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ts-05-state-machine

0.571
4/7 tests· typing

Proposed solution

```typescript
export interface Machine<S extends string, E extends string> {
  state: S;
  send(event: E): void;
  can(event: E): boolean;
}

export function createMachine<S extends string, E extends string>(config: {
  initial: S;
  states: Record<S, Partial<Record<E, S>>>;
}): Machine<S, E> {
  let currentState: S = config.initial;

  const machine: Machine<S, E> = {
    state: currentState,
    send(event: E): void {
      const nextState = config.states[currentState]?.[event];
      if (nextState) {
        currentState = nextState;
      }
    },
    can(event: E): boolean {
      return config.states[currentState]?.[event] !== undefined;
    },
  };

  return machine;
}
```

Test output (stdout)

TAP version 13
# Subtest: starts in the initial state
ok 1 - starts in the initial state
  ---
  duration_ms: 0.369754
  type: 'test'
  ...
# Subtest: valid transition changes state
not ok 2 - valid transition changes state
  ---
  duration_ms: 0.878899
  type: 'test'
  location: '/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:1:483'
  failureType: 'testCodeFailure'
  error: |-
    Expected values to be strictly equal:
    
    'idle' !== 'running'
    
  code: 'ERR_ASSERTION'
  name: 'AssertionError'
  expected: 'running'
  actual: 'idle'
  operator: 'strictEqual'
  stack: |-
    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:26:10)
    Test.runInAsyncScope (node:async_hooks:227:14)
    Test.run (node:internal/test_runner/test:1306:25)
    Test.processPendingSubtests (node:internal/test_runner/test:897:18)
    Test.postRun (node:internal/test_runner/test:1447:19)
    Test.run (node:internal/test_runner/test:1372:12)
    async startSubtestAfterBootstrap (node:internal/test_runner/harness:385:3)
  ...
# Subtest: invalid transition is ignored
ok 3 - invalid transition is ignored
  ---
  duration_ms: 0.05862
  type: 'test'
  ...
# Subtest: can reflects available transitions
ok 4 - can reflects available transitions
  ---
  duration_ms: 0.07474
  type: 'test'
  ...
# Subtest: can updates after a transition
ok 5 - can updates after a transition
  ---
  duration_ms: 0.04595
  type: 'test'
  ...
# Subtest: multi-step sequence
not ok 6 - multi-step sequence
  ---
  duration_ms: 0.138972
  type: 'test'
  location: '/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:1:1040'
  failureType: 'testCodeFailure'
  error: |-
    Expected values to be strictly equal:
    
    'idle' !== 'paused'
    
  code: 'ERR_ASSERTION'
  name: 'AssertionError'
  expected: 'paused'
  actual: 'idle'
  operator: 'strictEqual'
  stack: |-
    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:54:10)
    Test.runInAsyncScope (node:async_hooks:227:14)
    Test.run (node:internal/test_runner/test:1306:25)
    Test.processPendingSubtests (node:internal/test_runner/test:897:18)
    Test.postRun (node:internal/test_runner/test:1447:19)
    Test.run (node:internal/test_runner/test:1372:12)
    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)
  ...
# Subtest: self / terminal states with no outgoing events ignore everything
not ok 7 - self / terminal states with no outgoing events ignore everything
  ---
  duration_ms: 0.094711
  type: 'test'
  location: '/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:1:1212'
  failureType: 'testCodeFailure'
  error: |-
    Expected values to be strictly equal:
    
    'on' !== 'done'
    
  code: 'ERR_ASSERTION'
  name: 'AssertionError'
  expected: 'done'
  actual: 'on'
  operator: 'strictEqual'
  stack: |-
    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:69:10)
    Test.runInAsyncScope (node:async_hooks:227:14)
    Test.run (node:internal/test_runner/test:1306:25)
    Test.processPendingSubtests (node:internal/test_runner/test:897:18)
    Test.postRun (node:internal/test_runner/test:1447:19)
    Test.run (node:internal/test_runner/test:1372:12)
    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)
  ...
1..7
# tests 7
# suites 0
# pass 4
# fail 3
# cancelled 0
# skipped 0
# todo 0
# duration_ms 78.534674
Self-repair attempts
[
  {
    "total": 7,
    "answer": "```typescript\nexport interface Machine<S extends string, E extends string> {\n  state: S;\n  send(event: E): void;\n  can(event: E): boolean;\n}\n\nexport function createMachine<S extends string, E extends string>(config: {\n  initial: S;\n  states: Record<S, Partial<Record<E, S>>>;\n}): Machine<S, E> {\n  let currentState: S = config.initial;\n\n  const machine: Machine<S, E> = {\n    state: currentState,\n    send(event: E): void {\n      const nextState = config.states[currentState]?.[event];\n      if (nextState) {\n        currentState = nextState;\n      }\n    },\n    can(event: E): boolean {\n      return config.states[currentState]?.[event] !== undefined;\n    },\n  };\n\n  return machine;\n}\n```",
    "passed": 4,
    "test_error": "ode:internal/test_runner/test:1372:12)\n    async startSubtestAfterBootstrap (node:internal/test_runner/harness:385:3)\n  ...\n# Subtest: invalid transition is ignored\nok 3 - invalid transition is ignored\n  ---\n  duration_ms: 0.05862\n  type: 'test'\n  ...\n# Subtest: can reflects available transitions\nok 4 - can reflects available transitions\n  ---\n  duration_ms: 0.07474\n  type: 'test'\n  ...\n# Subtest: can updates after a transition\nok 5 - can updates after a transition\n  ---\n  duration_ms: 0.04595\n  type: 'test'\n  ...\n# Subtest: multi-step sequence\nnot ok 6 - multi-step sequence\n  ---\n  duration_ms: 0.138972\n  type: 'test'\n  location: '/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:1:1040'\n  failureType: 'testCodeFailure'\n  error: |-\n    Expected values to be strictly equal:\n    \n    'idle' !== 'paused'\n    \n  code: 'ERR_ASSERTION'\n  name: 'AssertionError'\n  expected: 'paused'\n  actual: 'idle'\n  operator: 'strictEqual'\n  stack: |-\n    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:54:10)\n    Test.runInAsyncScope (node:async_hooks:227:14)\n    Test.run (node:internal/test_runner/test:1306:25)\n    Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n    Test.postRun (node:internal/test_runner/test:1447:19)\n    Test.run (node:internal/test_runner/test:1372:12)\n    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n  ...\n# Subtest: self / terminal states with no outgoing events ignore everything\nnot ok 7 - self / terminal states with no outgoing events ignore everything\n  ---\n  duration_ms: 0.094711\n  type: 'test'\n  location: '/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:1:1212'\n  failureType: 'testCodeFailure'\n  error: |-\n    Expected values to be strictly equal:\n    \n    'on' !== 'done'\n    \n  code: 'ERR_ASSERTION'\n  name: 'AssertionError'\n  expected: 'done'\n  actual: 'on'\n  operator: 'strictEqual'\n  stack: |-\n    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-u2db8lxk/solution.test.ts:69:10)\n    Test.runInAsyncScope (node:async_hooks:227:14)\n    Test.run (node:internal/test_runner/test:1306:25)\n    Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n    Test.postRun (node:internal/test_runner/test:1447:19)\n    Test.run (node:internal/test_runner/test:1372:12)\n    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n  ...\n1..7\n# tests 7\n# suites 0\n# pass 4\n# fail 3\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 78.534674"
  },
  {
    "total": 7,
    "answer": "```typescript\nexport interface Machine<S extends string, E extends string> {\n  state: S;\n  send(event: E): void;\n  can(event: E): boolean;\n}\n\nexport function createMachine<S extends string, E extends string>(config: {\n  initial: S;\n  states: Record<S, Partial<Record<E, S>>>;\n}): Machine<S, E> {\n  let currentState: S = config.initial;\n\n  const machine: Machine<S, E> = {\n    state: currentState,\n    send(event: E): void {\n      const nextState = config.states[currentState]?.[event];\n      if (nextState) {\n        currentState = nextState;\n      }\n    },\n    can(event: E): boolean {\n      return config.states[currentState]?.[event] !== undefined;\n    },\n  };\n\n  return machine;\n}\n```",
    "passed": 4,
    "test_error": "e:internal/test_runner/test:1372:12)\n    async startSubtestAfterBootstrap (node:internal/test_runner/harness:385:3)\n  ...\n# Subtest: invalid transition is ignored\nok 3 - invalid transition is ignored\n  ---\n  duration_ms: 0.058061\n  type: 'test'\n  ...\n# Subtest: can reflects available transitions\nok 4 - can reflects available transitions\n  ---\n  duration_ms: 0.047691\n  type: 'test'\n  ...\n# Subtest: can updates after a transition\nok 5 - can updates after a transition\n  ---\n  duration_ms: 0.04605\n  type: 'test'\n  ...\n# Subtest: multi-step sequence\nnot ok 6 - multi-step sequence\n  ---\n  duration_ms: 0.129581\n  type: 'test'\n  location: '/tmp/llmlab-ts-05-state-machine-otxj8yq8/solution.test.ts:1:1040'\n  failureType: 'testCodeFailure'\n  error: |-\n    Expected values to be strictly equal:\n    \n    'idle' !== 'paused'\n    \n  code: 'ERR_ASSERTION'\n  name: 'AssertionError'\n  expected: 'paused'\n  actual: 'idle'\n  operator: 'strictEqual'\n  stack: |-\n    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-otxj8yq8/solution.test.ts:54:10)\n    Test.runInAsyncScope (node:async_hooks:227:14)\n    Test.run (node:internal/test_runner/test:1306:25)\n    Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n    Test.postRun (node:internal/test_runner/test:1447:19)\n    Test.run (node:internal/test_runner/test:1372:12)\n    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n  ...\n# Subtest: self / terminal states with no outgoing events ignore everything\nnot ok 7 - self / terminal states with no outgoing events ignore everything\n  ---\n  duration_ms: 0.140081\n  type: 'test'\n  location: '/tmp/llmlab-ts-05-state-machine-otxj8yq8/solution.test.ts:1:1212'\n  failureType: 'testCodeFailure'\n  error: |-\n    Expected values to be strictly equal:\n    \n    'on' !== 'done'\n    \n  code: 'ERR_ASSERTION'\n  name: 'AssertionError'\n  expected: 'done'\n  actual: 'on'\n  operator: 'strictEqual'\n  stack: |-\n    TestContext.<anonymous> (/tmp/llmlab-ts-05-state-machine-otxj8yq8/solution.test.ts:69:10)\n    Test.runInAsyncScope (node:async_hooks:227:14)\n    Test.run (node:internal/test_runner/test:1306:25)\n    Test.processPendingSubtests (node:internal/test_runner/test:897:18)\n    Test.postRun (node:internal/test_runner/test:1447:19)\n    Test.run (node:internal/test_runner/test:1372:12)\n    async Test.processPendingSubtests (node:internal/test_runner/test:897:7)\n  ...\n1..7\n# tests 7\n# suites 0\n# pass 4\n# fail 3\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 77.938257"
  },
  {
    "total": 7,
    "answer": "```typescript\nexport interface Machine<S extends string, E extends string> {\n  state: S;\n  send(event: E): void;\n  can(event: E): boolean;\n}\n\nexport function createMachine<S extends string, E extends string>(config: {\n  initial: S;\n  states: Record<S, Partial<Record<E, S>>>;\n}): Machine<S, E> {\n  let currentState: S = config.initial;\n\n  const machine: Machine<S, E> = {\n    state: currentState,\n    send(event: E): void {\n      const nextState = config.states[currentState]?.[event];\n      if (nextState) {\n        currentState = nextState;\n      }\n    },\n    can(event: E): boolean {\n      return config.states[currentState]?.[event] !== undefined;\n    },\n  };\n\n  return machine;\n}\n```",
    "passed": 4,
    "test_error": ""
  }
]
System prompt
You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.