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What Playwright’s reporter API provides
Playwright lets you implement a custom reporter as a class with optional reporter methods and export that class as the module’s default. As the official Reporter API documentation puts it, “All methods of the reporter are optional.” That means a reporter can implement only the hooks needed for its job.
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For a run-memory design, the most relevant hooks are onBegin, onTestEnd, and onEnd. The first can initialize run-level context, onTestEnd receives a completed test result, and onEnd runs after tests finish. Playwright awaits a promise returned by onEnd, making it a practical place to finish writing a summary or attempt a configured handoff. The API also documents onExit as a later hook immediately before the runner exits; it is not a substitute for deciding explicitly when summary generation should happen.
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Reporter API methods have version annotations: methods are documented as available since v1.10, onExit since v1.33, optional worker information for onError since v1.60, and preprocess since v1.62. These are introduction versions, not a guarantee that a particular project’s installed Playwright release supports every method. Check the API documentation against the version in your project.
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How a run-memory reporter could work
- Start a run record. In
onBegin, create a run identifier and record only the metadata needed to interpret results, such as the start time and selected project or configuration information. - Capture completed tests. In
onTestEnd, select fields useful for debugging: stable test identity, status, relevant error details, and selected step information. Keep the record bounded; retaining every trace, attachment, or full error payload indefinitely can create an unwieldy history and expose data you did not intend to send elsewhere. - Persist the history deliberately. Write selected records to a local file or another storage system chosen for your project. Playwright’s reporter hooks provide event data; they do not promise cross-run storage or define a history format.
- Build the brief after test completion. In
onEnd, compare the current run with the retained records and produce a compact summary—for example, newly failing tests, recurring failures, and the most relevant error or step context. This summarization policy is your design, not a Playwright-provided diagnosis. - Choose an explicit assistant handoff. If the brief should reach a coding assistant, configure that integration yourself. The cited Playwright documentation does not establish a supported connection to any named assistant. A local file that a developer can inspect or provide is a separate, simpler handoff than an automated request to an external service.
Choose the right reporter output and configuration
Playwright includes built-in reporters for different output needs, including terminal-oriented output and JSON. The reporters guide explains that built-in and custom reporters can be used together; JSON output can coexist with terminal output. A custom reporter that does not write to the terminal can implement printsToStdio() to return false, allowing Playwright to use a standard terminal reporter as well.
You can configure a reporter in Playwright’s test configuration or pass a reporter file path through the CLI. The official reporters documentation source covers combining reporter options. The practical choice depends on what you need to preserve:
| Approach | Best suited to | What it does not establish by itself |
|---|---|---|
| Terminal-oriented built-in reporter | Readable feedback while a run is in progress or immediately afterward. | Persistent history across separate invocations or an assistant handoff. |
| Built-in JSON reporter | Structured output that another tool or script can process. | A curated long-term history, failure interpretation, or a connection to an assistant. |
| Custom reporter | Project-specific selection, persistence, and summary logic built around reporter events. | Storage reliability or a supported assistant service integration; those require implementation choices. |
Design for failures and merged reports
Handle reporter errors explicitly
Playwright’s API documentation says errors thrown by reporter methods are swallowed unless the reporter handles them itself. If saving history fails or an assistant request is rejected, capture and report that failure deliberately; otherwise the test run’s ordinary output may not make the reporter problem clear. Decide whether a failed handoff should merely warn, preserve the brief locally for retry, or affect your workflow. Avoid letting an optional assistant request silently become the only record of a run.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Do not treat a project name as a unique run or shard identifier
When Playwright merges blob reports, the Reporter API runs on the merged reports, and projects from different shards remain separate TestProject objects—even if they share a name. A history key should therefore not assume that a project name alone identifies a shard or run. Include identifiers appropriate to your own run and shard model.
What this concept does—and does not—promise
The Reporter API supplies lifecycle hooks and configuration mechanisms that can support collecting results and producing a brief. It does not supply persistent run memory, choose which failures matter, guarantee that a brief explains a failure correctly, or provide a documented integration with a named assistant. An anecdotal community post describes its author’s AI-powered reporter, but that post is not evidence of verified accuracy, broad adoption, or commercial availability.
Judge an implementation by whether it retains the context your team actually uses, bounds and protects that history, handles merged and sharded results correctly, and makes failures in persistence or handoff visible. No adoption, time-saved, or AI-diagnosis-quality statistic is established by the cited sources.
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