initialiser. But this is only correct when the initialiser is for a
parameter. For example:
```ts
declare let x: { s: string } | undefined;
const { s } = x;
```
This PR removes undefined from the type of a binding pattern only when
the binding pattern's parent is a parameter. This fixes the regression
from 3.8. However, it's still not the ideal fix; we should be able to
use control flow to solve this problem. Consider:
```ts
const { s }: { s: string } | undefined = { s: 'hi' }
declare function f({ s }: { s: string } | undefined = { s: 'hi' }): void
```
Neither line should have an error, but the first does in 3.8 and after
this change.
* Propagate nonInferrableType in &&, || and ?? operators
* Add regression test
* Simpler solution: getTypeFacts(neverType) should return TypeFacts.None
* Add fastpath to isRelatedTo for type references
* Do not check intersections or unions to ignore propegating reference flags, properly set comparing jsx flag
* Re-remove unneeded check
* Just check for TypeFlags.Object
* Remove else clause
* Consolidated extra property check with intersections
* Fix comment
* Add tests
* Properly propagate intersectionState
* Route property check through recursive type tracking logic
* Accept new baselines
* Skip check when apparent type of source is never
* Accept new baselines
* Only check when apparent type of source is a structured type
* Elaborate on reasons for 'never' intersections
* Accept new API baselines
* Accept new baselines
* Add tests
* Accept new baselines
* Address CR feedback
* Explicitly merge module augmentation members into the exports added by export * declarations
* Use ?., add namespace merge test
* Add missing merged symbol call to handle enum/ns merges during entity name lookup
* Add test with error case
* Handle missing value declarations in more places, unify duplicate declaration error handling to improve assignment declaration duplicate errors
* Fix crash on bad namespace parse
`global` inside a class body is parsed as a module declaration, and in
the following example has no body:
```ts
class C {
global x
}
```
`x` is parsed as a separate ExpressionStatement. This caused a crash in
emit because the code didn't expect a module declaration with no body.
* inline node.body variable
* fix missed references to body
* Make never rest type top-like
* Add higher-order test
* properly support types which reduce to never
Co-authored-by: Wesley Wigham <wwigham@gmail.com>
* New diagnostic message for wrong JSX function component
* Component and Mixed type
* fix existing tests
* add new test for JSX component return type error
* fix tslint error
* update diagnostic message to include component name
* accept baseline
* update tests
* missing semicolon
* accept baseline
Co-authored-by: Wesley Wigham <wwigham@gmail.com>
* Add the 'awaited' type operator
* Add script to manually add reviewers to a PR when GH 'Suggested Reviewers' breaks
* Fix lint error in review script
* Only defer generic awaited type for possible thenable
* Add variance-like behavior for awaited
* Switch awaited type params to 'unreliable' variance
* fix typo in inferTypes
* LKG without syntax in lib
* LKG with new syntax in lib
* Add 'strictAwaitedTypes' flag
* Treat strictAwaitedTypes as strict-mode flag
* Rename TAll, remove duplicate definition of 'race'
* Apply suggestions from code review
Co-Authored-By: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>
* Fix inference priority
* Update comment to isGenericAwaitableType
* Add overloads for then/catch to Promise
* Add inference heuristic for T | PromiseLike<T> (for any PromiseLike)
* Remove strictAwaitedTypes flag
Co-authored-by: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>
* Improve jsx tag error span
* Move solution to parseJsxChild func
* Add tests and update baselines
* Update comment in src/compiler/parser.ts
Co-Authored-By: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
* Use skipTrivia to check for whitespaces and other trivia
* Import React into errorSpanForUnclosedJsxTag.tsx
* .
* .
Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
