How to use the estraverse.Syntax.BlockStatement function in estraverse

_this.referencingDefaultValue(pattern, info.assignments, null, true);
                    });
                }

                // if there's a rest argument, add that
                if (node.rest) {
                    this.visitPattern({
                        type: "RestElement",
                        argument: node.rest
                    }, function (pattern) {
                        _this.currentScope().__define(pattern, new ParameterDefinition(pattern, node, node.params.length, true));
                    });
                }

                // Skip BlockStatement to prevent creating BlockStatement scope.
                if (node.body.type === Syntax.BlockStatement) {
                    this.visitChildren(node.body);
                } else {
                    this.visit(node.body);
                }

                this.close(node);
            }
        },

_this.referencingDefaultValue(pattern, info.assignments, null, true);
                    });
                }

                // if there's a rest argument, add that
                if (node.rest) {
                    this.visitPattern({
                        type: "RestElement",
                        argument: node.rest
                    }, function (pattern) {
                        _this.currentScope().__define(pattern, new ParameterDefinition(pattern, node, node.params.length, true));
                    });
                }

                // Skip BlockStatement to prevent creating BlockStatement scope.
                if (node.body.type === Syntax.BlockStatement) {
                    this.visitChildren(node.body);
                } else {
                    this.visit(node.body);
                }

                this.close(node);
            }
        },

this.currentScope().__define(pattern,
                    new ParameterDefinition(
                        pattern,
                        node,
                        node.params.length,
                        true
                    ));
            });
        }

        // In TypeScript there are a number of function-like constructs which have no body,
        // so check it exists before traversing
        if (node.body) {

            // Skip BlockStatement to prevent creating BlockStatement scope.
            if (node.body.type === Syntax.BlockStatement) {
                this.visitChildren(node.body);
            } else {
                this.visit(node.body);
            }
        }

        this.close(node);
    }

this.visitPattern({
                type: 'RestElement',
                argument: node.rest
            }, (pattern) => {
                this.currentScope().__define(pattern,
                    new ParameterDefinition(
                        pattern,
                        node,
                        node.params.length,
                        true
                    ));
            });
        }

        // Skip BlockStatement to prevent creating BlockStatement scope.
        if (node.body.type === Syntax.BlockStatement) {
            this.visitChildren(node.body);
        } else {
            this.visit(node.body);
        }

        this.close(node);
    }

this.currentScope().__define(pattern,
                    new ParameterDefinition(
                        pattern,
                        node,
                        node.params.length,
                        true
                    ));
            });
        }

        // In TypeScript there are a number of function-like constructs which have no body,
        // so check it exists before traversing
        if (node.body) {

            // Skip BlockStatement to prevent creating BlockStatement scope.
            if (node.body.type === Syntax.BlockStatement) {
                this.visitChildren(node.body);
            } else {
                this.visit(node.body);
            }
        }

        this.close(node);
    }

this.visitPattern({
                type: 'RestElement',
                argument: node.rest
            }, (pattern) => {
                this.currentScope().__define(pattern,
                    new ParameterDefinition(
                        pattern,
                        node,
                        node.params.length,
                        true
                    ));
            });
        }

        // Skip BlockStatement to prevent creating BlockStatement scope.
        if (node.body.type === Syntax.BlockStatement) {
            this.visitChildren(node.body);
        } else {
            this.visit(node.body);
        }

        this.close(node);
    }

_this.referencingDefaultValue(pattern, info.assignments, null, true);
                    });
                }

                // if there's a rest argument, add that
                if (node.rest) {
                    this.visitPattern({
                        type: "RestElement",
                        argument: node.rest
                    }, function (pattern) {
                        _this.currentScope().__define(pattern, new ParameterDefinition(pattern, node, node.params.length, true));
                    });
                }

                // Skip BlockStatement to prevent creating BlockStatement scope.
                if (node.body.type === Syntax.BlockStatement) {
                    this.visitChildren(node.body);
                } else {
                    this.visit(node.body);
                }

                this.close(node);
            }
        },

function cpsFinalStatement(node, k, fk) {
  return match(node, [
    clause(Syntax.BlockStatement, function(body) {
      return cpsSequence(body, 0, k, fk);
    }),
    clause(Syntax.EmptyStatement, function() {
      return cps(build.identifier('undefined'), k);
    }),
    clause(Syntax.ExpressionStatement, function(expression) {
      return cps(expression, k);
    }),
    clause(Syntax.IfStatement, function(test, consequent, alternate) {
      if (!alternate) {
        alternate = build.emptyStatement();
      }

      return bindContinuation(k, function(k) { // most likely unnecessary
        return atomize(test, function(test) {
          return build.conditionalExpression(test,

}

    if (isMethodDefinition) {
        return true;
    }

    if (scope.type === "class" || scope.type === "module") {
        return true;
    }

    if (scope.type === "block" || scope.type === "switch") {
        return false;
    }

    if (scope.type === "function") {
        if (block.type === Syntax.ArrowFunctionExpression && block.body.type !== Syntax.BlockStatement) {
            return false;
        }

        if (block.type === Syntax.Program) {
            body = block;
        } else {
            body = block.body;
        }

        if (!body) {
            return false;
        }
    } else if (scope.type === "global") {
        body = block;
    } else {
        return false;

function linearizeSequence(ss, i, ks) {
  if (i === ss.length) {
    return ks;
  }
  else {
    ks = linearizeSequence(ss, i + 1, ks);

    return match(ss[i], [
      clause(Syntax.BlockStatement, function(body) {
        return linearizeSequence(body, 0, ks);
      }),
      clause(Syntax.IfStatement, function(test, consequent, alternate) {
        if (alternate === null) {
          alternate = build.emptyStatement();
        }

        if (hasReturn(consequent) || hasReturn(alternate)) {
          return [build.ifStatement(
              test,
              build.blockStatement(linearizeSequence([consequent], 0, ks)),
              build.blockStatement(linearizeSequence([alternate], 0, ks)))];
        }
        else {
          return [build.ifStatement(test, consequent, alternate)].concat(ks);
        }