Even if (1) @extends is provided and (2) we're not producing
diagnostics. That's because we need to know whether the extends clause
references an imported alias.
* Change the default type parameter constraint and default to unknown from {}
* Relax unknown checking outside of strictNullChecks a bit
* Increase strictness on index signatures with type `unknown` so inference doesnt change surprisingly
* Remove redundant switch
* Forbid accessing const & let on globalThis
It's just an error; you still get the type of the property.
* Disallow access of blockscoped vars on globalThis
Also change Array, Function, String, et al from `const` to `var` so that
they remain accessible via `globalThis.String`.
* Update baselines after lib.d.ts change
Note especially the change in redefineArray, which is now allowed as
long as you provide a type that is assignable to ArrayConstructor.
* Remove blockscoped vars from typeof globalThis
Unlike forbidding them, this removes the properties entirely.
Unfortunately, this means that accessing these properties is only an
error with noImplicitAny, and that error is quite confusing.
Let's discuss our options. I see 3:
1. Forbid access of block-scoped vars as properties (in all flag
settings), but leave them on the type. Simple to implement.
2. Remove block-scoped vars from the globalThis type. Has the bad
error/flag behaviour described above, but simple to implement.
3. Remove block-scoped vars from the globalThis type. Also, forbid
accessing them by executing another resolveName lookup for failed
property accesses on globalThisSymbol. If the second lookup returns a
blockscoped var, issue an error instead of falling back to the index
signature. This seems too complex to me.
* Update baselines
* Better error for block-scoped usage on globalThis
So that value-space references have as clear an error as type-space
references.
* Update fourslash tests
* Fix semi-colon lint
* Don't copy so much when filtering blockscoped vars
* span on first arg that exceeds arity
* refactor baseline
* handle cases for spread arguments
* refactor + add coverage for tuple spread cases
* create diagnostic on NodeArray of exceeding args
* test function overloading
* Restore original code from bind-toplevel-this
With one or two additional comments
* Working in JS, but the symbol is not right.
Still need to
1. Make it work in Typescript.
2. Add test (and make them work) for the other uses of GlobalThis:
window, globalThis, etc.
* Check in TS also; update some tests
Lots of tests still fail, but all but 1 change so far has been correct.
* Update baselines
A couple of tests still fail and need to be fixed.
* Handle type references to globalThis
The type reference must be `typeof globalThis`. Just `globalThis` will
be treated as a value reference in type position -- an error.
* Restore former behaviour of implicitThis errors
I left the noImplicitThis rule for captured use of global this in an
arrow function, even though technically it isn't `any` any more --
it's typeof globalThis. However, you should still use some other method
to access globals inside an arrow, because captured-global-this is super
confusing there.
* Test values with type globalThis
I ran into a problem with intersecting `Window & typeof globalThis`:
1. This adds a new index signature to Window, which is probably not
desired. In fact, with noImplicitAny, it's not desired on globalThis
either I think.
2. Adding this type requires editing TSJS-lib-generator, not this repo.
So I added the test cases and will probably update them later, when
those two problems are fixed.
* Add esnext declaration for globalThis
* Switch to symbol-based approach
I decided I didn't like the import-type-based approach.
Update baselines to reflect the difference.
* Do not suggest globals for completions at toplevel
* Add tests of element and property access
* Look up globalThis using normal resolution
globalThis is no longer constructed lazily. Its synthetic Identifier
node is also now more realistic.
* Update fourslash tests
* Add missed fourslash test update
* Remove esnext.globalthis.d.ts too
* Add chained globalThis self-lookup test
* Attempt at making globalThis readonly
In progress, had to interrupt for other work.
* Add/update tests
* Addres PR comments:
1. Add parameter to tryGetThisTypeAt to exclude globalThis.
2. Use combined Module flag instead combining them in-place.
3. SymbolDisplay doesn't print 'module globalThis' for this expressions
anymore.
Previously, the compiler would crash when binding a non-top-level
property assignment on the symbol of an unresolved module:
```js
import x from 'arglebaz'
{
x.bar = 1
}
```
That's because `x` looks like an alias but doesn't have a
valueDeclaration (since there is no file named 'arglebaz'), and the new
code for binding Object.defineProperty calls forgot to check for an
undefined valueDeclaration.
This change adds the checks for an undefined valueDeclaration.
Previously, type checking was turned off for all assignment
declarations. This is a problem when the declarations are annotated with
jsdoc types.
This PR checks assignment declarations, *except* for expando
initialisers. Expando initialisers are
1. Empty object types.
2. Function types.
3. Class types.
4. Non-empty object types when the assignment declaration kind is
prototype assignment or module.exports assignment.
* Set-only accessors spread to undefined
Previously they were skipped. The runtime behaviour is to create a
property of type undefined, unlike (for example) spreading numbers or
other primitives. So now spreading a set-only accessor creates a
property of type undefined:
```ts
const o: { foo: undefined } = { ...{ set foo(v: number) { } } }
```
Notably, `o.foo: undefined` not `number`.
Fixes#26337
* Fix isSpreadableProperty oversimplification
* Do not merge commonsjs exports onto an alias
getCommonJSExportEquals merges export assignments and export property
assignments. Something like this, which has no equivalent structure in
TS:
```js
module.exports = function() { }
module.exports.expando = 1
```
However, it is sometimes called with an alias, when its
parent, resolveExternalModuleSymbol, is called with dontResolveAlias:
true, and when the initialiser of the export assignment is an alias:
```js
function alias() { }
module.exports = alias
module.exports.expando = 1
```
In this case, (1) the actual value `alias` will have already merged in a
previous call to getCommonJSExportEquals and
(2) getTypeOfSymbol will follow the alias symbol to get the right type.
So getCommonJSExportEquals should do nothing in this case.
This bug manifests in the code for dynamic imports, which calls
getTypeOfSymbol on the incorrectly merged alias, which now has enough
value flags--Function, for example--to take the wrong branch and
subsequently crash.
* Update baselines
* Obey the excludeArgument parameter when checking JSX signature validity
* Fix conditional type extending any contextual types and accept baselines
* use flag check to also drop unknown from comparison for the same reason
* Slight refinement - make an intersection to ensure parameter constraints flow through contextual types when instantiated
* Format ternary more nicely
* Add new special assignment kinds for recognizing Object.defineProperty calls
* Add support for prototype assignments, fix nits
* Fix code review comments
* Add test documenting behavior in a few more odd scenarios
In JS, when you assign `module.exports = exports` and the entire module is
wrapped in an IIFE, the resulting `export=` symbol, after following
aliases, is the module itself. This results in trying to merge the
file's exports with itself inside `getCommonJsExportEquals`, since it
thinks that it has found new exports, possibly in an object literal,
that need to be merged with the file's exports.
For example:
```js
(function() {
exports.a = 1
module.exports = exports
})()
```
1. Merge enum with expando.
2. Merge enum member with property assignment.
3. Merge interface-declared method declaration with
prototype-property-assignment method declaration.
The reason that the enum merges crash is that getTypeOfSymbol assumes
that symbol flags are (basically) mutually exclusive. This assumption is
shredded, badly, for JS merges.
One fix is to drop the assumption of exclusivity and instead order cases
by least to most likely. This has the highest chance of working, but is
also slow, since you would prefer to order cases by most likely *first*,
not *last*.
The other fix, which is what I did here, is to add a last-chance
re-dispatch at the bottom of
`getTypeOfVariableOrParameterOrPropertyWorker`. This dispatch uses the
valueDeclaration instead of the symbol flags.
* Unify JSX Call Checking Codepaths
* Add tests for fixed issues
* Fix lint, move all error checking into the only-run-once resolveSignature call
* Remove unused (unreachable?) code path
* Consolidate a little more duplicated logic into signature checking
* Fix#19775 a bit more
* Cosmetic changes from CR
* Add helpers that understand constructor functions
* getEffectiveConstructSignatures gets construct signatures from type, and
call signatures from constructor functions if there are no construct
signatures.
* getEffectiveConstructSignatureReturnType gets the "JS Class type" for
constructor functions, and the return type of signatures for all other
declarations.
This is a first step toward making constructor functions have construct
signatures instead of call signatures, which will also contribute to
fixing instantiation of generic constructor functions, which is basically
broken right now.
Note that the baselines *improve* but, because of the previously
mentioned generic problem, are still not correct. Construct signatures
for constructor functions and generic constructor functions turns out to
be an intertwined problem.
* Correct correct originalBaseType
And, for now, return anyType for generic constructor functions used as
base types. Don't give an incorrect error based on the function's return
type, which is usually void.
* Add error examples to tests
* Add construct signatures instead of getEffective* functions
* Fix typo in baseline
* Remove pesky newline
I thought I got rid of it!
* Test of constructor tag on object literal method
It doesn't work, and shouldn't in the future, because it's a runtime
error.