How do I install the Varletjs Rattail Rattail skill?

Run npx skillmds@latest add tomevault-io/varletjs-rattail-rattail in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Varletjs Rattail Rattail skill do?

Rattail It is listed under Coding & Dev Tools on SkillMD.

Is Varletjs Rattail Rattail safe to use?

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Which AI agents work with Varletjs Rattail Rattail?

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Is Varletjs Rattail Rattail free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Varletjs Rattail Rattail?

tomevault-io (@tomevault-io) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Varletjs Rattail Rattail by tomevault-io

Name: Varletjs Rattail Rattail
Author: tomevault-io

Rattail

A Vite+ oriented, AI Agent friendly front-end toolchain from rattail. All utilities, integrations, and CLI are published under one rattail package.

IMPORTANT: For each API, open the corresponding references/<name>.md (see tables below). Those files mirror the VitePress docs (usage, arguments, return), link to the official English and Chinese pages on rattail.varletjs.org, and include the corresponding src/**/*.ts excerpt as type declarations.

CLI (`rt`)

Binary name: rt (registered via package.json → dist/cli/bin.mjs). Built with Commander. Unifies release, changelog, commit-lint, API generation, hook management, cleanup, and lockfile checking into a single CLI.

Configuration: All CLI commands read from the rattail key inside vite.config.ts (loaded via unconfig). See references/cli/configuration.md.

Commands

Command	Description	Reference
`rt clean [patterns...]`	Remove files and directories using glob patterns	references/cli/clean.md
`rt api`	Generate API modules from OpenAPI/Swagger schema	references/cli/api.md
`rt hook`	Install git hooks from config	references/cli/hook.md
`rt release`	Release packages, generate changelogs, tag, optionally publish	references/cli/release.md
`rt changelog`	Generate changelog	references/cli/changelog.md
`rt commit-lint <path>`	Lint a commit message file	references/cli/commit-lint.md
`rt lockfile-check`	Check lockfile updates and auto-install dependencies	references/cli/lockfile-check.md

Quick start

// vite.config.ts
import { defineConfig } from 'rattail/vite-plus'

export default defineConfig({
  rattail: {
    clean: ['dist', 'coverage'],

    hook: {
      'commit-msg': ['rt commit-lint $1'],
    },

    api: {
      input: './schema.yaml',
      output: './src/apis/generated',
      preset: 'axle',
    },

    release: {
      // @varlet/release options
    },

    changelog: {
      // @varlet/release changelog options
    },
  },
})

Programmatic usage

All CLI commands are also available as functions:

import { clean, api, hook, release, changelog, commitLint, lockfileCheck } from 'rattail/cli'

Core functions

Import from rattail:

import { isString, debounce, cloneDeep /* ... */ } from 'rattail'

General

Function	Description
`isString`	Determine whether the input value is a `string`.
`isNumber`	Determine whether the input value is a `number`.
`isNumeric`	Determine whether the input value is a `number` or a `numeric string`.
`isBoolean`	Determine whether the input value is a `boolean`.
`isTruthy`	Determine whether the input value is `truthy`.
`isPrimitive`	Determine whether the input value is a `primitive`.
`isPlainObject`	Determine whether the input value is a `plain object`.
`isObject`	Determine whether the input value is an `object` (excluding `null`).
`isArray`	Determine whether the input value is an `array`.
`isNullish`	Determine whether the input value is `null` or `undefined`.
`isPromise`	Determine whether the input value is a `Promise`.
`isRegExp`	Determine whether the input value is a `RegExp`.
`isFunction`	Determine whether the input value is a `function`.
`isDate`	Determine whether the input value is a `Date`.
`isSet`	Determine whether the input value is a `Set`.
`isMap`	Determine whether the input value is a `Map`.
`isSymbol`	Determine whether the input value is a `symbol`.
`isWeakMap`	Determine whether the input value is a `WeakMap`.
`isWeakSet`	Determine whether the input value is a `WeakSet`.
`isBlob`	Determine whether the input value is a `Blob`.
`isFile`	Determine whether the input value is a `File`.
`isArrayBuffer`	Determine whether the input value is a `ArrayBuffer`.
`isTypedArray`	Determine whether the input value is a `TypedArray`.
`isDataView`	Determine whether the input value is a `DataView`.
`isError`	Determine whether the input value is an `Error` object.
`isDOMException`	Determine whether the input value is a `DOMException` object.
`isWindow`	Determine whether the input value is the global `window` object.
`isEmpty`	Determine whether the input value is empty (`undefined`, `null`, an `empty string`, or an `empty array`).
`isEmptyPlainObject`	Determine whether the input value is a empty (no own enumerable keys and no symbols) plain object.
`isNonEmptyArray`	Determine whether the input value is a `non-empty array`.
`isEqual`	Deeply compare two values.
`isEqualWith`	Deeply compare two values. Supports passing a comparison method, and returns `true` if the two values are equal.
`inBrowser`	Determine whether the code is running in a `browser` environment.
`inMobile`	Determine whether the code is running in a `mobile` browser environment.
`hasOwn`	Determine whether an `object` has a specific property as its own (not inherited).
`hasDuplicates`	Checks if an array contains duplicate values.
`hasDuplicatesBy`	Checks if an array contains duplicate values based on a custom comparison function.
`supportTouch`	Determine whether the current environment supports `touch events`.
`toTypeString`	Return the `type string` of the input value.
`toRawType`	Return the `raw type` of the input value.
`getGlobalThis`	Retrieve the global object based on the current environment.
`assert`	Throws an error when the input value is not `true`, the second argument is the error message.

Number

Function	Description
`toNumber`	Convert the input value to a `number`. If the value is `null` or `undefined`, it returns `0`.
`genNumberKey`	Generate a unique numeric key, `incrementing` with each call.
`randomNumber`	Generate a random integer between `min` and `max`, inclusive.
`clamp`	Clamp a number within the inclusive `min` and `max` bounds.
`clampArrayRange`	Clamp an index within the bounds of an array's length.
`times`	Execute a function a specified number of times and return an array of results.
`delay`	Create a promise that resolves after a specified time in milliseconds.

String

Function	Description
`randomString`	Generate a random alphanumeric string of a specified length.
`randomColor`	Generate a random hexadecimal color string.
`genStringKey`	Generate a unique `string` key by incrementing a numeric value and converting it to a string.
`camelize`	Convert a string to `camelCase`.
`kebabCase`	Convert a string to `kebab-case`.
`pascalCase`	Convert a string to `PascalCase`.
`upperFirst`	Capitalize the `first letter` of a `string`, leaving the rest unchanged.
`lowerFirst`	Lowercase the `first letter` of the `string` and keep the rest unchanged.
`slash`	Convert all backslashes (`\`) in a path to forward slashes (`/`).
`ensurePrefix`	Ensure that a prefix exists in the `string`, and add it if it does not exist.
`ensureSuffix`	Ensure that a suffix exists in the `string`, and add it if it does not exist.
`maskString`	Mask part of a string with a specified character, keeping prefix and suffix visible.

Math

Function	Description
`sum`	Calculates the sum of values in an `array` of numbers.
`sumBy`	Calculates the sum of values in an `array` based on a provided function.
`sumHash`	Calculate a hash sum for a given value.
`minBy`	Find the `minimum` value in an `array` based on a function applied to each element.
`maxBy`	Find the maximum value in an array based on a function applied to each element.
`mean`	Calculate the `mean` (average) of an `array` of `numbers`.
`meanBy`	Calculate the mean (average) of an `array` by applying a function to each element.
`sample`	Return a random element from an `array`.
`round`	Return number rounded to precision.
`floor`	Return number rounded down to precision.
`ceil`	Return number rounded up to precision.

Object

Function	Description
`set`	Set a value at a given path in an object, creating nested objects or arrays as needed.
`pick`	Pick object properties and construct a new object.
`pickBy`	Extract object properties by a predicate function and construct a new object.
`omit`	Excludes object properties and constructs a new object.
`omitBy`	Excludes object properties by a predicate function and constructs a new object.
`deriveKey`	Derive new object keys by a mapping while keeping the original keys.
`mapObject`	Maps an object into a new object.
`rekey`	Rename object keys by a mapping and construct a new object.
`objectKeys`	Get an array of keys from an object, with full TypeScript type support.
`objectEntries`	Get an array of key-value pairs from an object, with full TypeScript type support.
`promiseWithResolvers`	Returns an object containing a new Promise and two functions to `resolve` or `reject` it.

Array

Function	Description
`at`	Retrieves the element at a specified index in an `array`, supporting negative indices.
`chunk`	Chunking an `array`. The passed `size` indicates the length of the chunk.
`uniq`	Creates a duplicate-free version of an `array`, using the values equality.
`uniqBy`	Creates a duplicate-free version of an `array`, using a custom comparison function.
`difference`	Creates an `array` of values not contained in other given arrays.
`differenceWith`	Creates an `array` of values not contained in other given arrays, with custom comparison.
`intersection`	Creates an `array` of unique values contained in all given arrays.
`intersectionWith`	Creates an `array` of unique values contained in all given arrays, with custom comparison.
`xor`	XOR (Exclusive OR) the passed array and return a new `array`.
`xorWith`	XOR (Exclusive OR) the passed array with custom comparison.
`groupBy`	Group the elements in a given `array` by a function's return value as the key.
`find`	Finds the `first` or `last` element in an array that meets a condition, returning the element and its index.
`shuffle`	Randomly shuffles elements within an `array`.
`removeItem`	Removes the first occurrence of a specific item from an `array`.
`removeItemBy`	Removes the first item matching a predicate, mutating the original array.
`removeItemsBy`	Removes all items matching a predicate, mutating the original array.
`toggleItem`	Adds or removes an item from an `array`, based on its existence.
`removeArrayBlank`	Removes `null` or `undefined` values from an `array`.
`removeArrayEmpty`	Removes `null`, `undefined`, or empty string (`''`) values from an `array`.
`normalizeToArray`	Converts a value to an `array` if it is not already an array.

Collection

Function	Description
`cloneDeep`	Create a deep clone of a value.
`cloneDeepWith`	Create a deep clone of a value, applying a custom function for cloning.
`merge`	Merge two objects recursively.
`mergeWith`	Merge two objects recursively, with custom merge logic.

Function

Function	Description
`NOOP`	This method returns `undefined`.
`call`	Call a single function or multiple functions and pass arguments to them.
`callOrReturn`	Calls a function with args if input is a function, otherwise returns the input directly.
`once`	Creates a function that will only execute once.
`debounce`	Create a `debounce` function that delays execution by `delay` ms after the last call.
`throttle`	Create a throttle function that calls `fn` at most once every `delay` ms.
`tryCall`	Safely call a function and return an `[error, result]` tuple.
`tryAsyncCall`	Safely call an async function and return a `Promise<[error, result]>` tuple.

File

Function	Description
`toText`	Converts a `File` object to a text string.
`toDataURL`	Converts a `File` object to a Data URL string.
`toArrayBuffer`	Converts a `File` object to an `ArrayBuffer`.

Util

Function	Description
`motion`	Used to implement basic transition animation based on `requestAnimationFrame`.
`copyText`	Copies text to the clipboard.
`download`	Trigger browser download, supporting downloading via file `url`, `Blob`, `File`.
`duration`	Creates a fluent duration builder that allows chaining time units to calculate total milliseconds or seconds.
`enumOf`	Enum utility with TS-friendly types. Built-in fields: `value`, `label`, `description`.
`storage`	Enhance `localStorage` and `sessionStorage`, support automatic JSON `stringify` and `parse`.
`classes`	Generates a list of class names based on a given condition.
`createNamespaceFn`	Creates a namespace function for BEM-style naming.
`createCacheManager`	Creates a simple in-memory cache manager with optional TTL support.
`raf`	Creates a Promise-based `requestAnimationFrame` that resolves on the next frame.
`doubleRaf`	Creates a Promise-based double `requestAnimationFrame` that resolves after two frames.
`requestAnimationFrame`	Provides a cross-browser compatible `requestAnimationFrame` function.
`cancelAnimationFrame`	Cancels a `requestAnimationFrame` request, with a fallback to `clearTimeout`.
`inViewport`	Determines if an element is visible within the viewport.
`preventDefault`	Prevents the default action of an event if it is cancelable.
`getStyle`	Retrieves computed CSS styles for a given DOM element.
`getRect`	Gets the dimensions and position of an element or window as a `DOMRect` object.
`getScrollTop`	Gets the vertical scroll position of an element or window.
`getScrollLeft`	Gets the horizontal scroll position of an element or window.
`getParentScroller`	Finds the closest scrollable ancestor of an element.
`getAllParentScroller`	Retrieves all scrollable ancestor elements of an element.
`prettyJSONObject`	Formats a `JSON` object with indentation for easy readability.
`tryParseJSON`	Attempts to parse a `JSON` string. If parsing fails, returns `undefined`.
`navigation`	Browser-level navigation API for real page jumps.

Integrated

Function	Description
`mitt`	Event emitter / pubsub. Integrated with mitt.
`uuid`	UUID generation helpers integrated with uuid.

First-party integration: Axle (`rattail/axle`)

Progressive HTTP request layer on top of axios for Vue 3 (and plain JS for the core client), re-exported as a first-party integration. Three entry points:

Entry	Import	Purpose
Core	`rattail/axle`	`createAxle`, types, `createMatcher`, helpers, interceptors
Vue	`rattail/axle/use`	`createUseAxle`, `useValues`, `useHasLoading`, `useAverageProgress`
API builder	`rattail/axle/api`	`createApi` — URL-bound `load` / `use` helpers

Upstream: @varlet/axle · README · Chinese README

IMPORTANT: Open references/axle/<topic>.md for detailed API docs, type declarations, and usage examples.

Quick start

import { createAxle } from 'rattail/axle'

const axle = createAxle(/* axios create config */)
axle.get('/url', { current: 1, pageSize: 10 }, { headers: {} })

Topic references

Topic	Reference
`createAxle`, `AxleInstance`, shared `axios`, headers, runner overview	references/axle/core-client.md
GET/POST/… runners (`getBlob`, `postUrlEncode`, …)	references/axle/request-runners.md
`createUseAxle` and composables	references/axle/vue-composition.md
`createApi` (`load`, `use`, path params)	references/axle/api-factory.md
`matchPattern`, `createMatcher`, interceptors	references/axle/interceptors-and-matcher.md
`withResponse`, `download`	references/axle/helpers.md

Peer dependency: vue ^3.2 when using rattail/axle/use or rattail/axle/api.

First-party integration: Ruler Factory (`rattail/ruler-factory`)

Flexible chainable validation rule factory for TypeScript/JavaScript, re-exported as a first-party integration. Supports UI form integration with Varlet, Vant, Naive UI, Element Plus.

import { rulerFactory } from 'rattail/ruler-factory'

Upstream: ruler-factory · README · Chinese README

IMPORTANT: Before chaining rules, read the reference for rulerFactory and your UI's generator pattern, then open the specific references/ruler-factory/<name>.md for the method or type you use.

Quick start

import { rulerFactory } from 'rattail/ruler-factory'

const r = rulerFactory((validator) => {
  return (value) => {
    const e = validator(value)
    return e ? e.message : true
  }
})

r().string('Not a string').required('Required').min(2, 'Too short').done()

API index

Package

Symbol	Description
`rulerFactory`	Factory that builds a chainable ruler for your UI rule format.

Exported types

Symbol	Description
`RulerFactoryMessage`	String or lazy string for error messages.
`RulerFactoryValidator`	Validator fn: value in, Error or undefined out.
`RulerFactoryGenerator`	Maps validator + params to rule type R.
`RulerContext`	Chainable context type (methods + extend).

Type guards

Symbol	Description
`string`	Assert string type (optional message).
`number`	Assert number type.
`array`	Assert array type.
`boolean`	Assert boolean type.
`object`	Assert plain object type.
`symbol`	Assert symbol type.
`bigint`	Assert bigint type.
`null`	Assert value is null.
`undefined`	Assert value is undefined.
`true`	Assert value is true.
`false`	Assert value is false.

Validators

Symbol	Description
`required`	Reject empty values (rattail isEmpty).
`min`	Min length / numeric min depending on type.
`max`	Max length / numeric max depending on type.
`length`	Exact length for string or array.
`regex`	String matches RegExp.
`startsWith`	String starts with prefix.
`endsWith`	String ends with suffix.
`includes`	Substring or array includes value.
`uppercase`	String is all uppercase.
`lowercase`	String is all lowercase.
`email`	String looks like an email.
`gt`	Number/bigint greater than.
`gte`	Number/bigint greater or equal.
`lt`	Number/bigint less than.
`lte`	Number/bigint less or equal.
`positive`	Number/bigint > 0.
`negative`	Number/bigint < 0.
`uniq`	Array has no duplicates.
`uniqBy`	Array unique by comparator.

Predicates

Symbol	Description
`is`	Custom predicate must pass.
`not`	Custom predicate must fail.

Finish

Symbol	Description
`done`	Return built rules array.

Custom

Symbol	Description
`addRule`	Append custom validator.
`getMessage`	Resolve message string/lazy fn.

Transform

Symbol	Description
`trim`	Trim strings before validation.
`toLowerCase`	Lowercase strings before validation.
`toUpperCase`	Uppercase strings before validation.
`transform`	Replace transformer with custom fn.
`transformer`	Current transform pipeline (internal hook).

…(truncated)

Varletjs Rattail Rattail

File contents

Rattail

CLI (`rt`)

Commands

Quick start

Programmatic usage

Core functions

General

Number

String

Math

Object

Array

Collection

Function

File

Util

Integrated

First-party integration: Axle (`rattail/axle`)

Quick start

Topic references

First-party integration: Ruler Factory (`rattail/ruler-factory`)

Quick start

API index

Package

Exported types

Type guards

Validators

Predicates

Finish

Custom

Transform

Frequently asked questions

Varletjs Rattail Rattail

File contents

Rattail

CLI (rt)

Commands

Quick start

Programmatic usage

Core functions

General

Number

String

Math

Object

Array

Collection

Function

File

Util

Integrated

First-party integration: Axle (rattail/axle)

Quick start

Topic references

First-party integration: Ruler Factory (rattail/ruler-factory)

Quick start

API index

Package

Exported types

Type guards

Validators

Predicates

Finish

Custom

Transform

Related skills

Frequently asked questions

How do I install the Varletjs Rattail Rattail skill?

What does the Varletjs Rattail Rattail skill do?

Is Varletjs Rattail Rattail safe to use?

Which AI agents work with Varletjs Rattail Rattail?

Is Varletjs Rattail Rattail free to use?

Who published Varletjs Rattail Rattail?

CLI (`rt`)

First-party integration: Axle (`rattail/axle`)

First-party integration: Ruler Factory (`rattail/ruler-factory`)