CI and Mega-Linter as QA tool - PHPCS

[llaville]

Mega-Linter v4 was added in the CI as QA tool to avoid technical debt since v3.10 (2021-08-28)

Even if this repository is huge, I try to improve each days the CI.

Today I would like to talk about one of the cool feature of Mega-Linter linter.cli_lint_mode and ability to override it at runtime by configuration !

Mega-Linter use file mode by default that means it's calls the linter for each file to scan.
This introduces a performance problem.

For example, with this repository, the first following screenshot represent file mode

And the next one represent result after switching to project mode (PHP_PHPCS_CLI_LINT_MODE: project)

Look at the phpcs highlighted line in summary table and compare the elapsed time.

I suggest as strategy to use always first (as possible : depending of linter) the project mode that is much more performant.