| "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; |
| }; |
| Object.defineProperty(exports, "__esModule", { value: true }); |
| const experimental_utils_1 = require("@typescript-eslint/experimental-utils"); |
| const util = __importStar(require("../util")); |
| const getMemberExpressionName = (member) => { |
| if (!member.computed) { |
| return member.property.name; |
| } |
| if (member.property.type === experimental_utils_1.AST_NODE_TYPES.Literal && |
| typeof member.property.value === 'string') { |
| return member.property.value; |
| } |
| return null; |
| }; |
| exports.default = util.createRule({ |
| name: 'prefer-reduce-type-parameter', |
| meta: { |
| type: 'problem', |
| docs: { |
| category: 'Best Practices', |
| recommended: false, |
| description: 'Prefer using type parameter when calling `Array#reduce` instead of casting', |
| requiresTypeChecking: true, |
| }, |
| messages: { |
| preferTypeParameter: 'Unnecessary cast: Array#reduce accepts a type parameter for the default value.', |
| }, |
| fixable: 'code', |
| schema: [], |
| }, |
| defaultOptions: [], |
| create(context) { |
| const service = util.getParserServices(context); |
| const checker = service.program.getTypeChecker(); |
| return { |
| 'CallExpression > MemberExpression.callee'(callee) { |
| if (getMemberExpressionName(callee) !== 'reduce') { |
| return; |
| } |
| const [, secondArg] = callee.parent.arguments; |
| if (callee.parent.arguments.length < 2 || |
| !util.isTypeAssertion(secondArg)) { |
| return; |
| } |
| // Get the symbol of the `reduce` method. |
| const tsNode = service.esTreeNodeToTSNodeMap.get(callee.object); |
| const calleeObjType = util.getConstrainedTypeAtLocation(checker, tsNode); |
| // Check the owner type of the `reduce` method. |
| if (checker.isArrayType(calleeObjType)) { |
| context.report({ |
| messageId: 'preferTypeParameter', |
| node: secondArg, |
| fix: fixer => [ |
| fixer.removeRange([ |
| secondArg.range[0], |
| secondArg.expression.range[0], |
| ]), |
| fixer.removeRange([ |
| secondArg.expression.range[1], |
| secondArg.range[1], |
| ]), |
| fixer.insertTextAfter(callee, `<${context |
| .getSourceCode() |
| .getText(secondArg.typeAnnotation)}>`), |
| ], |
| }); |
| return; |
| } |
| }, |
| }; |
| }, |
| }); |
| //# sourceMappingURL=prefer-reduce-type-parameter.js.map |