'Wait seconds before running next task on scripts package.jscon

What I want to do is when I run npm run dev to execute those both tasks I need to wait for 5 seconds until next task runs.

Run the npm run server wait for 5 seconds and then npm run client

  "scripts": {
    "start": "node ./bin/www",
    "server": "nodemon start",
    "client": "gulp",
    "dev": "concurrently 'npm run server' 'npm run client'", 
}

Solution 1:^[1]

Assuming you're on Linux, you can use sleep command:

"dev": "concurrently 'npm run server' 'sleep 5 && npm run client'"

Solution 2:^[2]

Use Sleep and Background tasks.

Depending on what these tasks do, you might not need concurrently. You might be able to get away with just using & to run one of them as a background task.

The general pattern is as follows:

( sleep 5 && delayed_command ) & immediate_command

So in your case, it would look something like this:

"dev": "( sleep 5 && npm run client ) & npm run server"

If you don't want the output from one of the commands, you can add > /dev/null 2>&1 after the command, like this:

"dev": "( sleep 5 && npm run client > /dev/null 2>&1 ) & npm run server"

Solution 3:^[3]

Adding to @TGrif answer, chain scripts with double ampersand && to execute them sequntially. So to execute sleep command first, put && after it and then write npm run client. So the second command(npm run client) will execute only when the first(sleep) is complete.

Solution 4:^[4]

node -e "setTimeout(()=>{},5000)" && npm run client

Solution 5:^[5]

Cross platform solution for your particular problem, without installing any additional lib. Just invoking a JS script that waits certain time to end.

"scripts": {
  "start": "node ./bin/www",
  "server": "nodemon start",
  "client": "gulp",
  "delayed-client": "node -e \"setTimeout(() => process.exit(0), 5000)\" && npm run client",
  "dev": "concurrently npm:server npm:delayed-client",
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	TGrif
Solution 2
Solution 3	Avantika Saini
Solution 4	Littleboy Harry
Solution 5

'Wait seconds before running next task on scripts package.jscon

Solution 1:[1]

Solution 2:[2]

Use Sleep and Background tasks.

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]