Revisit and remove unused code

[jrieken]

We should revisit our source code and remove things we don't use. I have used the https://github.com/jrieken/ts-unused to find symbols we don't use. Take its result with a grain of salt, the results are based on calling reference search and that means some structural typing tricks aren't seen as usage/reference.

out2.txt, out3.txt, out4.txt, out5.txt, out6.txt,
out7.txt

cc @Microsoft/vscode

Found 128 unused symbols with potential for saving 1185 lines of unused code
src/typings/windows-mutex.ts|isActive:9 -> potentially save ~1 lines
src/vs/base/common/errors.ts|getUnexpectedErrorHandler:114 -> potentially save ~3 lines
src/vs/base/common/event.ts|toPromise:254 -> potentially save ~8 lines
src/vs/base/browser/dom.ts|getContentWidth:593 -> potentially save ~5 lines
src/vs/base/browser/builder.ts|domSelect:442 -> potentially save ~11 lines
src/vs/base/browser/builder.ts|name:666 -> potentially save ~5 lines
src/vs/base/browser/builder.ts|parent:1290 -> potentially save ~5 lines
src/vs/base/common/htmlContent.ts|appendMarkdown:30 -> potentially save ~4 lines
src/vs/base/common/color.ts|getContrastRatio:322 -> potentially save ~5 lines
src/vs/base/common/color.ts|isDarker:332 -> potentially save ~4 lines
src/vs/base/common/color.ts|blend:383 -> potentially save ~18 lines
src/vs/base/common/color.ts|green:432 -> potentially save ~1 lines
src/vs/base/common/color.ts|formatRGB:442 -> potentially save ~7 lines
src/vs/base/common/color.ts|formatHSL:454 -> potentially save ~7 lines
src/vs/base/browser/ui/selectBox/selectBox.ts|style:122 -> potentially save ~7 lines
src/vs/base/browser/ui/actionbar/actionbar.ts|blur:171 -> potentially save ~5 lines
src/vs/base/browser/ui/actionbar/actionbar.ts|blur:791 -> potentially save ~5 lines
src/vs/base/browser/ui/button/button.ts|style:103 -> potentially save ~8 lines
src/vs/base/browser/ui/countBadge/countBadge.ts|style:72 -> potentially save ~7 lines
src/vs/base/browser/ui/list/list.ts|IListElementEvent:18 -> potentially save ~5 lines
src/vs/base/browser/ui/list/listWidget.ts|isDOMFocused:901 -> potentially save ~3 lines
src/vs/base/browser/ui/list/listPaging.ts|selectNext:121 -> potentially save ~3 lines
src/vs/base/browser/ui/list/listPaging.ts|selectPrevious:125 -> potentially save ~3 lines
src/vs/base/common/events.ts|PropertyChangeEvent:19 -> potentially save ~13 lines
src/vs/base/common/events.ts|ISelectionEvent:43 -> potentially save ~5 lines
src/vs/base/common/events.ts|IFocusEvent:49 -> potentially save ~5 lines
src/vs/base/common/events.ts|IHighlightEvent:55 -> potentially save ~5 lines
src/vs/base/common/graph.ts|traverse:42 -> potentially save ~7 lines
src/vs/base/common/jsonEdit.ts|removeProperty:10 -> potentially save ~3 lines
src/vs/base/common/parsers.ts|fatal:79 -> potentially save ~3 lines
src/vs/base/common/winjs.polyfill.promise.ts|all:15 -> potentially save ~11 lines
src/vs/base/common/winjs.polyfill.promise.ts|race:27 -> potentially save ~5 lines
src/vs/base/common/winjs.polyfill.promise.ts|reject:37 -> potentially save ~3 lines
src/vs/base/common/diff/diff2.ts|LcsDiff2:52 -> potentially save ~274 lines
src/vs/base/common/diff/diff2.ts|ComputeDiff:133 -> potentially save ~36 lines
src/vs/base/node/config.ts|getValue:205 -> potentially save ~11 lines
src/vs/base/node/id.ts|value:54 -> potentially save ~25 lines
src/vs/base/parts/tree/browser/treeModel.ts|IItemRefreshEvent:225 -> potentially save ~1 lines
src/vs/base/parts/tree/browser/treeModel.ts|render:719 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeModel.ts|onDidDisposeItem:918 -> potentially save ~1 lines
src/vs/base/parts/tree/browser/treeModel.ts|isHighlighted:1137 -> potentially save ~9 lines
src/vs/base/parts/tree/browser/tree.ts|IElementCallback:628 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/tree.ts|ICallback:632 -> potentially save ~1 lines
src/vs/base/parts/tree/browser/treeDefaults.ts|DefaultSorter:405 -> potentially save ~6 lines
src/vs/base/parts/tree/browser/treeViewModel.ts|itemsCount:177 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeViewModel.ts|withItemsInRange:185 -> potentially save ~7 lines
src/vs/base/parts/tree/browser/treeImpl.ts|onDidDispose:83 -> potentially save ~1 lines
src/vs/base/parts/tree/browser/treeImpl.ts|toggleExpansionAll:185 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|isHighlighted:226 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|select:234 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|selectRange:238 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|selectAll:246 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|deselectAll:254 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|isSelected:266 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|selectNext:278 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|selectPrevious:282 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|selectParent:286 -> potentially save ~3 lines
src/vs/base/parts/tree/browser/treeImpl.ts|toggleTrait:350 -> potentially save ~4 lines
src/vs/base/parts/tree/browser/treeImpl.ts|hasTrait:355 -> potentially save ~3 lines
src/vs/base/parts/quickopen/browser/quickOpenWidget.ts|style:349 -> potentially save ~5 lines
src/vs/platform/contextkey/common/contextkey.ts|getValue:431 -> potentially save ~3 lines
src/vs/platform/update/common/update.ts|ExplicitState:20 -> potentially save ~4 lines
src/vs/platform/request/electron-main/requestService.ts|getRawRequest:13 -> potentially save ~3 lines
src/vs/code/node/cliProcessMain.ts|main:176 -> potentially save ~48 lines
src/vs/editor/browser/viewParts/overviewRuler/overviewRulerImpl.ts|getLanesCount:75 -> potentially save ~3 lines
src/vs/editor/browser/viewParts/overviewRuler/overviewRulerImpl.ts|setLanesCount:79 -> potentially save ~7 lines
src/vs/editor/browser/viewParts/overviewRuler/overviewRulerImpl.ts|setThemeType:87 -> potentially save ~7 lines
src/vs/editor/contrib/find/findWidget.ts|focus:950 -> potentially save ~3 lines
src/vs/editor/contrib/find/findController.ts|getHistory:178 -> potentially save ~3 lines
src/vs/editor/contrib/folding/foldingRanges.ts|hidesLine:170 -> potentially save ~3 lines
src/vs/editor/contrib/referenceSearch/referencesModel.ts|nextReference:256 -> potentially save ~15 lines
src/vs/editor/common/model/editableTextModel.ts|setEditableRange:708 -> potentially save ~21 lines
src/vs/platform/opener/common/opener.ts|open:29 -> potentially save ~1 lines
src/vs/editor/contrib/colorPicker/colorPickerWidget.ts|getId:350 -> potentially save ~3 lines
src/vs/editor/browser/services/bulkEdit.ts|progress:304 -> potentially save ~3 lines
src/vs/editor/browser/services/bulkEdit.ts|add:308 -> potentially save ~3 lines
src/vs/editor/browser/services/bulkEdit.ts|finish:328 -> potentially save ~35 lines
src/vs/editor/browser/services/bulkEdit.ts|ariaMessage:364 -> potentially save ~11 lines
src/vs/platform/contextview/browser/contextMenuService.ts|setContainer:25 -> potentially save ~3 lines
src/vs/platform/contextview/browser/contextViewService.ts|setContainer:31 -> potentially save ~3 lines
src/vs/editor/common/modes/supports/tokenization.ts|getThemeTrieElement:205 -> potentially save ~3 lines
src/vs/editor/standalone/browser/quickOpen/quickOpenEditorWidget.ts|isVisible:77 -> potentially save ~3 lines
src/vs/editor/standalone/browser/quickOpen/quickOpenEditorWidget.ts|hide:93 -> potentially save ~5 lines
src/vs/workbench/common/editor.ts|hasOptionsDefined:645 -> potentially save ~3 lines
src/vs/workbench/services/textfile/common/textFileEditorModel.ts|getLastSaveAttemptTime:864 -> potentially save ~3 lines
src/vs/workbench/services/textfile/common/textFileEditorModel.ts|getStat:978 -> potentially save ~3 lines
src/vs/workbench/parts/files/common/editors/fileEditorInput.ts|getPreferredEncoding:97 -> potentially save ~3 lines
src/vs/workbench/browser/editor.ts|getName:78 -> potentially save ~3 lines
src/vs/workbench/browser/editor.ts|getEditors:176 -> potentially save ~3 lines
src/vs/workbench/browser/editor.ts|setEditors:180 -> potentially save ~3 lines
src/vs/workbench/browser/editor.ts|getEditorInputs:184 -> potentially save ~10 lines
src/vs/workbench/parts/files/electron-browser/views/explorerDecorationsProvider.ts|label:17 -> potentially save ~1 lines
src/vs/workbench/common/editor/editorStacksModel.ts|unpin:481 -> potentially save ~20 lines
src/vs/workbench/common/editor/editorStacksModel.ts|getGroup:831 -> potentially save ~5 lines
src/vs/workbench/common/editor/editorStacksModel.ts|closeGroups:921 -> potentially save ~11 lines
src/vs/workbench/browser/parts/editor/editorActions.ts|LABEL:1243 -> potentially save ~1 lines
src/vs/workbench/parts/preferences/common/preferencesModels.ts|findValueMatches:116 -> potentially save ~1 lines
src/vs/workbench/parts/preferences/common/preferencesModels.ts|save:166 -> potentially save ~3 lines
src/vs/workbench/parts/preferences/common/preferencesModels.ts|WorkspaceConfigModel:370 -> potentially save ~137 lines
src/vs/workbench/parts/preferences/browser/preferencesRenderers.ts|collapseAll:366 -> potentially save ~3 lines
src/vs/workbench/parts/preferences/electron-browser/preferencesSearch.ts|filterPreferences:93 -> potentially save ~22 lines
src/vs/workbench/parts/search/common/searchModel.ts|replace:566 -> potentially save ~3 lines
src/vs/workbench/parts/search/common/searchModel.ts|folderCount:610 -> potentially save ~3 lines
src/vs/workbench/parts/search/browser/searchActions.ts|LABEL:191 -> potentially save ~1 lines
src/vs/workbench/parts/search/browser/searchActions.ts|LABEL:206 -> potentially save ~1 lines
src/vs/workbench/services/scm/common/scm.ts|IBaselineResourceProvider:17 -> potentially save ~3 lines
src/vs/workbench/parts/scm/electron-browser/scm.contribution.ts|ID:25 -> potentially save ~1 lines
src/vs/workbench/parts/scm/electron-browser/scm.contribution.ts|LABEL:26 -> potentially save ~1 lines
src/vs/workbench/parts/debug/browser/debugActionItems.ts|blur:141 -> potentially save ~3 lines
src/vs/workbench/parts/markers/common/markersModel.ts|getStatisticsLabel:313 -> potentially save ~9 lines
src/vs/workbench/parts/markers/browser/markersFileDecorations.ts|label:24 -> potentially save ~1 lines
src/vs/workbench/parts/html/browser/webview.ts|activateSelection:32 -> potentially save ~1 lines
src/vs/workbench/parts/html/browser/webviewEditor.ts|HtmlPreviewEditorViewState:21 -> potentially save ~3 lines
src/vs/workbench/parts/extensions/electron-browser/extensionsActions.ts|isEnabled:51 -> potentially save ~3 lines
src/vs/workbench/parts/extensions/browser/extensionEditor.ts|hideFind:382 -> potentially save ~5 lines
src/vs/workbench/parts/output/common/outputLinkComputer.ts|create:180 -> potentially save ~3 lines
src/vs/workbench/parts/terminal/electron-browser/terminalInstance.ts|registerLinkMatcher:383 -> potentially save ~3 lines
src/vs/workbench/parts/terminal/electron-browser/terminalInstance.ts|onData:826 -> potentially save ~15 lines
src/vs/workbench/browser/parts/editor/editorCommands.ts|handler:173 -> potentially save ~3 lines
src/vs/workbench/browser/parts/editor/editorCommands.ts|handler:183 -> potentially save ~3 lines
src/vs/workbench/browser/parts/editor/editorCommands.ts|handler:203 -> potentially save ~14 lines
src/vs/workbench/services/textfile/electron-browser/textFileService.ts|resolveTextContent:55 -> potentially save ~16 lines
src/vs/workbench/parts/update/electron-browser/releaseNotesEditor.ts|getViewState:141 -> potentially save ~5 lines
src/vs/workbench/services/thread/common/threadService.ts|_suppressCompilerUnusedWarning:26 -> potentially save ~1 lines
src/vs/workbench/electron-browser/commands.ts|handler:376 -> potentially save ~4 lines
src/vs/workbench/electron-browser/commands.ts|handler:387 -> potentially save ~4 lines
src/vs/workbench/electron-browser/main.ts|startup:48 -> potentially save ~21 lines
src/vs/workbench/services/search/node/fileSearch.ts|readStdout:365 -> potentially save ~14 lines

[isidorn]

Thanks for this. Done.

[isidorn]

Also it would be great if you could re-generate this list in like a week, so I can do another pass to check if I missed something.

[jrieken]

Sure. Tho it takes roughly 90mins... I'll update later today or tomorrow

[jrieken]

Re-running it right now... This time a reference to a test doesn't count so expect more symbols to be flagged as 🗑

[jrieken]

FYI, I have updated the list with symbols that are only referenced from tests and it's now sorted by save-potential

[dbaeumer]

@jrieken thanks for doing this. I cleaned up my code. Can we for the next run exclude taskConfiguration.ts. It has a lot of false positives since I use structural typing with namespace but a namespace can't implement an interface. These methods are used, although not always referenced directly:

	isEmpty(value: T): boolean;
	assignProperties(target: T, source: T): T;
	fillProperties(target: T, source: T): T;
	fillDefaults(value: T, context: ParseContext): T;
	freeze(value: T): Readonly<T>;

Alternatively I could rewrite everything to use classes and then implement the ParserType which defines all these methods.

[jrieken]

@dbaeumer Sure, exclusion aren't easy to add.

[joaomoreno]

Gotta exclude this:

src/vs/code/node/cliProcessMain.ts -> main:177,1, potentially save ~48 lines

[jrieken]

@bpasero Is it possible that IWorkbenchContribution#getId is just hot air? I don't see a single caller of that method..

[bpasero]

@jrieken yeah, removed via 66f4c0e

[jrieken]

@bpasero Can you take another look at the builder... There is still lot of unused stuff in there, also those that the tool doesn't find because overloads are used, e.g.

public margin(margin: string): Builder;
public margin(top: number, right?: number, bottom?: number, left?: number): Builder;
public margin(top: string, right?: string, bottom?: string, left?: string): Builder;
public margin(top: any, right?: any, bottom?: any, left?: any): Builder {
	if (types.isString(top) && top.indexOf(' ') >= 0) {
		return this.margin.apply(this, top.split(' '));

[bpasero]

@jrieken yeah, though there can be implicit usages because in the doSetAttr method we just dynamically call into the methods depending on the properties passed over. If someone calls attr({ margin: ...}) we end up calling Builder#margin(). I think Builder might need some special treatment to see if it can be replaced with something more straight foward and lightweight...

[jrieken]

into the methods depending on the properties passed over. If someone calls attr({ margin: ...})

😱 no type-safety?

[bpasero]

Dude, builder is from a time where there was no type safety...

[isidorn]

@jrieken assigning to you to decide if this should be closed since it shows up in my inbox tracker query