Function printBinaryishExpressions

src/language-js/print/binaryish.js:195–361

(
  path,
  options,
  print,
  isNested,
  isInsideParenthesis,
)

// level, things are naturally broken up correctly, i.e. `&&` is
// broken before `+`.
function printBinaryishExpressions(
  path,
  options,
  print,
  isNested,
  isInsideParenthesis,
) {
  const { node } = path;

  // Simply print the node normally.
  if (!isBinaryish(node)) {
    return [group(print())];
  }

  /** @type{Doc[]} */
  let parts = [];

  // We treat BinaryExpression and LogicalExpression nodes the same.

  // Put all operators with the same precedence level in the same
  // group. The reason we only need to do this with the `left`
  // expression is because given an expression like `1 + 2 - 3`, it
  // is always parsed like `((1 + 2) - 3)`, meaning the `left` side
  // is where the rest of the expression will exist. Binary
  // expressions on the right side mean they have a difference
  // precedence level and should be treated as a separate group, so
  // print them normally. (This doesn't hold for the `**` operator,
  // which is unique in that it is right-associative.)
  // @ts-expect-error -- FIXME
  if (shouldFlatten(node.operator, node.left.operator)) {
    // Flatten them out by recursively calling this function.
    parts = path.call(
      () =>
        printBinaryishExpressions(
          path,
          options,
          print,
          /* isNested */ true,
          isInsideParenthesis,
        ),
      "left",
    );
  } else {
    parts.push(group(print("left")));
  }

  const shouldInline = shouldInlineLogicalExpression(node);
  const rightNodeToCheckComments =
    node.right.type === "ChainExpression" ? node.right.expression : node.right;
  const lineBeforeOperator =
    (node.type === "NGPipeExpression" ||
      node.operator === "|>" ||
      isVueFilterSequenceExpression(path, options)) &&
    !hasLeadingOwnLineComment(options.originalText, rightNodeToCheckComments);
  const hasTypeCastComment = hasComment(
    rightNodeToCheckComments,
    CommentCheckFlags.Leading,
    isTypeCastComment,