I am currently in the process of developing an Electron app with Angular 6, utilizing lowdb as a local database.
This is all very new to me and I am learning through trial and error. However, I seem to be encountering difficulty resolving the following error:
To incorporate lowdb into my application, I executed the commands:
npm install --save lowdb (edit: forgot to mention I did this already)
and
npm install --save @types/lowdb
I have created a service that interfaces with this "local database".
import { Injectable } from '@angular/core';
import lowdb from 'lowdb';
import { default as FileAsync } from 'lowdb/adapters/FileAsync';
import { CurrentUserModel } from '../models/current-user';
@Injectable({
providedIn: 'root'
})
export class LowdbService {
private db: lowdb.LowdbAsync;
constructor() {
this.initDatabase();
}
set( field: string, value: any ) {
this.db.set( field, value ).write();
}
private async initDatabase() {
const adapter = new FileAsync( 'db.json' );
this.db = await lowdb( adapter );
this.db.defaults( { user: CurrentUserModel } );
}
}
However, when I include the service in the constructor of a component, I encounter errors.
ERROR in ./src/app/services/lowdb.service.ts
Module not found: Error: Can't resolve 'lowdb' in '/Users/paul/Projects/application-name/src/app/services'
ERROR in ./src/app/services/lowdb.service.ts
Module not found: Error: Can't resolve 'lowdb/adapters/FileAsync' in '/Users/paul/Projects/application-name/src/app/services'
ℹ ｢wdm｣: Failed to compile.
ERROR in src/app/services/lowdb.service.ts(2,12): error TS1192: Module '"/Users/paul/Projects/application-name/node_modules/@types/lowdb/index"' has no default export.
src/app/services/lowdb.service.ts(3,14): error TS2305: Module '"/Users/paul/Projects/application-name/node_modules/@types/lowdb/adapters/FileAsync"' has no exported member 'default'.
From what I can see, I am following the steps outlined in this Github comment and this Stackoverflow post. Unfortunately, I am unable to locate further documentation on this issue.
Is there anyone who can offer assistance?
Update
By using import * as lowdb from 'lowdb', I was able to resolve my initial errors. However, it led to a few additional errors. See below.
ERROR in ./node_modules/graceful-fs/polyfills.js
Module not found: Error: Can't resolve 'constants' in '/Users/paul/Projects/project-name/node_modules/graceful-fs'
ERROR in ./node_modules/graceful-fs/graceful-fs.js
Module not found: Error: Can't resolve 'fs' in '/Users/paul/Projects/project-name/node_modules/graceful-fs'
ERROR in ./node_modules/graceful-fs/fs.js
Module not found: Error: Can't resolve 'fs' in '/Users/paul/Projects/project-name/node_modules/graceful-fs'
ERROR in ./node_modules/graceful-fs/legacy-streams.js
Module not found: Error: Can't resolve 'stream' in '/Users/paul/Projects/project-name/node_modules/graceful-fs'