Sequelize-typescript: [Help Wanted] How to define modelPath for transpiled with webpack ts code into single js file?

[someApprentice]

I'm using a webpack to transpile my ts code into js because of some circumstances (for Angular Server Side Rendering) and because webpack transpile all models into single file I can't really define path to it from original file. And I have to define every single model by myself.

// ./api/service/Database.ts
import { Sequelize } from 'sequelize-typescript';

import { join } from 'path';

const sequelize =  new Sequelize({
  //configs
});

sequelize.addModels([join(__dirname, '../models')]);
...

// ./webpack.server.config.js
const path = require('path');
const webpack = require('webpack');
const nodeExternals = require('webpack-node-externals');

module.exports = {
  entry: {  server: './server.ts' },
  resolve: {
    extensions: ['.js', '.ts']
  },
  target: 'node',
  // this makes sure we include node_modules and other 3rd party libraries
  externals: [nodeExternals()],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: '[name].js'
  },
  module: {
    rules: [
      { test: /\.ts$/, loader: 'ts-loader' }
    ]
  },
  plugins: [
    // Temporary Fix for issue: https://github.com/angular/angular/issues/11580
    // for "WARNING Critical dependency: the request of a dependency is an expression"
    new webpack.ContextReplacementPlugin(
      /(.+)?angular(\\|\/)core(.+)?/,
      path.join(__dirname, 'src'), // location of your src
      {} // a map of your routes
    ),
    new webpack.ContextReplacementPlugin(
      /(.+)?express(\\|\/)(.+)?/,
      path.join(__dirname, 'src'),
      {}
    )
  ],
  optimization: {
    // keep minimization off
    // workaround for https://github.com/angular/angular-cli/issues/10635
    minimize: false
  }
}

Expected Behavior

Expected that webpack transpile this line sequelize.addModels([join(__dirname, '../models')]); into something like this sequelize.addModels([Object(path__WEBPACK_IMPORTED_MODULE_1__["join"])(__dirname, './')]); and this transpiled function will add all models which looks like that

let User_User = class User extends external_sequelize_typescript_["Model"] {
};
external_tslib_["__decorate"]([
    Object(external_sequelize_typescript_["IsUUID"])(4),
    Object(external_sequelize_typescript_["Default"])(external_sequelize_typescript_["DataType"].UUIDV4),
    external_sequelize_typescript_["PrimaryKey"],
    Object(external_sequelize_typescript_["Column"])({
        type: external_sequelize_typescript_["DataType"].UUID
    }),
    external_tslib_["__metadata"]("design:type", String)
], User_User.prototype, "uuid", void 0);
external_tslib_["__decorate"]([
    Object(external_sequelize_typescript_["AllowNull"])(false),
    external_sequelize_typescript_["IsEmail"],
    external_sequelize_typescript_["Column"],
    external_tslib_["__metadata"]("design:type", String)
], User_User.prototype, "email", void 0);
external_tslib_["__decorate"]([
    Object(external_sequelize_typescript_["AllowNull"])(false),
    external_sequelize_typescript_["Column"],
    external_tslib_["__metadata"]("design:type", String)
], User_User.prototype, "name", void 0);
external_tslib_["__decorate"]([
    Object(external_sequelize_typescript_["AllowNull"])(false),
    Object(external_sequelize_typescript_["Is"])(/^\$(2[ayb]?)\$([0-9]{1,2})\$([A-Za-z0-9.\/]{53,54})$/) // is bcrypt hash
    ,
    Object(external_sequelize_typescript_["Column"])(external_sequelize_typescript_["DataType"].STRING(60)),
    external_tslib_["__metadata"]("design:type", String)
], User_User.prototype, "hash", void 0);
User_User = external_tslib_["__decorate"]([
    Object(external_sequelize_typescript_["Table"])({ tableName: 'user', modelName: 'user' })
], User_User);

Actual Behavior

Webpack transpile sequelize.addModels([join(__dirname, '../models')]) into sequelize.addModels([Object(path__WEBPACK_IMPORTED_MODULE_1__["join"])(__dirname, './models')]) and when application tries create a model, it throws the error

ERROR: Cannot read property 'createdAt' of undefined
  TypeError: Cannot read property 'createdAt' of undefined
    at User._initValues (/node_modules/sequelize/lib/model.js:3123:49)
    at new Model (/node_modules/sequelize/lib/model.js:3097:10)
    at new Model (/node_modules/sequelize-typescript/lib/models/v4/Model.js:8:9)
    at new User (/dist/server.js:2025:17)
    at /dist/server.js:2140:16
    at Generator.next (<anonymous>)
    at /node_modules/tslib/tslib.js:107:75
    at new ZoneAwarePromise (/node_modules/zone.js/dist/zone-node.js:891:29)
    at Object.__awaiter (/node_modules/tslib/tslib.js:103:16)
    at router.get.asyncHandler (/dist/server.js:2138:90)
    at /dist/server.js:2083:18
    at Layer.handle [as handle_request] (/node_modules/express/lib/router/layer.js:95:5)
    at next (/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/node_modules/express/lib/router/layer.js:95:5)
    at /node_modules/express/lib/router/index.js:281:22
    at param (/node_modules/express/lib/router/index.js:354:14)
    at param (/node_modules/express/lib/router/index.js:365:14)
    at Function.process_params (/node_modules/express/lib/router/index.js:410:3)
    at next (/node_modules/express/lib/router/index.js:275:10)
    at Function.handle (/node_modules/express/lib/router/index.js:174:3)
    at router (/node_modules/express/lib/router/index.js:47:12)

Even set transpiled part of the path to (__dirname, './') manually doesn't actually do anything.

Can anyone advice how to achieve this feature?

[RobinBuschmann]

Hey @someApprentice, I'm not much experienced in webpack. But I think, unless there isn't already a plugin, you need to write your own for that. Or instead of using paths for loading the models, use references like so: sequelize.addModels([YourModelA, YourModelB, ...])

[someApprentice]

@RobinBuschmann Okay, I guess issue can keep open until someone suggest solution or I'm not found it by myself.

[gogoout]

I'm running into the same error. I'm solving it by using require.context. The following code is working for my project.

const REG_CATCH_NAME = /([^\/\.]+)\.tsx?$/;

function getModelNameByPath(path: string) {
    const groups = REG_CATCH_NAME.exec(path);
    if (!groups || groups.length < 2) {
        console.error('Sequelize: Error in parsing model path: ', path);
        return null;
    }
    return groups[1];
}

// webpack require context
// @ts-ignore
const req = require.context('./models', true, /\.tsx?$/);
const models = req
    .keys()
    .map(key => {
        const modelName = getModelNameByPath(key);
        if (modelName) {
            console.log('Sequelize: Load model: ', modelName);
            return req(key)[modelName];
        }
        return null;
    })
    .filter(each => !!each);

sequelize.addModels(models);

[RobinBuschmann]

@someApprentice Can you confirm that @gogoout's solution works?

[RobinBuschmann]

Closing this due to inactivity

[VaguelySerious]

@someApprentice Can you confirm that @gogoout's solution works?

Not OP, but this solution worked for me, with a slight change.

Since I'm exporting my modules as default export, I need to change the line
return req(key)[modelName];
to
return req(key).default;