Conclusion

Though content-tag doesn't provide a way to update *.{gjs,gts} files, you can still support these files thanks to @codemod-utils/ast-template-tag.

The best part? You can reuse code.

As exercise, try updating some JavaScript code in *.{gjs,gts,js,ts} files.

import { updateJavaScript } from '@codemod-utils/ast-template-tag';

function transform(file: string): string {
  // ...
}

let file = readFileSync(join(projectRoot, filePath), 'utf8');

file = updateJavaScript(file, transform);

How will you tell transform whether a file uses <template> tag and TypeScript?

Solution

You can instead use parseFilePath from @codemod-utils/files to get the file extension and replace String.endsWith() with ===.

How to pass data

import { updateJavaScript } from '@codemod-utils/ast-template-tag';

type Data = {
  isTemplateTag: boolean;
  isTypeScript: boolean;
};

function transform(file: string, data: Data): string {
  // ...
}

let file = readFileSync(join(projectRoot, filePath), 'utf8');

const data = {
  isTemplateTag: filePath.endsWith('.gjs') || filePath.endsWith('.gts'),
  isTypeScript: filePath.endsWith('.gts') || filePath.endsWith('.ts'),
};

file = updateJavaScript(file, (code) => {
  return transform(code, data);
});