Can an ES6 class be utilized as a custom TypeScript type?

My goal is to accomplish the following:

  • Developing a Typescript class and exporting it in a .ts file.
  • Compiling that .ts file into an ES6 .js bundled file.
  • Importing the class from the bundled .js file in a new .ts file elsewhere.
  • Utilizing this imported class from the bundled file as a type.

Is this feasible? If so, what steps should I take to make it happen?

Answer №1

Within your tsconfig.json configuration file, you have the ability to establish a compiler option labeled declaration and set it to true. This setting ensures that when you compile your TypeScript files into JavaScript, the necessary definition files (.d.ts) are automatically generated. These definition files can then be imported within your TypeScript/JavaScript project using type assertion.

To illustrate: Take a look at the tsconfig.json file from my project:

{
  "compilerOptions": {
    "module": "commonjs",
    "esModuleInterop": true,
    "target": "es5",
    "experimentalDecorators": true,
    "strict": true,
    "moduleResolution": "node",
    "sourceMap": true,
    "noUnusedLocals":  true,
    "incremental": true,
    "outDir": "dist",
    "tsBuildInfoFile": "dist/.tsBuildInfoFile",
    "baseUrl": ".",
    "resolveJsonModule": true,
    "declaration": true,
    "typeRoots": ["./src/types", "./node_modules/@types"]
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "test/**/*"]
}

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