'What is Laravel Sail's HMR_PORT in Docker

I'm learning docker, trying to build an environment: Two Laravel Sail project, with Nginx Proxy Manager.

This is the video I'm watching. I labeled the time: https://www.youtube.com/watch?v=N3uVU7To2Bc&t=192s To quickly understanding my problem, not necessary to watch it.

.env in Project1:

APP_PORT=48080
FORWARD_DB_PORT=43306
FORWARD_REDIS_PORT=46379
FORWARD_MEILISEARCH_PORT=47700
FORWARD_MAILHOG_PORT=41025
FORWARD_MAILHOG_DASHBOARD_PORT=48025

.env in Project2:

APP_PORT=58080
FORWARD_DB_PORT=53306
FORWARD_REDIS_PORT=56379
FORWARD_MEILISEARCH_PORT=57700
FORWARD_MAILHOG_PORT=51025
FORWARD_MAILHOG_DASHBOARD_PORT=58025

When I do sail up -d for project 2, it keeps saying that 8080 is allocated!! WHO USES 8080 ??? Then I found the place: project1/docker-compose.yml
project2/docker-compose.yml

ports:
    - '${APP_PORT:-80}:80'
    - '${HMR_PORT:-8080}:8080'

What is HMR_PORT? I did some googling, but not quite understanding. Does it something to do with vue? What's it used for? Can I delete the line?

laravel docker

Solution 1:^[1]

I wondered the same thing. I think it is for Hot Module Replacement https://github.com/laravel-mix/laravel-mix/blob/master/docs/hot-module-replacement.md

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Source: Stack Overflow

Solution	Source
Solution 1	Rich Standbrook

'What is Laravel Sail's HMR_PORT in Docker

Solution 1:[1]

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Related Questions

Solution 1:^[1]