Package Exports

@polkadot/util
@polkadot/util/array/filter
@polkadot/util/assert
@polkadot/util/bn/toBn
@polkadot/util/bn/toHex
@polkadot/util/bn/toU8a
@polkadot/util/buffer/toU8a
@polkadot/util/compact/defaults
@polkadot/util/ext/error
@polkadot/util/hex
@polkadot/util/hex/addPrefix
@polkadot/util/hex/fixLength
@polkadot/util/hex/hasPrefix
@polkadot/util/hex/stripPrefix
@polkadot/util/hex/toBn
@polkadot/util/hex/toU8a
@polkadot/util/index
@polkadot/util/is
@polkadot/util/is/bn
@polkadot/util/is/boolean
@polkadot/util/is/buffer
@polkadot/util/is/error
@polkadot/util/is/function
@polkadot/util/is/hex
@polkadot/util/is/instanceOf
@polkadot/util/is/ip
@polkadot/util/is/null
@polkadot/util/is/number
@polkadot/util/is/object
@polkadot/util/is/observable
@polkadot/util/is/string
@polkadot/util/is/u8a
@polkadot/util/is/undefined
@polkadot/util/logger
@polkadot/util/number/toHex
@polkadot/util/number/toU8a
@polkadot/util/polyfill
@polkadot/util/promisify
@polkadot/util/string
@polkadot/util/string/shorten
@polkadot/util/string/toU8a
@polkadot/util/syncify
@polkadot/util/u8a
@polkadot/util/u8a/concat
@polkadot/util/u8a/fixLength
@polkadot/util/u8a/toBn
@polkadot/util/u8a/toBuffer
@polkadot/util/u8a/toHex
@polkadot/util/u8a/toString
@polkadot/util/u8a/toU8a

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@polkadot/util) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@polkadot/util

Various useful utility functions that are used across all projects in the @polkadot namespace. It provides utility functions with additional safety checks, allowing not only for consistent coding, but also reducing the general boilerplate.

Usage

Installation -

yarn add @polkadot/util

Functions can be imported directly from the package, e.g.

import { isHex } from '@polkadot/util';

Documentation and Available Utilities

Below is a list of currently exposed methods published at the Polkadot-JS Common Documentation Portal.

Utility methods for this package are split into groups, some of which are included in the list below:

util
- Classes
  - Error
- Functions
  - arrayFilter
  - assert
  - logger
  - promisify
  - syncify

Below is information about some of the available methods:

Assert

Checks for a valid test, if not ExtError is thrown

Logger

Creates a consistent log interface for messages that has .log, .error, .warn and .debug (controlled with environment DEBUG=typeA,typeB) methods.

Promisify

Wraps a supplied asynchronous callback function into a Promise, passing supplied parameters. When error is set, the Promise is rejected, else the Promise resolves with the result value.

Syncify

This is currently for Node environments only.