Output file matches when defining a task

[ODiogoSilva]

I noticed that when defining a task:

// this is a kiss example of how tasks work with shell
const simpleTask = task({
  output: '*.txt', // checks if output file matches the specified pattern
  params: 'test_file.txt',  //defines parameters to be passed to the
    // task function
  name: 'This is the task name' //defines the name of the task
}, function(resolvedProps) {
    const params = resolvedProps.params
    return 'touch ' + params
  }
)

It seems that only one output file can be matched for a given extension?

output: '*.txt', // checks if output file matches the specified pattern

Is there a way to match multiple files of the same extension?

[tiagofilipe12]

In its current state watermill crawls the DAG (or simply tree of tasks) and searches for the first match for that pattern. So if you have something like:

Task1 output --> *.txt
Task2 output --> *.txt
Task3 input --> *.txt

and your pipeline is something like join(Task1, Task2, Task3)

Task3 input will match Task2 output *.txt.

Although it can take multiple output patterns such as defined here:

output: ['1.txt', '2.txt'].map(suffix => `*.${suffix}`),

Same way it can take several inputs:

input: ['1.txt', '2.txt'].map(suffix => `*.${suffix}`),

This is something worth mentioning here.