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app/state/numkit-cli/.zz/lanes/cli-clean-error-handling.json

zzmq.dev@gmail.com/zz / app / state / numkit-cli / .zz / lanes / cli-clean-error-handling.json @ a951ba59 Download
Ladder Summary
  • file This lane updates **numkit‑cli** so that the CLI cleanly handles the `RangeError` thrown by `average()` when given no numbers, converting the raw stack trace into a user‑friendly error message. It adds a `main(argv)` wrapper that catches any exception from `run(argv)` and returns a `{ok, output}` or `{ok, message}` object, and the entry‑point script prints the result or a prefixed “error:” line and exits with status 1. The module exports the two functions **run** (executes the command) and **main** (error‑capturing wrapper).
 {
  "id": "cli-clean-error-handling",
  "repo": "zz-demo/numkit-cli",
  "origin": {
  "repo": "zz-demo/numkit",
  "lane": "fix-average-empty"
  },
  "name": "handle average's empty-input error cleanly",
  "objective": "numkit's average() now throws RangeError for empty input instead of silently returning NaN. Running `numkit-cli average` with no numbers surfaced that as a raw stack trace. Catch it and print a clean CLI error instead.",
  "status": "claimed",
  "scope": [
  "cli.js",
  "cli.test.js"
  ],
  "trigger": {
  "kind": "manual",
  "proposed_by": "zz-dev"
  },
  "coordinators": [
  "zz-dev"
  ],
  "history": [
  {
  "id": "ask-cdf419f186",
  "type": "ASK",
  "kind": "claim_request",
  "from": "zz-dev",
  "at": "2026-10-10T03:36:04.664Z"
  },
  {
  "id": "answer-70826450b9",
  "type": "ANSWER",
  "ask": "ask-cdf419f186",
  "from": "zz-dev",
  "action": "grant",
  "at": "2026-10-10T03:36:04.665Z"
  },
  {
  "id": "ask-49d08d0fbe",
  "type": "ASK",
  "kind": "submit_changeset",
  "from": "zz-dev",
  "payload": {
  "files": [
  {
  "path": "cli.js",
  "content": "#!/usr/bin/env node\nimport { clamp, average } from \"numkit\";\n\nexport function run(argv) {\n const [command, ...args] = argv;\n if (command === \"clamp\") {\n const [value, min, max] = args.map(Number);\n return String(clamp(value, min, max));\n }\n if (command === \"average\") {\n return String(average(args.map(Number)));\n }\n throw new Error(`Unknown command: ${command}`);\n}\n\n// numkit's average() now throws RangeError on empty input (it used to\n// silently return NaN) -- without this, that surfaced as a raw,\n// unfriendly stack trace instead of a clean CLI error.\nexport function main(argv) {\n try {\n return { ok: true, output: run(argv) };\n } catch (err) {\n return { ok: false, message: err instanceof Error ? err.message : String(err) };\n }\n}\n\nif (import.meta.url === `file://${process.argv[1]}`) {\n const result = main(process.argv.slice(2));\n if (result.ok) {\n console.log(result.output);\n } else {\n console.error(`error: ${result.message}`);\n process.exit(1);\n }\n}\n"
  },
  {
  "path": "cli.test.js",
  "content": "import { test } from \"node:test\";\nimport assert from \"node:assert/strict\";\nimport { run, main } from \"./cli.js\";\n\ntest(\"clamp command clamps into range\", () => {\n assert.equal(run([\"clamp\", \"15\", \"0\", \"10\"]), \"10\");\n});\n\ntest(\"average command averages its arguments\", () => {\n assert.equal(run([\"average\", \"1\", \"2\", \"3\"]), \"2\");\n});\n\ntest(\"unknown command throws\", () => {\n assert.throws(() => run([\"nope\"]), /Unknown command/);\n});\n\n// Regression test for numkit's fix-average-empty: average([]) used to\n// return NaN silently; now it throws, and the CLI must surface that as\n// a clean error instead of an unhandled exception.\ntest(\"average with no numbers reports a clean error, not a crash\", () => {\n const result = main([\"average\"]);\n assert.equal(result.ok, false);\n assert.match(result.message, /must not be empty/);\n});\n"
  }
  ],
  "message": "Handle numkit's average() empty-input error cleanly"
  },
  "at": "2026-10-10T03:36:04.665Z"
  },
  {
  "id": "answer-95b19d6589",
  "type": "ANSWER",
  "ask": "ask-49d08d0fbe",
  "from": "zz-dev",
  "action": "grant",
  "payload": {
  "commit": "cb061f703b5d5dbd2a84652a52e416ff65003f1a"
  },
  "at": "2026-10-10T03:36:04.686Z"
  },
  {
  "id": "ask-728971ebd5",
  "type": "ASK",
  "kind": "merge_request",
  "from": "zz-dev",
  "payload": {
  "ladder": [
  {
  "path": "cli.js",
  "kind": "file"
  },
  {
  "path": "cli.test.js",
  "kind": "file"
  }
  ]
  },
  "at": "2026-10-10T03:36:04.686Z"
  },
  {
  "id": "answer-4145858612",
  "type": "ANSWER",
  "ask": "ask-728971ebd5",
  "from": "zz-dev",
  "action": "grant",
  "at": "2026-10-10T03:36:04.700Z"
  }
  ],
  "related_lanes": []
 }