--- /dev/null
+"use strict";
+/**
+ * @license
+ * Copyright 2014 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_1 = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var ALLOW_FAST_NULL_CHECKS = "allow-fast-null-checks";
+var ALLOW_NEW = "allow-new";
+var ALLOW_TAGGED_TEMPLATE = "allow-tagged-template";
+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, {
+ allowFastNullChecks: this.ruleArguments.indexOf(ALLOW_FAST_NULL_CHECKS) !== -1,
+ allowNew: this.ruleArguments.indexOf(ALLOW_NEW) !== -1,
+ allowTaggedTemplate: this.ruleArguments.indexOf(ALLOW_TAGGED_TEMPLATE) !== -1,
+ });
+ };
+ /* tslint:disable:object-literal-sort-keys */
+ Rule.metadata = {
+ ruleName: "no-unused-expression",
+ description: "Disallows unused expression statements.",
+ descriptionDetails: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n Unused expressions are expression statements which are not assignments or function calls\n (and thus usually no-ops)."], ["\n Unused expressions are expression statements which are not assignments or function calls\n (and thus usually no-ops)."]))),
+ rationale: Lint.Utils.dedent(templateObject_2 || (templateObject_2 = tslib_1.__makeTemplateObject(["\n Detects potential errors where an assignment or function call was intended."], ["\n Detects potential errors where an assignment or function call was intended."]))),
+ optionsDescription: Lint.Utils.dedent(templateObject_3 || (templateObject_3 = tslib_1.__makeTemplateObject(["\n Three arguments may be optionally provided:\n\n * `", "` allows to use logical operators to perform fast null checks and perform\n method or function calls for side effects (e.g. `e && e.preventDefault()`).\n * `", "` allows 'new' expressions for side effects (e.g. `new ModifyGlobalState();`.\n * `", "` allows tagged templates for side effects (e.g. `this.add\\`foo\\`;`."], ["\n Three arguments may be optionally provided:\n\n * \\`", "\\` allows to use logical operators to perform fast null checks and perform\n method or function calls for side effects (e.g. \\`e && e.preventDefault()\\`).\n * \\`", "\\` allows 'new' expressions for side effects (e.g. \\`new ModifyGlobalState();\\`.\n * \\`", "\\` allows tagged templates for side effects (e.g. \\`this.add\\\\\\`foo\\\\\\`;\\`."])), ALLOW_FAST_NULL_CHECKS, ALLOW_NEW, ALLOW_TAGGED_TEMPLATE),
+ options: {
+ type: "array",
+ items: {
+ type: "string",
+ enum: [ALLOW_FAST_NULL_CHECKS, ALLOW_NEW, ALLOW_TAGGED_TEMPLATE],
+ },
+ minLength: 0,
+ maxLength: 3,
+ },
+ optionExamples: [true, [true, ALLOW_FAST_NULL_CHECKS]],
+ type: "functionality",
+ typescriptOnly: false,
+ };
+ /* tslint:enable:object-literal-sort-keys */
+ Rule.FAILURE_STRING = "unused expression, expected an assignment or function call";
+ return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+ var checking = false;
+ var allowFastNullChecks = true;
+ return ts.forEachChild(ctx.sourceFile, cb);
+ function cb(node) {
+ if (checking) {
+ if (tsutils_1.isParenthesizedExpression(node) || tsutils_1.isVoidExpression(node)) {
+ return cb(node.expression);
+ }
+ else if (tsutils_1.isConditionalExpression(node)) {
+ noCheck(node.condition, cb);
+ return both(node.whenTrue, node.whenFalse);
+ }
+ else if (tsutils_1.isBinaryExpression(node)) {
+ switch (node.operatorToken.kind) {
+ case ts.SyntaxKind.CommaToken:
+ if (isIndirectEval(node)) {
+ return false;
+ }
+ return both(node.left, node.right);
+ case ts.SyntaxKind.AmpersandAmpersandToken:
+ case ts.SyntaxKind.BarBarToken:
+ if (allowFastNullChecks) {
+ noCheck(node.left, cb);
+ return cb(node.right);
+ }
+ }
+ }
+ noCheck(node, forEachChild);
+ return isUnusedExpression(node, ctx.options);
+ }
+ if (tsutils_1.isExpressionStatement(node)) {
+ allowFastNullChecks = ctx.options.allowFastNullChecks;
+ if (!isDirective(node)) {
+ check(node.expression, node);
+ }
+ allowFastNullChecks = true;
+ return false;
+ }
+ else if (tsutils_1.isVoidExpression(node)) {
+ // allow `void 0` and `void(0)`
+ if (!isLiteralZero(tsutils_1.isParenthesizedExpression(node.expression)
+ ? node.expression.expression
+ : node.expression)) {
+ check(node.expression);
+ }
+ return false;
+ }
+ else if (tsutils_1.isBinaryExpression(node) &&
+ node.operatorToken.kind === ts.SyntaxKind.CommaToken &&
+ !isIndirectEval(node)) {
+ check(node.left);
+ return cb(node.right);
+ }
+ return ts.forEachChild(node, cb);
+ }
+ function forEachChild(node) {
+ return ts.forEachChild(node, cb);
+ }
+ function check(node, failNode) {
+ checking = true;
+ if (cb(node)) {
+ ctx.addFailureAtNode(failNode === undefined ? node : failNode, Rule.FAILURE_STRING);
+ }
+ checking = false;
+ }
+ function noCheck(node, callback) {
+ var old = allowFastNullChecks;
+ checking = false;
+ allowFastNullChecks = true;
+ callback(node);
+ allowFastNullChecks = old;
+ checking = true;
+ }
+ function both(one, two) {
+ if (cb(one)) {
+ if (cb(two)) {
+ return true;
+ }
+ else {
+ ctx.addFailureAtNode(one, Rule.FAILURE_STRING);
+ }
+ }
+ else if (cb(two)) {
+ ctx.addFailureAtNode(two, Rule.FAILURE_STRING);
+ }
+ return false;
+ }
+}
+function isUnusedExpression(node, options) {
+ switch (node.kind) {
+ case ts.SyntaxKind.CallExpression:
+ case ts.SyntaxKind.YieldExpression:
+ case ts.SyntaxKind.DeleteExpression:
+ case ts.SyntaxKind.AwaitExpression:
+ case ts.SyntaxKind.PostfixUnaryExpression:
+ return false;
+ case ts.SyntaxKind.NewExpression:
+ return !options.allowNew;
+ case ts.SyntaxKind.TaggedTemplateExpression:
+ return !options.allowTaggedTemplate;
+ case ts.SyntaxKind.BinaryExpression:
+ return !tsutils_1.isAssignmentKind(node.operatorToken.kind);
+ case ts.SyntaxKind.PrefixUnaryExpression:
+ return (node.operator !== ts.SyntaxKind.PlusPlusToken &&
+ node.operator !== ts.SyntaxKind.MinusMinusToken);
+ default:
+ return true;
+ }
+}
+function isLiteralZero(node) {
+ return tsutils_1.isNumericLiteral(node) && node.text === "0";
+}
+function isIndirectEval(node) {
+ return (tsutils_1.isIdentifier(node.right) &&
+ node.right.text === "eval" &&
+ isLiteralZero(node.left) &&
+ node.parent.kind === ts.SyntaxKind.ParenthesizedExpression &&
+ node.parent.parent.kind === ts.SyntaxKind.CallExpression);
+}
+function isDirective(node) {
+ if (node.expression.kind !== ts.SyntaxKind.StringLiteral || !canContainDirective(node.parent)) {
+ return false;
+ }
+ var parent = node.parent;
+ // check if all previous statements in block are also directives
+ for (var i = parent.statements.indexOf(node) - 1; i >= 0; --i) {
+ var statement = parent.statements[i];
+ if (!tsutils_1.isExpressionStatement(statement) ||
+ statement.expression.kind !== ts.SyntaxKind.StringLiteral) {
+ return false;
+ }
+ }
+ return true;
+}
+function canContainDirective(node) {
+ switch (node.kind) {
+ case ts.SyntaxKind.SourceFile:
+ case ts.SyntaxKind.ModuleBlock:
+ return true;
+ case ts.SyntaxKind.Block:
+ switch (node.parent.kind) {
+ case ts.SyntaxKind.ArrowFunction:
+ case ts.SyntaxKind.FunctionExpression:
+ case ts.SyntaxKind.FunctionDeclaration:
+ case ts.SyntaxKind.MethodDeclaration:
+ case ts.SyntaxKind.Constructor:
+ case ts.SyntaxKind.GetAccessor:
+ case ts.SyntaxKind.SetAccessor:
+ return true;
+ default:
+ return false;
+ }
+ default:
+ return false;
+ }
+}
+var templateObject_1, templateObject_2, templateObject_3;
projects / dotfiles / .git / blobdiff