diff --git a/packages/dataverse/src/prism/prism.ts b/packages/dataverse/src/prism/prism.ts
index 2dc1888..d49692d 100644
--- a/packages/dataverse/src/prism/prism.ts
+++ b/packages/dataverse/src/prism/prism.ts
@@ -254,7 +254,7 @@ class PrismInstance<V> implements Prism<V> {
   }
 
   /**
-   * Returns a tappable that fires every time the prism's state goes from `fresh-\>stale.`
+   * Calls `callback` every time the prism's state goes from `fresh-\>stale.` Returns an `unsubscribe()` function.
    */
   onStale(callback: () => void): VoidFn {
     const untap = () => {
diff --git a/packages/dataverse/src/utils/Emitter.test.ts b/packages/dataverse/src/utils/Emitter.test.ts
deleted file mode 100644
index bf2cf31..0000000
--- a/packages/dataverse/src/utils/Emitter.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import Emitter from './Emitter'
-
-describe('DataVerse.Emitter', () => {
-  it('should work', () => {
-    const e: Emitter<string> = new Emitter()
-    e.emit('no one will see this')
-    e.emit('nor this')
-
-    const tappedEvents: string[] = []
-    const untap = e.tappable.tap((payload) => {
-      tappedEvents.push(payload)
-    })
-    e.emit('foo')
-    e.emit('bar')
-    untap()
-    e.emit('baz')
-    expect(tappedEvents).toMatchObject(['foo', 'bar'])
-  })
-})
diff --git a/packages/dataverse/src/utils/Emitter.ts b/packages/dataverse/src/utils/Emitter.ts
deleted file mode 100644
index 5cc3124..0000000
--- a/packages/dataverse/src/utils/Emitter.ts
+++ /dev/null
@@ -1,76 +0,0 @@
-import Tappable from './Tappable'
-
-type Tapper<V> = (v: V) => void
-type Untap = () => void
-
-/**
- * An event emitter. Emit events that others can tap (subscribe to).
- */
-export default class Emitter<V> {
-  private _tappers: Map<any, (v: V) => void>
-  private _lastTapperId: number
-  private _onNumberOfTappersChangeListener: undefined | ((n: number) => void)
-
-  /**
-   * The Tappable associated with this emitter. You can use this to tap (subscribe to) events emitted.
-   */
-  readonly tappable: Tappable<V>
-
-  constructor() {
-    this._lastTapperId = 0
-    this._tappers = new Map()
-    this.tappable = new Tappable({
-      tapToSource: (cb: Tapper<V>) => this._tap(cb),
-    })
-  }
-
-  _tap(cb: Tapper<V>): Untap {
-    const tapperId = this._lastTapperId++
-    this._tappers.set(tapperId, cb)
-    this._onNumberOfTappersChangeListener?.(this._tappers.size)
-    return () => {
-      this._removeTapperById(tapperId)
-    }
-  }
-
-  _removeTapperById(id: number) {
-    const oldSize = this._tappers.size
-    this._tappers.delete(id)
-    const newSize = this._tappers.size
-    if (oldSize !== newSize) {
-      this._onNumberOfTappersChangeListener?.(newSize)
-    }
-  }
-
-  /**
-   * Emit a value.
-   *
-   * @param payload - The value to be emitted.
-   */
-  emit(payload: V) {
-    for (const cb of this._tappers.values()) {
-      cb(payload)
-    }
-  }
-
-  /**
-   * Checks whether the emitter has tappers (subscribers).
-   */
-  hasTappers() {
-    return this._tappers.size !== 0
-  }
-
-  /**
-   * Calls callback when the number of tappers (subscribers) changes.
-   *
-   * @example
-   * ```ts
-   * emitter.onNumberOfTappersChange((n) => {
-   *   console.log("number of tappers changed:", n)
-   * })
-   * ```
-   */
-  onNumberOfTappersChange(cb: (n: number) => void) {
-    this._onNumberOfTappersChangeListener = cb
-  }
-}
diff --git a/packages/dataverse/src/utils/Tappable.ts b/packages/dataverse/src/utils/Tappable.ts
deleted file mode 100644
index 560b9db..0000000
--- a/packages/dataverse/src/utils/Tappable.ts
+++ /dev/null
@@ -1,92 +0,0 @@
-type Untap = () => void
-type UntapFromSource = () => void
-
-interface IProps<V> {
-  tapToSource: (cb: (payload: V) => void) => UntapFromSource
-}
-
-type Listener<V> = ((v: V) => void) | (() => void)
-
-/**
- * Represents a data-source that can be tapped (subscribed to).
- */
-export default class Tappable<V> {
-  private _props: IProps<V>
-  private _tappers: Map<number, {bivarianceHack(v: V): void}['bivarianceHack']>
-  private _untapFromSource: null | UntapFromSource
-  private _lastTapperId: number
-  private _untapFromSourceTimeout: null | NodeJS.Timer = null
-
-  constructor(props: IProps<V>) {
-    this._lastTapperId = 0
-    this._untapFromSource = null
-    this._props = props
-    this._tappers = new Map()
-  }
-
-  private _check() {
-    if (this._untapFromSource) {
-      if (this._tappers.size === 0) {
-        this._scheduleToUntapFromSource()
-        /*
-         * this._untapFromSource()
-         * this._untapFromSource = null
-         */
-      }
-    } else {
-      if (this._tappers.size !== 0) {
-        this._untapFromSource = this._props.tapToSource(this._cb)
-      }
-    }
-  }
-
-  private _scheduleToUntapFromSource() {
-    if (this._untapFromSourceTimeout !== null) return
-    this._untapFromSourceTimeout = setTimeout(() => {
-      this._untapFromSourceTimeout = null
-      if (this._tappers.size === 0) {
-        this._untapFromSource!()
-
-        this._untapFromSource = null
-      }
-    }, 0)
-  }
-
-  private _cb: any = (arg: any): void => {
-    for (const cb of this._tappers.values()) {
-      cb(arg)
-    }
-  }
-
-  /**
-   * Tap (subscribe to) the data source.
-   *
-   * @param cb - The callback to be called on a change.
-   */
-  tap(cb: Listener<V>): Untap {
-    const tapperId = this._lastTapperId++
-    this._tappers.set(tapperId, cb)
-    this._check()
-    return () => {
-      this._removeTapperById(tapperId)
-    }
-  }
-
-  private _removeTapperById(id: number) {
-    this._tappers.delete(id)
-    this._check()
-  }
-
-  // /**
-  //  * @deprecated
-  //  */
-  // map<T>(transform: {bivarianceHack(v: V): T}['bivarianceHack']): Tappable<T> {
-  //   return new Tappable({
-  //     tapToSource: (cb: (v: T) => void) => {
-  //       return this.tap((v: $IntentionalAny) => {
-  //         return cb(transform(v))
-  //       })
-  //     },
-  //   })
-  // }
-}