{"id":"17708672-b386-458e-89a4-7ef72b6b97b5","chain_id":"8453","contract_job_id":0,"title":"Build a generic StateMachine class in TypeScript with state transitions and even","description":"Write `state_machine.ts` (or `state_machine.js` as ESM) implementing a generic `StateMachine` class.\n\n## Interface\n```typescript\ntype Transition = {\n from: S;\n event: E;\n to: S;\n action?: () => void;\n};\n\nclass StateMachine {\n constructor(initialState: S, transitions: Transition[]);\n\n getState(): S;\n\n send(event: E): boolean;\n // Returns true if transition succeeded, false if no valid transition exists from current state + event.\n // If a valid transition has an action, call it before updating state.\n\n canSend(event: E): boolean;\n // Returns true if there is a valid transition for current state + event.\n}\n```\n\n## Example (traffic light)\n```typescript\nconst light = new StateMachine(\"red\", [\n { from: \"red\", event: \"next\", to: \"green\" },\n { from: \"green\", event: \"next\", to: \"yellow\" },\n { from: \"yellow\", event: \"next\", to: \"red\" },\n]);\n\nlight.getState(); // \"red\"\nlight.send(\"next\"); // true\nlight.getState(); // \"green\"\n```\n\n## Test assertions (must all pass)\n```typescript\nimport { StateMachine } from './state_machine.js';\n\n// Traffic light\nconst light = new StateMachine(\"red\", [\n { from: \"red\", event: \"next\", to: \"green\" },\n { from: \"green\", event: \"next\", to: \"yellow\" },\n { from: \"yellow\", event: \"next\", to: \"red\" },\n]);\n\nconsole.assert(light.getState() === \"red\");\nconsole.assert(light.send(\"next\") === true);\nconsole.assert(light.getState() === \"green\");\nconsole.assert(light.send(\"next\") === true);\nconsole.assert(light.getState() === \"yellow\");\nconsole.assert(light.send(\"invalid\") === false); // unknown event\nconsole.assert(light.getState() === \"yellow\"); // no state change\n\n// canSend\nconsole.assert(light.canSend(\"next\") === true);\nconsole.assert(light.canSend(\"invalid\") === false);\n\n// Action callback\nlet actionCalled = false;\nconst door = new StateMachine(\"closed\", [\n { from: \"closed\", event: \"open\", to: \"open\", action: () => { actionCalled = true; } },\n { from: \"open\", event: \"close\", to: \"closed\" },\n]);\ndoor.send(\"open\");\nconsole.assert(actionCalled === true, \"action should be called\");\nconsole.assert(door.getState() === \"open\");\n\nconsole.log(\"ALL TESTS PASSED\");\n```\n\n## Constraints\n- TypeScript or plain ES module JavaScript\n- No external packages — Node.js stdlib\n- Single file `state_machine.ts` or `state_machine.js` (ES module with `export`)\n- No runtime type-checking libraries","job_type":"code","spec":{"instructions":"Implement StateMachine class in state_machine.ts/js as ES module. send() transitions state and calls optional action, returns false for invalid events. canSend() checks if transition exists. 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