Update return types of APIs #15887
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Update return types of APIs #15887
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ghost
reviewed
May 16, 2017
| @@ -50,7 +50,7 @@ namespace ts { | |||
| // stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise, | |||
| // embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns | |||
| // a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned. | |||
| export function forEachChild<T>(node: Node, cbNode: (node: Node) => T, cbNodeArray?: (nodes: Node[]) => T): T { | |||
| export function forEachChild<T>(node: Node, cbNode: (node: Node) => T, cbNodeArray?: (nodes: Node[]) => T): T | undefined { | |||
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The callbacks should also return T | undefined.
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This PR updates some return types to include undefined. That helps documenting the API and prevents bugs when using strictNullChecks
Fixes #15841