Class FakeRenderBackend

constructor

• new FakeRenderBackend(options?: FakeRenderBackendOptions): FakeRenderBackend

  Parameters

  • options: FakeRenderBackendOptions = {}

  Returns FakeRenderBackend

OptionalLastCheckCliJob

OptionalLastCheckCliSignal

LastMeasuredTimestamps

OptionalLastMeasureTextJob

OptionalLastMeasureTextSignal

LintCallCount

MeasureTextCallCount

RunCheckCliCallCount

CaptureStills

• CaptureStills(
      job: BackendStillsJob,
      signal?: AbortSignal,
  ): Promise<Uint8Array<ArrayBufferLike>[]>

  Captures one or more still frames in a single headless browser session.

  Parameters

  • job: BackendStillsJob
  • Optionalsignal: AbortSignal

  Returns Promise<Uint8Array<ArrayBufferLike>[]>

ExtractKeyframes

• ExtractKeyframes(
      _videoPath: string,
      _outDir: string,
      max: number,
      signal?: AbortSignal,
  ): Promise<ExtractedKeyframe[]>

  Extracts representative keyframes (scene changes + uniform samples) from an MP4 file.

  Parameters

  • _videoPath: string
  • _outDir: string
  • max: number
  • Optionalsignal: AbortSignal

  Returns Promise<ExtractedKeyframe[]>

GetRendererVersion

• GetRendererVersion(): string

  Returns the installed renderer version string.

  Returns string

Health

• Health(): Promise<RenderHealth>

  Checks runtime dependencies and returns version and health status.

  Returns Promise<RenderHealth>

Lint

• Lint(
      _dir: string,
      _entry: string,
  ): Promise<{ Block: boolean; Issues: CheckIssue[] }>

  Runs static project and media URL lint checks on an unpacked bundle directory.

  Parameters

  • _dir: string
  • _entry: string

  Returns Promise<{ Block: boolean; Issues: CheckIssue[] }>

MeasureText

• MeasureText(
      job: BackendCheckJob,
      timestampsSeconds: readonly number[],
      signal?: AbortSignal,
  ): Promise<MeasuredText[][]>

  Seeks the composition to each timestamp in timestampsSeconds and measures visible text elements.

  Parameters

  • job: BackendCheckJob
  • timestampsSeconds: readonly number[]
  • Optionalsignal: AbortSignal

  Returns Promise<MeasuredText[][]>

Probe

• Probe(_videoPath: string): Promise<BackendProbeResult>

  Probes an MP4 file for duration, dimensions, and audio stream presence.

  Parameters

  • _videoPath: string

  Returns Promise<BackendProbeResult>

Render

• Render(
      job: BackendRenderJob,
      onProgress: (progress: RenderProgress) => void,
      signal?: AbortSignal,
  ): Promise<{ FrameCount: number; OutputPath: string }>

  Renders an unpacked composition to an MP4 file on disk, emitting progress events.

  Parameters

  • job: BackendRenderJob
  • onProgress: (progress: RenderProgress) => void
  • Optionalsignal: AbortSignal

  Returns Promise<{ FrameCount: number; OutputPath: string }>

RunCheckCli

• RunCheckCli(job: BackendCheckJob, signal?: AbortSignal): Promise<CheckIssue[]>

  Runs hyperframes check --json in a restricted subprocess and maps findings to CheckIssue[].

  Parameters

  • job: BackendCheckJob
  • Optionalsignal: AbortSignal

  Returns Promise<CheckIssue[]>