Module filter 

Lambda event source mapping filter criteria.

Implements the EventBridge-style JSON pattern subset documented for Lambda ESM FilterCriteria. A record is delivered when any supplied pattern matches; a record is dropped when every pattern fails to match.

Operators implemented (matches AWS’s documented surface):

• exact-string / number / boolean / null match
• {"exists": bool} — field presence
• {"prefix": "..."} / {"suffix": "..."} / {"equals-ignore-case": "..."}
• {"anything-but": value | [values]}
• {"numeric": [op, n, op, n, ...]} with =, <, <=, >, >=
• SQS body decode: when the pattern contains a top-level body key whose value is an object, the SQS message body is parsed as JSON before pattern matching, mirroring AWS behavior.

Structs

FilterSet

Compiled filter set. patterns parses the raw Filters: [{Pattern: "..."}] strings into JSON objects once at create time.