9d9c9e43e5
The usage of array spread syntax in source code may be downleveled to a call to TypeScript's `__spread` helper function from `tslib`, depending on the options `downlevelIteration` and `emitHelpers`. This proves problematic for ngcc when it is processing ES5 formats, as the static evaluator won't be able to interpret those calls. A custom foreign function resolver is not sufficient in this case, as `tslib` may be emitted into the library code itself. In that case, a helper function can be resolved to an actual function with body, such that it won't be considered as foreign function. Instead, a reflection host can now indicate that the definition of a function corresponds with a certain TypeScript helper, such that it becomes statically evaluable in ngtsc. Resolves #30299 PR Close #30492
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