Alex Rickabaugh f4c536ae36 feat(ivy): logical not and safe navigation operation handling in TCBs (#29698)
This commit adds support in the template type-checking engine for handling
the logical not operation and the safe navigation operation.

Safe navigation in particular is tricky, as the View Engine implementation
has a rather inconvenient flaw. View Engine checks a safe navigation
operation `a?.b` as:

```typescript
(a != null ? a!.b : null as any)
```

The type of this expression is always 'any', as the false branch of the
ternary has type 'any'. Thus, using null-safe navigation throws away the
type of the result, and breaks type-checking for the rest of the expression.

A flag is introduced in the type-checking configuration to allow Ivy to
mimic this behavior when needed.

Testing strategy: TCB tests included.

PR Close #29698
2019-04-19 11:15:25 -07:00
2019-01-11 11:15:59 -08:00

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