_project.txt

~$ tree -L 1
.
├── cubism-js
├── dist
├── node_modules
├── package-lock.json
├── package.json
├── src
    └── tsc
        └── main.ts   
├── tsconfig.json
└── webpack.config.js 

~$ npm run build
> [email protected] build /home/ioijoi/program/juniQ
> webpack

Hash: 8ddd79ba29a55ef0b4f9
Version: webpack 4.15.1
Time: 2363ms
Built at: 2018-07-07 01:24:47
      Asset      Size  Chunks             Chunk Names
    main.js  1.37 MiB    main  [emitted]  main
main.js.map  1.55 MiB    main  [emitted]  main
[./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 489 bytes {main} [built]
[./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {main} [built]
[./src/tsc/main.ts] 515 bytes {main} [built] [1 error]
    + 189 hidden modules

ERROR in ./src/tsc/main.ts
Module not found: Error: Can't resolve '../../cubism-js/src/live2dcubismcore' in '/home/ioijoi/program/juniQ/src/tsc'
 @ ./src/tsc/main.ts 5:23-70

ERROR in /home/ioijoi/program/juniQ/src/tsc/main.ts
./src/tsc/main.ts
[tsl] ERROR in /home/ioijoi/program/juniQ/src/tsc/main.ts(2,35)
      TS2306: File '/home/ioijoi/program/juniQ/cubism-js/src/live2dcubismcore.d.ts' is not a module.
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! [email protected] build: `webpack`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the [email protected] build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/ioijoi/.npm/_logs/2018-07-07T08_24_47_111Z-debug.log

main.ts

import * as PIXI from 'pixi.js';
import * as LIVE2DCUBISMCORE from '../../cubism-js/src/live2dcubismcore';
// ここの時点でvscodeが
// [ts] File '../../cubism-js/src/live2dcubismcore' is not a module
// って怒ってくる

package.json

{
  "name": "juniq",
  "version": "1.0.0",
  "description": "",
  "main": "./src/tsc/main.ts",
  "scripts": {
    "build": "webpack"
  },
  "author": "",
  "license": "MIT",
  "devDependencies": {
    "@types/pixi.js": "^4.8.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-env": "^1.7.0",
    "pixi.js": "^4.8.1",
    "ts-loader": "^4.4.2",
    "typescript": "^2.9.2",
    "webpack": "^4.15.1",
    "webpack-cli": "^3.0.8"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "sourceMap": false,
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "classic",
    "lib": [ "es2015", "dom" ],
    "baseUrl": ".",
    "paths": {
      "*": [
        "src/tsc/*",
        "node_modules/*",
        "./cubism-js/src/live2dcubismcore.d.ts"
      ]
    }
  }
}

webpack.config.js

var path = require('path');

module.exports = {
  mode: 'development',
  entry: './src/tsc/main.ts',
  devtool: 'source-map',
  
  module: {
    rules: [
      {
        exclude: /node_modules/,
        test: /\.ts$/,
        use: [
          {
            loader: 'babel-loader',
            options: { presets: ["env"] }
          },
          {
            loader: 'ts-loader',
          }
        ]
      },
    ],
  },

  resolve: {
    modules: [ 'src', 'node_modules' ],
    extensions: [ '.ts', '.js' ]
  },
};