4052dd8188
This is useful for propagating return values without them being converted to a string. It still provides the same guarantees to Closure, which will assume that the function invoked is pure and can be tree-shaken accordingly. PR Close #35769
21 lines
781 B
TypeScript
21 lines
781 B
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* Convince closure compiler that the wrapped function has no side-effects.
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*
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* Closure compiler always assumes that `toString` has no side-effects. We use this quirk to
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* allow us to execute a function but have closure compiler mark the call as no-side-effects.
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* It is important that the return value for the `noSideEffects` function be assigned
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* to something which is retained otherwise the call to `noSideEffects` will be removed by closure
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* compiler.
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*/
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export function noSideEffects<T>(fn: () => T): T {
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return {toString: fn}.toString() as unknown as T;
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}
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