Errors on custom components (when persisting data and format label)

Looks like you are passing SQConstantExpr type value (as per powerbi.data.SQExprBuilder.text() call) where persistProperties  method requires DataViewPropertyValue, so the following code works in both Desktop and Online:

                SynopticPanelBySQLBI.prototype.persistData = function () {
                    var properties = {};
                    properties.imageData = (this.data.imageData ? this.data.imageData : '');
                    //properties.imageData = (this.data.imageData ? powerbi.data.SQExprBuilder.text(String(this.data.imageData)) : '');
                    this.host.persistProperties({
                        merge: [{
                            objectName: 'general',
                            selector: null,
                            properties: properties,
                        }]
                    });
                };

PS. It works in Desktop as changes in SQExprBuilder have not been reflected to Desktop yet. Using primitive type instead of SQExprBuilder is correct way here.

Thx!

Sergey