TypeTags .Error

Overview#

Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types.

• AggregateError Creates an instance representing several errors wrapped in a single error when multiple errors need to be reported by an operation, for example by Promise.any().

• EvalError Creates an instance representing an error that occurs regarding the global function eval().

• RangeError Creates an instance representing an error that occurs when a numeric variable or parameter is outside of its valid range.

• ReferenceError Creates an instance representing an error that occurs when de-referencing an invalid reference.

• SyntaxError Creates an instance representing a syntax error.

• TypeError Creates an instance representing an error that occurs when a variable or parameter is not of a valid type.

• URIError Creates an instance representing an error that occurs when encodeURI() or decodeURI() are passed invalid parameters.

Usage#

import { TypeTags } from 'typetags'

try {
  throw new Error('Whoops!')
} catch (e) {
  console.error(e.name + ': ' + e.message)
}

TypeTags.get(new Error('Bam!'))
// → [object Error]

Predicate#

TypeTags.isError(value)#

• Checks if value is or has a default Error type tag.

const { TypeTags } = require('typetags')

let error = new Error('Bam!')

TypeTags.isError(error.toString())
// → false

TypeTags.isError(error)
// → true

Metadata (TType)#

Signature#

declare type ITypeTags = {
  [key in Types | NestedTypes]: Tags
}

declare interface Predicate {
  predicate(value: any): boolean
}

See MDN Web Docs#