feat(47595): allow using private fields in type queries

[a-tarasyuk]

Fixes microsoft/TypeScript#47595

[Copilot]

Pull request overview

Implements private identifiers in indexed-access type queries, including parsing, checking, declaration emit, API exposure, and baselines.

Changes:

• Adds PrivateNameType AST and checker support.
• Resolves private-name indexed accesses safely during declaration emit.
• Adds conformance coverage and updates generated APIs/baselines.

Reviewed changes

Copilot reviewed 37 out of 42 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/tests/cases/conformance/classes/members/privateNames/privateNameInTypeQuery.ts	Adds conformance cases.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.types.diff	Records type convergence.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.types	Updates type baseline.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.symbols.diff	Records symbol convergence.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.symbols	Updates symbol baseline.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.js.diff	Records emit convergence.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.js	Updates JavaScript baseline.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.errors.txt.diff	Records diagnostic convergence.
testdata/baselines/reference/submodule/conformance/privateNamesAndIndexedAccess.errors.txt	Updates diagnostics baseline.
testdata/baselines/reference/conformance/privateNameInTypeQuery.types	Adds type baseline.
testdata/baselines/reference/conformance/privateNameInTypeQuery.symbols	Adds symbol baseline.
testdata/baselines/reference/conformance/privateNameInTypeQuery.js	Adds emit/declaration baseline.
testdata/baselines/reference/conformance/privateNameInTypeQuery.errors.txt	Adds diagnostics baseline.
internal/transformers/tstransforms/typeserializer.go	Handles metadata serialization.
internal/transformers/tstransforms/typeeraser.go	Erases private-name types.
internal/transformers/declarations/transform.go	Resolves declaration-emitted indexed accesses.
internal/printer/printer.go	Prints private-name types.
internal/printer/emitresolver.go	Extends declaration resolver API.
internal/parser/parser.go	Parses private identifiers as types.
internal/nodebuilder/types.go	Adds private-name resolution flag.
internal/ls/inlay_hints.go	Supports inlay-hint display.
internal/checker/utilities.go	Supports comparison and property lookup.
internal/checker/types.go	Defines private-name type flags/data.
internal/checker/nodebuilderimpl.go	Builds and resolves type nodes.
internal/checker/emitresolver.go	Resolves indexed accesses for emit.
internal/checker/checker.go	Implements checking and resolution semantics.
internal/ast/precedence.go	Defines type precedence.
internal/ast/kind_stringer_generated.go	Updates generated kind strings.
internal/ast/kind_generated.go	Adds the AST kind.
internal/ast/ast_generated.go	Adds the Go AST node.
internal/api/encoder/encoder_generated.go	Encodes private-name nodes.
internal/api/encoder/decoder_generated.go	Decodes private-name nodes.
_scripts/ast.json	Defines the generated AST schema.
_packages/native-preview/src/enums/typeFlags.ts	Updates generated type flags.
_packages/native-preview/src/enums/typeFlags.enum.ts	Exposes the new type flag.
_packages/native-preview/src/enums/syntaxKind.ts	Updates generated syntax kinds.
_packages/native-preview/src/enums/syntaxKind.enum.ts	Exposes the new syntax kind.
_packages/native-preview/src/ast/visitor.generated.ts	Visits private-name nodes.
_packages/native-preview/src/ast/is.generated.ts	Adds the node type guard.
_packages/native-preview/src/ast/factory.generated.ts	Adds factory/update functions.
_packages/native-preview/src/ast/ast.generated.ts	Adds the TypeScript AST interface.
_packages/native-preview/src/api/node/protocol.generated.ts	Describes protocol child properties.

Files not reviewed (5)

• internal/api/encoder/decoder_generated.go: Generated file
• internal/api/encoder/encoder_generated.go: Generated file
• internal/ast/ast_generated.go: Generated file
• internal/ast/kind_generated.go: Generated file
• internal/ast/kind_stringer_generated.go: Generated file