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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

The parameter decorators

The official decorators proposal defines a parameter decorator as follows:

"A parameter decorator function is a function that accepts three arguments: The object that owns the method that contains the decorated parameter, the property key of the property (or undefined for a parameter of the constructor), and the ordinal index of the parameter. The return value of this decorator is ignored".
                                                                  - Ron Buckton, Decorators Proposal - TypeScript

The following type declares the signature of a parameter decorator:

declare type ParameterDecorator = (target: Object, propertyKey: string | symbol, parameterIndex: number) => void; 
Please note that this signature ...
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Publisher Resources

ISBN: 9781788391474Supplemental Content