{"record":{"id":"2e4449310f8be50a","repo":"microsoft/playwright","slug":"is-engine-expects-non-empty-selector-list","errorCode":null,"errorMessage":"\"is\" engine expects non-empty selector list","messagePattern":"\"is\" engine expects non-empty selector list","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/injected/src/selectorEvaluator.ts","lineNumber":387,"sourceCode":"        }\n      }\n      query(context.scope);\n      return result;\n    });\n  }\n\n  private _getEngine(name: string): SelectorEngine {\n    const engine = this._engines.get(name);\n    if (!engine)\n      throw new Error(`Unknown selector engine \"${name}\"`);\n    return engine;\n  }\n}\n\nconst isEngine: SelectorEngine = {\n  matches(element: Element, args: (string | number | Selector)[], context: QueryContext, evaluator: SelectorEvaluator): boolean {\n    if (args.length === 0)\n      throw new Error(`\"is\" engine expects non-empty selector list`);\n    return args.some(selector => evaluator.matches(element, selector, context));\n  },\n\n  query(context: QueryContext, args: (string | number | Selector)[], evaluator: SelectorEvaluator): Element[] {\n    if (args.length === 0)\n      throw new Error(`\"is\" engine expects non-empty selector list`);\n    let elements: Element[] = [];\n    for (const arg of args)\n      elements = elements.concat(evaluator.query(context, arg));\n    return args.length === 1 ? elements : sortInDOMOrder(elements);\n  },\n};\n\nconst hasEngine: SelectorEngine = {\n  matches(element: Element, args: (string | number | Selector)[], context: QueryContext, evaluator: SelectorEvaluator): boolean {\n    if (args.length === 0)\n      throw new Error(`\"has\" engine expects non-empty selector list`);\n    return evaluator.query({ ...context, scope: element }, args).length > 0;","sourceCodeStart":369,"sourceCodeEnd":405,"githubUrl":"https://github.com/microsoft/playwright/blob/c8fc3bf8d31542d59b4d4d9eaab1df93ff541dc6/packages/injected/src/selectorEvaluator.ts#L369-L405","documentation":"Error \"\"is\" engine expects non-empty selector list\" thrown in microsoft/playwright.","triggerScenarios":"Thrown at packages/injected/src/selectorEvaluator.ts:387 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"}