Symbol.dispose / Symbol.asyncDispose ponyfill
npm install symbol-disposeSymbol.dispose/Symbol.asyncDispose ponyfill
ts
import * as symbol from 'symbol-dispose';
console.log(symbol);
//=> { dispose: Symbol(dispose), asyncDispose: Symbol(asyncDispose) }
someObject[symbol.dispose] = () => someObject.removeEventListener('data', handler);
``
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