+"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 tsutils = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var Rule = /** @class */ (function (_super) {
+ tslib_1.__extends(Rule, _super);
+ function Rule() {
+ return _super !== null && _super.apply(this, arguments) || this;
+ }
+ Rule.prototype.apply = function (sourceFile) {
+ return this.applyWithFunction(sourceFile, walk);
+ };
+ Rule.prototype.applyWithProgram = function (sourceFile, program) {
+ return this.applyWithFunction(sourceFile, walk, undefined, program.getTypeChecker());
+ };
+ Rule.metadata = {
+ description: "Prevents unnecessary and/or misleading scope bindings on functions.",
+ optionExamples: [true],
+ options: null,
+ optionsDescription: "Not configurable.",
+ rationale: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n `function` expressions that are immediately bound to `this` are equivalent to `() =>` arrow lambdas.\n Additionally, there's no use in binding a scope to an arrow lambda, as it already has one.\n "], ["\n \\`function\\` expressions that are immediately bound to \\`this\\` are equivalent to \\`() =>\\` arrow lambdas.\n Additionally, there's no use in binding a scope to an arrow lambda, as it already has one.\n "]))),
+ requiresTypeInfo: true,
+ ruleName: "unnecessary-bind",
+ type: "style",
+ typescriptOnly: false,
+ };
+ Rule.FAILURE_STRING_FUNCTION = "Don't bind `this` without arguments as a scope to a function. Use an arrow lambda instead.";
+ Rule.FAILURE_STRING_ARROW = "Don't bind scopes to arrow lambdas, as they already have a bound scope.";
+ return Rule;
+}(Lint.Rules.OptionallyTypedRule));
+exports.Rule = Rule;
+function walk(context, typeChecker) {
+ var variableUsage = tsutils.collectVariableUsage(context.sourceFile);
+ function checkArrowFunction(node) {
+ if (node.arguments.length !== 1) {
+ return;
+ }
+ context.addFailureAtNode(node, Rule.FAILURE_STRING_ARROW);
+ }
+ function canFunctionExpressionBeFixed(callExpression, valueDeclaration) {
+ if (callExpression.arguments.length !== 1 ||
+ callExpression.arguments[0].kind !== ts.SyntaxKind.ThisKeyword ||
+ valueDeclaration.asteriskToken !== undefined ||
+ valueDeclaration.decorators !== undefined) {
+ return false;
+ }
+ var name = valueDeclaration.name;
+ if (name === undefined) {
+ return true;
+ }
+ var nameInfo = variableUsage.get(name);
+ return nameInfo === undefined || nameInfo.uses.length === 0;
+ }
+ function checkFunctionExpression(callExpression, valueDeclaration) {
+ if (!canFunctionExpressionBeFixed(callExpression, valueDeclaration)) {
+ return;
+ }
+ context.addFailureAtNode(callExpression, Rule.FAILURE_STRING_FUNCTION);
+ }
+ function getArrowFunctionDeclaration(node) {
+ if (typeChecker === undefined) {
+ return undefined;
+ }
+ var symbol = typeChecker.getTypeAtLocation(node).symbol;
+ if (symbol === undefined) {
+ return undefined;
+ }
+ var valueDeclaration = symbol.valueDeclaration;
+ if (valueDeclaration === undefined) {
+ return undefined;
+ }
+ if (!tsutils.isArrowFunction(valueDeclaration)) {
+ return undefined;
+ }
+ return valueDeclaration;
+ }
+ function isDecoratedPropertyMember(node) {
+ return (node.parent !== undefined &&
+ tsutils.isPropertyDeclaration(node.parent) &&
+ node.parent.decorators !== undefined);
+ }
+ function checkCallExpression(node) {
+ if (isDecoratedPropertyMember(node)) {
+ return;
+ }
+ var bindExpression = node.expression;
+ if (!isBindPropertyAccess(bindExpression)) {
+ return;
+ }
+ var boundExpression = Lint.unwrapParentheses(bindExpression.expression);
+ if (tsutils.isFunctionExpression(boundExpression)) {
+ checkFunctionExpression(node, boundExpression);
+ return;
+ }
+ var valueDeclaration = getArrowFunctionDeclaration(boundExpression);
+ if (valueDeclaration !== undefined) {
+ checkArrowFunction(node);
+ }
+ }
+ return ts.forEachChild(context.sourceFile, function callback(node) {
+ if (ts.isCallExpression(node)) {
+ checkCallExpression(node);
+ }
+ return ts.forEachChild(node, callback);
+ });
+}
+function isBindPropertyAccess(node) {
+ return ts.isPropertyAccessExpression(node) && node.name.text === "bind";
+}
+var templateObject_1;