1 files changed, 121 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/noBooleanLiteralCompareRule.js b/node_modules/tslint/lib/rules/noBooleanLiteralCompareRule.js
new file mode 100644
index 000000000..23cef48d5
--- /dev/null
+++ b/node_modules/tslint/lib/rules/noBooleanLiteralCompareRule.js
@@ -0,0 +1,121 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2017 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 utils = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var Rule = (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING = function (negate) {
+        return "This expression is unnecessarily compared to a boolean. Just " + (negate ? "negate it" : "use it directly") + ".";
+    };
+    Rule.prototype.applyWithProgram = function (sourceFile, program) {
+        return this.applyWithFunction(sourceFile, function (ctx) { return walk(ctx, program.getTypeChecker()); });
+    };
+    return Rule;
+}(Lint.Rules.TypedRule));
+/* tslint:disable:object-literal-sort-keys */
+Rule.metadata = {
+    ruleName: "no-boolean-literal-compare",
+    description: "Warns on comparison to a boolean literal, as in `x === true`.",
+    hasFix: true,
+    optionsDescription: "Not configurable.",
+    options: null,
+    optionExamples: [true],
+    type: "style",
+    typescriptOnly: true,
+    requiresTypeInfo: true,
+};
+exports.Rule = Rule;
+function walk(ctx, checker) {
+    return ts.forEachChild(ctx.sourceFile, function cb(node) {
+        if (utils.isBinaryExpression(node)) {
+            var cmp = getBooleanComparison(node, checker);
+            if (cmp !== undefined) {
+                ctx.addFailureAtNode(cmp.expression, Rule.FAILURE_STRING(cmp.negate), fix(node, cmp));
+            }
+        }
+        return ts.forEachChild(node, cb);
+    });
+}
+function getBooleanComparison(node, checker) {
+    var cmp = deconstructComparison(node);
+    return cmp === undefined || !Lint.isTypeFlagSet(checker.getTypeAtLocation(cmp.expression), ts.TypeFlags.Boolean) ? undefined : cmp;
+}
+function fix(node, _a) {
+    var negate = _a.negate, expression = _a.expression;
+    var deleted = node.left === expression
+        ? Lint.Replacement.deleteFromTo(node.left.end, node.end)
+        : Lint.Replacement.deleteFromTo(node.getStart(), node.right.getStart());
+    if (!negate) {
+        return deleted;
+    }
+    else if (needsParenthesesForNegate(expression)) {
+        return [
+            deleted,
+            Lint.Replacement.appendText(node.getStart(), "!("),
+            Lint.Replacement.appendText(node.getEnd(), ")"),
+        ];
+    }
+    else {
+        return [
+            deleted,
+            Lint.Replacement.appendText(node.getStart(), "!"),
+        ];
+    }
+}
+function needsParenthesesForNegate(node) {
+    switch (node.kind) {
+        case ts.SyntaxKind.AsExpression:
+        case ts.SyntaxKind.BinaryExpression:
+            return true;
+        default:
+            return false;
+    }
+}
+function deconstructComparison(node) {
+    var left = node.left, operatorToken = node.operatorToken, right = node.right;
+    var eq = Lint.getEqualsKind(operatorToken);
+    if (eq === undefined) {
+        return undefined;
+    }
+    var leftValue = booleanFromExpression(left);
+    if (leftValue !== undefined) {
+        return { negate: leftValue !== eq.isPositive, expression: right };
+    }
+    var rightValue = booleanFromExpression(right);
+    if (rightValue !== undefined) {
+        return { negate: rightValue !== eq.isPositive, expression: left };
+    }
+    return undefined;
+}
+function booleanFromExpression(node) {
+    switch (node.kind) {
+        case ts.SyntaxKind.TrueKeyword:
+            return true;
+        case ts.SyntaxKind.FalseKeyword:
+            return false;
+        default:
+            return undefined;
+    }
+}