@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
184 lines • 8.64 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (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("ts-api-utils"));
const ts = __importStar(require("typescript"));
const util_1 = require("../util");
const astIgnoreKeys = new Set(['range', 'loc', 'parent']);
const isSameAstNode = (actualNode, expectedNode) => {
if (actualNode === expectedNode) {
return true;
}
if (actualNode &&
expectedNode &&
typeof actualNode === 'object' &&
typeof expectedNode === 'object') {
if (Array.isArray(actualNode) && Array.isArray(expectedNode)) {
if (actualNode.length !== expectedNode.length) {
return false;
}
return !actualNode.some((nodeEle, index) => !isSameAstNode(nodeEle, expectedNode[index]));
}
const actualNodeKeys = Object.keys(actualNode).filter(key => !astIgnoreKeys.has(key));
const expectedNodeKeys = Object.keys(expectedNode).filter(key => !astIgnoreKeys.has(key));
if (actualNodeKeys.length !== expectedNodeKeys.length) {
return false;
}
if (actualNodeKeys.some(actualNodeKey => !Object.hasOwn(expectedNode, actualNodeKey))) {
return false;
}
if (actualNodeKeys.some(actualNodeKey => !isSameAstNode(actualNode[actualNodeKey], expectedNode[actualNodeKey]))) {
return false;
}
return true;
}
return false;
};
exports.default = (0, util_1.createRule)({
name: 'no-duplicate-type-constituents',
meta: {
type: 'suggestion',
docs: {
description: 'Disallow duplicate constituents of union or intersection types',
recommended: 'recommended',
requiresTypeChecking: true,
},
fixable: 'code',
messages: {
duplicate: '{{type}} type constituent is duplicated with {{previous}}.',
unnecessary: 'Explicit undefined is unnecessary on an optional parameter.',
},
schema: [
{
additionalProperties: false,
type: 'object',
properties: {
ignoreIntersections: {
description: 'Whether to ignore `&` intersections.',
type: 'boolean',
},
ignoreUnions: {
description: 'Whether to ignore `|` unions.',
type: 'boolean',
},
},
},
],
},
defaultOptions: [
{
ignoreIntersections: false,
ignoreUnions: false,
},
],
create(context, [{ ignoreIntersections, ignoreUnions }]) {
const parserServices = (0, util_1.getParserServices)(context);
const { sourceCode } = context;
function checkDuplicate(node, forEachNodeType) {
const cachedTypeMap = new Map();
node.types.reduce((uniqueConstituents, constituentNode) => {
const constituentNodeType = parserServices.getTypeAtLocation(constituentNode);
if (tsutils.isIntrinsicErrorType(constituentNodeType)) {
return uniqueConstituents;
}
const report = (messageId, data) => {
const getUnionOrIntersectionToken = (where, at) => sourceCode[`getTokens${where}`](constituentNode, {
filter: token => ['|', '&'].includes(token.value),
}).at(at);
const beforeUnionOrIntersectionToken = getUnionOrIntersectionToken('Before', -1);
let afterUnionOrIntersectionToken;
let bracketBeforeTokens;
let bracketAfterTokens;
if (beforeUnionOrIntersectionToken) {
bracketBeforeTokens = sourceCode.getTokensBetween(beforeUnionOrIntersectionToken, constituentNode);
bracketAfterTokens = sourceCode.getTokensAfter(constituentNode, {
count: bracketBeforeTokens.length,
});
}
else {
afterUnionOrIntersectionToken = (0, util_1.nullThrows)(getUnionOrIntersectionToken('After', 0), util_1.NullThrowsReasons.MissingToken('union or intersection token', 'duplicate type constituent'));
bracketAfterTokens = sourceCode.getTokensBetween(constituentNode, afterUnionOrIntersectionToken);
bracketBeforeTokens = sourceCode.getTokensBefore(constituentNode, {
count: bracketAfterTokens.length,
});
}
context.report({
data,
messageId,
node: constituentNode,
loc: {
start: constituentNode.loc.start,
end: (bracketAfterTokens.at(-1) ?? constituentNode).loc.end,
},
fix: fixer => [
beforeUnionOrIntersectionToken,
...bracketBeforeTokens,
constituentNode,
...bracketAfterTokens,
afterUnionOrIntersectionToken,
].flatMap(token => (token ? fixer.remove(token) : [])),
});
};
const duplicatePrevious = uniqueConstituents.find(ele => isSameAstNode(ele, constituentNode)) ?? cachedTypeMap.get(constituentNodeType);
if (duplicatePrevious) {
report('duplicate', {
type: node.type === utils_1.AST_NODE_TYPES.TSIntersectionType
? 'Intersection'
: 'Union',
previous: sourceCode.getText(duplicatePrevious),
});
return uniqueConstituents;
}
forEachNodeType?.(constituentNodeType, report);
cachedTypeMap.set(constituentNodeType, constituentNode);
return [...uniqueConstituents, constituentNode];
}, []);
}
return {
...(!ignoreIntersections && {
TSIntersectionType: checkDuplicate,
}),
...(!ignoreUnions && {
TSUnionType: (node) => checkDuplicate(node, (constituentNodeType, report) => {
const maybeTypeAnnotation = node.parent;
if (maybeTypeAnnotation.type === utils_1.AST_NODE_TYPES.TSTypeAnnotation) {
const maybeIdentifier = maybeTypeAnnotation.parent;
if (maybeIdentifier.type === utils_1.AST_NODE_TYPES.Identifier &&
maybeIdentifier.optional) {
const maybeFunction = maybeIdentifier.parent;
if ((0, util_1.isFunctionOrFunctionType)(maybeFunction) &&
maybeFunction.params.includes(maybeIdentifier) &&
tsutils.isTypeFlagSet(constituentNodeType, ts.TypeFlags.Undefined)) {
report('unnecessary');
}
}
}
}),
}),
};
},
});
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