Is bitbucket-pipelines.yml triggered only in specific branch?

[alstaroverov]

can bitbucket-pipelines.yml be in any branch? Suppose I have a repo with multiple branches ( master, develop, feature_cool_feature_1, etc.) and have bitbucket-pipelines.yml in every, contains:

pipelines:
default:
- step:
{unittests running}

Will they work altogether when merge any branch? Or only 1 bitbucket-pipelines.yml will work according to branch where code is merged?

[Justin Thomas]

@alstaroverov The Bitbucket Pipelines definition is based on the branch that has changed. 

For example: If I push a commit to the development branch, then bitbucket-pipelines.yml from the development branch is used as the Bitbucket Pipelines definition. Please let me know if you have further questions.