Webpack5 + TypeScript + Babel(core-js)でCan't resolveエラーが出た場合の対処法

環境

"@babel/cli": "^7.12.10",
"@babel/core": "^7.12.10",
"@babel/preset-env": "^7.12.11",
"@babel/preset-typescript": "^7.12.7",
"babel-loader": "^8.2.2",
"ts-loader": "^8.0.14",
"typescript": "^4.1.3",
"webpack": "^5.14.0"
"core-js": "^3.8.2"

概要

WebpackとBabelでpolyfilをいい感じに使おうとしたら以下のエラーが延々と…

ERROR in ./node_modules/core-js/modules/es.array.for-each.js 2:8-38
Module not found: Error: Can't resolve '../internals/export' in '/Users/s01212/workspace/glasgow-dpa-sdk/node_modules/core-js/modules'
 @ ./src/scripts/Params.ts 1:0-46
 @ ./src/scripts/AmebaDpa.ts 1:0-34 25:4-15 27:8-24 30:6-23
 @ ./src/scripts/index.ts 1:0-38 10:26-34

ERROR in ./node_modules/core-js/modules/es.array.for-each.js 3:14-52
Module not found: Error: Can't resolve '../internals/array-for-each' in '/Users/s01212/workspace/glasgow-dpa-sdk/node_modules/core-js/modules'
 @ ./src/scripts/Params.ts 1:0-46
 @ ./src/scripts/AmebaDpa.ts 1:0-34 25:4-15 27:8-24 30:6-23
 @ ./src/scripts/index.ts 1:0-38 10:26-34

ERROR in ./node_modules/core-js/modules/es.array.iterator.js 2:22-63
Module not found: Error: Can't resolve '../internals/to-indexed-object' in '/Users/s01212/workspace/glasgow-dpa-sdk/node_modules/core-js/modules'
 @ ./src/scripts/Params.ts 2:0-46
 @ ./src/scripts/AmebaDpa.ts 1:0-34 25:4-15 27:8-24 30:6-23
 @ ./src/scripts/index.ts 1:0-38 10:26-34

✨解決

webpack.config.js

  resolve: {
    extensions: [
      '.ts'
    ]
  }

上記に '.js' を追加することで解消！