{"slug":"mkosir-typescript-variables","name":"typescript-variables","description":"Apply, review, and explain TypeScript variable conventions. Use automatically for tasks involving variable declarations, const assertions, enum alternatives, literal-union state modelling, boolean flags, or choosing between null and undefined.","long_description":"---\nname: typescript-variables\ndescription: Apply, review, and explain TypeScript variable conventions. Use automatically for tasks involving variable declarations, const assertions, enum alternatives, literal-union state modelling, boolean flags, or choosing between null and undefined.\n---\n\n# Variables\n\nApply the TypeScript Style Guide's variable conventions in the context of the current task.\n\n## Workflow\n\n1. Inspect the consuming repository's conventions and configuration.\n2. Let explicit repository conventions take precedence over this opinionated guidance.\n3. Apply, review, or explain only the guidance relevant to the task.\n4. State important tradeoffs when the appropriate choice depends on context or judgment.\n\n## Boundaries\n\n- Keep TypeScript and ESLint responsible for checks they can enforce automatically.\n- Do not introduce unrelated TypeScript Style Guide conventions merely because this skill is active.\n\n## Related Guidance\n\n### Application State\n\nFor detailed guidance on states that require different data, use `typescript-discriminated-unions` when it is available.\n\n<!-- BEGIN CANONICAL GUIDE CONTENT -->\n\n## Variables\n\n### Const Assertion\n\nStrive to declare constants using the const assertion `as const`:\n\nConstants are used to represent values that are not meant to change, ensuring reliability and consistency in a codebase. Const assertions preserve literal types and infer readonly properties.\n\n- Type Narrowing - Using `as const` ensures that literal values (e.g., numbers, strings) are treated as exact values instead of generalized types like `number` or `string`.\n- Readonly Properties - Objects and arrays get readonly properties, so TypeScript catches direct mutations.\n\nExamples:\n\n- Objects\n\n  ```ts\n  // ❌ Avoid\n  const FOO_LOCATION = { x: 50, y: 130 }; // Type { x: number; y: number; }\n  FOO_LOCATION.x = 10;\n\n  // ✅ Use\n  const FOO_LOCATION = { x: 50, y: 130 } as const; // Type '{ readonly x: 50; readonly y: 130; }'\n  FOO_LOCATION.x = 10; // Error\n  ```\n\n- Arrays\n\n  ```ts\n  // ❌ Avoid\n  const BAR_LOCATION = [50, 130]; // Type number[]\n  BAR_LOCATION.push(10);\n\n  // ✅ Use\n  const BAR_LOCATION = [50, 130] as const; // Type 'readonly [50, 130]'\n  BAR_LOCATION.push(10); // Error\n  ```\n\n- Template Literals\n\n  ```ts\n  // ❌ Avoid\n  const RATE_LIMIT = 25;\n  const RATE_LIMIT_MESSAGE = `Max number of requests/min is ${RATE_LIMIT}.`; // Type string\n\n  // ✅ Use\n  const RATE_LIMIT = 25;\n  const RATE_LIMIT_MESSAGE = `Max number of requests/min is ${RATE_LIMIT}.` as const; // Type 'Max number of requests/min is 25.'\n  ```\n\n### Enums & Const Assertion\n\nEnums are discouraged in the TypeScript ecosystem due to their runtime cost and quirks.  \nThe TypeScript documentation outlines several [pitfalls](https://www.typescriptlang.org/docs/handbook/enums.html#const-enum-pitfalls), and TypeScript 5.8 introduced the [--erasableSyntaxOnly](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-8.html#the---erasablesyntaxonly-option) flag to disable runtime-generating features like enums altogether.\n\n<Rule href=\"https://eslint.org/docs/latest/rules/no-restricted-syntax\">{`'no-restricted-syntax': [\n    'error',\n    {\n      selector: 'TSEnumDeclaration',\n      message: 'Replace enum with a literal type or a const assertion.',\n    },\n]`}</Rule>\n\nAs a rule of thumb, prefer:\n\n- Literal types whenever possible.\n- Const assertion arrays when looping through values.\n- Const assertion objects when enumerating arbitrary values.\n\nExamples:\n\n- Use literal types to avoid runtime objects and reduce bundle size.\n\n  ```ts\n  // ❌ Avoid using enums as they increase the bundle size\n  enum UserRole {\n    GUEST = 'guest',\n    MODERATOR = 'moderator',\n    ADMINISTRATOR = 'administrator',\n  }\n\n  // Transpiled JavaScript\n  ('use strict');\n  var UserRole;\n  (function (UserRole) {\n    UserRole['GUEST'] = 'guest';\n    UserRole['MODERATOR'] = 'moderator';\n    UserRole['ADMINISTRATOR'] = 'administrator';\n  })(UserRole || (UserRole = {}));\n\n  // ✅ Use literal types - Types are stripped during transpilation\n  type UserRole = 'guest' | 'moderator' | 'administrator';\n\n  const isGuest = (role: UserRole) => role === 'guest';\n  ```\n\n- Use const assertion arrays when looping through values.\n\n  ```tsx\n  // ❌ Avoid using enums\n  enum USER_ROLES {\n    guest = 'guest',\n    moderator = 'moderator',\n    administrator = 'administrator',\n  }\n\n  // ✅ Use const assertions arrays\n  const USER_ROLES = ['guest', 'moderator', 'administrator'] as const;\n  type UserRole = (typeof USER_ROLES)[number];\n\n  const seedDatabase = () => {\n    USER_ROLES.forEach((role) => {\n      db.roles.insert(role);\n    }\n  }\n  const insert = (role: UserRole) => {...\n\n  const UsersRoleList = () => {\n    return (\n      <div>\n        {USER_ROLES.map((role) => (\n          <Item key={role} role={role} />\n        ))}\n      </div>\n    );\n  };\n  const Item = ({ role }: { role: UserRole }) => {...\n  ```\n\n- Use const assertion objects when enumerating arbitrary values.\n\n  ```ts\n  // ❌ Avoid using enums\n  enum COLORS {\n    primary = '#B33930',\n    secondary = '#113A5C',\n    brand = '#9C0E7D',\n  }\n\n  // ✅ Use const assertions objects\n  const COLORS = {\n    primary: '#B33930',\n    secondary: '#113A5C',\n    brand: '#9C0E7D',\n  } as const;\n\n  type Colors = typeof COLORS;\n  type ColorKey = keyof Colors; // Type \"primary\" | \"secondary\" | \"brand\"\n  type ColorValue = Colors[ColorKey]; // Type \"#B33930\" | \"#113A5C\" | \"#9C0E7D\"\n\n  const setColor = (color: ColorValue) => {...\n\n  setColor(COLORS.primary);\n  setColor('#B33930');\n  ```\n\n### Type Union & Boolean Flags\n\nEmbrace type unions, especially when type union options are mutually exclusive, instead multiple boolean flag variables.\n\nBoolean flags have a tendency to accumulate over time, leading to confusing and error-prone code, since they hide the actual app state.\n\n```ts\n// ❌ Avoid introducing multiple boolean flag variables\nconst isPending, isProcessing, isConfirmed, isExpired;\n\n// ✅ Use type union variable\ntype UserStatus = 'pending' | 'processing' | 'confirmed' | 'expired';\nconst userStatus: UserStatus;\n```\n\nUse a literal union when only the state value changes. When each state requires different data, use a [discriminated union](#application-state) to represent the valid states explicitly.\n\n### Null & Undefined\n\nWith `strictNullChecks`, `null` and `undefined` have distinct types and meanings. Use them consistently based on what absence means in the application.  \nStrive to:\n\n- Use `null` when a value is explicitly empty, such as an assignment or function return value.\n- Use `undefined` when a value is missing or omitted, such as an optional field in a form, request payload, or database query ([Prisma differentiation](https://www.prisma.io/docs/concepts/components/prisma-client/null-and-undefined)).\n\n<!-- END CANONICAL GUIDE CONTENT -->\n","tagline":"Apply, review, and explain TypeScript variable conventions. 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Reviewed with permission notes; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"mkosir-typescript-variables","task":"Use typescript-variables in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/mkosir-typescript-variables","api":"https://www.openagentskill.com/api/agent/skills/mkosir-typescript-variables","audit":"https://www.openagentskill.com/skills/mkosir-typescript-variables/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=mkosir-typescript-variables&task=Use%20typescript-variables%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20typescript-variables%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20typescript-variables%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/mkosir-typescript-variables/install","manifest":"https://www.openagentskill.com/api/registry/manifest/mkosir-typescript-variables"}},"supply_profile":{"track":{"slug":"coding","label":"Coding and developer agents","shortLabel":"Coding","description":"Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills."},"scenario":{"label":"GitHub automation","description":"I need my agent to triage GitHub issues, review pull requests, and summarize repository changes.","useCases":[{"slug":"browser-automation","title":"Browser automation"},{"slug":"github-automation","title":"GitHub automation"},{"slug":"coding-agents","title":"Coding agents"}]},"applicableAgents":["Claude Code","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add mkosir/typescript-style-guide --skill typescript-variables","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":784,"starsLabel":"784","forks":37,"license":"MIT","qualityScore":76,"trustScore":82,"auditScore":85},"maintenance":{"status":"fresh","label":"11d since push","daysSincePush":11,"lastPushedAt":"2026-08-27T11:53:42+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Needs review"]},"coverageTags":["Coding","GitHub automation","automation","agent-skill"]},"audit":{"audit_score":85,"risk_level":"needs_review","risk_label":"Needs review","quality_score":76,"trust_score":82,"maintenance_score":100,"security_score":86,"install_score":92,"warnings":["Financial research output is not financial advice; require human review before any live investment decision","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"]},"quality_signals":{"model":"v2","star_score":20.26,"usage_score":0,"review_score":5.1,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"use_cases":[{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"},{"slug":"workflow-automation","title":"Workflow automation","url":"https://www.openagentskill.com/use-cases/workflow-automation"}],"stacks":[{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"},{"slug":"content-growth-agent","title":"Content growth agent","url":"https://www.openagentskill.com/collections/content-growth-agent"},{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"}],"install":"npx skills add mkosir/typescript-style-guide --skill typescript-variables","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add mkosir-typescript-variables","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"typescript-variables\" agent skill from https://github.com/mkosir/typescript-style-guide/tree/main/skills/typescript-variables. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Apply, review, and explain TypeScript variable conventions. Use automatically for tasks involving variable declarations, const assertions, enum alternatives, literal-union state modelling, boolean flags, or choosing between null and undefined. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mkosir-typescript-variables\",\"task\":\"Install typescript-variables\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"typescript-variables\" as a Claude Code skill from https://github.com/mkosir/typescript-style-guide/tree/main/skills/typescript-variables. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Apply, review, and explain TypeScript variable conventions. Use automatically for tasks involving variable declarations, const assertions, enum alternatives, literal-union state modelling, boolean flags, or choosing between null and undefined. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mkosir-typescript-variables\",\"task\":\"Install typescript-variables\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"typescript-variables\" from https://github.com/mkosir/typescript-style-guide/tree/main/skills/typescript-variables into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Apply, review, and explain TypeScript variable conventions. Use automatically for tasks involving variable declarations, const assertions, enum alternatives, literal-union state modelling, boolean flags, or choosing between null and undefined. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mkosir-typescript-variables\",\"task\":\"Install typescript-variables\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/mkosir/typescript-style-guide/tree/main/skills/typescript-variables","github_repo":"mkosir/typescript-style-guide","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/mkosir-typescript-variables","repository":"https://github.com/mkosir/typescript-style-guide/tree/main/skills/typescript-variables","api":"/api/agent/skills/mkosir-typescript-variables","install_api":"/api/skills/mkosir-typescript-variables/install"},"meta":{"created_at":"2026-09-02T18:26:47.04055+00:00","updated_at":"2026-09-02T18:26:47.103405+00:00","agent_friendly":true}}