add-exports-to-package-json.js

/*
Use this with the following script
```
"write-package-json": "node ./scripts/package-json-writer.js",
"add-exports": "node ./scripts/add-exports-to-package-json.js",
"package:publish": "standard-version && git push --follow-tags origin main && npm run package && 
npm run add-exports　&& npm run write-package-json && npm publish",
```

This script reads the content of a folder named 'dist' and generates an exports object to be included in the 
'package.json' file. The script looks for folders in the 'dist' directory, and for each folder, it checks for 
any '.svelte' files present. For each '.svelte' file found, it generates an object that includes the path 
to the '.d.ts' file and the '.svelte' file. Finally, the script adds the generated exports object to the 
'exports' property of the 'package.json' file.

Example results: The exports object added to the 'exports' property of the 'package.json' file would look 
something like this:

"exports": {
  ".": {
  "types": "./dist/index.d.ts",
  "svelte": "./dist/index.js"
  },
  "./Component1.svelte": {
  "types": "./dist/Component1/Component1.svelte.d.ts",
  "svelte": "./dist/Component1/Component1.svelte"
  },
  "./Component2.svelte": {
  "types": "./dist/Component2/Component2.svelte.d.ts",
  "svelte": "./dist/Component2/Component2.svelte"
  }
}
*/

import fs from 'fs';
import path from 'path';

const distDir = './dist';
const packageJsonPath = './package.json';

const componentNames = fs.readdirSync(distDir);
const componentExports = {};

for (const componentName of componentNames) {
  const componentDir = path.join(distDir, componentName);
  if (!fs.existsSync(componentDir) || !fs.lstatSync(componentDir).isDirectory()) {
    continue;
  }
  const componentFiles = fs.readdirSync(componentDir);

  const svelteFiles = componentFiles.filter((file) => file.endsWith('.svelte'));

  for (const svelteFile of svelteFiles) {
    const dtsFile = `${svelteFile}.d.ts`;
    const exportKey = `./${svelteFile}`;

    componentExports[exportKey] = {
      types: `./dist/${componentName}/${dtsFile}`,
      svelte: `./dist/${componentName}/${svelteFile}`,
    };
  }
}

const indexDtsPath = path.join(distDir, 'index.d.ts');
if (fs.existsSync(indexDtsPath) && fs.lstatSync(indexDtsPath).isFile()) {
  componentExports['.'] = {
    types: './dist/index.d.ts',
    svelte: './dist/index.js',
  };
}

const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf-8'));

packageJson.exports = componentExports;

fs.writeFileSync(packageJsonPath, JSON.stringify(packageJson, null, 2));