Module loader 

YAML loading with shell-style environment variable interpolation, applied to the raw file text before deserialization so every config value — including nested plugin config — supports ${ENV_VAR:-default}.

Functions

interpolate_env

Replaces ${VAR} and ${VAR:-default} patterns with environment variable values.

interpolate_env_json

Recursively interpolates ${ENV_VAR:-default} patterns in every string leaf of a JSON value — object values, array elements, and nested combinations — leaving numbers, booleans, and null untouched.

load_yaml_with_env

Loads a YAML file, interpolates environment variables, and deserializes into T.