@jest/get-type

What is @jest/get-type?

@jest/get-type is a utility package used to determine the type of a given value. It is commonly used in testing environments to help identify the type of variables and ensure that they match expected types.

What are @jest/get-type's main functionalities?

Determine Type of a Value

This feature allows you to determine the type of a given value. In the code sample, the type of the string 'Hello, World!' is determined to be 'string'.

const getType = require('@jest/get-type');

const value = 'Hello, World!';
const type = getType(value);
console.log(type); // Output: 'string'

Type Checking in Tests

This feature is useful for type checking within tests. The code sample demonstrates a function that checks if a value matches an expected type using @jest/get-type.

const getType = require('@jest/get-type');

function checkType(value, expectedType) {
  return getType(value) === expectedType;
}

console.log(checkType(123, 'number')); // Output: true
console.log(checkType({}, 'object')); // Output: true

Other packages similar to @jest/get-type

typeof

The 'typeof' operator in JavaScript is a built-in feature that provides similar functionality to @jest/get-type by returning a string indicating the type of the unevaluated operand. However, it is limited to basic types and does not handle complex types like arrays or null as effectively as @jest/get-type.

lodash

Lodash is a popular utility library that includes a variety of functions for type checking, such as _.isString, _.isNumber, and _.isArray. While it offers more comprehensive utility functions beyond type checking, it is larger in size compared to @jest/get-type, which is focused solely on type determination.

type-detect

Type-detect is a library that provides more detailed type detection than the native 'typeof' operator. It offers similar functionality to @jest/get-type, with the ability to distinguish between different object types, such as arrays and dates. It is a lightweight alternative for type detection.

README

The README file is missing

Changelog

30.0.1

Features

• [jest-resolver] Implement the defaultAsyncResolver (#15679)

Fixes

• [jest-resolver] Resolve builtin modules correctly (#15683)
• [jest-environment-node, jest-util] Avoid setting globals cleanup protection symbol when feature is off (#15684)

Chore & Maintenance

• [*] Remove and deprecate jest-repl package (#15673)
• [jest-resolver] Replace custom isBuiltinModule with node's isBuiltin (#15685)