--- /dev/null
+"use strict";
+/**
+ * @license
+ * Copyright 2018 Palantir Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+var shownWarnings = new Set();
+/**
+ * Used to exit the program and display a friendly message without the callstack.
+ */
+var FatalError = /** @class */ (function (_super) {
+ tslib_1.__extends(FatalError, _super);
+ function FatalError(message, innerError) {
+ var _this = _super.call(this, message) || this;
+ _this.message = message;
+ _this.innerError = innerError;
+ _this.name = FatalError.NAME;
+ // Fix prototype chain for target ES5
+ Object.setPrototypeOf(_this, FatalError.prototype);
+ return _this;
+ }
+ FatalError.NAME = "FatalError";
+ return FatalError;
+}(Error));
+exports.FatalError = FatalError;
+function isError(possibleError) {
+ return possibleError != undefined && possibleError.message !== undefined;
+}
+exports.isError = isError;
+function showWarningOnce(message) {
+ if (!shownWarnings.has(message)) {
+ console.warn(message);
+ shownWarnings.add(message);
+ }
+}
+exports.showWarningOnce = showWarningOnce;
+function showRuleCrashWarning(message, ruleName, fileName) {
+ console.warn("The '" + ruleName + "' rule threw an error in '" + fileName + "':\n" + message);
+}
+exports.showRuleCrashWarning = showRuleCrashWarning;