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Edit: I think the site ate my first answer

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --recv-key --keyserver keyserver.ubuntu.com 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --recv-key --keyserver keyserver.ubuntu.com 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --recv-key --keyserver keyserver.ubuntu.com 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --recv-key --keyserver keyserver.ubuntu.com --recv-key 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

# my_catkin_project/package.xml
...
  <depend>nodejs</depend>
...

# my_catkin_project/CMakeLists.txt
...
catkin_project(my_catkin_project DEPENDS nodejs)
...

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --keyserver keyserver.ubuntu.com --recv-key 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

Update: I was mistaken. Not only is nodejs packaged for most recent Ubuntu releases, it's also been a rosdep package since at least 2014: https://github.com/ros/rosdistro/commit/58e3227d9

So, what you have to do is a lot smaller; i.e.,

# my_catkin_project/package.xml
...
  <depend>nodejs</depend>
...

# my_catkin_project/CMakeLists.txt
...
catkin_project(my_catkin_project DEPENDS nodejs)
...

Original answer follows.

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --keyserver keyserver.ubuntu.com --recv-key 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).

Update: I was mistaken. Not only is nodejs packaged for most recent Ubuntu releases, it's also been a rosdep package since at least 2014: https://github.com/ros/rosdistro/commit/58e3227d9

So, what you have to do is a lot smaller; i.e.,

# my_catkin_project/package.xml
...
  <depend>nodejs</depend>
...

# my_catkin_project/CMakeLists.txt
...
catkin_project(my_catkin_project catkin_package(my_catkin_project DEPENDS nodejs)
...

Original answer follows.

Buckle up --- this is a multi-step process.

First, tell apt where to find the node stuff. Follow their instructions, or, if you're feeling fancy...

Get their pubkey:

root@mybionic:~# apt-key adv --keyserver keyserver.ubuntu.com --recv-key 9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280

Point your apt to their repository:

# /etc/apt/sources.list.d/nodejs.list
deb     https://deb.nodesource.com/node_10.x bionic main
deb-src https://deb.nodesource.com/node_10.x bionic main

And update your apt cache:cache:keycode 64 = Alt_L NoSymbol Alt_L keycode 92 = Alt_R NoSymbol Alt_R keycode 108 = Alt_R NoSymbol Alt_R

root@mybionic:~# apt update

Next, you have to convince rosdep (read "lie") that there is a ROS package called nodejs which, for each and every ROS-supported Operating System, is called nodejs. This fakery requires two files, one "rosdep yaml" file to provide the aforementioned associations...

# /var/lib/rosdep/nodejs.yaml
nodejs:
  arch: [nodejs]
  cygwin: [nodejs]
  debian: [nodejs]
  fedora: [nodejs]
  freebsd: [nodejs]
  gentoo: [nodejs]
  opensuse: [nodejs]
  osx: [nodejs]
  rhel: [nodejs]
  ubuntu: [nodejs]

...and one "rosdep list" file to tell rosdistro about the yaml file:

# /etc/ros/rosdep/sources.list.d/nodejs.list
yaml file:///var/lib/rosdep/nodejs.yaml

Note that the rosdep yaml can live anywhere you want, but, given that this is stateful file whose contents affect the entire ROS installation, it makes sense to put it somewhere only root can touch it. Note also that, since bloom v0.8.0, it's not enough to configure for a proper subset of supported platforms --- you have to configure for all of them.

After emplacing the rosdep yaml and rosdep list, you can rosdep update. Now, when rosdep sees...

# my_catkin_project/package.xml
...
    <depend>nodejs</depend>
...

...it will delegate to apt the installation of the package (if it's not already installed).