvalidFen {
  Fullmoves = 'ERR_FULLMOVES',
 }
 
-export class FenError extends Error { }
+export class FenError extends Error {}
 
 const nthIndexOf = (haystack: string, needle: string, n: number): number => {
  let index = haystack.indexOf(needle);
@@ -48,7 +48,7 @@ const charToPiece = (ch: string): Piece | undefined => {
 /**
  * TODO: what is a "boardPart"?
  * Takes a FEN and produces a Board object representing it
- * @param boardPart 
+ * @param boardPart
  * @returns {Result<Board, FenError>}
  */
 export const parseBoardFen = (boardPart: string): Result<Board, FenError> => {
@@ -149,7 +149,7 @@ export const parseCastlingFen = (board: Board, castlingPart: string): Result<Squ
 
 /**
  * Useful for three-check, four-check, n-check variants.
- * 
+ *
  * Parses the remaining checks part of a FEN string and returns the corresponding RemainingChecks object.
  *
  * @param {string} part The remaining checks part of the FEN string.
@@ -378,7 +378,6 @@ export const makeBoardFen = (board: Board): string => {
  return fen;
 };
 
-
 /**
  * Converts a MaterialSide object to its string representation.
  *
@@ -433,7 +432,6 @@ export const makeCastlingFen = (board: Board, castlingRights: SquareSet): string
  */
 export const makeRemainingChecks = (checks: RemainingChecks): string => `${checks.white}+${checks.black}`;
 
-
 /**
  * Converts a Setup object to its FEN string representation.
  *