19 lines
325 B
JavaScript
19 lines
325 B
JavaScript
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/* @flow */
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declare class Bar<K> {
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update<K_>(updater: (value: this) => Bar<K_>): Bar<K_>;
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}
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declare function foo<U>(
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initialValue: U,
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callbackfn: (previousValue: U) => U
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): U;
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declare var items: Bar<string>;
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declare var updater: (value: Bar<string>) => Bar<string>;
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foo(
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items,
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(acc) => acc.update(updater)
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);
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