Checkard.js is an open source dynamic type checking library for Javascript, Typescript and Node.js to test if a given variable is what it is supposed to be ( Function, object, ascii, boolean, integer, string, json, email...)
- No dependency
- Very lightweight
- Thoroughly tested
- Works in Javascript, Typescript and Node.js
- Can be used as CommonJS module, EcmaScrypt module or IIFE
- Old browsers support
- android: 2.2,
- chrome: 34,
- edge: 12,
- firefox: 11,
- ie: 9,
- ios: 4.2,
- opera: 28,
- safari: 5.1,
- samsung: 4,
- Node.js: 14
Those are the oldest targeted versions. The library should work properly on older devices but we do not support it officially.
$ npm i @dwtechs/checkardimport { isFunction, isArray, isString } from "@dwtechs/checkard";
if (isFunction(variable)) {
//variable is a function
}
if (!isArray(variable, '=', 2)) {
//variable is not an array of length 2
}
if (!isString(variable)) {
// variable is not a string
}
if (isString(variable, "!0")) {
// variable is a string and is not empty
}
if (isString(variable, ">", 2)) {
// variable is a string of length greater than 2
}const ch = require("@dwtechs/checkard");
// you may need to use "require("@dwtechs/checkard/dist/ch"); with Node.js old versions"
if (ch.isFunction(variable)) {
//variable is a function
}
if (!ch.isArray(variable, '=', 2)) {
//variable is not an array of length 2
}
if (!ch.isString(variable)) {
// variable is not a string
}
if (ch.isString(variable, "!0")) {
// variable is a string and is not empty
}
if (ch.isString(variable, ">", 2)) {
// variable is a string of length greater than 2
}<script src="node_modules/@dwtechs/checkard/dist/ch.iife.min.js"></script>if (ch.isFunction(variable)) {
//variable is a function
}
if (!ch.isArray(variable, '=', 2)) {
//variable is not an array of length 2
}
if (!ch.isString(variable)) {
// variable is not a string
}
if (ch.isString(variable, "!0")) {
// variable is a string and is not empty
}
if (ch.isString(variable, ">", 2)) {
// variable is a string of length greater than 2
}type Comparator = '='|'<'|'>'|'<='|'>='|'!='|'!0'|'0';
type PasswordOptions = {
lowerCase: boolean,
upperCase: boolean,
number: boolean,
specialCharacter: boolean,
maxLength: number,
minLength: number
}primitive methods accept any variable as parameter in order to check its type.
/**
* Checks if the given value is a boolean.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is a boolean, otherwise false.
*/
isBoolean(v: unknown): v is boolean {}
/**
* Checks if the given value is a number and optionally check its length.
* If type checking = false, string values like '4', '0', '8e4', '+true', '0x44' return true
*
* @param {unknown} v - The value to check.
* @param {boolean} [type=true] - A boolean indicating whether to perform type checking. Defaults to true.
* @param {Comparator | null} [comparator=null] - An optional comparator to compare the value. Defaults to null.
* @param {number | null} [limit=null] - An optional limit to compare the value against. Defaults to null.
* @returns {boolean} True if the value is a number and passes all checks, otherwise false.
*/
isNumber
v: unknown,
type = true,
comparator = null,
limit = null
): v is number {}
/**
* Checks if the given value is a string and optionally checks its length.
*
* @param {unknown} v - The value to check.
* @param {Comparator | null} [comparator=null] - An optional comparator to compare the string length.
* @param {number | null} [limit=null] - An optional limit to compare the string length against.
* @returns {boolean} True if the value is a string and meets the limit conditions, otherwise false.
*/
isString(
v: unknown,
comparator = null,
limit = null
): v is string {}
/**
* Checks if the provided value is a symbol.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is a symbol, otherwise false.
*/
isSymbol(v: unknown): v is symbol {}
/**
* Checks if the given value is null or undefined.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is null or undefined, otherwise false.
*/
isNil(v: unknown): v is null | undefined {}
/**
* Checks if the given value is null.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is null, otherwise false.
*/
isNull(v: unknown): v is null {}
/**
* Checks if the given value is undefined.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is undefined, otherwise false.
*/
isUndefined(v: unknown): v is undefined {}Usage example for isString method:
import { isString } from "@dwtechs/checkard";
const str = 'dog';
if (isString(str)) {
// check if str is a string
}
if (isString(str, '!0')) {
// check if str is not empty
}
if (isString(str, '0')) {
// check if str is empty
}
if (isString(str, '=', 2)) {
// check if str is a string of length 2
}
if (isString(str, '>=', 1)) {
// check if str is a string of length greater than or equal to 1
}If isString() returns false, Typescript will consider str is not a string.
So if you need to check if str is of length x but needs to be considered as a string even if its length is not x you should do it like this:
import { isString, isStringOfLength } from "@dwtechs/checkard";
const str = 'dog';
if (isString(str) && !isStringOfLength(str, 4, 4)) {
// string is of type string even if length is not 4
}Non-primitive methods accept any variable as parameter in order to check its type.
/**
* Checks if the given value is an object and optionally if it is not empty.
*
* @template T - The expected type of the object.
* @param {unknown} v - The value to check.
* @param {boolean} [empty=false] - If true, the function will also check if the object is not empty.
* @returns {o is object & T} True if the value is an object (and not empty if specified), otherwise false.
*/
isObject<T = unknown>(
o: unknown,
empty = false
): o is object & T {}
/**
* Checks if the given value is an array and optionally compares its length.
*
* @template T - The type of elements in the array.
* @param {unknown} v - The value to check.
* @param {Comparator | null} [comparator=null] - An optional comparator function to compare the array length.
* @param {number | null} [limit=null] - An optional limit to compare the array length against.
* @returns {boolean} True if the value is an array and meets the limit conditions, otherwise false.
*/
isArray<T = unknown>(
v: unknown,
comparator = null,
limit = null
): v is T[] {}
/**
* Checks if the given input is a valid JSON string.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the input is a valid JSON string, otherwise false.
*/
isJson(v: unknown): v is JSON {}
/**
* Checks if the given value is a regular expression.
*
* @param {unknown} v - The value to check.
* @param {boolean} [type=true] - A boolean indicating whether to perform type checking. Defaults to true.
* If false, String values like '/^abc$/' are considered as regular expressions.
* @returns {boolean} True if v is a RegExp or can be converted to a RegExp, otherwise false.
*/
isRegex(v: unknown, type = true): v is RegExp {}
/**
* Checks if the given value is a valid Date object.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is a Date object, otherwise false.
*
*/
isDate(v: unknown): v is Date {}
/**
* Checks if the provided value is a function.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is a function, otherwise false.
*/
isFunction(v: unknown): v is (...args: unknown[]) => unknown {}Usage example for isArray method:
import { isArray } from "@dwtechs/checkard";
let arr = ['dog','cat','bird'];
if (isArray(arr)) {
// check if arr is an array
}
if (isArray(arr, '!0')) {
// arr is not empty
}
if (isArray(arr, '=', 2)) {
// arr is an array of length 2
}
if (isArray(arr, '>=', 1)) {
// arr is an array of length greater than or equal to 1
}Note that if isArray() returns false Typescript will consider arr is not an array.
So if you need to check arr is of length x but needs to be considered as an array even if its length is not x you can do it like this:
import { isArray, isArrayOfLength } from "@dwtechs/checkard";
let arr = ['dog','cat','bird'];
if (isArray(arr) && !isArrayOfLength(arr, 4, 4)) {
// array is of type array even if length is not 4
}/**
* Checks if a value is falsy.
*
* A value is considered falsy if it is :
* false,
* 0,
* -0,
* "",
* null,
* undefined,
* NaN,
* 0n.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is falsy, otherwise false.
*/
function isFalsy(v: unknown): boolean {}
/**
* Checks if a value is truthy.
*
* A value is considered truthy if it is :
* true: The boolean value true.
* Non-zero numbers: Any number other than 0 or -0.
* Non-empty strings: Any string with at least one character.
* Objects: Any object, including empty objects and arrays.
* Symbols: Any symbol.
* BigInt values: Any BigInt value other than 0n.
*
* @param {unknown} v - The value to check.
* @returns {boolean} True if the value is truthy, otherwise false.
*/
function isTruthy(v: unknown): boolean {}/**
* Checks if a given number is an integer.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is an integer, otherwise false.
*/
isInteger(n: number | string, type = true): boolean {}
/**
* Checks if a given number is a floating-point number.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is a floating-point number, otherwise false.
*/
isFloat(n: number | string, type = true): boolean {}
/**
* Checks if a given number is even.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is an even integer, otherwise false.
*/
isEven(n: number | string, type = true): boolean {}
/**
* Determines if a given number is odd.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is an odd integer, otherwise false.
*/
isOdd(n: number | string, type = true): boolean {}
/**
* Checks if a given number is zero.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is zero, otherwise false.
*/
isOrigin(n: number | string, type = true): boolean {}
/**
* Checks if a given number is positive.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is positive, otherwise false.
*
* @remarks
* This function also check if the value is a number.
*/
isPositive(n: number | string, type = true): boolean {}
/**
* Checks if a given number is negative.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is negative, otherwise false.
*
* @remarks
* This function also check if the value is a number.
*/
isNegative(n: number | string, type = true): boolean {}
/**
* Checks if a given number is a power of two.
*
* @param {number | string} n - The number to check.
* @param {boolean} [type=true] - Optional boolean indicating whether to perform type checking. Defaults to true.
* @returns {boolean} True if the number is a power of two, otherwise false.
*/
isPowerOfTwo(n: number | string, type = true): boolean {}
/**
* Checks if a given number is an ASCII code.
*
* @param {number} n - The number to check.
* @param {boolean} [ext=true] - Optional boolean to include extended ASCII range (0-255). Defaults to true.
* @returns {boolean} True if the number is a valid ASCII code, otherwise false.
*/
isAscii(n: number, ext = true): boolean {}Valid number methods take a number as parameter and check of the number lies in the right interval
/**
* Checks if a given value is a valid number within given range.
*
* @param {number | string} n - The number to check
* @param {number} [min=-999999999] - minimal value of the range
* @param {number} [max=999999999] - maximal value of the range
* @param {boolean} [type=true] - whether to perform type checking
* @returns {boolean} True if the value is a valid number, otherwise false.
*
* @remarks
* This function also check if the value is a number.
*/
isValidNumber(
n: number | string,
min = -999999999,
max = 999999999,
type = true
): boolean {}
/**
* Checks if a given value is a valid integer within given range.
*
* @param {number | string} n - The number to check
* @param {number} [min=-999999999] - minimal value of the range
* @param {number} [max=999999999] - maximal value of the range
* @param {boolean} [type=true] - whether to perform type checking
* @returns {boolean} True if the value is a valid integer, otherwise false.
*/
isValidInteger(
n: number | string,
min = -999999999,
max = 999999999,
type = true
): boolean {}
/**
* Checks if a given value is a valid float within given range.
*
* @param {number | string} n - The number to check
* @param {number} [min=-999999999.9] - minimal value of the range
* @param {number} [max=999999999.9] - maximal value of the range
* @param {boolean} [type=true] - whether to perform type checking
* @returns {boolean} True if the value is a valid float, otherwise false.
*/
isValidFloat(
n: number | string,
min = -999999999.9,
max = 999999999.9,
type = true
): boolean {}/**
* Checks if the length of a given string is within the specified range.
*
* @param {string} s - The string to check.
* @param {number} [min=0] - The minimum length of the string (inclusive). Default is 0.
* @param {number} [max=999999999] - The maximum length of the string (inclusive). Default is 999999999.
* @returns {boolean} True if the string length is within the specified range, otherwise false.
*/
isStringOfLength(
s: string,
min = 0,
max = 999999999
): boolean {}
/**
* Checks if the given string is a valid email address.
*
* @param {string} s - The string to be checked.
* @returns {boolean} True if the string is a valid email address, otherwise false.
*/
isEmail(s: string): boolean {}
/**
* Checks if the given string is a valid IP address.
*
* @param {string} s - The string to be checked.
* @returns {boolean} True if the string is a valid IP address, otherwise false.
*/
isIpAddress(s: string): boolean {}
/**
* Checks if a given string is a valid Base64 encoded string.
*
* @param {string} s - The string to check.
* @param {boolean} [urlEncoded=false] - Optional. If true, checks for URL-safe Base64 encoded strings. Defaults to false.
* @returns {boolean} True if the string is a valid Base64 encoded string, otherwise false.
*/
isBase64(s: string, urlEncoded = false): boolean {}
/**
* Checks if a given string is a valid JSON Web Token (JWT).
*
* A valid JWT consists of three parts separated by dots ('.'):
* - Header
* - Payload
* - Signature
*
* Each part must be a valid Base64 encoded string. Additionally, the header and payload
* must be valid JSON objects when decoded.
*
* @param {string} s - The string to check.
* @returns {boolean} True if the string is a valid JWT, otherwise false.
*/
isJWT(s: string): boolean {}
/**
* Checks if the given string is a valid slug.
*
* A slug is typically a URL-friendly string that contains only lowercase letters, numbers, and hyphens.
*
* @param {string} s - The string to check.
* @returns {boolean} True if the string is a valid slug, otherwise false.
*/
isSlug(s: string): boolean {}
/**
* Checks if the given string is a valid hexadecimal number.
*
* @param {string} s - The string to check.
* @returns {boolean} True if the string is a valid hexadecimal number, otherwise false.
*/
isHexadecimal(s: string): boolean {}
const PwdDefaultOptions = {
lowerCase: true,
upperCase: true,
number: true,
specialCharacter: true,
minLength: 12,
maxLength: 64,
};
/**
* Checks if a given password string meets the specified validation criteria.
*
* @param {string} s - The password string to validate.
* @param {PasswordOptions} [options=PwdDefaultOptions] - Optional configuration object to specify password validation criteria.
* @returns {boolean} True if the password meets all the specified criteria, otherwise false.
*
* @example
* const options = {
* minLength: 8,
* maxLength: 20,
* lowerCase: true,
* upperCase: true,
* number: true,
* specialCharacter: true
* };
* const isValid = isValidPassword('Password123!', options);
*/
isValidPassword(
s: string,
options = PwdDefaultOptions
): boolean {}
/**
* Checks if the given string contains any uppercase letters.
*
* @param {string} s - The string to check.
* @returns {boolean} True if the string contains at least one uppercase letter, otherwise false.
*/
containsUpperCase(s: string): boolean {}
/**
* Checks if the given string contains at least one lowercase letter.
*
* @param {string} s - The string to check.
* @returns {boolean} True if the string contains at least one lowercase letter, otherwise false.
*/
containsLowerCase(s: string): boolean {}
/**
* Checks if the given string contains any special characters.
*
* @param {string} s - The string to be checked.
* @returns {boolean} True if the string contains special characters, otherwise false.
*/
containsSpecialCharacter(s: string): boolean {}
/**
* Checks if a given string contains a specified number of digits.
*
* @param {string} s - The string to check.
* @param {number} [min=1] - The minimum number of digits required in the string. Defaults to 1.
* @param {number|null} [max=null] - The maximum number of digits allowed in the string. If not provided, there is no upper limit.
* @returns {boolean} True if the string contains the required number of digits, otherwise false.
*/
containsNumber(
s: string,
min = 1,
max = null
): boolean {}String methods take a string as parameter.
Use isString() method before any string method if you are not sure about the variable type you will receive.
Example :
import { isString, isEmail } from "@dwtechs/checkard";
if (isString(value) && isEmail(value)) {
// value is an email
}Usage example for isValidPassword:
import { isValidPassword } from "@dwtechs/checkard";
const PwdOptions = {
lowerCase: true,
upperCase: true,
number: true,
specialCharacter: false,
minLength: 12,
maxLength: 16,
};
const password = 'teSt1234';
if (isValidPassword(password, PwdOptions)) {
// check if password is valid compared to PwdOptions
}const minDate = new Date('1/1/1900');
const maxDate = new Date('1/1/2200');
/**
* Checks if a given date is valid within a specified range.
*
* @param {Date} d - The date to be validated.
* @param {Date} [min=minDate] - The minimum allowable date. Defaults to `minDate`.
* @param {Date} [max=maxDate] - The maximum allowable date. Defaults to `maxDate`.
* @returns {boolean} True if the date is valid and within the specified range, otherwise false.
*
* @remarks
* This function also check if the value is an instance of the Date object.
*/
isValidDate(
d: date,
min = minDate,
max = maxDate
): boolean {}
/**
* Checks if the given number is a valid timestamp.
*
* @param {number} t - The number to check.
* @param {boolean} [type=true] - An optional boolean parameter to verify the type of t. Defaults to true.
* @returns {boolean} True if the value is a timestamp, otherwise false.
*/
isTimestamp(t: number, type = true): boolean {}
/**
* Checks if a given timestamp is valid within a specified range.
*
* @param {number} t - The timestamp to validate.
* @param {number} [min=-2208989361000] - The minimum allowed timestamp. Default is -2208989361000,eg 1/1/1900.
* @param {number} [max=7258114800000] - The maximum allowed timestamp. Default is 7258114800000, eg 1/1/2200).
* @param {boolean} [type=true] - A boolean indicating the type of timestamp. Default to true.
* @returns {boolean} True if the timestamp is valid and within the specified range, otherwise false.
*
* @remarks
* This function also check if the value is timestamp.
*/
isValidTimestamp(
t: number,
min = -2208989361000,
max = 7258114800000,
type = true
): boolean {} /**
* Checks if the length of an array is within the specified range.
*
* @param {unknown[]} a - The array to check.
* @param {number} [min=0] - The minimum length of the array (inclusive).
* @param {number} [max=999999999] - The maximum length of the array (inclusive).
* @returns {boolean} True if the array length is within the specified range, otherwise false.
*/
isArrayOfLength(
a: unknown[],
min = 0,
max = 999999999
): boolean {}
/**
* Checks if a value is present in an array starting from a specified index.
*
* @param {unknown[]} a - The array to search within.
* @param {unknown} v - The value to search for.
* @param {number} [from=0] - The index to start the search from. Defaults to 0.
* @returns {boolean} True if the value is found in the array, otherwise false.
*/
isIn(
a: unknown[],
v: unknown,
from = 0
): boolean {}Usage example :
import { isIn } from "@dwtechs/checkard";
// an array of restricted values
const levels = [ "error", "warn", "info", "debug" ];
// Basic usage :
console.log(isIn("debug", levels)); // true
console.log(isIn("debag", levels)); // false
// Typical usage :
const defaultLvl = "warn";
function setLevel(level: Levels): Levels {
return isIn(level, levels) ? level : defaultLvl;
}
let lvl = setLevel("error"); // lvl = "error"
let lvl = setLevel("infos"); // lvl = "warn"/**
* Checks if a given property exists on an object.
* enumerable: boolean - whether to check enumerable properties only
*
* @template K - The type of the property key.
* @param {object} obj - The object to check the property on.
* @param {K} k - The property key to check for.
* @param {boolean} [own=true] - If true, checks if the property is an own property of the object. Defaults to true.
* @param {boolean} [enumerable=true] - If true, checks if the property is enumerable. Defaults to true.
* @returns {boolean} True if the property exists on the object based on the specified conditions, otherwise false.
*/
isProperty<K extends PropertyKey>(
obj: { [key: string]: unknown },
k: K,
own = true,
enumerable = true
): boolean // obj is Record<K, { [key: PropertyKey]: unknown }>Usage example :
import { isProperty } from "@dwtechs/checkard";
// an object to describe the custom type.
const levels = {
error: 0,
warn: 1,
info: 2,
debug: 3,
};
// Basic usage :
console.log(isProperty("debug", levels)); // true
console.log(isProperty("debag", levels)); // false/**
* Checks if the given value is an HTML element.
*
* @param {unknown} h - The value to check.
* @returns {boolean} True if the value is an HTML element, otherwise false.
*/
isHtmlElement(h: unknown): h is HTMLElement {}
/**
* Checks if a given string is a valid HTML event attribute.
*
* @param {sgtring} h - The string to check.
* @returns {boolean} True if the string is a valid HTML event attribute, otherwise false.
*
* @remarks
* This function checks against a predefined list of HTML event attributes such as `onclick`, `onload`, `onerror`, etc.
*
* @example
* ```typescript
* isHtmlEventAttribute("onclick"); // returns true
* isHtmlEventAttribute("onunknown"); // returns false
* ```
*/
isHtmlEventAttribute(h: string): boolean {}
/**
* Checks if the given value is a DOM Node.
*
* @param {unknown} n - The value to check.
* @returns {boolean} True if the value is a Node, otherwise false.
*/
isNode(n: unknown): n is Node {}/**
* A function to capitalize the first letter of each word in a string.
*
* @param {string} s - The input string to capitalize.
* @param {boolean} everyWords - A flag to indicate whether to capitalize the first letter of every word or just the first letter of the whole string.
* @return {string} The string with the first letter of each word capitalized.
*/
ucfirst(s: string, everyWords = true): string {}
/**
* Returns a normalized nickname for a user.
*
* If the nickname is not given, the function will create a nickname
* based on the first letter of the first name and the last name.
*
* nickname accepts a-z - and _ characters
*
* @param {string} nickname - The nickname of the user.
* @param {string} firstName - The first name of the user.
* @param {string} lastName - The last name of the user.
* @return {string | false} The normalized nickname.
*/
normalizeNickname(
nickname: string,
firstName: string,
lastName: string
): string | false {}
/**
* Normalizes a name by capitalizing the first letter of each word.
*
* @param {string} s - The name to normalize.
* @return {string | false} The normalized name.
*/
normalizeName(s: string): string | false {}
/**
* A function to normalize an email address.
*
* If the string is not a valid email address, the function will return false.
*
* @param {string} s - The email address to normalize.
* @return {string | false} The normalized email address or false if the
* string is not a valid email address.
*/
normalizeEmail(s: string): string | false {}Example :
const ch = require("@dwtechs/checkard");
function normalizeInputs(req, res, next) {
const users = req.body.rows;
log.debug(`Normalize values for ${users.length} users`);
for (const u of users) {
const { firstName, lastName, nickname, email } = u;
u.firstname = ch.normalizeName(firstName);
u.lastname = ch.normalizeName(lastName);
u.nickname = ch.normalizeNickname(nickname, firstName, lastName);
u.email = ch.normalizeName(email);
}
next();
}/**
* Decodes a base64 encoded string.
*
* @param {string} str - The base64 encoded string to decode.
* @param {boolean} urlSafe - A boolean indicating if the input string is URL safe. Defaults to true.
* @returns {string} The decoded string in UTF-8 format.
*/
function b64Decode(str: string, urlSafe = true): string;
/**
* Encodes a given string into Base64 format.
*
* @param {string} str - The string to be encoded.
* @param {boolean} urlSafe - Optional boolean to determine if the output should be URL safe. Defaults to true.
* @returns {string} The Base64 encoded string. If `urlSafe` is true, the output will be modified to be URL safe.
*/
function b64Encode(str: string, urlSafe = true): string;Checkard.js is under continuous development and we would be glad to get all the help you can provide. To contribute please read contributor.md for detailed installation guide.
| Purpose | Choice | Motivation |
|---|---|---|
| repository | Github | hosting for software development version control using Git |
| package manager | npm | default node.js package manager |
| language | TypeScript | static type checking along with the latest ECMAScript features |
| module bundler | Rollup | advanced module bundler for ES6 modules |
| unit testing | Jest | delightful testing with a focus on simplicity |