JoostK 1388c1761f perf(compiler-cli): don't emit template guards when child scope is empty (#38418)
For a template that contains for example `<span *ngIf="first"></span>`
there's no need to render the `NgIf` guard expression, as the child
scope does not have any type-checking statements, so any narrowing
effect of the guard is not applicable.

This seems like a minor improvement, however it reduces the number of
flow-node antecedents that TypeScript needs to keep into account for
such cases, resulting in an overall reduction of type-checking time.

PR Close #38418
2020-08-13 13:28:46 -07:00
2020-01-27 09:31:22 -08:00
2020-01-13 07:21:43 -08:00

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