Lerna Monorepos and Travis-CI

Question

I need to setup Travis in a monorepo, I couldn't find resources.

How can I setup the npm deploy for every package?

Answer 1

To setup a lerna repository with travis:

Using:

$ node -v
v10.14.2
$ npm -v
6.4.1

With the structure:

packages/
  foo
    index.js
    package.json
    package-lock.json
  bar
    index.js
    package.json
    package-lock.json
package.json
package-lock.json
lerna.json
.travis.yml

package-lock.json must be included for all packages.

package.json

{
  "name": "my-project-name",
  "scripts": {
    "postinstall": "lerna bootstrap",
    "test": "my-testing-script",
    ...
  },
  "dependencies": {
    "lerna": "^3.7.1",
    ...
  }
}

NPM script postinstall to set up the packages before running script test. Some people install the package globally, but since you already installed it locally, you don't need to.

Since this is the main package.json, you can put all the dependencies in dependencies.

The package.json for the packages can be configured as you need.

lerna.json

{
  "packages": [
    "packages/*"
  ]
}

The file can be configured however you need.

.travis.yml

language: node_js
node_js:
  - "10.14"
script: npm run test

Here you can configure the testing environment the way you need.

In my case, I needed to transpile some files with babel and I used before_script to run this process before the testing script is run.