What's the meaning of tilde in Github Action workflow listened events

Question

I found the following GitHub Actions workflow in a repository

name: Test workflow
on:
  push: ~
  pull_request:
    branches: [ dev, main ]
jobs:
  ...

I know ~ means null in YAML world, but it can represent "default value" depending on where it is used.

In GitHub Action context, what does the tilde (~) on the push event line means ? It looks like it does nothing.

Does this answer your question? [What is the purpose of tilde character ~ in YAML?](https://stackoverflow.com/questions/51990175/what-is-the-purpose-of-tilde-character-in-yaml) — Nico Haase, Apr 17 '23 at 08:26
Your Github link carries an identifier for the French language. — Andreas is moving to Codidact, Apr 17 '23 at 08:34

score 1 · Answer 1 · answered Apr 17 '23 at 08:34

The normal syntax for on: would be:

  on: push

Here, you need a sequence below on:, because push is not the only criteria.
However, push: itself does not need (in this instance) any more argument/sequence.
Hence, the ~ (empty sequence) used as a value.

It should be the same as

  on:
    push

What's the meaning of tilde in Github Action workflow listened events

1 Answers1