{"record":{"id":"f7b21058b7b9f318","repo":"microsoft/playwright","slug":"not-engine-expects-non-empty-selector-list","errorCode":null,"errorMessage":"\"not\" engine expects non-empty selector list","messagePattern":"\"not\" engine expects non-empty selector list","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/injected/src/selectorEvaluator.ts","lineNumber":439,"sourceCode":"\n  query(context: QueryContext, args: (string | number | Selector)[], evaluator: SelectorEvaluator): Element[] {\n    if (args.length !== 0)\n      throw new Error(`\"scope\" engine expects no arguments`);\n    const actualScope = context.originalScope || context.scope;\n    if (actualScope.nodeType === 9 /* Node.DOCUMENT_NODE */) {\n      const root = (actualScope as Document).documentElement;\n      return root ? [root] : [];\n    }\n    if (actualScope.nodeType === 1 /* Node.ELEMENT_NODE */)\n      return [actualScope as Element];\n    return [];\n  },\n};\n\nconst notEngine: SelectorEngine = {\n  matches(element: Element, args: (string | number | Selector)[], context: QueryContext, evaluator: SelectorEvaluator): boolean {\n    if (args.length === 0)\n      throw new Error(`\"not\" engine expects non-empty selector list`);\n    return !evaluator.matches(element, args, context);\n  },\n};\n\nconst lightEngine: SelectorEngine = {\n  query(context: QueryContext, args: (string | number | Selector)[], evaluator: SelectorEvaluator): Element[] {\n    return evaluator.query({ ...context, pierceShadow: false }, args);\n  },\n\n  matches(element: Element, args: (string | number | Selector)[], context: QueryContext, evaluator: SelectorEvaluator): boolean {\n    return evaluator.matches(element, args, { ...context, pierceShadow: false });\n  }\n};\n\nconst visibleEngine: SelectorEngine = {\n  matches(element: Element, args: (string | number | Selector)[], context: QueryContext, evaluator: SelectorEvaluator): boolean {\n    if (args.length)\n      throw new Error(`\"visible\" engine expects no arguments`);","sourceCodeStart":421,"sourceCodeEnd":457,"githubUrl":"https://github.com/microsoft/playwright/blob/c8fc3bf8d31542d59b4d4d9eaab1df93ff541dc6/packages/injected/src/selectorEvaluator.ts#L421-L457","documentation":"Error \"\"not\" engine expects non-empty selector list\" thrown in microsoft/playwright.","triggerScenarios":"Thrown at packages/injected/src/selectorEvaluator.ts:439 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"c8fc3bf8d31542d59b4d4d9eaab1df93ff541dc6","analyzedAt":"2026-08-12T07:26:36.950Z","schemaVersion":2},"datasetVersion":"2026-08-12T13:17:24.610Z"}