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When developing for BrightSign players, you must write in BrightScript at some point (unless you are using BrightAuthor:connected) though most users are not familiar with this language. Traditionally, every application, presentation, video, etc. that ran on a BrightSign player was driven by BrightScript. However, since Since most users today want to use JavaScript to develop their applications and control the player, BrightSign has been working to accommodate that. Nevertheless, BrightScript remains integral because without an autorun.brs file, written in BrightScript, your player will not behave as intended.
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