115 lines
4.8 KiB
Plaintext
115 lines
4.8 KiB
Plaintext
"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 () {
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var ownKeys = function(o) {
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ownKeys = Object.getOwnPropertyNames || function (o) {
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var ar = [];
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for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
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return ar;
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};
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return ownKeys(o);
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};
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return 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 = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
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__setModuleDefault(result, mod);
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return result;
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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const tsutils = __importStar(require("ts-api-utils"));
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const util_1 = require("../util");
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exports.default = (0, util_1.createRule)({
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name: 'prefer-reduce-type-parameter',
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meta: {
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type: 'problem',
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docs: {
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description: 'Enforce using type parameter when calling `Array#reduce` instead of using a type assertion',
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recommended: 'strict',
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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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preferTypeParameter: 'Unnecessary assertion: Array#reduce accepts a type parameter for the default value.',
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},
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schema: [],
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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 checker = services.program.getTypeChecker();
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function isArrayType(type) {
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return tsutils
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.unionConstituents(type)
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.every(unionPart => tsutils
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.intersectionConstituents(unionPart)
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.every(t => checker.isArrayType(t) || checker.isTupleType(t)));
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}
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return {
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'CallExpression > MemberExpression.callee'(callee) {
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if (!(0, util_1.isStaticMemberAccessOfValue)(callee, context, 'reduce')) {
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return;
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}
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const [, secondArg] = callee.parent.arguments;
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if (callee.parent.arguments.length < 2) {
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return;
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}
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if ((0, util_1.isTypeAssertion)(secondArg)) {
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const initializerType = services.getTypeAtLocation(secondArg.expression);
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const assertedType = services.getTypeAtLocation(secondArg.typeAnnotation);
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const isAssertionNecessary = !checker.isTypeAssignableTo(initializerType, assertedType);
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// don't report this if the resulting fix will be a type error
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if (isAssertionNecessary) {
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return;
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}
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}
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else {
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return;
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}
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// Get the symbol of the `reduce` method.
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const calleeObjType = (0, util_1.getConstrainedTypeAtLocation)(services, callee.object);
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// Check the owner type of the `reduce` method.
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if (isArrayType(calleeObjType)) {
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context.report({
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node: secondArg,
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messageId: 'preferTypeParameter',
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fix: fixer => {
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const fixes = [
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fixer.removeRange([
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secondArg.range[0],
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secondArg.expression.range[0],
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]),
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fixer.removeRange([
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secondArg.expression.range[1],
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secondArg.range[1],
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]),
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];
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if (!callee.parent.typeArguments) {
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fixes.push(fixer.insertTextAfter(callee, `<${context.sourceCode.getText(secondArg.typeAnnotation)}>`));
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}
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return fixes;
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},
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});
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return;
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}
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},
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};
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},
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});
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