angular - Importing aws4 into an Angular2 app -


i trying use aws4 package sign requests in angular2 typescript2 app. have installed package , in node_modules.

in component.ts file, try import with:

import * aws4 'aws4';

when build project webpack, code complains cannot find module 'aws4'. however, in same directory if start node , run require('aws4') works, module there , has been installed.

@types/aws4 not available.

the interesting thing though typescript complains can't find aws4 seems still imported anyway. however, different error in browser: querystring.escape not function. think webpack build code such nodejs dependencies such querystring pollyfilled.

is there need add typescript code or webpack use aws4?

i can typing problem not shimming built-in node module problem:

the ts compiler doesn't know shape of aws4 module must supply it. say, module doesn't have typings available through npm means need create typings it. minimum need file named "aws4.d.ts" 1 line:

declare module "aws4";

import typing in "component.ts" /// <reference path="path/to/aws4.d.ts" />. if put typing in same directory "component.ts" can skip reference bit.

this minimal typing placates compiler though didn't tell ts true shape of library.

note: because ts compiler can't find dependency doesn't mean won't emit import statement code. that's why page still loads aws4 later fails on referencing querystring.escape.


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