@open-formulieren/infernologic
v0.2.0
Published
InferNoLogic is the TypeScript library designed to cool down the hellfire of type mismatches in JsonLogic. Navigate through your complex logic rules with the confidence that your types align.
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InferNoLogic
Type checker for JsonLogic expressions with full type inference
Design goal
Infer the result types of JsonLogic expressions and possibly of data referenced in {"var": ...}
expressions.
- without the need of extra annotations; full inference without extra JsonLogic syntax
- fast; should run in a browser while editing
- soundness over completeness; prefer false negatives over false positives. For example: in
{"if": [predicate-expression, then-expression, else-expression]}require then- and else-expressions of the same type, even though JsonLogic allows them to differing ones. - actionable error messages; No "Computer says no" but a location in the expression tree with as narrow a scope as possible, with some helpful humane hint. (Aim for Elm and Rust compiler helpfulness)
Usage
Install with npm or yarn:
npm install --save-dev @open-formulieren/infernologic
yarn add -D @open-formulieren/infernologicReferences
Builds on implementations from domdomegg/hindley-milner-typescript-minimal for
Algorithm W
Damas, L. and Milner, R. (1982). Principal type-schemes for functional programs. Proceedings of the 9th ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages - POPL '82. https://doi.org/10.1145/582153.582176
Algorithm M
Lee, O. and Yi, K. (1998). Proofs about a folklore let-polymorphic type inference algorithm. ACM Transactions on Programming Languages and Systems, 20(4), 707-723. https://doi.org/10.1145/291891.291892