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Type Alias: Event<T> ​

ts
type Event<T> = (listener) => Disposable;

Defined in: packages/sdk/src/event.ts:28

A subscribable event: call it with a listener and receive a Disposable that cancels the subscription. Modeled on VS Code's Event<T> convention.

Services that emit events expose a member typed as Event<T> — the consuming extension calls it directly and pushes the returned disposable onto ctx.subscriptions:

Type Parameters ​

T ​

T

Parameters ​

listener ​

(e) => void

Returns ​

Disposable

Example ​

ts
ctx.subscriptions.push(
  ctx.editors.onDidSave(({ editorId, filePath }) => {
    console.log("saved", filePath);
  }),
);

Host-side: the matching emitter (EventEmitter<T>) lives in the extension-host package (not the SDK). Only the subscribable Event<T> type is public — extensions never construct emitters.