node.js - Only the first task run while chaining tasks on package.json -

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i have these scripts part of package.json:

"scripts": {   "clean": "rm -rf lib",   "watch-js": "./node_modules/.bin/babel src -d lib --experimental -w",   "dev-server": "node lib/server/webpack",   "server": "nodemon lib/server/server",   "start": "npm run watch-js & npm run dev-server & npm run server",   "build": "npm run clean && ./node_modules/.bin/babel src -d lib --experimental" }

when running 'npm run start', first task in chain running (npm run watch-js).

when running each 1 of these chained tasks simultaneously work.

also when swapping places between tasks, first task 1 run.

how can make of chained tasks under "start" run?


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