ENGLISH·COURSE API
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    Variable

    markLessonCompleteActionConst

    markLessonCompleteAction: SafeActionFn<
        string,
        ZodObject<{ lessonId: $ZodBranded<ZodUUID, "LessonId", "out"> }, $strip>,
        readonly [],
        {} & { lessonId?: {} },
        { completed: boolean },
    > = ...

    Records a lesson as complete for the signed-in learner.

    { completed: false } when the lesson does not exist