export async function activate()

in src/goMain.ts [74:227]
119 lines of code
9 McCabe index (conditional complexity)

export async function activate(ctx: vscode.ExtensionContext): Promise<ExtensionAPI | undefined> {
	if (process.env['VSCODE_GO_IN_TEST'] === '1') {
		// Make sure this does not run when running in test.
		return;
	}

	warnIfDuplicateGoExtension();

	setGlobalState(ctx.globalState);
	setWorkspaceState(ctx.workspaceState);
	setEnvironmentVariableCollection(ctx.environmentVariableCollection);

	const cfg = getGoConfig();
	setLogConfig(cfg['logging']);

	WelcomePanel.activate(ctx, goCtx);

	const configGOROOT = getGoConfig()['goroot'];
	if (configGOROOT) {
		// We don't support unsetting go.goroot because we don't know whether
		// !configGOROOT case indicates the user wants to unset process.env['GOROOT']
		// or the user wants the extension to use the current process.env['GOROOT'] value.
		// TODO(hyangah): consider utilizing an empty value to indicate unset?
		await setGOROOTEnvVar(configGOROOT);
	}

	await showDeprecationWarning();
	await updateGoVarsFromConfig(goCtx);

	suggestUpdates();
	offerToInstallLatestGoVersion();
	offerToInstallTools();

	const registerCommand = commands.createRegisterCommand(ctx, goCtx);
	registerCommand('go.languageserver.restart', commands.startLanguageServer);
	registerCommand('go.languageserver.maintain', commands.startGoplsMaintainerInterface);

	await commands.startLanguageServer(ctx, goCtx)(RestartReason.ACTIVATION);

	initCoverageDecorators(ctx);

	registerCommand('go.builds.run', commands.runBuilds);

	const activeDoc = vscode.window.activeTextEditor?.document;
	if (!goCtx.languageServerIsRunning && activeDoc?.languageId === 'go' && isGoPathSet()) {
		// Check mod status so that cache is updated and then run build/lint/vet
		isModSupported(activeDoc.uri).then(() => {
			vscode.commands.executeCommand('go.builds.run', activeDoc, getGoConfig(activeDoc.uri));
		});
	}

	registerCommand('go.environment.status', expandGoStatusBar);

	GoDebugConfigurationProvider.activate(ctx, goCtx);
	GoDebugFactory.activate(ctx);

	goCtx.buildDiagnosticCollection = vscode.languages.createDiagnosticCollection('go');
	ctx.subscriptions.push(goCtx.buildDiagnosticCollection);
	goCtx.lintDiagnosticCollection = vscode.languages.createDiagnosticCollection(
		lintDiagnosticCollectionName(getGoConfig()['lintTool'])
	);
	ctx.subscriptions.push(goCtx.lintDiagnosticCollection);
	goCtx.vetDiagnosticCollection = vscode.languages.createDiagnosticCollection('go-vet');
	ctx.subscriptions.push(goCtx.vetDiagnosticCollection);

	registerCommand('go.gopath', commands.getCurrentGoPath);
	registerCommand('go.goroot', commands.getCurrentGoRoot);
	registerCommand('go.locate.tools', commands.getConfiguredGoTools);
	registerCommand('go.add.tags', commands.addTags);
	registerCommand('go.remove.tags', commands.removeTags);
	registerCommand('go.fill.struct', commands.runFillStruct);
	registerCommand('go.impl.cursor', commands.implCursor);
	registerCommand('go.godoctor.extract', commands.extractFunction);
	registerCommand('go.godoctor.var', commands.extractVariable);
	registerCommand('go.test.cursor', commands.testAtCursor('test'));
	registerCommand('go.test.cursorOrPrevious', commands.testAtCursorOrPrevious('test'));
	registerCommand('go.subtest.cursor', commands.subTestAtCursor('test'));
	registerCommand('go.debug.cursor', commands.testAtCursor('debug'));
	registerCommand('go.debug.subtest.cursor', commands.subTestAtCursor('debug'));
	registerCommand('go.benchmark.cursor', commands.testAtCursor('benchmark'));
	registerCommand('go.test.package', commands.testCurrentPackage(false));
	registerCommand('go.benchmark.package', commands.testCurrentPackage(true));
	registerCommand('go.test.file', commands.testCurrentFile(false));
	registerCommand('go.benchmark.file', commands.testCurrentFile(true));
	registerCommand('go.test.workspace', commands.testWorkspace);
	registerCommand('go.test.previous', commands.testPrevious);
	registerCommand('go.debug.previous', commands.debugPrevious);

	registerCommand('go.test.coverage', toggleCoverageCurrentPackage);
	registerCommand('go.test.showOutput', () => showTestOutput);
	registerCommand('go.test.cancel', () => cancelRunningTests);
	registerCommand('go.import.add', addImport);
	registerCommand('go.add.package.workspace', addImportToWorkspace);
	registerCommand('go.tools.install', commands.installTools);
	registerCommand('go.browse.packages', browsePackages);

	if (isVscodeTestingAPIAvailable && cfg.get<boolean>('testExplorer.enable')) {
		if (cfg.get<boolean>('testExplorer.useBazel')) BazelGoTestExplorer.setup(ctx, goCtx);
		else {
			GoTestExplorer.setup(ctx, goCtx);
			GoRunTestCodeLensProvider.activate(ctx, goCtx);
		}
	}

	GoExplorerProvider.setup(ctx);

	registerCommand('go.test.generate.package', goGenerateTests.generateTestCurrentPackage);
	registerCommand('go.test.generate.file', goGenerateTests.generateTestCurrentFile);
	registerCommand('go.test.generate.function', goGenerateTests.generateTestCurrentFunction);
	registerCommand('go.toggle.test.file', goGenerateTests.toggleTestFile);
	registerCommand('go.debug.startSession', commands.startDebugSession);
	registerCommand('go.show.commands', commands.showCommands);
	registerCommand('go.get.package', goGetPackage);
	registerCommand('go.playground', playgroundCommand);
	registerCommand('go.lint.package', lintCode('package'));
	registerCommand('go.lint.workspace', lintCode('workspace'));
	registerCommand('go.lint.file', lintCode('file'));
	registerCommand('go.vet.package', vetCode(false));
	registerCommand('go.vet.workspace', vetCode(true));
	registerCommand('go.build.package', buildCode(false));
	registerCommand('go.build.workspace', buildCode(true));
	registerCommand('go.install.package', installCurrentPackage);
	registerCommand('go.run.modinit', goModInit);
	registerCommand('go.extractServerChannel', showServerOutputChannel);
	registerCommand('go.workspace.resetState', resetWorkspaceState);
	registerCommand('go.global.resetState', resetGlobalState);
	registerCommand('go.toggle.gc_details', commands.toggleGCDetails);
	registerCommand('go.apply.coverprofile', commands.applyCoverprofile);

	// Go Environment switching commands
	registerCommand('go.environment.choose', chooseGoEnvironment);

	// Survey related commands
	registerCommand('go.survey.showConfig', showSurveyConfig);
	registerCommand('go.survey.resetConfig', resetSurveyConfigs);

	addOnDidChangeConfigListeners(ctx);
	addOnChangeTextDocumentListeners(ctx);
	addOnChangeActiveTextEditorListeners(ctx);
	addOnSaveTextDocumentListeners(ctx);

	vscode.languages.setLanguageConfiguration(GO_MODE.language, {
		wordPattern: /(-?\d*\.\d\w*)|([^`~!@#%^&*()\-=+[{\]}\\|;:'",.<>/?\s]+)/g
	});

	GoTaskProvider.setup(ctx, vscode.workspace);

	// Vulncheck output link provider.
	VulncheckOutputLinkProvider.activate(ctx);
	registerCommand('go.vulncheck.toggle', toggleVulncheckCommandFactory);
	vscode.commands.executeCommand('go.initExtensionAPI', ctx, goCtx);

	return extensionAPI;
}