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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
8021e94
fallback-resolve namespace members on the export= symbol
sandersn May 5, 2025
689d0e7
Merge branch 'main' into fix-typedef-export
sandersn May 5, 2025
1cffb6e
Add JSExportDeclaration
sandersn May 8, 2025
3c5ec18
Revert "Add JSExportDeclaration"
sandersn May 16, 2025
1ba2be7
Merge branch 'main' into fix-typedef-export
sandersn May 16, 2025
b9ab451
Merge branch 'main' into fix-typedef-export
sandersn Jun 25, 2025
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32 changes: 31 additions & 1 deletion internal/binder/binder.go
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Expand Up @@ -72,6 +72,7 @@ type Binder struct {
flowNodePool core.Pool[ast.FlowNode]
flowListPool core.Pool[ast.FlowList]
singleDeclarationsPool core.Pool[*ast.Node]
delayedTypeAliases []*ast.Node
}

func (b *Binder) options() core.SourceFileAffectingCompilerOptions {
Expand Down Expand Up @@ -125,9 +126,32 @@ func bindSourceFile(file *ast.SourceFile) {
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 •
edited
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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 @@ -687,8 +711,14 @@ 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
38 changes: 32 additions & 6 deletions internal/checker/checker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13788,7 +13788,7 @@ func (c *Checker) getTargetOfImportEqualsDeclaration(node *ast.Node, dontResolve
moduleReference = ast.GetExternalModuleImportEqualsDeclarationExpression(node)
}
immediate := c.resolveExternalModuleName(node, moduleReference, false /*ignoreErrors*/)
resolved := c.resolveExternalModuleSymbol(immediate, false /*dontResolveAlias*/)
resolved := c.resolveExternalModuleSymbol(immediate, dontResolveAlias)
c.markSymbolOfAliasDeclarationIfTypeOnly(node, immediate, resolved, false /*overwriteEmpty*/, nil, "")
return resolved
}
Expand Down Expand Up @@ -15061,9 +15061,24 @@ func (c *Checker) resolveEntityName(name *ast.Node, meaning ast.SymbolFlags, ign
}

func (c *Checker) resolveQualifiedName(name *ast.Node, left *ast.Node, right *ast.Node, meaning ast.SymbolFlags, ignoreErrors bool, dontResolveAlias bool, location *ast.Node) *ast.Symbol {
namespace := c.resolveEntityName(left, ast.SymbolFlagsNamespace, ignoreErrors, false /*dontResolveAlias*/, location)
namespace := c.resolveEntityName(left, ast.SymbolFlagsNamespace, true /*ignoreErrors*/, false /*dontResolveAlias*/, location)
if namespace == nil || ast.NodeIsMissing(right) {
return nil
var immediate *ast.Symbol
alias := c.resolveEntityName(left, ast.SymbolFlagsAlias, true /*ignoreErrors*/, true /*dontResolveAlias*/, location)
if alias != nil {
immediate = c.getImmediateAliasedSymbol(alias)
if immediate != nil && !core.Some(immediate.Declarations, func(d *ast.Node) bool { return d.Kind == ast.KindJSExportAssignment }) {
immediate = nil
}
}
if immediate == nil {
if !ignoreErrors {
c.resolveEntityName(left, ast.SymbolFlagsNamespace, ignoreErrors, false /*dontResolveAlias*/, location)
}
return nil
} else {
namespace = immediate
}
}
if namespace == c.unknownSymbol {
return namespace
Expand Down Expand Up @@ -23529,9 +23544,20 @@ func (c *Checker) getTypeFromImportTypeNode(node *ast.Node) *Type {
}
next := core.OrElse(symbolFromModule, symbolFromVariable)
if next == nil {
c.error(current, diagnostics.Namespace_0_has_no_exported_member_1, c.getFullyQualifiedName(currentNamespace, nil), scanner.DeclarationNameToString(current))
links.resolvedType = c.errorType
return links.resolvedType
var symbolFromImmediateModule *ast.Symbol
if currentNamespace == moduleSymbol {
immediateModuleSymbol := c.resolveExternalModuleSymbol(innerModuleSymbol, true /*dontResolveAlias*/)
if immediateModuleSymbol != nil && core.Some(immediateModuleSymbol.Declarations, func(d *ast.Node) bool { return d.Kind == ast.KindJSExportAssignment }) {
symbolFromImmediateModule = c.getSymbol(c.getExportsOfSymbol(immediateModuleSymbol), current.Text(), meaning)
}
}
if symbolFromImmediateModule != nil {
next = symbolFromImmediateModule
} else {
c.error(current, diagnostics.Namespace_0_has_no_exported_member_1, c.getFullyQualifiedName(currentNamespace, nil), scanner.DeclarationNameToString(current))
links.resolvedType = c.errorType
return links.resolvedType
}
}
c.symbolNodeLinks.Get(current).resolvedSymbol = next
c.symbolNodeLinks.Get(current.Parent).resolvedSymbol = next
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 @@ -57,7 +57,6 @@ func (p *Parser) reparseTags(parent *ast.Node, jsDoc []*ast.Node) {
func (p *Parser) reparseUnhosted(tag *ast.Node, parent *ast.Node, jsDoc *ast.Node) {
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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This file was deleted.

61 changes: 0 additions & 61 deletions testdata/baselines/reference/submodule/compiler/expandoFunctionContextualTypesJs.errors.txt
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5 changes: 1 addition & 4 deletions ...odule/compiler/jsDeclarationEmitExportAssignedFunctionWithExtraTypedefsMembers.errors.txt
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Original file line number Diff line number Diff line change
@@ -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 testdata/baselines/reference/submodule/compiler/jsEnumCrossFileExport.errors.txt
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@@ -1,11 +1,10 @@
enumDef.js(16,18): error TS2339: Property 'Blah' does not exist on type '{ Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }'.
index.js(4,17): error TS2503: Cannot find namespace 'Host'.
index.js(8,21): error TS2304: Cannot find name 'Host'.
index.js(13,11): error TS2503: Cannot find namespace 'Host'.
index.js(18,11): error TS2503: Cannot find namespace 'Host'.


==== enumDef.js (1 errors) ====
==== enumDef.js (0 errors) ====
var Host = {};
Host.UserMetrics = {};
/** @enum {number} */
Expand All @@ -22,8 +21,6 @@ index.js(18,11): error TS2503: Cannot find namespace 'Host'.
* @typedef {string}
*/
Host.UserMetrics.Blah = {
~~~~
!!! error TS2339: Property 'Blah' does not exist on type '{ Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }'.
x: 12
}
==== index.js (4 errors) ====
Expand Down
2 changes: 2 additions & 0 deletions testdata/baselines/reference/submodule/compiler/jsEnumCrossFileExport.symbols
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Expand Up @@ -37,9 +37,11 @@ Host.UserMetrics.Action = {
* @typedef {string}
*/
Host.UserMetrics.Blah = {
>Host.UserMetrics.Blah : Symbol(Blah, Decl(enumDef.js, 8, 2))
>Host.UserMetrics : Symbol(UserMetrics, Decl(enumDef.js, 0, 14))
>Host : Symbol(Host, Decl(enumDef.js, 0, 3), Decl(enumDef.js, 10, 3))
>UserMetrics : Symbol(UserMetrics, Decl(enumDef.js, 0, 14))
>Blah : Symbol(Blah, Decl(enumDef.js, 8, 2))

x: 12
>x : Symbol(x, Decl(enumDef.js, 15, 25))
Expand Down
2 changes: 2 additions & 0 deletions testdata/baselines/reference/submodule/compiler/jsEnumCrossFileExport.symbols.diff
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Expand Up @@ -39,9 +39,11 @@
->Host : Symbol(Host, Decl(enumDef.js, 0, 3), Decl(enumDef.js, 0, 14), Decl(enumDef.js, 1, 22), Decl(enumDef.js, 8, 2), Decl(enumDef.js, 10, 21))
->UserMetrics : Symbol(Host.UserMetrics, Decl(enumDef.js, 0, 14), Decl(enumDef.js, 3, 5), Decl(enumDef.js, 15, 5), Decl(enumDef.js, 10, 26))
->Blah : Symbol(Host.UserMetrics.Blah, Decl(enumDef.js, 8, 2), Decl(enumDef.js, 15, 17), Decl(enumDef.js, 13, 3))
+>Host.UserMetrics.Blah : Symbol(Blah, Decl(enumDef.js, 8, 2))
+>Host.UserMetrics : Symbol(UserMetrics, Decl(enumDef.js, 0, 14))
+>Host : Symbol(Host, Decl(enumDef.js, 0, 3), Decl(enumDef.js, 10, 3))
+>UserMetrics : Symbol(UserMetrics, Decl(enumDef.js, 0, 14))
+>Blah : Symbol(Blah, Decl(enumDef.js, 8, 2))

x: 12
>x : Symbol(x, Decl(enumDef.js, 15, 25))
Expand Down
30 changes: 15 additions & 15 deletions testdata/baselines/reference/submodule/compiler/jsEnumCrossFileExport.types
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Expand Up @@ -2,23 +2,23 @@

=== enumDef.js ===
var Host = {};
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }; }
>{} : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }; }
>{} : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }; }

Host.UserMetrics = {};
>Host.UserMetrics = {} : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>{} : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host.UserMetrics = {} : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>{} : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }

/** @enum {number} */
Host.UserMetrics.Action = {
>Host.UserMetrics.Action = { WindowDocked: 1, WindowUndocked: 2, ScriptsBreakpointSet: 3, TimelineStarted: 4,} : { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }
>Host.UserMetrics.Action : { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Action : { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }
>{ WindowDocked: 1, WindowUndocked: 2, ScriptsBreakpointSet: 3, TimelineStarted: 4,} : { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }

Expand Down Expand Up @@ -47,11 +47,11 @@ Host.UserMetrics.Action = {
*/
Host.UserMetrics.Blah = {
>Host.UserMetrics.Blah = { x: 12} : { x: number; }
>Host.UserMetrics.Blah : any
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; }
>Blah : any
>Host.UserMetrics.Blah : { x: number; }
>Host.UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Host : { UserMetrics: { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }; }
>UserMetrics : { Action: { WindowDocked: number; WindowUndocked: number; ScriptsBreakpointSet: number; TimelineStarted: number; }; Blah: { x: number; }; }
>Blah : { x: number; }
>{ x: 12} : { x: number; }

x: 12
Expand Down
5 changes: 1 addition & 4 deletions .../submodule/compiler/moduleExportsTypeNoExcessPropertyCheckFromContainedLiteral.errors.txt
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Original file line number Diff line number Diff line change
@@ -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.

28 changes: 0 additions & 28 deletions testdata/baselines/reference/submodule/conformance/callbackCrossModule.errors.txt
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