ECMAScript 5 was released in 2009 and is now obsolete. ES5 support is required for JavaScript to run in Internet Explorer, which is also deprecated, and Microsoft strongly discourages its use.

When developing Stimulsoft Reports.JS and Stimulsoft Dashboards.JS, we use the modern ECMAScript 6 standard, which has more functionalities, optimizations, and improved performance. All modern web browsers support ES6.

Starting with version 2020.5.2, we will support ES5 in the fix mode only. This is due to the complexity of developing and testing ES5 scripts and the lack of ES5 support in other modules used in our product. We plan to support the ES5 standard for at least six months and monitor its relevance, the situation, and Microsoft's policy regarding Internet Explorer. We will inform you about the complete end of support.