diff --git a/.github/workflows/commit_gate.yml b/.github/workflows/commit_gate.yml
new file mode 100644
index 0000000..392c028
--- /dev/null
+++ b/.github/workflows/commit_gate.yml
@@ -0,0 +1,33 @@
+name: Commit Gate
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v3
+    
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '20'  # Or any other version you need
+
+    - name: Install dependencies
+      run: npm ci --prefix src/
+
+    - name: Build
+      run: npm run build --prefix src/
+      
+    - name: Install test dependencies
+      run: npm ci --prefix tests/
+
+    - name: Run tests
+      run: npm run test --prefix tests/
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..a6661d4
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,45 @@
+name: Publish npm package
+
+on:
+  push:
+    tags: v*
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+    - name: Get version from tag
+      id: get_version
+      # "refs/tags/v" is 11 characters
+      run: |
+        versionNumber=${GITHUB_REF:11}
+        echo "::set-output name=version_number::$versionNumber"
+        
+    - name: checkout code
+      uses: actions/checkout@v3
+    
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+        registry-url: 'https://registry.npmjs.org'
+
+    - name: Create npm package
+      run: |
+        cd src
+        npm version ${{ steps.get_version.outputs.version_number }}
+        npm ci
+        npm run build
+        npm pack
+    
+    - name: Publish package
+      run: |
+        cd src
+        npm publish --provenance --access public
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index c988b00..6df729b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 _*
-**/node_modules
\ No newline at end of file
+**/node_modules
+**/built
\ No newline at end of file
diff --git a/.vscode/launch.json b/.vscode/launch.json
index c1854bb..8741231 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -14,6 +14,23 @@
       ],
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen"
+    },
+    {
+      "name": "Debug Multifile",
+      "type": "node",
+      "request": "launch",
+      "program": "${workspaceRoot}/src/built/index.js",
+      "args": [
+        "-r",
+        "./samples/multiFile/invalid/duplicatePropertyname/sample/",
+        "-s",
+        "schemas/multiFile.relations.json",
+        "-o",
+        "_out/validationErrors.json"
+      ],
+      "preLaunchTask": "npm: build - src",
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index d24ef48..d9e0f08 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -1,14 +1,23 @@
 {
-	"version": "2.0.0",
-	"tasks": [
-		{
-			"type": "npm",
-			"script": "test",
-			"path": "tests",
-			"group": "test",
-			"problemMatcher": [],
-			"label": "npm: test - tests",
-			"detail": "jest"
-		}
-	]
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "npm",
+      "script": "test",
+      "path": "tests",
+      "group": "test",
+      "problemMatcher": [],
+      "label": "npm: test - tests",
+      "detail": "jest"
+    },
+    {
+      "type": "npm",
+      "script": "build",
+      "path": "src",
+      "group": "build",
+      "problemMatcher": [],
+      "label": "npm: build - src",
+      "detail": "tsc"
+    }
+  ]
 }
\ No newline at end of file
diff --git a/src/built/validateRels.js b/src/built/validateRels.js
deleted file mode 100644
index 2fe844e..0000000
--- a/src/built/validateRels.js
+++ /dev/null
@@ -1,414 +0,0 @@
-var __assign = (this && this.__assign) || function () {
-    __assign = Object.assign || function(t) {
-        for (var s, i = 1, n = arguments.length; i < n; i++) {
-            s = arguments[i];
-            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-                t[p] = s[p];
-        }
-        return t;
-    };
-    return __assign.apply(this, arguments);
-};
-var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
-    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
-    return new (P || (P = Promise))(function (resolve, reject) {
-        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
-        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
-        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
-        step((generator = generator.apply(thisArg, _arguments || [])).next());
-    });
-};
-var __generator = (this && this.__generator) || function (thisArg, body) {
-    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
-    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
-    function verb(n) { return function (v) { return step([n, v]); }; }
-    function step(op) {
-        if (f) throw new TypeError("Generator is already executing.");
-        while (g && (g = 0, op[0] && (_ = 0)), _) try {
-            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
-            if (y = 0, t) op = [op[0] & 2, t.value];
-            switch (op[0]) {
-                case 0: case 1: t = op; break;
-                case 4: _.label++; return { value: op[1], done: false };
-                case 5: _.label++; y = op[1]; op = [0]; continue;
-                case 7: op = _.ops.pop(); _.trys.pop(); continue;
-                default:
-                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
-                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
-                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
-                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
-                    if (t[2]) _.ops.pop();
-                    _.trys.pop(); continue;
-            }
-            op = body.call(thisArg, _);
-        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
-        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
-    }
-};
-var __asyncValues = (this && this.__asyncValues) || function (o) {
-    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator], i;
-    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
-    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
-    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
-};
-import { createRequire as _createRequire } from "module";
-var __require = _createRequire(import.meta.url);
-import { glob } from 'glob';
-var jp = __require("jsonpath-plus");
-var fs = __require("fs");
-function query(obj, query) {
-    return jp.JSONPath({ path: query, resultType: 'all', json: obj });
-}
-function validateMultiFileRels(rootFolder, relationsSpec) {
-    return __awaiter(this, void 0, void 0, function () {
-        var _a, scope, selector, allDiagnostics, fileContextIterator, _b, fileContextIterator_1, fileContextIterator_1_1, fileContext, fullPath, fullPosixPath, fileNames, relObjs, _c, fileNames_1, fileNames_1_1, fileName, content, obj, e_1_1, diagnostics, e_2_1;
-        var _d, e_2, _e, _f, _g, e_1, _h, _j;
-        return __generator(this, function (_k) {
-            switch (_k.label) {
-                case 0:
-                    _a = relationsSpec.multiFile, scope = _a.scope, selector = _a.selector;
-                    allDiagnostics = new Array();
-                    fileContextIterator = glob.iterate(scope, { cwd: rootFolder, posix: true, withFileTypes: true });
-                    _k.label = 1;
-                case 1:
-                    _k.trys.push([1, 20, 21, 26]);
-                    _b = true, fileContextIterator_1 = __asyncValues(fileContextIterator);
-                    _k.label = 2;
-                case 2: return [4 /*yield*/, fileContextIterator_1.next()];
-                case 3:
-                    if (!(fileContextIterator_1_1 = _k.sent(), _d = fileContextIterator_1_1.done, !_d)) return [3 /*break*/, 19];
-                    _f = fileContextIterator_1_1.value;
-                    _b = false;
-                    fileContext = _f;
-                    fullPath = fileContext.fullpath();
-                    fullPosixPath = fullPath.replace(/\\/g, '/');
-                    return [4 /*yield*/, glob.glob(selector, { cwd: fileContext.toString(), posix: true })];
-                case 4:
-                    fileNames = _k.sent();
-                    relObjs = new Array(fileNames.length);
-                    _k.label = 5;
-                case 5:
-                    _k.trys.push([5, 11, 12, 17]);
-                    _c = true, fileNames_1 = (e_1 = void 0, __asyncValues(fileNames));
-                    _k.label = 6;
-                case 6: return [4 /*yield*/, fileNames_1.next()];
-                case 7:
-                    if (!(fileNames_1_1 = _k.sent(), _g = fileNames_1_1.done, !_g)) return [3 /*break*/, 10];
-                    _j = fileNames_1_1.value;
-                    _c = false;
-                    fileName = _j;
-                    return [4 /*yield*/, fs.promises.readFile(fileName, { encoding: 'utf-8' })];
-                case 8:
-                    content = _k.sent();
-                    obj = JSON.parse(content);
-                    relObjs.push({ name: fileName, value: obj });
-                    _k.label = 9;
-                case 9:
-                    _c = true;
-                    return [3 /*break*/, 6];
-                case 10: return [3 /*break*/, 17];
-                case 11:
-                    e_1_1 = _k.sent();
-                    e_1 = { error: e_1_1 };
-                    return [3 /*break*/, 17];
-                case 12:
-                    _k.trys.push([12, , 15, 16]);
-                    if (!(!_c && !_g && (_h = fileNames_1.return))) return [3 /*break*/, 14];
-                    return [4 /*yield*/, _h.call(fileNames_1)];
-                case 13:
-                    _k.sent();
-                    _k.label = 14;
-                case 14: return [3 /*break*/, 16];
-                case 15:
-                    if (e_1) throw e_1.error;
-                    return [7 /*endfinally*/];
-                case 16: return [7 /*endfinally*/];
-                case 17:
-                    diagnostics = validateTreeRels(relObjs, relationsSpec);
-                    allDiagnostics = allDiagnostics.concat(diagnostics);
-                    _k.label = 18;
-                case 18:
-                    _b = true;
-                    return [3 /*break*/, 2];
-                case 19: return [3 /*break*/, 26];
-                case 20:
-                    e_2_1 = _k.sent();
-                    e_2 = { error: e_2_1 };
-                    return [3 /*break*/, 26];
-                case 21:
-                    _k.trys.push([21, , 24, 25]);
-                    if (!(!_b && !_d && (_e = fileContextIterator_1.return))) return [3 /*break*/, 23];
-                    return [4 /*yield*/, _e.call(fileContextIterator_1)];
-                case 22:
-                    _k.sent();
-                    _k.label = 23;
-                case 23: return [3 /*break*/, 25];
-                case 24:
-                    if (e_2) throw e_2.error;
-                    return [7 /*endfinally*/];
-                case 25: return [7 /*endfinally*/];
-                case 26: return [2 /*return*/, allDiagnostics];
-            }
-        });
-    });
-}
-function validateRels(objToValidate, relationsSpec) {
-    return validateTreeRels([{ name: '<anonymous>', value: objToValidate }], relationsSpec);
-}
-function validateTreeRels(objs, relationsSpec) {
-    var relations = relationsSpec.relations;
-    var relationIds = Object.keys(relations);
-    var uniqueIds = relationIds.filter(function (id) { return relations[id].unique; });
-    var keyIds = relationIds.filter(function (id) { return relations[id].key; });
-    var keyrefIds = relationIds.filter(function (id) { return relations[id].keyRef; });
-    var uniqueContextInfos = uniqueIds.map(function (id) {
-        var constraint = getIdentityConstraint(id, relations[id]);
-        return {
-            id: id,
-            constraint: constraint,
-            contexts: objs.flatMap(function (o) { return collectContexts(o, constraint); })
-        };
-    });
-    var uniqueDiagnostics = uniqueContextInfos.flatMap(function (i) { return validateUniqueContexts(i.contexts, i.constraint); });
-    var keyContextInfos = keyIds.map(function (id) {
-        var constraint = getIdentityConstraint(id, relations[id]);
-        return {
-            id: id,
-            constraint: constraint,
-            contexts: objs.flatMap(function (o) { return collectContexts(o, constraint); })
-        };
-    });
-    var keyDiagnostics = keyContextInfos.flatMap(function (i) { return getKeyDiagnostics(i.contexts, i.constraint); });
-    var qualifiedReferNodesById = new Map(uniqueContextInfos.concat(keyContextInfos)
-        .map(function (ci) { return [ci.id, ci.contexts.flatMap(function (c) { return c.nodes.filter(isQualified); })]; }));
-    var keyRefContextInfos = keyrefIds.map(function (id) {
-        var constraint = getIdentityConstraint(id, relations[id]);
-        return {
-            id: id,
-            constraint: constraint,
-            contexts: objs.flatMap(function (o) { return collectContexts(o, constraint); })
-        };
-    });
-    var keyrefDiagnostics = keyRefContextInfos.flatMap(function (i) { return validateKeyrefContexts(i.contexts, qualifiedReferNodesById.get(relations[i.id].keyRef.refer), i.constraint); });
-    return keyDiagnostics.concat(uniqueDiagnostics).concat(keyrefDiagnostics);
-}
-function getIdentityConstraint(id, relation) {
-    var _a, _b, _c;
-    if (relation.key) {
-        return {
-            id: id,
-            contextNodeSelector: (_a = relation.key.scope) !== null && _a !== void 0 ? _a : "$.",
-            selector: relation.key.selector,
-            fieldSelectors: typeof relation.key.field === 'string' ? [relation.key.field] : relation.key.field
-        };
-    }
-    if (relation.unique) {
-        return {
-            id: id,
-            contextNodeSelector: (_b = relation.unique.scope) !== null && _b !== void 0 ? _b : "$.",
-            selector: relation.unique.selector,
-            fieldSelectors: typeof relation.unique.field === 'string' ? [relation.unique.field] : relation.unique.field
-        };
-    }
-    if (relation.keyRef) {
-        return {
-            id: id,
-            contextNodeSelector: (_c = relation.keyRef.scope) !== null && _c !== void 0 ? _c : "$.",
-            selector: relation.keyRef.selector,
-            fieldSelectors: typeof relation.keyRef.field === 'string' ? [relation.keyRef.field] : relation.keyRef.field
-        };
-    }
-    throw new Error("unknown relation ".concat(id, ": ").concat(relation));
-}
-function validateKeyrefContexts(contexts, referNodes, constraint) {
-    return contexts.flatMap(function (_a) {
-        var nodes = _a.nodes;
-        return validateKeyRef(constraint, referNodes, nodes.filter(isQualified));
-    });
-}
-function validateKeyRef(constraint, referNodes, keyrefNodes) {
-    // use a separator that guarantees that different key sequences end up as different strings
-    var separator = "°#@";
-    var toKeySequenceId = function (ks) { return ks.join(separator); };
-    var keySequenceIds = new Set(referNodes.map(function (n) { return toKeySequenceId(n.keySequence.evaluated); }));
-    var invalidRefNodes = keyrefNodes.filter(function (n) { return !keySequenceIds.has(toKeySequenceId(n.keySequence.evaluated)); });
-    return invalidRefNodes.map(function (n) {
-        return {
-            instancePath: n.contextNode.pointer + n.targetNode.pointer,
-            keyword: "keyRef",
-            message: "invalid keyRef '".concat(n.keySequence.evaluated.join(', '), "'"),
-            params: {
-                relationId: constraint.id,
-                invalidRef: n.keySequence.evaluated.length === 1 ? n.keySequence.evaluated[0] : n.keySequence.evaluated
-            }
-        };
-    });
-}
-function validateUniqueContexts(contexts, constraint) {
-    return contexts.flatMap(function (_a) {
-        var nodes = _a.nodes;
-        return validateUnique(nodes, constraint);
-    });
-}
-function validateUnique(nodes, constraint) {
-    var qualifiedNodes = nodes.filter(isQualified);
-    var diagnostics = getUniqueDiagnostics(qualifiedNodes, constraint, "unique");
-    return diagnostics;
-}
-function getKeyDiagnostics(contexts, constraint) {
-    return contexts.flatMap(function (_a) {
-        var contextNode = _a.contextNode, nodes = _a.nodes;
-        var unqualifiedNodes = nodes.filter(function (n) { return !isQualified(n); });
-        var missingKeyDiagnostics = unqualifiedNodes.map(function (node) {
-            var missingFields = node.keySequence.nodes
-                .map(function (n, index) { return ({ field: n, fieldSelector: constraint.fieldSelectors[index] }); })
-                .filter(function (x) { return !x.field; });
-            var missingFieldPointers = missingFields.map(function (x) { return jp.JSONPath.toPointer(jp.JSONPath.toPathArray(x.fieldSelector)); });
-            // remove the leading '/'
-            var missingFieldRelativePointers = missingFieldPointers.map(function (p) { return p.substring(1); });
-            var missingFieldDescription = missingFieldRelativePointers.map(function (p) { return "'".concat(p, "'"); }).join(", ");
-            var message = missingFieldRelativePointers.length === 1
-                ? "property ".concat(missingFieldDescription, " is required")
-                : "properties ".concat(missingFieldDescription, " are required");
-            return {
-                instancePath: node.contextNode.pointer + node.targetNode.pointer,
-                keyword: "key",
-                message: message,
-                params: {
-                    relationId: constraint.id,
-                    missingProperties: missingFieldPointers
-                }
-            };
-        });
-        var qualifiedNodes = nodes.filter(isQualified);
-        var uniqueDiagnostics = getUniqueDiagnostics(qualifiedNodes, constraint, "key");
-        return missingKeyDiagnostics.concat(uniqueDiagnostics);
-    });
-}
-function isQualified(node) {
-    return !!node.qualifiedNode &&
-        node.keySequence.nodes.every(function (k) { return k; }) &&
-        node.keySequence.evaluated.every(function (v) { return v !== null; });
-}
-function getUniqueDiagnostics(nodes, constraint, keyword) {
-    // when there is no value, the key is assumed to be a property name
-    var groups = groupByArray(nodes, function (n) { return n.keySequence.evaluated; }, tupleEquals);
-    var duplicateGroups = groups.filter(function (_a) {
-        var values = _a.values;
-        return values.length > 1;
-    });
-    var duplicateDiagnostics = duplicateGroups.map(function (_a) {
-        var key = _a.key, nodes = _a.values;
-        var node = nodes[0];
-        var fields = node.keySequence.nodes;
-        var nodeIsPropertyName = false;
-        var message;
-        if (fields.length === 1 && fields[0]) {
-            var field = fields[0];
-            var pointerSegments = node.targetNode.pointer.split('/').concat(field.pointer.split('/')).filter(function (segment) { return segment; });
-            var lastSegment = pointerSegments[pointerSegments.length - 1];
-            nodeIsPropertyName = lastSegment === node.targetNode.parentProperty;
-            if (nodeIsPropertyName) {
-                var parentSegment = pointerSegments[pointerSegments.length - 2];
-                message = "duplicate ".concat(parentSegment, " property '").concat(node.targetNode.parentProperty, "', property names in ").concat(parentSegment, " must be unique");
-            }
-        }
-        if (!message) {
-            var fieldDescription = toFieldDescription(node.keySequence.nodes);
-            var keyDescription = toValueDescription(key);
-            message = "duplicate ".concat(fieldDescription, " ").concat(keyDescription, ", ").concat(fieldDescription, " must be unique");
-        }
-        return {
-            instancePath: node.contextNode.pointer,
-            keyword: keyword,
-            message: message,
-            params: {
-                relationId: constraint.id,
-                duplicateValue: key.length === 1 ? key[0] : key,
-                duplicates: nodes.map(function (n) { return n.contextNode.pointer + n.targetNode.pointer; })
-            }
-        };
-    });
-    return duplicateDiagnostics;
-}
-function collectContexts(obj, constraint) {
-    var contextNodes = query(obj, constraint.contextNodeSelector);
-    var nodeInfos = contextNodes
-        .map(function (contextNode) {
-        var targetNodes = query(contextNode.value, constraint.selector);
-        return {
-            contextNode: contextNode,
-            nodes: targetNodes.map(function (t) {
-                var keySequenceNodes = constraint.fieldSelectors.map(function (s) { return queryField(t.value, s); });
-                var maybeQualifiedNode = keySequenceNodes.every(function (f) { return f; })
-                    ? __assign(__assign({}, t), { keySequenceNodes: keySequenceNodes.filter(function (f) { return f !== null; }) }) : null;
-                return {
-                    contextNode: contextNode,
-                    targetNode: t,
-                    qualifiedNode: maybeQualifiedNode,
-                    keySequence: {
-                        nodes: keySequenceNodes,
-                        evaluated: keySequenceNodes.map(function (n) { return n === null ? null : !n.parentProperty ? t.parentProperty : n.value; })
-                    }
-                };
-            })
-        };
-    });
-    return nodeInfos;
-}
-function queryField(obj, fieldSelector) {
-    var results = jp.JSONPath({ path: fieldSelector, resultType: 'all', json: obj });
-    if (results.length > 1) {
-        // see https://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions
-        throw new Error("A field selector must identify a single node. \"".concat(fieldSelector, "\" identified ").concat(results.map(function (r) { return r.pointer; }).join(", "), "."));
-    }
-    if (results.length === 1) {
-        return results[0];
-    }
-    return null;
-}
-function groupByArray(xs, getKey, keyEquals) {
-    return xs.reduce(function (rv, x) {
-        var v = getKey(x);
-        var el = rv.find(function (r) { return r && keyEquals(r.key, v); });
-        if (el) {
-            el.values.push(x);
-        }
-        else {
-            rv.push({ key: v, values: [x] });
-        }
-        return rv;
-    }, []);
-}
-function tupleEquals(t1, t2) {
-    if (t1.length !== t2.length) {
-        return false;
-    }
-    for (var index = 0; index < t1.length; index++) {
-        if (t1[index] !== t2[index]) {
-            return false;
-        }
-    }
-    return true;
-}
-function toFieldDescription(fields) {
-    return fields.length === 1
-        ? toSingleFieldDescription(fields[0])
-        : "composite (".concat(fields.map(function (f) { return toSingleFieldDescription(f); }).join(', '), ")");
-}
-function toSingleFieldDescription(field) {
-    return "'".concat(field.parentProperty, "'");
-}
-function toValueDescription(value) {
-    return value.length === 1
-        ? toSingleValueDescription(value[0])
-        : "(".concat(value.map(function (k) { return toSingleValueDescription(k); }).join(', '), ")");
-}
-function toSingleValueDescription(value) {
-    return typeof value === 'string'
-        ? "'".concat(value, "'")
-        : value;
-}
-module.exports = { validateMultiFileRels: validateMultiFileRels, validateRels: validateRels };
-//# sourceMappingURL=validateRels.js.map
\ No newline at end of file
diff --git a/src/built/validateRels.js.map b/src/built/validateRels.js.map
deleted file mode 100644
index 97713a3..0000000
--- a/src/built/validateRels.js.map
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..e25c4ce
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,47 @@
+#!/usr/bin/env node
+
+import { validateMultiFileRels } from './validateRels.js'
+import { Command } from 'commander'
+import fs from 'fs-extra'
+
+try {
+  const program = new Command();
+
+  program
+    .requiredOption('-r, --root <directory>', 'The root directory for relative paths and globs')
+    .requiredOption('-s, --settings <file>', 'The JSON relations definition file')
+
+  program.parse();
+  const options = program.opts();
+
+  const settingsFilePath = <string>(options.settings)
+  const rootPath = <string>(options.root)
+
+  let relationDefinition
+
+  try {
+    const relationsFileContent = await fs.readFile(settingsFilePath)
+    relationDefinition = JSON.parse(relationsFileContent.toString())
+  }
+  catch (error) {
+    process.exitCode = 1
+    console.error(`could not read file ${settingsFilePath}: ${error.message}` )
+  }
+
+  if (!(await fs.exists(rootPath))) {
+    process.exitCode = 1
+    console.error(`directory ${rootPath} does not exist`)
+  }
+
+  const diagnostics = await validateMultiFileRels(rootPath, relationDefinition)
+
+  process.stdout.write(JSON.stringify(diagnostics, null, 2))
+
+  if (diagnostics.length > 0) {
+    process.exitCode = 4
+  }
+}
+catch (error) {
+  console.error(error.message)
+  process.exitCode = 1
+}
\ No newline at end of file
diff --git a/src/package-lock.json b/src/package-lock.json
index 7637ca0..05d4eaf 100644
--- a/src/package-lock.json
+++ b/src/package-lock.json
@@ -1,24 +1,44 @@
 {
-  "name": "validate_rels",
-  "version": "1.0.0",
+  "name": "json-keyref",
+  "version": "0.0.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "validate_rels",
-      "version": "1.0.0",
+      "name": "json-keyref",
+      "version": "0.0.1",
       "license": "MIT",
       "dependencies": {
+        "commander": "^12.1.0",
+        "fs-extra": "^11.2.0",
         "glob": "^10.3.14",
-        "jsonpath-plus": "^8.1.0"
+        "jsonpath-plus": "^10.1.0"
+      },
+      "bin": {
+        "json-keyref": "built/index.js"
       },
       "devDependencies": {
-        "@types/glob": "^8.1.0",
+        "@types/fs-extra": "^11.0.4",
         "@types/jsonpath-plus": "^5.0.5",
         "@types/node": "^20.12.8",
+        "ts-node": "^10.9.2",
+        "tsconfig-paths": "^4.2.0",
         "typescript": "^5.4.5"
       }
     },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
+      "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -35,6 +55,58 @@
         "node": ">=12"
       }
     },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.0.tgz",
+      "integrity": "sha512-gv3ZRaISU3fjPAgNsriBRqGWQL6quFx04YMPW/zD8XMLsU32mhCCbfbO6KZFLjvYpCZ8zyDEgqsgf+PwPaM7GQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
+      "integrity": "sha512-3Belt6tdc8bPgAtbcmdtNJlirVoTmEb5e2gC94PnkwEW9jI6CAHUeoG85tjWP5WquqfavoMtMwiG4P926ZKKuQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
+    "node_modules/@jsep-plugin/assignment": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@jsep-plugin/assignment/-/assignment-1.2.1.tgz",
+      "integrity": "sha512-gaHqbubTi29aZpVbBlECRpmdia+L5/lh2BwtIJTmtxdbecEyyX/ejAOg7eQDGNvGOUmPY7Z2Yxdy9ioyH/VJeA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10.16.0"
+      },
+      "peerDependencies": {
+        "jsep": "^0.4.0||^1.0.0"
+      }
+    },
+    "node_modules/@jsep-plugin/regex": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@jsep-plugin/regex/-/regex-1.0.3.tgz",
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+      "license": "MIT",
+      "engines": {
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       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -44,13 +116,52 @@
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+    "node_modules/@tsconfig/node10": {
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+      "resolved": "https://registry.npmjs.org/@tsconfig/node10/-/node10-1.0.11.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node12": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node12/-/node12-1.0.11.tgz",
+      "integrity": "sha512-cqefuRsh12pWyGsIoBKJA9luFu3mRxCA+ORZvA4ktLSzIuCUtWVxGIuXigEwO5/ywWFMZ2QEGKWvkZG1zDMTag==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node14": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node14/-/node14-1.0.3.tgz",
+      "integrity": "sha512-ysT8mhdixWK6Hw3i1V2AeRqZ5WfXg1G43mqoYlM2nc6388Fq5jcXyr5mRsqViLx/GJYdoL0bfXD8nmF+Zn/Iow==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node16": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node16/-/node16-1.0.4.tgz",
+      "integrity": "sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/fs-extra": {
+      "version": "11.0.4",
+      "resolved": "https://registry.npmjs.org/@types/fs-extra/-/fs-extra-11.0.4.tgz",
+      "integrity": "sha512-yTbItCNreRooED33qjunPthRcSjERP1r4MqCZc7wv0u2sUkzTFp45tgUfS5+r7FrZPdmCCNflLhVSP/o+SemsQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/jsonfile": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/jsonfile": {
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+      "resolved": "https://registry.npmjs.org/@types/jsonfile/-/jsonfile-6.1.4.tgz",
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+      "license": "MIT",
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@@ -60,12 +171,6 @@
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@@ -75,6 +180,32 @@
         "undici-types": "~5.26.4"
       }
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+    "node_modules/acorn": {
+      "version": "8.12.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.12.1.tgz",
+      "integrity": "sha512-tcpGyI9zbizT9JbV6oYE477V6mTlXvvi0T0G3SNIYE2apm/G5huBa1+K89VGeovbg+jycCrfhl3ADxErOuO6Jg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/acorn-walk": {
+      "version": "8.3.3",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.3.3.tgz",
+      "integrity": "sha512-MxXdReSRhGO7VlFe1bRG/oI7/mdLV9B9JJT0N8vZOhF7gFRR5l3M8W9G8JxmKV+JC5mGqJ0QvqfSOLsCPa4nUw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^8.11.0"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/ansi-regex": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
@@ -97,6 +228,13 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/arg": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.3.tgz",
+      "integrity": "sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA==",
+      "dev": true,
+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -126,6 +264,22 @@
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     },
+    "node_modules/commander": {
+      "version": "12.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-12.1.0.tgz",
+      "integrity": "sha512-Vw8qHK3bZM9y/P10u3Vib8o/DdkvA2OtPtZvD871QKjy74Wj1WSKFILMPRPSdUSx5RFK1arlJzEtA4PkFgnbuA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/create-require": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
+      "integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
@@ -139,6 +293,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/diff": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.2.tgz",
+      "integrity": "sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
     "node_modules/eastasianwidth": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
@@ -164,6 +328,20 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/fs-extra": {
+      "version": "11.2.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-11.2.0.tgz",
+      "integrity": "sha512-PmDi3uwK5nFuXh7XDTlVnS17xJS7vW36is2+w3xcv8SVxiB4NyATf4ctkVY5bkSjX0Y4nbvZCq1/EjtEyr9ktw==",
+      "license": "MIT",
+      "dependencies": {
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^6.0.1",
+        "universalify": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=14.14"
+      }
+    },
     "node_modules/glob": {
       "version": "10.3.14",
       "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.14.tgz",
@@ -185,6 +363,12 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/graceful-fs": {
+      "version": "4.2.11",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
+      "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
+      "license": "ISC"
+    },
     "node_modules/is-fullwidth-code-point": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
@@ -215,16 +399,56 @@
         "@pkgjs/parseargs": "^0.11.0"
       }
     },
+    "node_modules/jsep": {
+      "version": "1.3.9",
+      "resolved": "https://registry.npmjs.org/jsep/-/jsep-1.3.9.tgz",
+      "integrity": "sha512-i1rBX5N7VPl0eYb6+mHNp52sEuaS2Wi8CDYx1X5sn9naevL78+265XJqy1qENEk7mRKwS06NHpUqiBwR7qeodw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10.16.0"
+      }
+    },
+    "node_modules/json5": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
+      "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "json5": "lib/cli.js"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/jsonfile": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
+      "integrity": "sha512-5dgndWOriYSm5cnYaJNhalLNDKOqFwyDB/rr1E9ZsGciGvKPs8R2xYGCacuf3z6K1YKDz182fd+fY3cn3pMqXQ==",
+      "license": "MIT",
+      "dependencies": {
+        "universalify": "^2.0.0"
+      },
+      "optionalDependencies": {
+        "graceful-fs": "^4.1.6"
+      }
+    },
     "node_modules/jsonpath-plus": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/jsonpath-plus/-/jsonpath-plus-8.1.0.tgz",
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+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/jsonpath-plus/-/jsonpath-plus-10.1.0.tgz",
+      "integrity": "sha512-gHfV1IYqH8uJHYVTs8BJX1XKy2/rR93+f8QQi0xhx95aCiXn1ettYAd5T+7FU6wfqyDoX/wy0pm/fL3jOKJ9Lg==",
+      "license": "MIT",
+      "dependencies": {
+        "@jsep-plugin/assignment": "^1.2.1",
+        "@jsep-plugin/regex": "^1.0.3",
+        "jsep": "^1.3.9"
+      },
       "bin": {
         "jsonpath": "bin/jsonpath-cli.js",
         "jsonpath-plus": "bin/jsonpath-cli.js"
       },
       "engines": {
-        "node": ">=14.0.0"
+        "node": ">=18.0.0"
       }
     },
     "node_modules/lru-cache": {
@@ -235,6 +459,13 @@
         "node": "14 || >=16.14"
       }
     },
+    "node_modules/make-error": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
+      "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/minimatch": {
       "version": "9.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.4.tgz",
@@ -249,6 +480,16 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/minipass": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.1.tgz",
@@ -398,6 +639,75 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha512-vavAMRXOgBVNF6nyEEmL3DBK19iRpDcoIwW+swQ+CbGiu7lju6t+JklA1MHweoWtadgt4ISVUsXLyDq34ddcwA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/ts-node": {
+      "version": "10.9.2",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
+      "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@cspotcode/source-map-support": "^0.8.0",
+        "@tsconfig/node10": "^1.0.7",
+        "@tsconfig/node12": "^1.0.7",
+        "@tsconfig/node14": "^1.0.0",
+        "@tsconfig/node16": "^1.0.2",
+        "acorn": "^8.4.1",
+        "acorn-walk": "^8.1.1",
+        "arg": "^4.1.0",
+        "create-require": "^1.1.0",
+        "diff": "^4.0.1",
+        "make-error": "^1.1.1",
+        "v8-compile-cache-lib": "^3.0.1",
+        "yn": "3.1.1"
+      },
+      "bin": {
+        "ts-node": "dist/bin.js",
+        "ts-node-cwd": "dist/bin-cwd.js",
+        "ts-node-esm": "dist/bin-esm.js",
+        "ts-node-script": "dist/bin-script.js",
+        "ts-node-transpile-only": "dist/bin-transpile.js",
+        "ts-script": "dist/bin-script-deprecated.js"
+      },
+      "peerDependencies": {
+        "@swc/core": ">=1.2.50",
+        "@swc/wasm": ">=1.2.50",
+        "@types/node": "*",
+        "typescript": ">=2.7"
+      },
+      "peerDependenciesMeta": {
+        "@swc/core": {
+          "optional": true
+        },
+        "@swc/wasm": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tsconfig-paths": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-4.2.0.tgz",
+      "integrity": "sha512-NoZ4roiN7LnbKn9QqE1amc9DJfzvZXxF4xDavcOWt1BPkdx+m+0gJuPM+S0vCe7zTJMYUP0R8pO2XMr+Y8oLIg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "json5": "^2.2.2",
+        "minimist": "^1.2.6",
+        "strip-bom": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.4.5",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
@@ -417,6 +727,22 @@
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       "dev": true
     },
+    "node_modules/universalify": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
+      "integrity": "sha512-gptHNQghINnc/vTGIk0SOFGFNXw7JVrlRUtConJRlvaw6DuX0wO5Jeko9sWrMBhh+PsYAZ7oXAiOnf/UKogyiw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10.0.0"
+      }
+    },
+    "node_modules/v8-compile-cache-lib": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
+      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -514,6 +840,16 @@
       "engines": {
         "node": ">=8"
       }
+    },
+    "node_modules/yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
     }
   }
 }
diff --git a/src/package.json b/src/package.json
index 2bc7802..be081ec 100644
--- a/src/package.json
+++ b/src/package.json
@@ -1,22 +1,44 @@
 {
-  "name": "validate_rels",
+  "name": "json-keyref",
+  "version": "0.0.1",
   "type": "module",
-  "version": "1.0.0",
-  "description": "Validates relations in JSON documents",
-  "main": "validate_rels.js",
+  "description": "Validates relations within one or multiple JSON files, such as key, keyref, uniqueness",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/shuebner/json_keyref.git"
+  },
+  "files": [
+    "built/"
+  ],
+  "bin": {
+    "json-keyref": "./built/index.js"
+  },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "tsc",
+    "start": "node ./built/index.js"
   },
-  "author": "",
+  "keywords": [
+    "json",
+    "key",
+    "keyref",
+    "unique",
+    "validation",
+    "relations"
+  ],
+  "author": "Sven Hübner",
   "license": "MIT",
   "dependencies": {
+    "commander": "^12.1.0",
+    "fs-extra": "^11.2.0",
     "glob": "^10.3.14",
-    "jsonpath-plus": "^8.1.0"
+    "jsonpath-plus": "^10.1.0"
   },
   "devDependencies": {
-    "@types/glob": "^8.1.0",
+    "@types/fs-extra": "^11.0.4",
     "@types/jsonpath-plus": "^5.0.5",
     "@types/node": "^20.12.8",
+    "ts-node": "^10.9.2",
+    "tsconfig-paths": "^4.2.0",
     "typescript": "^5.4.5"
   }
 }
diff --git a/src/tsconfig.json b/src/tsconfig.json
index 4a417d7..5ac2a94 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -1,13 +1,18 @@
 {
   "compilerOptions": {
     "outDir": "./built",
-    "allowJs": true,
-    "target": "es5",
-    "lib": ["es2015"],
-    "module": "nodenext",
+    "target": "ES2020",
+    "lib": ["es2020"],
+    "esModuleInterop": true,
+    "module": "ESNext",
+    "moduleResolution": "Node",
     "sourceMap": true,
     "strictNullChecks": true,
-    "noImplicitAny": true
+    "noImplicitAny": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
   },
   "include": ["./**/*"]
 }
\ No newline at end of file
diff --git a/src/validateRels.ts b/src/validateRels.ts
index 0137667..792dcd4 100644
--- a/src/validateRels.ts
+++ b/src/validateRels.ts
@@ -1,7 +1,7 @@
 import { glob } from 'glob'
-import jp = require('jsonpath-plus')
-import fs = require('fs')
-import path from 'path'
+import * as jp from 'jsonpath-plus'
+import * as fs from 'fs'
+import * as path from 'path'
 
 type JSONPathQueryResult =
   {
@@ -93,7 +93,7 @@ type FileContextInfo = {
   name: string,
 }
 
-async function validateMultiFileRels(rootFolder: string, relationsSpec: any): Promise<Diagnostic[]> {
+export async function validateMultiFileRels(rootFolder: string, relationsSpec: any): Promise<Diagnostic[]> {
   const { multiFile: { scope, selector } } = relationsSpec
 
   let allDiagnostics = new Array<Diagnostic>();
@@ -128,7 +128,7 @@ async function validateMultiFileRels(rootFolder: string, relationsSpec: any): Pr
   return allDiagnostics
 }
 
-function validateRels(objToValidate: object, relationsSpec: any): Diagnostic[] {
+export function validateRels(objToValidate: object, relationsSpec: any): Diagnostic[] {
   return validateTreeRels([{ fileContextInfo: null, value: objToValidate }], relationsSpec);
 }
 
@@ -388,7 +388,7 @@ function queryField(obj: any, fieldSelector: string): JSONPathQueryResult | null
 
   if (results.length > 1) {
     // see https://www.w3.org/TR/xmlschema-1/#cIdentity-constraint_Definitions
-    throw new Error(`A field selector must identify a single node. "${fieldSelector}" identified ${results.map(r => r.pointer).join(", ")}.`)
+    throw new Error(`A field selector must identify a single node. "${fieldSelector}" identified ${results.length} nodes: ${results.map(r => r.pointer).join(", ")}.`)
   }
 
   if (results.length === 1) {
@@ -447,6 +447,4 @@ function toSingleValueDescription(value: any[]) {
   return typeof value === 'string'
     ? `'${value}'`
     : value
-}
-
-module.exports = { validateMultiFileRels, validateRels }
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/tests/jest.config.js b/tests/jest.config.js
index b413e10..6c1e9ae 100644
--- a/tests/jest.config.js
+++ b/tests/jest.config.js
@@ -1,5 +1,5 @@
 /** @type {import('ts-jest').JestConfigWithTsJest} */
-module.exports = {
+export default {
   preset: 'ts-jest',
   testEnvironment: 'node',
 };
\ No newline at end of file
diff --git a/tests/package.json b/tests/package.json
index 2f4fb74..45f819f 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "test": "jest"
   },
+  "type": "module",
   "keywords": [],
   "author": "",
   "license": "ISC",