Inject imports into another file and export array of routes for gulp

import_script.ts

#!/bin/node

const through = require('through2');
const ARRAY_REGEX = new RegExp(/(\[).*([\s\t\n]?.*)+(\])/g);
const IMPORT_REGEX = new RegExp(/import.+([\'|\"])/g);
const OBJECT_REGEX = new RegExp(/(\{).*([\s\t\n]?.*)+(\})/gi);

function concatArray(arr: string[], items: string[]): string[] {
    return arr.concat(items);
}

function getStringObjectFromArray(str: string) {
    return str.match(OBJECT_REGEX)[0];
}

var injector = () => {
    let firstFile: any;
    let routesFile: string[] = [];
    let importsFile: string[] = [];

    return through.obj(function (file: any, enc: any, done: any) {
        if (file.isNull()) {
            this.push(file);

            return done();
        }

        if (file.isStream()) {
            this.push(file);

            return done();
        }

        let contents = file.contents.toString();
        let arrays = contents.match(ARRAY_REGEX);
        let imports = contents.match(IMPORT_REGEX);

        if (imports) {
            importsFile = concatArray(importsFile, imports);
        }

        if (arrays) {
            routesFile.push(getStringObjectFromArray(arrays[0]));
        }

        if (!firstFile) {
            firstFile = file;

            return done();
        }

        //iterate(firstFile, file, done);

        this.push(file);

        return done();
    }, function sendBack(cb: any) {
        importsFile = importsFile
            .map((x:string) => x.replace('./', '../'));
        let content = importsFile.join("\n");
        let routes = "\n\nexport default [" + routesFile.join(",\n") + "]";
        content += routes;
        firstFile.contents = new Buffer(content);
        this.push(firstFile);
        cb();
    });
};

export default injector;

Example:

base.js

import Hello from './components/Hello.vue'

export default [{
    path: '/vue/home',
    name: 'home',
    component: Hello
  }
]

another.js

import Another from './clients/developer/components/Another.vue'

export default [
  {
    path: '/vue/developer',
    name: 'developer',
    component: Adios
  }
]

Will generate:

import Hello from '../components/Hello.vue'
import Another from './clients/developer/components/Another.vue'

export default [{
    path: '/vue/home',
    name: 'home',
    component: Hello
  },
{
    path: '/vue/developer',
    name: 'developer',
    component: Adios
  }]