@jupyterlab/coreutils/lib/interfaces.d.ts

JupyterLab - Core Utilities

/**
 * A generic interface for change emitter payloads.
 */
export interface IChangedArgs<T, OldT = T, U extends string = string> {
    /**
     * The name of the changed attribute.
     */
    name: U;
    /**
     * The old value of the changed attribute.
     */
    oldValue: OldT;
    /**
     * The new value of the changed attribute.
     */
    newValue: T;
}