When we decorate a function variable, class or anything with @deprecated. By doing that, VSCode will understand and show it with a strikethrough style:
/**
* @deprecated This method is deprecated. Please `render` instead
*/
function oldRender(){}
function render(){}
const TestLib = {
oldRender,
render
};
TestLib.oldRender(); // <strikethrough and deprecate message
And it looks like this: