You cannot use ca.select(....).from function after the code has been minified

My Angular application utilizes squel.js and functions correctly in development mode.

However, upon building the app for production and attempting to use it, I encounter the following error message:

ca.select(...).from is not a function

This error refers to the following code snippet in the unminified version:

import * as squel from 'squel';

// ...

squel.select().from(...)

Answer №1

The root of the problem lies in an issue with squel.js that hinders its functionality after it has been minified.

Solution (Workaround)

1) To address this issue, you can include sqlite as a script in your angular.json file instead of using the import method. Simply add it to the scripts array under

projects.myAppName.architect.build.options
:

"scripts": [
  "node_modules/squel/dist/squel.min.js"
]

Make sure to also add it to

projects.myAppName.architect.test.options
to ensure the unit tests run smoothly.


2) Although the production bundle is now functioning properly, we must fix the typings to ensure compatibility with the TypeScript compiler.

Since the import:

import * as squel from 'squel';

Has been removed, all types such as squel.Insert will be incompatible.

To resolve this, add:

declare const squel: Squel & {flavour: null};

Now, the typings like squel.Insert, squel.Delete, etc., will be replaced by simply Insert, Delete, and so on. Don't forget to import them:

import { Squel, Delete, Insert } from 'squel';

This approach allows you to use import solely for importing type definitions rather than the entire library.

Example

https://github.com/azerothcore/Keira3/commit/98f191eb59cf9c853dd8a54a845a029c7a4ddef8

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