no-unused-expressions.js
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"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
var _a;
Object.defineProperty(exports, "__esModule", { value: true });
const experimental_utils_1 = require("@typescript-eslint/experimental-utils");
const no_unused_expressions_1 = __importDefault(require("eslint/lib/rules/no-unused-expressions"));
const util = __importStar(require("../util"));
exports.default = util.createRule({
name: 'no-unused-expressions',
meta: {
type: 'suggestion',
docs: {
description: 'Disallow unused expressions',
category: 'Best Practices',
recommended: false,
extendsBaseRule: true,
},
schema: no_unused_expressions_1.default.meta.schema,
messages: (_a = no_unused_expressions_1.default.meta.messages) !== null && _a !== void 0 ? _a : {
unusedExpression: 'Expected an assignment or function call and instead saw an expression.',
},
},
defaultOptions: [
{
allowShortCircuit: false,
allowTernary: false,
allowTaggedTemplates: false,
},
],
create(context, options) {
const rules = no_unused_expressions_1.default.create(context);
const { allowShortCircuit = false, allowTernary = false } = options[0];
function isValidExpression(node) {
if (allowShortCircuit && node.type === experimental_utils_1.AST_NODE_TYPES.LogicalExpression) {
return isValidExpression(node.right);
}
if (allowTernary && node.type === experimental_utils_1.AST_NODE_TYPES.ConditionalExpression) {
return (isValidExpression(node.alternate) &&
isValidExpression(node.consequent));
}
return ((node.type === experimental_utils_1.AST_NODE_TYPES.ChainExpression &&
node.expression.type === experimental_utils_1.AST_NODE_TYPES.CallExpression) ||
node.type === experimental_utils_1.AST_NODE_TYPES.ImportExpression);
}
return {
ExpressionStatement(node) {
if (node.directive || isValidExpression(node.expression)) {
return;
}
rules.ExpressionStatement(node);
},
};
},
});
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