lacelang-validator (TypeScript)

Reference TypeScript validator for Lace -- parser and semantic checks with 100% spec conformance (v0.9.1). Zero runtime dependencies.

Parsing and semantic validation only -- no HTTP runtime, no network dependencies. See @lacelang/executor for the execution runtime. See lace-spec.md section 15 for the validator / executor package separation rule.

Install

npm install @lacelang/validator

Or from source:

npm install git+https://github.com/tracedown/lacelang-js-validator.git

CLI

# Parse -- check syntax, emit AST
lacelang-validate parse script.lace

# Validate -- check syntax + semantic rules
lacelang-validate validate script.lace --vars-list vars.json --context context.json

Both subcommands support --pretty for indented JSON.

Library

import { parse, validate, fmt } from "@lacelang/validator";

// Parse a .lace script to AST
const ast = parse('get("https://example.com").expect(status: 200)');

// Validate the AST
const sink = validate(ast, ["base_url"], { maxRedirects: 10, maxTimeoutMs: 300000 });
console.log(sink.errors);   // Diagnostic[]
console.log(sink.warnings); // Diagnostic[]

// Format an AST expression back to source text
const expr = ast.calls[0].chain.expect.status.value;
console.log(fmt(expr)); // "200"

Responsible use

This software is designed for monitoring endpoints you own or have explicit authorization to probe. See NOTICE for the full statement.

License

Apache License 2.0