REQUIRED_KEYS = {
    "WHEN",
    "STEP_NAME",
    "STEP_STRATEGY",
    "STEP_SETS",
    "STEP_ARGS",
    "STEP_KWARGS",
    "STAGE_NAME",
    "STAGE_TRY",
    "STAGE_EXCEPT",
    "STAGE_ELSE",
    "STAGE_FINALLY",
    "STAGE_WHEN",
    "PIPELINE_ALIASES",
    "PIPELINE_IMPORT",
    "PIPELINE_METADATA",
    "PIPELINE_VALUES",
    "URI_SCHEME_STRATEGY",
    "URI_SCHEME_IMPORT"
}

DEFAULT_MAPPING = """---
WHEN: when
STEP_NAME: name
STEP_STRATEGY: strategy
STEP_SETS: sets
STEP_ARGS: args
STEP_KWARGS: kwargs
STAGE_NAME: name
STAGE_TRY: try
STAGE_EXCEPT: except
STAGE_ELSE: else
STAGE_FINALLY: finally
STAGE_WHEN: when
PIPELINE_ALIASES: aliases
PIPELINE_IMPORT: import
PIPELINE_METADATA: metadata
PIPELINE_VALUES: values
URI_SCHEME_STRATEGY: module
URI_SCHEME_IMPORT: import"""
