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type { z } from \"npm:zod@^3.23\";\nimport { ExecutionEngine } from \"./engine.ts\";\nimport { WorkflowRun } from \"./run.ts\";\nimport { WorkflowStorage } from \"./storage.ts\";\nimport type { Step, StepFlowEntry, WorkflowConfig } from \"./types.ts\";\nimport {\n\ttype VisualizationFormat,\n\ttype VisualizationOptions,\n\tvisualizeWorkflow,\n} from \"./visualize.ts\";\n\n/**\n * Workflow builder with fluent API and type inference\n */\nexport class WorkflowBuilder<\n\tTSteps extends Record>,\n\tTWorkflowId extends string,\n\tTInput,\n\tTPrevOutput,\n\tTState = unknown,\n> {\n\tconstructor(\n\t\tprivate config: WorkflowConfig,\n\t\tprivate steps: TSteps,\n\t\tprivate stepFlow: StepFlowEntry[],\n\t) {}\n\n\t/**\n\t * Add a sequential step to the workflow\n\t * The step's input must match the previous step's output\n\t */\n\tthen>(\n\t\tstep: TStep,\n\t): WorkflowBuilder<\n\t\tTSteps & Record,\n\t\tTWorkflowId,\n\t\tTInput,\n\t\tz.infer,\n\t\tTState\n\t> {\n\t\tconst newSteps = { ...this.steps, [step.id]: step } as TSteps &\n\t\t\tRecord;\n\t\tconst newStepFlow = [...this.stepFlow, { type: \"step\" as const, step }];\n\n\t\treturn new WorkflowBuilder(this.config, newSteps, newStepFlow);\n\t}\n\n\t/**\n\t * Finalize the workflow and make it executable\n\t */\n\tcommit(): Workflow {\n\t\treturn new Workflow(this.config, this.steps, this.stepFlow);\n\t}\n}\n\n/**\n * Executable workflow instance\n */\nexport class Workflow<\n\tTSteps extends Record>,\n\tTWorkflowId extends string,\n\tTInput,\n\tTOutput,\n\tTState = unknown,\n> {\n\tprivate engine: ExecutionEngine;\n\tprivate storage: WorkflowStorage;\n\n\tconstructor(\n\t\tpublic readonly config: WorkflowConfig<\n\t\t\tTWorkflowId,\n\t\t\tTInput,\n\t\t\tTOutput,\n\t\t\tTState\n\t\t>,\n\t\tpublic readonly steps: TSteps,\n\t\tpublic readonly stepFlow: StepFlowEntry[],\n\t) {\n\t\tthis.storage = new WorkflowStorage();\n\t\tthis.engine = new ExecutionEngine(this.storage);\n\t}\n\n\t/**\n\t * Initialize the workflow (creates database tables)\n\t */\n\tasync init(): Promise {\n\t\tawait this.storage.init();\n\t}\n\n\t/**\n\t * Create a new workflow run instance\n\t */\n\tasync createRun(\n\t\trunId?: string,\n\t): Promise> {\n\t\t// Initialize storage if not already done\n\t\tawait this.init();\n\n\t\tconst id = runId || crypto.randomUUID();\n\t\treturn new WorkflowRun(this, id, this.engine, this.storage);\n\t}\n\n\t/**\n\t * Get the workflow ID\n\t */\n\tget id(): TWorkflowId {\n\t\treturn this.config.id as TWorkflowId;\n\t}\n\n\t/**\n\t * Get the input schema\n\t */\n\tget inputSchema(): z.ZodSchema {\n\t\treturn this.config.inputSchema;\n\t}\n\n\t/**\n\t * Get the output schema\n\t */\n\tget outputSchema(): z.ZodSchema {\n\t\treturn this.config.outputSchema as z.ZodSchema;\n\t}\n\n\t/**\n\t * Get the state schema\n\t */\n\tget stateSchema(): z.ZodSchema | undefined {\n\t\treturn this.config.stateSchema;\n\t}\n\n\t/**\n\t * Generate a visual representation of this workflow\n\t *\n\t * @param format - The visualization format (default: \"mermaid\")\n\t * @param options - Visualization options\n\t * @returns Visualization string in the specified format\n\t *\n\t * @example\n\t * ```typescript\n\t * const diagram = workflow.visualize(\"mermaid\");\n\t * console.log(diagram);\n\t * ```\n\t */\n\tvisualize(\n\t\tformat: VisualizationFormat = \"mermaid\",\n\t\toptions: VisualizationOptions = {},\n\t): string {\n\t\treturn visualizeWorkflow(this, format, options);\n\t}\n}\n\n/**\n * Create a new workflow with strong typing\n *\n * @example\n * ```typescript\n * const workflow = createWorkflow({\n * id: 'email-campaign',\n * inputSchema: z.object({ userId: z.string() }),\n * outputSchema: z.object({ sent: z.boolean() })\n * })\n * .then(fetchUser)\n * .then(generateEmail)\n * .then(sendEmail)\n * .commit();\n * ```\n */\nexport function createWorkflow<\n\tTId extends string,\n\tTInput,\n\tTOutput,\n\tTState = unknown,\n>(\n\tconfig: WorkflowConfig,\n): WorkflowBuilder<{}, TId, TInput, TInput, TState> {\n\treturn new WorkflowBuilder(config, {}, []);\n}\n","deleted","label",[172,156],"backend","permalink","https://www.val.town/x/dk3/wrkflw/code/backend/workflow.ts","extension","actionData","errors"]