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nextflow/docs/developer/nextflow.config.md

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+
+# `nextflow.config`
+
+The `nextflow.config` package contains the implementation of the Nextflow configuration.
+
+## Class Diagram
+
+```{mermaid} diagrams/nextflow.config.mmd
+```
+
+```{note}
+Some classes may be excluded from the above diagram for brevity.
+```
+
+## Notes
+
+Any command that parses Nextflow config files (`config`, `run`, etc) uses the `ConfigBuilder` to build a `ConfigMap` from a set of config files. The `ConfigBuilder` itself uses a `ConfigParser` to parse the config files.
+
+The Nextflow configuration language is essentially Groovy with some extensions. These extensions are implemented in `ConfigBase` and `ConfigTransformImpl`.