Use native private members in core tooling

[Bharat Middha (bmiddha)]

Summary

• convert TypeScript-private fields, methods, and accessors across API Extractor, API Documenter, and core shared libraries to ECMAScript #private members
• replace private-member destructuring with direct private access
• retain node-core-library TypeScript-private members whose rolled-up declarations are consumed by ES5-target fixtures, where native private declarations fail with TS18028
• keep package behavior and public APIs unchanged

Validation

• built the full affected dependency graph, including about 187 downstream projects
• tested all 15 affected packages with test suites

Dependency

Stacked on #5947, which fixes @rushstack/no-new-null handling for ECMAScript private members. Narrow suppressions remain because these packages consume the released decoupled plugin; they can be removed after the patched plugin is published and adopted.

[Copilot]

Pull request overview

Migrates internal TypeScript-private members to native ECMAScript #private members without changing public APIs or behavior.

Changes:

• Converts private fields, methods, and accessors across 15 tooling packages.
• Replaces private-member destructuring with direct access.
• Adds narrow ESLint suppressions pending the dependency update.

Reviewed changes

Copilot reviewed 111 out of 111 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
repo-scripts/doc-plugin-rush-stack/src/RushStackFeature.ts	Migrates navigation state and helper.
libraries/ts-command-line/src/test/test-cli/WidgetCommandLine.ts	Migrates test CLI state.
libraries/ts-command-line/src/test/test-cli/RunAction.ts	Migrates test action state.
libraries/ts-command-line/src/test/test-cli/PushAction.ts	Migrates test action parameters.
libraries/ts-command-line/src/test/ScopedCommandLineAction.test.ts	Migrates scoped-action test fields.
libraries/ts-command-line/src/test/ConflictingCommandLineParser.test.ts	Migrates parser test fields.
libraries/ts-command-line/src/test/CommandLineParser.test.ts	Migrates parser test flag.
libraries/ts-command-line/src/test/AliasedCommandLineAction.test.ts	Migrates alias test fields.
libraries/ts-command-line/src/providers/TabCompletionAction.ts	Migrates completion state and helpers.
libraries/ts-command-line/src/providers/ScopedCommandLineAction.ts	Migrates scoped parser internals.
libraries/ts-command-line/src/providers/CommandLineParser.ts	Migrates parser internals.
libraries/ts-command-line/src/providers/CommandLineAction.ts	Migrates action parser storage.
libraries/ts-command-line/src/providers/AliasCommandLineAction.ts	Migrates alias parameter map.
libraries/ts-command-line/src/parameters/CommandLineStringParameter.ts	Migrates string value storage.
libraries/ts-command-line/src/parameters/CommandLineStringListParameter.ts	Migrates string-list storage.
libraries/ts-command-line/src/parameters/CommandLineRemainder.ts	Migrates remainder storage.
libraries/ts-command-line/src/parameters/CommandLineIntegerParameter.ts	Migrates integer value storage.
libraries/ts-command-line/src/parameters/CommandLineIntegerListParameter.ts	Migrates integer-list storage.
libraries/ts-command-line/src/parameters/CommandLineFlagParameter.ts	Migrates flag storage.
libraries/ts-command-line/src/parameters/CommandLineChoiceParameter.ts	Migrates choice value storage.
libraries/ts-command-line/src/parameters/CommandLineChoiceListParameter.ts	Migrates choice-list storage.
libraries/ts-command-line/src/parameters/BaseClasses.ts	Migrates short-name storage.
libraries/tree-pattern/src/TreePattern.ts	Migrates stored tree pattern.
libraries/terminal/src/TextRewriterTransform.ts	Migrates rewriter state and helpers.
libraries/terminal/src/test/ProblemCollector.test.ts	Migrates matcher test regex.
libraries/terminal/src/TerminalWritable.ts	Migrates open-state tracking.
libraries/terminal/src/TerminalTable.ts	Migrates table state and destructuring.
libraries/terminal/src/TerminalStreamWritable.ts	Migrates stream write callback.
libraries/terminal/src/Terminal.ts	Migrates providers and write helpers.
libraries/terminal/src/StringBufferTerminalProvider.ts	Migrates output buffers.
libraries/terminal/src/StdioSummarizer.ts	Migrates summarizer state.
libraries/terminal/src/StdioLineTransform.ts	Migrates accumulated-line state.
libraries/terminal/src/SplitterTransform.ts	Migrates destination set.
libraries/terminal/src/ProblemCollector.ts	Migrates matcher and problem state.
libraries/terminal/src/PrefixProxyTerminalProvider.ts	Migrates prefix-provider state.
libraries/terminal/src/DiscardStdoutTransform.ts	Migrates transform state.
libraries/terminal/src/CallbackWritable.ts	Migrates callback storage.
libraries/stream-collator/src/StreamCollator.ts	Migrates collator state and helpers.
libraries/stream-collator/src/CollatedWriter.ts	Migrates writer internals.
libraries/stream-collator/src/CollatedTerminal.ts	Migrates destination storage.
libraries/rig-package/src/RigConfig.ts	Migrates resolved-path caches.
libraries/package-extractor/src/SymlinkAnalyzer.ts	Migrates analysis caches.
libraries/package-extractor/src/scripts/createLinks/cli/CreateLinksCommandLineParser.ts	Migrates CLI terminal storage.
libraries/package-extractor/src/scripts/createLinks/cli/actions/RemoveLinksAction.ts	Migrates action terminal storage.
libraries/package-extractor/src/scripts/createLinks/cli/actions/CreateLinksAction.ts	Migrates action state.
libraries/package-extractor/src/PackageExtractor.ts	Migrates extraction helpers.
libraries/package-extractor/src/AssetHandler.ts	Migrates asset state and helper.
libraries/package-extractor/src/ArchiveManager.ts	Migrates archive storage.
libraries/operation-graph/src/WorkQueue.ts	Migrates queue and signal state.
libraries/operation-graph/src/WatchLoop.ts	Migrates watch-loop state and helpers.
libraries/operation-graph/src/Stopwatch.ts	Migrates timing state.
libraries/operation-graph/src/OperationGroupRecord.ts	Migrates group execution state.
libraries/operation-graph/src/OperationExecutionManager.ts	Migrates manager state.
libraries/operation-graph/src/Operation.ts	Migrates execution state and helper.
libraries/npm-check-fork/src/NpmRegistryClient.ts	Migrates registry configuration.
libraries/module-minifier/src/WorkerPoolMinifier.ts	Migrates worker-pool state.
libraries/module-minifier/src/MessagePortMinifier.ts	Migrates callback map.
libraries/module-minifier/src/LocalMinifier.ts	Migrates local minifier state.
libraries/heft-config-file/src/ProjectConfigurationFile.ts	Migrates path and rig helpers.
libraries/debug-certificate-manager/src/CertificateStore.ts	Migrates certificate paths and caches.
libraries/debug-certificate-manager/src/CertificateManager.ts	Migrates certificate helpers.
libraries/credential-cache/src/CredentialCache.ts	Migrates cache state and validation.
libraries/api-extractor-model/src/model/TypeParameter.ts	Migrates parent storage.
libraries/api-extractor-model/src/model/SourceLocation.ts	Migrates URL components.
libraries/api-extractor-model/src/model/Parameter.ts	Migrates parent storage.
libraries/api-extractor-model/src/model/ModelReferenceResolver.ts	Migrates resolver state and helpers.
libraries/api-extractor-model/src/model/ApiPackage.ts	Migrates package configuration state.
libraries/api-extractor-model/src/model/ApiModel.ts	Migrates resolver and lookup caches.
libraries/api-extractor-model/src/model/ApiInterface.ts	Migrates inherited-interface storage.
libraries/api-extractor-model/src/model/ApiClass.ts	Migrates implemented-interface storage.
libraries/api-extractor-model/src/mixins/Excerpt.ts	Migrates token and text state.
libraries/api-extractor-model/src/items/ApiItem.ts	Migrates parent and reference caches.
libraries/api-extractor-model/src/items/ApiDocumentedItem.ts	Migrates TSDoc storage.
libraries/api-extractor-model/src/items/ApiDeclaredItem.ts	Migrates excerpt and location state.
apps/api-extractor/src/collector/SourceMapper.ts	Migrates source-map caches with suppressions.
apps/api-extractor/src/collector/CollectorEntity.ts	Migrates export metadata state.
apps/api-extractor/src/cli/RunAction.ts	Migrates CLI parameters.
apps/api-extractor/src/cli/ApiExtractorCommandLine.ts	Migrates debug state and helper.
apps/api-extractor/src/api/ExtractorMessage.ts	Migrates message state.
apps/api-extractor/src/api/ExtractorConfig.ts	Migrates report lookup helper.
apps/api-extractor/src/analyzer/PackageMetadataManager.ts	Migrates metadata caches.
apps/api-extractor/src/analyzer/AstSymbol.ts	Migrates symbol analysis state.
apps/api-extractor/src/analyzer/AstDeclaration.ts	Migrates declaration analysis state.
apps/api-documenter/src/plugin/MarkdownDocumenterAccessor.ts	Migrates implementation storage.
apps/api-documenter/src/nodes/DocTableRow.ts	Migrates table-cell storage.
apps/api-documenter/src/nodes/DocTable.ts	Migrates table-row storage.
apps/api-documenter/src/markdown/CustomMarkdownEmitter.ts	Migrates model storage.
apps/api-documenter/src/documenters/OfficeYamlDocumenter.ts	Migrates Office documenter state.
apps/api-documenter/src/documenters/ExperimentalYamlDocumenter.ts	Migrates TOC state and helpers.
apps/api-documenter/src/cli/YamlAction.ts	Migrates YAML CLI parameters.
apps/api-documenter/src/cli/BaseAction.ts	Migrates shared parameters and helpers.
apps/api-documenter/src/cli/ApiDocumenterCommandLine.ts	Migrates action-population helper.

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