| "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 utils_1 = require("@typescript-eslint/utils"); |
| const tsutils = __importStar(require("tsutils")); |
| const ts = __importStar(require("typescript")); |
| const util = __importStar(require("../util")); |
| exports.default = util.createRule({ |
| name: 'non-nullable-type-assertion-style', |
| meta: { |
| docs: { |
| description: 'Prefers a non-null assertion over explicit type cast when possible', |
| recommended: false, |
| requiresTypeChecking: true, |
| suggestion: true, |
| }, |
| fixable: 'code', |
| messages: { |
| preferNonNullAssertion: 'Use a ! assertion to more succintly remove null and undefined from the type.', |
| }, |
| schema: [], |
| type: 'suggestion', |
| }, |
| defaultOptions: [], |
| create(context) { |
| const parserServices = util.getParserServices(context); |
| const checker = parserServices.program.getTypeChecker(); |
| const sourceCode = context.getSourceCode(); |
| const getTypesIfNotLoose = (node) => { |
| const type = checker.getTypeAtLocation(parserServices.esTreeNodeToTSNodeMap.get(node)); |
| if (tsutils.isTypeFlagSet(type, ts.TypeFlags.Any | ts.TypeFlags.Unknown)) { |
| return undefined; |
| } |
| return tsutils.unionTypeParts(type); |
| }; |
| const sameTypeWithoutNullish = (assertedTypes, originalTypes) => { |
| const nonNullishOriginalTypes = originalTypes.filter(type => type.flags !== ts.TypeFlags.Null && |
| type.flags !== ts.TypeFlags.Undefined); |
| if (nonNullishOriginalTypes.length === originalTypes.length) { |
| return false; |
| } |
| for (const assertedType of assertedTypes) { |
| if (!nonNullishOriginalTypes.includes(assertedType)) { |
| return false; |
| } |
| } |
| for (const originalType of nonNullishOriginalTypes) { |
| if (!assertedTypes.includes(originalType)) { |
| return false; |
| } |
| } |
| return true; |
| }; |
| const isConstAssertion = (node) => { |
| return (node.typeAnnotation.type === utils_1.AST_NODE_TYPES.TSTypeReference && |
| node.typeAnnotation.typeName.type === utils_1.AST_NODE_TYPES.Identifier && |
| node.typeAnnotation.typeName.name === 'const'); |
| }; |
| return { |
| 'TSAsExpression, TSTypeAssertion'(node) { |
| if (isConstAssertion(node)) { |
| return; |
| } |
| const originalTypes = getTypesIfNotLoose(node.expression); |
| if (!originalTypes) { |
| return; |
| } |
| const assertedTypes = getTypesIfNotLoose(node.typeAnnotation); |
| if (!assertedTypes) { |
| return; |
| } |
| if (sameTypeWithoutNullish(assertedTypes, originalTypes)) { |
| context.report({ |
| fix(fixer) { |
| return fixer.replaceText(node, `${sourceCode.getText(node.expression)}!`); |
| }, |
| messageId: 'preferNonNullAssertion', |
| node, |
| }); |
| } |
| }, |
| }; |
| }, |
| }); |
| //# sourceMappingURL=non-nullable-type-assertion-style.js.map |