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Fix typedef binding with CJS exports= #826

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6f540b2
Fix typedef binding with CJS `exports=`
sandersn Apr 25, 2025
b8bc147
remove TODO that is now done
sandersn Apr 28, 2025
5d2d999
Merge branch 'main' into fix-typedef-export
sandersn Apr 28, 2025
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32 changes: 31 additions & 1 deletion internal/binder/binder.go
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Expand Up @@ -73,6 +73,7 @@ type Binder struct {
flowNodePool core.Pool[ast.FlowNode]
flowListPool core.Pool[ast.FlowList]
singleDeclarationsPool core.Pool[*ast.Node]
delayedTypeAliases []*ast.Node
}

type ActiveLabel struct {
Expand Down Expand Up @@ -124,9 +125,32 @@ func bindSourceFile(file *ast.SourceFile, options *core.SourceFileAffectingCompi
b.bind(file.AsNode())
file.SymbolCount = b.symbolCount
file.ClassifiableNames = b.classifiableNames
b.delayedBindJSDocTypedefTag()
})
}

// top-level typedef binding is delayed because it changes based on whether `module.exports = x` is bound
func (b *Binder) delayedBindJSDocTypedefTag() {
if b.delayedTypeAliases == nil {
return
}
if b.file.Symbol != nil {
if exportEq := b.file.Symbol.Exports[ast.InternalSymbolNameExportEquals]; exportEq != nil && b.file.CommonJSModuleIndicator != nil {
for _, node := range b.delayedTypeAliases {
b.declareSymbol(ast.GetSymbolTable(&exportEq.Exports), exportEq /*parent*/, node, ast.SymbolFlagsTypeAlias, ast.SymbolFlagsTypeAliasExcludes)
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@weswigham weswigham Apr 26, 2025 •
edited
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This works for one level of indirection to a local namespace-y thing, but what about an aliased namespacey thing? Eg

const mod = require("./mod.js")
/**
* @typedef {string} T
*/
module.exports = mod

or, abusing a ts construct to do it locally,

namespace ns {
  export namespace inner {}
}
import mod = ns.inner
/**
* @typedef {string} T
*/
module.exports = mod

mod's symbol will be an alias, and this will just patch the typedefs onto the alias symbol, and not the alias symbol's ultimate target, which, dollars to donuts, means it's going to effectively go missing without extra lookup logic in the checker, similar to what we used to have. 🥹

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@sandersn sandersn Apr 28, 2025 •
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Even simpler, this also reproduces the problem.

function f() { }
/** @typedef {string} T */
module.exports = f

b.declareSymbol(ast.GetLocals(b.file.AsNode()), b.file.Symbol, node, ast.SymbolFlagsTypeAlias, ast.SymbolFlagsTypeAliasExcludes)
}
return
}
}
// bind normally
b.container = b.file.AsNode()
b.blockScopeContainer = b.file.AsNode()
for _, node := range b.delayedTypeAliases {
b.bindBlockScopedDeclaration(node, ast.SymbolFlagsTypeAlias, ast.SymbolFlagsTypeAliasExcludes)
}
}

func (b *Binder) newSymbol(flags ast.SymbolFlags, name string) *ast.Symbol {
b.symbolCount++
result := b.symbolPool.New()
Expand Down Expand Up @@ -686,8 +710,14 @@ func (b *Binder) bind(node *ast.Node) bool {
b.bindBlockScopedDeclaration(node, ast.SymbolFlagsInterface, ast.SymbolFlagsInterfaceExcludes)
case ast.KindCallExpression:
b.bindCallExpression(node)
case ast.KindTypeAliasDeclaration, ast.KindJSTypeAliasDeclaration:
case ast.KindTypeAliasDeclaration:
b.bindBlockScopedDeclaration(node, ast.SymbolFlagsTypeAlias, ast.SymbolFlagsTypeAliasExcludes)
case ast.KindJSTypeAliasDeclaration:
if b.file.AsNode() == b.container {
b.delayedTypeAliases = append(b.delayedTypeAliases, node)
} else {
b.bindBlockScopedDeclaration(node, ast.SymbolFlagsTypeAlias, ast.SymbolFlagsTypeAliasExcludes)
}
case ast.KindEnumDeclaration:
b.bindEnumDeclaration(node)
case ast.KindModuleDeclaration:
Expand Down
1 change: 0 additions & 1 deletion internal/parser/reparser.go
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,6 @@ func (p *Parser) reparseTags(parent *ast.Node, jsDoc []*ast.Node) {
for _, tag := range j.AsJSDoc().Tags.Nodes {
switch tag.Kind {
case ast.KindJSDocTypedefTag:
// !!! Don't mark typedefs as exported if they are not in a module
typeExpression := tag.AsJSDocTypedefTag().TypeExpression
if typeExpression == nil {
break
Expand Down
21 changes: 0 additions & 21 deletions testdata/baselines/reference/submodule/compiler/checkJsTypeDefNoUnusedLocalMarked.errors.txt
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7 changes: 1 addition & 6 deletions testdata/baselines/reference/submodule/compiler/expandoFunctionContextualTypesJs.errors.txt
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@@ -1,11 +1,10 @@
input.js(5,48): error TS2304: Cannot find name 'P'.
input.js(48,1): error TS2309: An export assignment cannot be used in a module with other exported elements.
input.js(52,17): error TS2322: Type '{ color: string; }' is not assignable to type '{ color: "blue" | "red"; }'.
Types of property 'color' are incompatible.
Type 'string' is not assignable to type '"blue" | "red"'.


==== input.js (3 errors) ====
==== input.js (2 errors) ====
/** @typedef {{ color: "red" | "blue" }} MyComponentProps */

/**
Expand Down Expand Up @@ -56,12 +55,8 @@ input.js(52,17): error TS2322: Type '{ color: string; }' is not assignable to ty
* @type {MyComponentProps}
*/
module.exports = {
~~~~~~~~~~~~~~~~~~
color: "red"
~~~~~~~~~~~~~~~~
}
~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.

expectLiteral({ props: module.exports });
~~~~~
Expand Down
5 changes: 1 addition & 4 deletions ...odule/compiler/jsDeclarationEmitExportAssignedFunctionWithExtraTypedefsMembers.errors.txt
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@@ -1,8 +1,7 @@
index.js(9,1): error TS2309: An export assignment cannot be used in a module with other exported elements.
index.js(9,34): error TS7006: Parameter 'options' implicitly has an 'any' type.


==== index.js (2 errors) ====
==== index.js (1 errors) ====
/**
* @typedef Options
* @property {string} opt
Expand All @@ -12,8 +11,6 @@ index.js(9,34): error TS7006: Parameter 'options' implicitly has an 'any' type.
* @param {Options} options
*/
module.exports = function loader(options) {}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.
~~~~~~~
!!! error TS7006: Parameter 'options' implicitly has an 'any' type.

5 changes: 1 addition & 4 deletions .../submodule/compiler/moduleExportsTypeNoExcessPropertyCheckFromContainedLiteral.errors.txt
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@@ -1,5 +1,4 @@
typescript-eslint.js(12,17): error TS7019: Rest parameter 'configs' implicitly has an 'any[]' type.
typescript-eslint.js(14,1): error TS2309: An export assignment cannot be used in a module with other exported elements.


==== eslint.config.js (0 errors) ====
Expand All @@ -26,7 +25,7 @@ typescript-eslint.js(14,1): error TS2309: An export assignment cannot be used in
},
};

==== typescript-eslint.js (2 errors) ====
==== typescript-eslint.js (1 errors) ====
/**
* @typedef {{ rules: Record<string, boolean> }} Plugin
*/
Expand All @@ -43,6 +42,4 @@ typescript-eslint.js(14,1): error TS2309: An export assignment cannot be used in
!!! error TS7019: Rest parameter 'configs' implicitly has an 'any[]' type.

module.exports = { config };
~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.

4 changes: 2 additions & 2 deletions testdata/baselines/reference/submodule/conformance/importingExportingTypes.symbols
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Expand Up @@ -28,10 +28,10 @@ import { writeFile, WriteFileOptions, WriteFileOptions as OtherName } from "fs";
/** @typedef {{ x: any }} JSDocType */

export { JSDocType };
>JSDocType : Symbol(JSDocType, Decl(index.js, 2, 4), Decl(index.js, 4, 8))
>JSDocType : Symbol(JSDocType, Decl(index.js, 4, 8), Decl(index.js, 2, 4))

export { JSDocType as ThisIsFine };
>JSDocType : Symbol(JSDocType, Decl(index.js, 2, 4), Decl(index.js, 4, 8))
>JSDocType : Symbol(JSDocType, Decl(index.js, 4, 8), Decl(index.js, 2, 4))
>ThisIsFine : Symbol(ThisIsFine, Decl(index.js, 5, 8))

export { WriteFileOptions };
Expand Down
15 changes: 0 additions & 15 deletions testdata/baselines/reference/submodule/conformance/importingExportingTypes.symbols.diff
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10 changes: 2 additions & 8 deletions ...ference/submodule/conformance/jsDeclarationsFunctionClassesCjsExportAssignment.errors.txt
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Expand Up @@ -2,9 +2,7 @@ context.js(4,14): error TS1340: Module './timer' does not refer to a type, but i
context.js(5,14): error TS1340: Module './hook' does not refer to a type, but is used as a type here. Did you mean 'typeof import('./hook')'?
context.js(6,31): error TS2694: Namespace 'Hook' has no exported member 'HookHandler'.
context.js(34,14): error TS2350: Only a void function can be called with the 'new' keyword.
context.js(48,1): error TS2309: An export assignment cannot be used in a module with other exported elements.
hook.js(2,20): error TS1340: Module './context' does not refer to a type, but is used as a type here. Did you mean 'typeof import('./context')'?
hook.js(10,1): error TS2309: An export assignment cannot be used in a module with other exported elements.


==== timer.js (0 errors) ====
Expand All @@ -15,7 +13,7 @@ hook.js(10,1): error TS2309: An export assignment cannot be used in a module wit
this.timeout = timeout;
}
module.exports = Timer;
==== hook.js (2 errors) ====
==== hook.js (1 errors) ====
/**
* @typedef {(arg: import("./context")) => void} HookHandler
~~~~~~~~~~~~~~~~~~~
Expand All @@ -28,10 +26,8 @@ hook.js(10,1): error TS2309: An export assignment cannot be used in a module wit
this.handle = handle;
}
module.exports = Hook;
~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.

==== context.js (5 errors) ====
==== context.js (4 errors) ====
/**
* Imports
*
Expand Down Expand Up @@ -88,6 +84,4 @@ hook.js(10,1): error TS2309: An export assignment cannot be used in a module wit
}
}
module.exports = Context;
~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.

5 changes: 4 additions & 1 deletion ...eference/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespace.errors.txt
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Expand Up @@ -3,12 +3,13 @@ file.js(10,51): error TS2300: Duplicate identifier 'myTypes'.
file.js(13,13): error TS2300: Duplicate identifier 'myTypes'.
file.js(18,15): error TS2702: 'myTypes' only refers to a type, but is being used as a namespace here.
file.js(18,39): error TS2300: Duplicate identifier 'myTypes'.
file.js(20,9): error TS2300: Duplicate identifier 'myTypes'.
file2.js(6,11): error TS2315: Type 'Object' is not generic.
file2.js(12,23): error TS2702: 'myTypes' only refers to a type, but is being used as a namespace here.
file2.js(17,12): error TS2702: 'testFnTypes' only refers to a type, but is being used as a namespace here.


==== file.js (5 errors) ====
==== file.js (6 errors) ====
/**
* @namespace myTypes
* @global
Expand Down Expand Up @@ -39,6 +40,8 @@ file2.js(17,12): error TS2702: 'testFnTypes' only refers to a type, but is being
!!! error TS2300: Duplicate identifier 'myTypes'.

export {myTypes};
~~~~~~~
!!! error TS2300: Duplicate identifier 'myTypes'.
==== file2.js (3 errors) ====
import {myTypes} from './file.js';

Expand Down
4 changes: 2 additions & 2 deletions ...s/reference/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespace.symbols
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Expand Up @@ -23,7 +23,7 @@ const myTypes = {
/** @typedef {myTypes.typeB|Function} myTypes.typeC */

export {myTypes};
>myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 19, 8))
>myTypes : Symbol(myTypes, Decl(file.js, 19, 8), Decl(file.js, 9, 4))

=== file2.js ===
import {myTypes} from './file.js';
Expand Down Expand Up @@ -65,5 +65,5 @@ function testFn(input) {

export {testFn, testFnTypes};
>testFn : Symbol(testFn, Decl(file2.js, 27, 8))
>testFnTypes : Symbol(testFnTypes, Decl(file2.js, 11, 4), Decl(file2.js, 27, 15))
>testFnTypes : Symbol(testFnTypes, Decl(file2.js, 27, 15), Decl(file2.js, 11, 4))

4 changes: 2 additions & 2 deletions ...erence/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespace.symbols.diff
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Expand Up @@ -14,7 +14,7 @@

export {myTypes};
->myTypes : Symbol(myTypes, Decl(file.js, 19, 8), Decl(file.js, 9, 50), Decl(file.js, 12, 12), Decl(file.js, 17, 38))
+>myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 19, 8))
+>myTypes : Symbol(myTypes, Decl(file.js, 19, 8), Decl(file.js, 9, 4))

=== file2.js ===
import {myTypes} from './file.js';
Expand All @@ -32,5 +32,5 @@
export {testFn, testFnTypes};
>testFn : Symbol(testFn, Decl(file2.js, 27, 8))
->testFnTypes : Symbol(testFnTypes, Decl(file2.js, 27, 15), Decl(file2.js, 11, 37))
+>testFnTypes : Symbol(testFnTypes, Decl(file2.js, 11, 4), Decl(file2.js, 27, 15))
+>testFnTypes : Symbol(testFnTypes, Decl(file2.js, 27, 15), Decl(file2.js, 11, 4))

12 changes: 6 additions & 6 deletions ...rence/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespaceCjs.errors.txt
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Expand Up @@ -3,13 +3,13 @@ file.js(10,51): error TS2300: Duplicate identifier 'myTypes'.
file.js(13,13): error TS2300: Duplicate identifier 'myTypes'.
file.js(18,15): error TS2702: 'myTypes' only refers to a type, but is being used as a namespace here.
file.js(18,39): error TS2300: Duplicate identifier 'myTypes'.
file.js(20,9): error TS2300: Duplicate identifier 'myTypes'.
file2.js(6,11): error TS2315: Type 'Object' is not generic.
file2.js(12,23): error TS2702: 'myTypes' only refers to a type, but is being used as a namespace here.
file2.js(17,12): error TS2702: 'testFnTypes' only refers to a type, but is being used as a namespace here.
file2.js(28,1): error TS2309: An export assignment cannot be used in a module with other exported elements.


==== file2.js (4 errors) ====
==== file2.js (3 errors) ====
const {myTypes} = require('./file.js');

/**
Expand Down Expand Up @@ -44,9 +44,7 @@ file2.js(28,1): error TS2309: An export assignment cannot be used in a module wi
}

module.exports = {testFn, testFnTypes};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2309: An export assignment cannot be used in a module with other exported elements.
==== file.js (5 errors) ====
==== file.js (6 errors) ====
/**
* @namespace myTypes
* @global
Expand Down Expand Up @@ -76,4 +74,6 @@ file2.js(28,1): error TS2309: An export assignment cannot be used in a module wi
~~~~~~~
!!! error TS2300: Duplicate identifier 'myTypes'.

exports.myTypes = myTypes;
exports.myTypes = myTypes;
~~~~~~~
!!! error TS2300: Duplicate identifier 'myTypes'.
4 changes: 2 additions & 2 deletions ...eference/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespaceCjs.symbols
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Expand Up @@ -70,8 +70,8 @@ const myTypes = {
/** @typedef {myTypes.typeB|Function} myTypes.typeC */

exports.myTypes = myTypes;
>exports.myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 7, 2))
>exports.myTypes : Symbol(myTypes, Decl(file.js, 7, 2), Decl(file.js, 9, 4))
>exports : Symbol("file", Decl(file.js, 0, 0))
>myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 7, 2))
>myTypes : Symbol(myTypes, Decl(file.js, 7, 2), Decl(file.js, 9, 4))
>myTypes : Symbol(myTypes, Decl(file.js, 5, 5), Decl(file.js, 9, 4), Decl(file.js, 12, 3), Decl(file.js, 17, 4))

4 changes: 2 additions & 2 deletions ...nce/submodule/conformance/jsDeclarationsImportAliasExposedWithinNamespaceCjs.symbols.diff
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Expand Up @@ -39,8 +39,8 @@
->exports : Symbol(myTypes, Decl(file.js, 7, 2))
->myTypes : Symbol(myTypes, Decl(file.js, 7, 2))
->myTypes : Symbol(myTypes, Decl(file.js, 5, 5), Decl(file.js, 9, 50), Decl(file.js, 12, 12), Decl(file.js, 17, 38))
+>exports.myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 7, 2))
+>exports.myTypes : Symbol(myTypes, Decl(file.js, 7, 2), Decl(file.js, 9, 4))
+>exports : Symbol("file", Decl(file.js, 0, 0))
+>myTypes : Symbol(myTypes, Decl(file.js, 9, 4), Decl(file.js, 7, 2))
+>myTypes : Symbol(myTypes, Decl(file.js, 7, 2), Decl(file.js, 9, 4))
+>myTypes : Symbol(myTypes, Decl(file.js, 5, 5), Decl(file.js, 9, 4), Decl(file.js, 12, 3), Decl(file.js, 17, 4))

18 changes: 0 additions & 18 deletions ...data/baselines/reference/submodule/conformance/jsDeclarationsImportTypeBundled.errors.txt
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