Migration from EVA ICS JS Framework

EVA ICS WebEngine is fully compatible with EVA ICS JS Framework except the following:

• WebEngine is distributed as a ES/UMD modules only (with TypeScript definitions)

• EVA ICS v3 is no longer supported

• The primary class has been renamed from “EVA” to “Eva”

• the default “Eva”-class object can be registered in web browsers with manually calling “register_legacy_globals()” method of the main class

• Web socket mode is now turned on by default

• eva.interval has been renamed to eva.set_interval

• eva.log_level has been renamed to eva.set_log_level

• eva.debug turns debug logs however to see messages in the JS console, its log level must be additionally set to “Verbose”. Despite of that, it is not recommended to enable debug mode in production as it causes CPU load

• “fetch” is no longer bundled as it is present in the majority of environments. For older environments consider manually importing a polyfill (e.g. “node-fetch”) and setting it to eva.external.fetch.

• “WebSocket” is no longer bundled by default. If working in environment with no native websocket support, consider either setting “eva.ws_mode” to false or using an external module (e.g. “ws”) and setting it to eva.external.WebSocket.

• QRious is no longer bundled by default. If QR codes are required, consider manually importing “QRious” module and setting it to eva.external.QRious.

• EVA ICS HMI WASM extension is already compatible with the new module, consider asking your support engineer for upgrade.

• It is no longer necessary to restart the engine when state_updates property is changed - consider using set_state_updates method to modify state update policy in runtime (requires EVA ICS v4 build 2023061801 or later).