extensions/typescript-language-features/src/languageFeatures/quickFix.ts/SupportedCodeActionProvider/getFixableDiagnosticsForContext
class SupportedCodeActionProvider:	public async getFixableDiagnosticsForContext(context: vscode.CodeActionContext): Promise<DiagnosticsSet> {
		const fixableCodes = await this.fixableDiagnosticCodes;
		return DiagnosticsSet.from(
			context.diagnostics.filter(diagnostic => typeof diagnostic.code !== 'undefined' && fixableCodes.has(diagnostic.code + '')));
	}