Topkat Utils

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A powerful collection of utility functions for JavaScript/TypeScript projects. Fast, functional, and fully typed.

Installation

npm install topkat-utils
# or
yarn add topkat-utils

Error handler

• DescriptiveError(value, type): Improves JS Error class by adding a way to add extraInformations to error, which is a must have in the context of debugging and logging the right informations

// Example usage
try {
  if(user.age < 18) {
    throw new DescriptiveError('Not allowed', { age: user.age, code: 403, ...additionalInfosToDisplayInLogs })
  }
} catch (error) {
  // Error message: "Expected number, got string: '25'"
  C.error(error.message) //
  C.error(error.logs) // display logs as string array
  C.error(error.errorDescription) // display all extraInfos / options provided as second param
}

Logger

• C: all in one logger util

// Basic usage
C.log('Hello World')   // [INFO] Hello World
C.info('Info!')        // [INFO] Info! Usually blue

// Errors and warning will take the most informations out of your errors and does particularly fit with DescriptiveError() class
C.error('Oops!')       // [ERROR] Oops! Error: Something went wrong\nat doSomething (/app/src/utils.js:42:15)...
C.error(false, 'Oops!')// Error without stack trace
C.warning('Warning!')     // [WARN] Warning! Error: Something went wrong\nat doSomething (/app/src/utils.js:42:15)...
C.warning(false, 'Warning!') // Same without stack trace

// With objects parsing
C.log({ user: 'John', age: 30 }) // [INFO] { user: 'John', age: 30 }
// Terminal custom colors
C.log(C.red('Hello') + C.dim('World') + C.green('of') + C.logClr('Typescript', [0, 255, 150]))

C.success('Successfully built') // Color green `'✓ Successfully built'`

C.clearLastLines(2) // clears the last two lines of the terminal

• perfTimer(): Util to measure performances

const time = perfTimer()

for(let i = 0; i < 9999;i++) longProcess()

console.log('Process took ' + time.end()) // 'Process took 2.22 seconds

• cliProgressBar
• cliLoadingSpinner
• removeCircularJSONstringify(str): convert circular structures to valid JSON // TypeError: Converting circular structure to JSON

Core Utilities

Value Checking & Validation

• validator(value, type): Type validation utility. Will throw an error if not valid. If you prefer that the function returns an error array, use validatorReturnErrArray

validator(
    { value: 3, type: 'number', gte: 1, lte: 3 },
    { name: 'email', value: '[e-mail]', regexp: /[^\s@]+@[^\s@]+\.[^\s@]/},
)

• isset(value): Check if a value is defined and not null (ignores other falsy values)
• isEmpty(value): Check if a value is empty
• isObject(value): Check if value is a plain object (not null, not Date, not array, etc.)

Object Manipulation

• deepClone(obj): Deep clone objects, useful when you want to manipulate object with subobjects without modifying any references to those objects
• mergeDeep(obj1, obj2): Deep merge objects
• objForceWrite(obj, 'user.address.line1', addressVar), objForceWriteIfNotSet(): Forces a path to be written in nested object and create subObjects if necessary
• flattenObject(obj): Flatten nested objects with pros as dot notation

// Example of flattenObject
const nested = {
  user: {
    name: 'John',
    address: {
      street: '123 Main St',
      city: 'New York'
    }
  },
  settings: {
    theme: 'dark'
  }
}

const flattened = flattenObject(nested)
// Result:
// {
//   'user.name': 'John',
//   'user.address.street': '123 Main St',
//   'user.address.city': 'New York',
//   'settings.theme': 'dark'
// }

• unflattenObject(obj): Unflatten objects back to nested structure
• objFilterUndefined(obj): Remove undefined values from object
• findByAddress(obj, path): Get value by dot notation path

const obj = {
  user: {
    profile: {
      name: 'John'
    }
  }
}

findByAddress(obj, 'user.profile.name') // 'John'
findByAddress(obj, 'user.settings.theme') // undefined

Array Operations

• shuffleArray(array): Randomize array order
• randomItemInArray(array): Get random item from array
• pushIfNotExist(array, item): Push item if not already present
• noDuplicateFilter(array): Remove duplicates from array
• getArrayInCommon(arr1, arr2): Get common elements between arrays
• getArrayDiff(arr1, arr2): Get difference between arrays
• arrayCount(arr, 'stringInstance'): Count number of occurence of item in array

Number Operations

• isBetween(value, min, max): Check if a number is within a range
• random(min, max): Generate random number between two values
• minMax(value, min, max): Clamp a number between min and max values
• average(array): Calculate average of array values
• sumArray(array): Sum values in an array
• round(number, nbDecimals): Round number to X decimal places
• round2(number): Round number to 2 decimal places

String Manipulation

• miniTemplater(template, data): Simple template engine

// Basic usage
miniTemplater('Hello {{name}}!', { name: 'John' }) // 'Hello John!'

• cln(value): Clean string for printing (undefined, null, NaN)
• pad(number, length): Pad numbers with leading zeros
• generateToken(length, isUnique, mode): Generate random tokens (not to use un security workflows)
• convertAccentedCharacters(str, options): Eg: 'éçàÉ' => 'ecaE'. Convert accented characters to non-accented with options to remove spaces or numbers
• nbOccurenceInString(str, occurence)

Loop Operations

• forI, forIAsync: A mix between js for(let i = ....i++) loop and a map. Iterates over a specified number of times, passing each iteration's result to the next callback

// Generate Fibonacci sequence
forI(8, (i, previousItem, results) => {
  if (i <= 1) return 1
  return results[i-1] + results[i-2]
})
// Returns: [1, 1, 2, 3, 5, 8, 13, 21]

• recursiveGenericFunction, recursiveGenericFunctionSync: The simplest way do iterate recursively on every item of an object

recursiveGenericFunctionSync(
    { a: { b: true } }, // object OR array
    (item, addr, lastElementKey, parent) => {
        C.log(item)           // true
        C.log(addr)           // 'a.b'
        C.log(lastElementKey) // 'b'
        C.log(parent)         // { a: { b: 3 } }
        C.log(findByAddress(addr)) // true // just aother way to get the value
        return false
    }
)

Date Operations

• getDateAsInt(date): Convert date to integer format (20290101)
• dateOffset(date, offset): Add time offset to date
• getDuration(start, end): Calculate duration between dates
• isWeekend(date): Check if date is weekend
• firstDayOfMonth(date): Get first day of month
• lastDayOfMonth(date): Get last day of month

URL & Path Operations

• urlPathJoin(...paths): Join URL paths (like path.join but for URLs)

// Handles double slashes correctly
urlPathJoin('https://api.example.com//v1', '/users/', 'userId') // => 'https://api.example.com/v1/users/userId'

• escapeRegexp(str): Will escape all special character in a string to output a valid regexp string to put in RegExp(myString)
  • Eg: from 'path.*.addr(*)' will output 'aa\..*?\.addr\(.*?\)' so regexp match 'path.random.addr(randomItem)'

Case Conversion

• camelCaseify(str): Replace 'hello-world', 'hello World', 'hello_World', 'helloWorld' => 'helloWorld'
• capitalize1st(string): helloWorld => HelloWorld
• camelCase([word1, word2]): Convert to camelCase
• snakeCase([word1, word2]): Convert to snake_case
• kebabCase([word1, word2]): Convert to kebab-case
• pascalCase([word1, word2]): Convert to PascalCase
• titleCase([word1, word2]): Convert to Titlecase

Additional Utilities

Environment & Configuration

• ENV: shortcut to process.env. Parse boolean and number values
• parseBool(value): Parse boolean values

Async Operations

• timeout(ms): Promise-based timeout

Object Control

• readOnly(obj): Lock all 1st level props of an object to read only (not rewritable / modifiable)
• reassignForbidden(obj): Fields of the object can be created BUT NOT reassignated
• readOnlyRecursive(obj): All fields and subFields of the object will be readOnly
• createProxy(obj): replace new Proxy(...) from javascript with correct handling for JSON.stringify and a __isProxy: true helper prop

Typescript equivalent of Js functions (Fix types)

• lowerCase(str): lowerCase('HelloWorld' as const) // type: 'helloworld' (Equivalent of type LowerCase<MyString>)
• upperCase(str): upperCase('HelloWorld' as const) // type: 'HELLOWORLD' (Equivalent of type UpperCase<MyString>)
• objEntries(obj): In JS object entries are not correctly typed (Object.entries({ a: 1, b: true }) // type: [string, number | boolean]). With this function we are typed like objEntries({ a: 1, b: true }) // ["a", number] | ["b", boolean]
• objKeys: In JS object keys are not correctly typed (Object.keys({ a: 1, b: 2 }) // type: string). With this function we are typed like objKeys({ a: 1, b: 2 }) // type: 'a' | 'b'
• includes(str): Fix this always happening ts error when using includes and your search string is not typed as an array element (which is very dumb IMO)

Configuration

Place that at the top of your code

registerConfig({
  terminal: {
    // Custom colors for terminal logs
    theme: {...},
    // disable colors in case your logs are outputted as plain text
    noColor: true,
  },
  // if you use topkatUtils as a logger and error handler
  // onError custom callback
  onError: () => { /**  */ },
  /** Exemple of preprocessing log */
  preprocessLog(log: string) { return 'MyAppName: ' + Date.now() + ' ' + log }
})

TypeScript Support

This library is fully typed and provides TypeScript definitions out of the box. Every Util is documented via JsDoc and documentation should appear on hover in your IDE

Contributing

Contributions are welcome! Please feel free to submit a Pull Request

License

MIT

Support

If you need help or have questions, please open an issue on GitHub.