copy-files.ts

import * as fs from 'fs-extra';
import * as path from 'path';
import { bindNodeCallback, concat, Observable, from } from 'rxjs';
import { map } from 'rxjs/operators';

export function globCopy(
  patterns: string[],
  dir: string
): Observable<{patterns: string[], num: number}> {
  return bindNodeCallback(copy)(patterns, dir)
    .pipe(
      map((files) => ({ patterns, num: files.length })
    )
  );
}

const wd = process.cwd();
const filesToCopy = [
  path(wd,'builders.json'),
  path(wd,'collection.json'),
];

const copyAll = globCopy(
  filesToCopy,
  `${wd}/dist`
);
const rename = from(fs.rename(path(${wd},'package.build.json')));

concat(copyAll, rename).subscribe();