how to use result from another task?

[whatwg6]

Has folder structer, want to analyse witch less file was used in tooltip/index.tsx and complier.

├─components
|     ├─tooltip
|     |    ├─index.less // want to complier this file only
|     |    ├─index1.less
|     |    ├─index.tsx

// tooltip/index.tsx
import styles from "./index.less"

Code implement

const { Buffer } = require('buffer');
const { src, dest, series } = require('gulp');

const through2 = require('through2');
const path = require('path');
const less = require('gulp-less');
const postcss = require('gulp-postcss');

// match import styles from "./index.less"
const regImport = /(import)\s+(\w+)\s+(from)\s+(['"][.|@|/|\w]*\w+.less['"])/g;
const getMatchsCSS = (str) =>
  [].concat(str.match(regImport)).filter(Boolean);

let collect = [] // ['user/xxx/components/tooltip/index.less']
const analyseLessUsedInJS = (c) => {
  src('./dist/es/**/*.{js,jsx,ts,tsx}')
    .pipe(
      through2.obj((chunk, _, c) => {
        arr = arr.concat(
          getMatchsCSS(chunk.contents.toString()).map((str) =>
            path.join(
              path.dirname(chunk.path),
              str.match(/[.|@|/|\w]*\w+.less/g).join('')
            )
          )
        );
        c(null, chunk);
      })
    )
  c();
};

const complierCSSModule = (c) => {
 console.log(collect) //  problems: collect always []
  src(collect) 
    .pipe(less())
    .pipe(postcss([require('postcss-modules')]))
    .pipe(dest('dist/es'));

  c();
};

exports.default = series(analyseLessUsedInJS, complierCSSModule);

[whatwg6]

if collect is not empty, Is this good practice? Is there another way to implement it