import * as dt from 'date-utils'

単に上記のような形でimportを行った時に発生します。

エラーの内容から、tsconfig.jsonに問題があるように思えないのですが、何が原因なのでしょうか?

Error:(1, 21) TS2497: This module can only be referenced with ECMAScript imports/exports by turning on the ‘esModuleInterop’ flag and referencing its default export.

以下tsconfig.jsonの内容

{
  "compilerOptions": {
    "moduleResolution": "node",
    "skipLibCheck": false,
    "target": "es5",
    "module": "commonjs",
    "lib": ["es2017", "dom"],
    "experimentalDecorators": true,
    "allowJs": false,
    "jsx": "react",
    "sourceMap": true,
    "strict": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true,
    "removeComments": true,
    "newLine": "LF",
    "downlevelIteration": true,
    "resolveJsonModule": true,
    "allowSyntheticDefaultImports": false
  },
  "exclude": ["node_modules"]
}