125 lines
5.4 KiB
Plaintext
125 lines
5.4 KiB
Plaintext
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"use strict";
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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var desc = Object.getOwnPropertyDescriptor(m, k);
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if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
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desc = { enumerable: true, get: function() { return m[k]; } };
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}
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Object.defineProperty(o, k2, desc);
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}) : (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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o[k2] = m[k];
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}));
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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Object.defineProperty(o, "default", { enumerable: true, value: v });
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}) : function(o, v) {
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o["default"] = v;
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});
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var __importStar = (this && this.__importStar) || function (mod) {
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if (mod && mod.__esModule) return mod;
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var result = {};
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if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
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__setModuleDefault(result, mod);
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return result;
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("@typescript-eslint/utils");
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const eslint_utils_1 = require("@typescript-eslint/utils/eslint-utils");
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const tsutils = __importStar(require("ts-api-utils"));
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const ts = __importStar(require("typescript"));
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const util_1 = require("../util");
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exports.default = (0, util_1.createRule)({
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name: 'non-nullable-type-assertion-style',
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meta: {
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docs: {
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description: 'Enforce non-null assertions over explicit type casts',
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recommended: 'stylistic',
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requiresTypeChecking: true,
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},
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fixable: 'code',
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messages: {
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preferNonNullAssertion: 'Use a ! assertion to more succinctly remove null and undefined from the type.',
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},
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schema: [],
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type: 'suggestion',
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},
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defaultOptions: [],
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create(context) {
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const services = (0, util_1.getParserServices)(context);
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const sourceCode = (0, eslint_utils_1.getSourceCode)(context);
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const getTypesIfNotLoose = (node) => {
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const type = services.getTypeAtLocation(node);
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if (tsutils.isTypeFlagSet(type, ts.TypeFlags.Any | ts.TypeFlags.Unknown)) {
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return undefined;
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}
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return tsutils.unionTypeParts(type);
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};
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const couldBeNullish = (type) => {
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if (type.flags & ts.TypeFlags.TypeParameter) {
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const constraint = type.getConstraint();
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return constraint == null || couldBeNullish(constraint);
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}
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else if (tsutils.isUnionType(type)) {
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for (const part of type.types) {
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if (couldBeNullish(part)) {
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return true;
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}
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}
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return false;
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}
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return (type.flags & (ts.TypeFlags.Null | ts.TypeFlags.Undefined)) !== 0;
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};
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const sameTypeWithoutNullish = (assertedTypes, originalTypes) => {
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const nonNullishOriginalTypes = originalTypes.filter(type => (type.flags & (ts.TypeFlags.Null | ts.TypeFlags.Undefined)) === 0);
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if (nonNullishOriginalTypes.length === originalTypes.length) {
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return false;
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}
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for (const assertedType of assertedTypes) {
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if (couldBeNullish(assertedType) ||
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!nonNullishOriginalTypes.includes(assertedType)) {
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return false;
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}
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}
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for (const originalType of nonNullishOriginalTypes) {
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if (!assertedTypes.includes(originalType)) {
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return false;
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}
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}
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return true;
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};
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const isConstAssertion = (node) => {
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return (node.typeAnnotation.type === utils_1.AST_NODE_TYPES.TSTypeReference &&
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node.typeAnnotation.typeName.type === utils_1.AST_NODE_TYPES.Identifier &&
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node.typeAnnotation.typeName.name === 'const');
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};
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return {
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'TSAsExpression, TSTypeAssertion'(node) {
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if (isConstAssertion(node)) {
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return;
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}
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const originalTypes = getTypesIfNotLoose(node.expression);
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if (!originalTypes) {
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return;
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}
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const assertedTypes = getTypesIfNotLoose(node.typeAnnotation);
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if (!assertedTypes) {
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return;
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}
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if (sameTypeWithoutNullish(assertedTypes, originalTypes)) {
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const expressionSourceCode = sourceCode.getText(node.expression);
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const higherPrecedenceThanUnary = (0, util_1.getOperatorPrecedence)(services.esTreeNodeToTSNodeMap.get(node.expression).kind, ts.SyntaxKind.Unknown) > util_1.OperatorPrecedence.Unary;
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context.report({
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fix(fixer) {
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return fixer.replaceText(node, higherPrecedenceThanUnary
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? `${expressionSourceCode}!`
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: `(${expressionSourceCode})!`);
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},
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messageId: 'preferNonNullAssertion',
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node,
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});
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}
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},
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};
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},
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});
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//# sourceMappingURL=non-nullable-type-assertion-style.js.map
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