opencode/script/ast-grep/effect-simplifications/rules/no-effect-catch-fail.yml

id: no-effect-catch-fail
language: TypeScript
message: Use mapError instead of catching only to fail with a transformed error.
severity: error
rule:
  all:
    - pattern: $MODULE.catch($$$ARGS)
    - any:
        - pattern: Effect.catch($$$SELF, ($ERROR) => Effect.fail($MAPPED))
        - pattern: Effect.catch($$$SELF, $ERROR => Effect.fail($MAPPED))
        - pattern: Effect.catch($$$SELF, ($ERROR) => { return Effect.fail($MAPPED) })
        - pattern: Effect.catch($$$SELF, $ERROR => { return Effect.fail($MAPPED) })
        - pattern: "Effect.catch($$$SELF, ($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE> => Effect.fail($MAPPED))"
        - pattern: "Effect.catch($$$SELF, ($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE> => { return Effect.fail($MAPPED) })"
        - pattern: "Effect.catch($$$SELF, ($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => Effect.fail($MAPPED))"
        - pattern: "Effect.catch($$$SELF, ($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => { return Effect.fail($MAPPED) })"
        - pattern: Stream.catch($$$SELF, ($ERROR) => Stream.fail($MAPPED))
        - pattern: Stream.catch($$$SELF, $ERROR => Stream.fail($MAPPED))
        - pattern: Stream.catch($$$SELF, ($ERROR) => { return Stream.fail($MAPPED) })
        - pattern: Stream.catch($$$SELF, $ERROR => { return Stream.fail($MAPPED) })
        - pattern: "Stream.catch($$$SELF, ($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE> => Stream.fail($MAPPED))"
        - pattern: "Stream.catch($$$SELF, ($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE> => { return Stream.fail($MAPPED) })"
        - pattern: "Stream.catch($$$SELF, ($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => Stream.fail($MAPPED))"
        - pattern: "Stream.catch($$$SELF, ($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => { return Stream.fail($MAPPED) })"
    - not:
        pattern: $MODULE.catch($_FIRST, $_SECOND, $$$REST)
constraints:
  MAPPED:
    not:
      any:
        - kind: identifier
        - kind: parenthesized_expression
rewriters:
  - id: unwrap-effect-fail-with-return-type
    rule:
      any:
        - pattern: "($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE> => Effect.fail($MAPPED)"
        - pattern: "($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE> => { return Effect.fail($MAPPED) }"
        - pattern: "($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => Effect.fail($MAPPED)"
        - pattern: "($ERROR): Effect.Effect<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => { return Effect.fail($MAPPED) }"
    fix: "($ERROR): $ERROR_TYPE => $MAPPED"
  - id: unwrap-stream-fail-with-return-type
    rule:
      any:
        - pattern: "($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE> => Stream.fail($MAPPED)"
        - pattern: "($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE> => { return Stream.fail($MAPPED) }"
        - pattern: "($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => Stream.fail($MAPPED)"
        - pattern: "($ERROR): Stream.Stream<$_SUCCESS, $ERROR_TYPE, $_REQUIREMENTS> => { return Stream.fail($MAPPED) }"
    fix: "($ERROR): $ERROR_TYPE => $MAPPED"
  - id: unwrap-effect-fail
    rule:
      any:
        - pattern: ($ERROR) => Effect.fail($MAPPED)
        - pattern: $ERROR => Effect.fail($MAPPED)
        - pattern: ($ERROR) => { return Effect.fail($MAPPED) }
        - pattern: $ERROR => { return Effect.fail($MAPPED) }
    fix: ($ERROR) => $MAPPED
  - id: unwrap-stream-fail
    rule:
      any:
        - pattern: ($ERROR) => Stream.fail($MAPPED)
        - pattern: $ERROR => Stream.fail($MAPPED)
        - pattern: ($ERROR) => { return Stream.fail($MAPPED) }
        - pattern: $ERROR => { return Stream.fail($MAPPED) }
    fix: ($ERROR) => $MAPPED
transform:
  MAPPED_ARGS:
    rewrite:
      rewriters:
        - unwrap-effect-fail-with-return-type
        - unwrap-stream-fail-with-return-type
        - unwrap-effect-fail
        - unwrap-stream-fail
      source: $$$ARGS
fix: $MODULE.mapError($MAPPED_ARGS)