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import {
Map as ImmutableMap,
Set as ImmutableSet,
} from 'immutable';
// Immutable.js collections
const mapImmutable: ImmutableMap<string, number> = ImmutableMap<string, number>();
const setImmutable: ImmutableSet<string> = ImmutableSet<string>();
// $ExpectType Map<string, number>
mapImmutable.delete('foo');
// ES6 collections
const mapES6: Map<string, number> = new Map<string, number>();
const setES6: Set<string> = new Set<string>();
// $ExpectType boolean
mapES6.delete('foo');
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