164 lines
6.6 KiB
Plaintext
164 lines
6.6 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 ts = __importStar(require("typescript"));
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const util_1 = require("../util");
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var Usefulness;
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(function (Usefulness) {
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Usefulness["Always"] = "always";
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Usefulness["Never"] = "will";
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Usefulness["Sometimes"] = "may";
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})(Usefulness || (Usefulness = {}));
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exports.default = (0, util_1.createRule)({
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name: 'no-base-to-string',
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meta: {
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docs: {
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description: 'Require `.toString()` to only be called on objects which provide useful information when stringified',
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recommended: 'recommended',
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requiresTypeChecking: true,
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},
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messages: {
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baseToString: "'{{name}}' {{certainty}} evaluate to '[object Object]' when stringified.",
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},
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schema: [
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{
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type: 'object',
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properties: {
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ignoredTypeNames: {
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type: 'array',
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items: {
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type: 'string',
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},
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},
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},
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additionalProperties: false,
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},
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],
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type: 'suggestion',
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},
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defaultOptions: [
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{
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ignoredTypeNames: ['Error', 'RegExp', 'URL', 'URLSearchParams'],
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},
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],
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create(context, [option]) {
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const services = (0, util_1.getParserServices)(context);
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const checker = services.program.getTypeChecker();
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const ignoredTypeNames = option.ignoredTypeNames ?? [];
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function checkExpression(node, type) {
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if (node.type === utils_1.AST_NODE_TYPES.Literal) {
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return;
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}
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const certainty = collectToStringCertainty(type ?? services.getTypeAtLocation(node));
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if (certainty === Usefulness.Always) {
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return;
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}
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context.report({
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data: {
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certainty,
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name: (0, eslint_utils_1.getSourceCode)(context).getText(node),
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},
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messageId: 'baseToString',
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node,
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});
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}
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function collectToStringCertainty(type) {
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const toString = checker.getPropertyOfType(type, 'toString');
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const declarations = toString?.getDeclarations();
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if (!toString || !declarations || declarations.length === 0) {
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return Usefulness.Always;
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}
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// Patch for old version TypeScript, the Boolean type definition missing toString()
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if (type.flags & ts.TypeFlags.Boolean ||
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type.flags & ts.TypeFlags.BooleanLiteral) {
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return Usefulness.Always;
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}
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if (ignoredTypeNames.includes((0, util_1.getTypeName)(checker, type))) {
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return Usefulness.Always;
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}
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if (declarations.every(({ parent }) => !ts.isInterfaceDeclaration(parent) || parent.name.text !== 'Object')) {
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return Usefulness.Always;
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}
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if (type.isIntersection()) {
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for (const subType of type.types) {
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const subtypeUsefulness = collectToStringCertainty(subType);
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if (subtypeUsefulness === Usefulness.Always) {
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return Usefulness.Always;
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}
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}
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return Usefulness.Never;
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}
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if (!type.isUnion()) {
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return Usefulness.Never;
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}
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let allSubtypesUseful = true;
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let someSubtypeUseful = false;
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for (const subType of type.types) {
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const subtypeUsefulness = collectToStringCertainty(subType);
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if (subtypeUsefulness !== Usefulness.Always && allSubtypesUseful) {
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allSubtypesUseful = false;
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}
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if (subtypeUsefulness !== Usefulness.Never && !someSubtypeUseful) {
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someSubtypeUseful = true;
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}
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}
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if (allSubtypesUseful && someSubtypeUseful) {
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return Usefulness.Always;
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}
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if (someSubtypeUseful) {
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return Usefulness.Sometimes;
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}
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return Usefulness.Never;
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}
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return {
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'AssignmentExpression[operator = "+="], BinaryExpression[operator = "+"]'(node) {
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const leftType = services.getTypeAtLocation(node.left);
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const rightType = services.getTypeAtLocation(node.right);
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if ((0, util_1.getTypeName)(checker, leftType) === 'string') {
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checkExpression(node.right, rightType);
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}
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else if ((0, util_1.getTypeName)(checker, rightType) === 'string' &&
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node.left.type !== utils_1.AST_NODE_TYPES.PrivateIdentifier) {
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checkExpression(node.left, leftType);
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}
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},
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'CallExpression > MemberExpression.callee > Identifier[name = "toString"].property'(node) {
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const memberExpr = node.parent;
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checkExpression(memberExpr.object);
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},
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TemplateLiteral(node) {
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if (node.parent.type === utils_1.AST_NODE_TYPES.TaggedTemplateExpression) {
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return;
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}
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for (const expression of node.expressions) {
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checkExpression(expression);
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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=no-base-to-string.js.map
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