523 lines
22 KiB
Plaintext
523 lines
22 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 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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function parseChecksVoidReturn(checksVoidReturn) {
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switch (checksVoidReturn) {
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case false:
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return false;
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case true:
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case undefined:
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return {
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arguments: true,
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attributes: true,
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properties: true,
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returns: true,
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variables: true,
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};
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default:
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return {
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arguments: checksVoidReturn.arguments ?? true,
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attributes: checksVoidReturn.attributes ?? true,
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properties: checksVoidReturn.properties ?? true,
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returns: checksVoidReturn.returns ?? true,
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variables: checksVoidReturn.variables ?? true,
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};
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}
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}
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exports.default = (0, util_1.createRule)({
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name: 'no-misused-promises',
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meta: {
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docs: {
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description: 'Disallow Promises in places not designed to handle them',
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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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voidReturnArgument: 'Promise returned in function argument where a void return was expected.',
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voidReturnVariable: 'Promise-returning function provided to variable where a void return was expected.',
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voidReturnProperty: 'Promise-returning function provided to property where a void return was expected.',
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voidReturnReturnValue: 'Promise-returning function provided to return value where a void return was expected.',
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voidReturnAttribute: 'Promise-returning function provided to attribute where a void return was expected.',
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conditional: 'Expected non-Promise value in a boolean conditional.',
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spread: 'Expected a non-Promise value to be spreaded in an object.',
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},
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schema: [
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{
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type: 'object',
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additionalProperties: false,
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properties: {
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checksConditionals: {
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type: 'boolean',
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},
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checksVoidReturn: {
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oneOf: [
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{ type: 'boolean' },
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{
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additionalProperties: false,
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properties: {
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arguments: { type: 'boolean' },
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attributes: { type: 'boolean' },
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properties: { type: 'boolean' },
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returns: { type: 'boolean' },
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variables: { type: 'boolean' },
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},
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type: 'object',
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},
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],
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},
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checksSpreads: {
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type: 'boolean',
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},
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},
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},
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],
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type: 'problem',
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},
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defaultOptions: [
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{
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checksConditionals: true,
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checksVoidReturn: true,
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checksSpreads: true,
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},
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],
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create(context, [{ checksConditionals, checksVoidReturn, checksSpreads }]) {
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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 checkedNodes = new Set();
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const conditionalChecks = {
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ConditionalExpression: checkTestConditional,
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DoWhileStatement: checkTestConditional,
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ForStatement: checkTestConditional,
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IfStatement: checkTestConditional,
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LogicalExpression: checkConditional,
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'UnaryExpression[operator="!"]'(node) {
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checkConditional(node.argument, true);
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},
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WhileStatement: checkTestConditional,
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};
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checksVoidReturn = parseChecksVoidReturn(checksVoidReturn);
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const voidReturnChecks = checksVoidReturn
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? {
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...(checksVoidReturn.arguments && {
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CallExpression: checkArguments,
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NewExpression: checkArguments,
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}),
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...(checksVoidReturn.attributes && {
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JSXAttribute: checkJSXAttribute,
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}),
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...(checksVoidReturn.properties && {
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Property: checkProperty,
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}),
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...(checksVoidReturn.returns && {
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ReturnStatement: checkReturnStatement,
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}),
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...(checksVoidReturn.variables && {
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AssignmentExpression: checkAssignment,
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VariableDeclarator: checkVariableDeclaration,
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}),
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}
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: {};
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const spreadChecks = {
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SpreadElement: checkSpread,
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};
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function checkTestConditional(node) {
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if (node.test) {
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checkConditional(node.test, true);
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}
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}
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/**
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* This function analyzes the type of a node and checks if it is a Promise in a boolean conditional.
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* It uses recursion when checking nested logical operators.
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* @param node The AST node to check.
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* @param isTestExpr Whether the node is a descendant of a test expression.
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*/
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function checkConditional(node, isTestExpr = false) {
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// prevent checking the same node multiple times
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if (checkedNodes.has(node)) {
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return;
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}
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checkedNodes.add(node);
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if (node.type === utils_1.AST_NODE_TYPES.LogicalExpression) {
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// ignore the left operand for nullish coalescing expressions not in a context of a test expression
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if (node.operator !== '??' || isTestExpr) {
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checkConditional(node.left, isTestExpr);
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}
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// we ignore the right operand when not in a context of a test expression
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if (isTestExpr) {
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checkConditional(node.right, isTestExpr);
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}
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return;
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}
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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if (isAlwaysThenable(checker, tsNode)) {
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context.report({
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messageId: 'conditional',
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node,
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});
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}
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}
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function checkArguments(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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const voidArgs = voidFunctionArguments(checker, tsNode);
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if (voidArgs.size === 0) {
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return;
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}
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for (const [index, argument] of node.arguments.entries()) {
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if (!voidArgs.has(index)) {
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continue;
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}
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const tsNode = services.esTreeNodeToTSNodeMap.get(argument);
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if (returnsThenable(checker, tsNode)) {
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context.report({
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messageId: 'voidReturnArgument',
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node: argument,
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});
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}
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}
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}
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function checkAssignment(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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const varType = services.getTypeAtLocation(node.left);
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if (!isVoidReturningFunctionType(checker, tsNode.left, varType)) {
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return;
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}
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if (returnsThenable(checker, tsNode.right)) {
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context.report({
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messageId: 'voidReturnVariable',
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node: node.right,
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});
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}
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}
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function checkVariableDeclaration(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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if (tsNode.initializer === undefined || node.init == null) {
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return;
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}
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const varType = services.getTypeAtLocation(node.id);
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if (!isVoidReturningFunctionType(checker, tsNode.initializer, varType)) {
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return;
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}
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if (returnsThenable(checker, tsNode.initializer)) {
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context.report({
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messageId: 'voidReturnVariable',
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node: node.init,
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});
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}
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}
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function checkProperty(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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if (ts.isPropertyAssignment(tsNode)) {
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const contextualType = checker.getContextualType(tsNode.initializer);
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if (contextualType !== undefined &&
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isVoidReturningFunctionType(checker, tsNode.initializer, contextualType) &&
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returnsThenable(checker, tsNode.initializer)) {
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context.report({
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messageId: 'voidReturnProperty',
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node: node.value,
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});
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}
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}
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else if (ts.isShorthandPropertyAssignment(tsNode)) {
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const contextualType = checker.getContextualType(tsNode.name);
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if (contextualType !== undefined &&
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isVoidReturningFunctionType(checker, tsNode.name, contextualType) &&
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returnsThenable(checker, tsNode.name)) {
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context.report({
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messageId: 'voidReturnProperty',
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node: node.value,
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});
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}
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}
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else if (ts.isMethodDeclaration(tsNode)) {
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if (ts.isComputedPropertyName(tsNode.name)) {
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return;
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}
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const obj = tsNode.parent;
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// Below condition isn't satisfied unless something goes wrong,
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// but is needed for type checking.
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// 'node' does not include class method declaration so 'obj' is
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// always an object literal expression, but after converting 'node'
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// to TypeScript AST, its type includes MethodDeclaration which
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// does include the case of class method declaration.
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if (!ts.isObjectLiteralExpression(obj)) {
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return;
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}
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if (!returnsThenable(checker, tsNode)) {
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return;
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}
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const objType = checker.getContextualType(obj);
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if (objType === undefined) {
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return;
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}
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const propertySymbol = checker.getPropertyOfType(objType, tsNode.name.text);
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if (propertySymbol === undefined) {
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return;
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}
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const contextualType = checker.getTypeOfSymbolAtLocation(propertySymbol, tsNode.name);
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if (isVoidReturningFunctionType(checker, tsNode.name, contextualType)) {
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context.report({
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messageId: 'voidReturnProperty',
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node: node.value,
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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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function checkReturnStatement(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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if (tsNode.expression === undefined || node.argument == null) {
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return;
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}
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const contextualType = checker.getContextualType(tsNode.expression);
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if (contextualType !== undefined &&
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isVoidReturningFunctionType(checker, tsNode.expression, contextualType) &&
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returnsThenable(checker, tsNode.expression)) {
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context.report({
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messageId: 'voidReturnReturnValue',
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node: node.argument,
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});
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}
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}
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function checkJSXAttribute(node) {
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if (node.value == null ||
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node.value.type !== utils_1.AST_NODE_TYPES.JSXExpressionContainer) {
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return;
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}
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const expressionContainer = services.esTreeNodeToTSNodeMap.get(node.value);
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const expression = services.esTreeNodeToTSNodeMap.get(node.value.expression);
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const contextualType = checker.getContextualType(expressionContainer);
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if (contextualType !== undefined &&
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isVoidReturningFunctionType(checker, expressionContainer, contextualType) &&
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returnsThenable(checker, expression)) {
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context.report({
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messageId: 'voidReturnAttribute',
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node: node.value,
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});
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}
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}
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function checkSpread(node) {
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const tsNode = services.esTreeNodeToTSNodeMap.get(node);
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if (isSometimesThenable(checker, tsNode.expression)) {
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context.report({
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messageId: 'spread',
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node: node.argument,
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});
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}
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}
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return {
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...(checksConditionals ? conditionalChecks : {}),
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...(checksVoidReturn ? voidReturnChecks : {}),
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...(checksSpreads ? spreadChecks : {}),
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};
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},
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});
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function isSometimesThenable(checker, node) {
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const type = checker.getTypeAtLocation(node);
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for (const subType of tsutils.unionTypeParts(checker.getApparentType(type))) {
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if (tsutils.isThenableType(checker, node, subType)) {
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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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// Variation on the thenable check which requires all forms of the type (read:
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// alternates in a union) to be thenable. Otherwise, you might be trying to
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// check if something is defined or undefined and get caught because one of the
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// branches is thenable.
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function isAlwaysThenable(checker, node) {
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const type = checker.getTypeAtLocation(node);
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for (const subType of tsutils.unionTypeParts(checker.getApparentType(type))) {
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const thenProp = subType.getProperty('then');
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// If one of the alternates has no then property, it is not thenable in all
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// cases.
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if (thenProp === undefined) {
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return false;
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}
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// We walk through each variation of the then property. Since we know it
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// exists at this point, we just need at least one of the alternates to
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// be of the right form to consider it thenable.
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const thenType = checker.getTypeOfSymbolAtLocation(thenProp, node);
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let hasThenableSignature = false;
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for (const subType of tsutils.unionTypeParts(thenType)) {
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for (const signature of subType.getCallSignatures()) {
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if (signature.parameters.length !== 0 &&
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isFunctionParam(checker, signature.parameters[0], node)) {
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hasThenableSignature = true;
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break;
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}
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}
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// We only need to find one variant of the then property that has a
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// function signature for it to be thenable.
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if (hasThenableSignature) {
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break;
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}
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}
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// If no flavors of the then property are thenable, we don't consider the
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// overall type to be thenable
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if (!hasThenableSignature) {
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return false;
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}
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}
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// If all variants are considered thenable (i.e. haven't returned false), we
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// consider the overall type thenable
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return true;
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}
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function isFunctionParam(checker, param, node) {
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const type = checker.getApparentType(checker.getTypeOfSymbolAtLocation(param, node));
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for (const subType of tsutils.unionTypeParts(type)) {
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if (subType.getCallSignatures().length !== 0) {
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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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function checkThenableOrVoidArgument(checker, node, type, index, thenableReturnIndices, voidReturnIndices) {
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if (isThenableReturningFunctionType(checker, node.expression, type)) {
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thenableReturnIndices.add(index);
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}
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else if (isVoidReturningFunctionType(checker, node.expression, type)) {
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// If a certain argument accepts both thenable and void returns,
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// a promise-returning function is valid
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if (!thenableReturnIndices.has(index)) {
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voidReturnIndices.add(index);
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}
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}
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}
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// Get the positions of arguments which are void functions (and not also
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// thenable functions). These are the candidates for the void-return check at
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// the current call site.
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// If the function parameters end with a 'rest' parameter, then we consider
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// the array type parameter (e.g. '...args:Array<SomeType>') when determining
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// if trailing arguments are candidates.
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function voidFunctionArguments(checker, node) {
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// 'new' can be used without any arguments, as in 'let b = new Object;'
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// In this case, there are no argument positions to check, so return early.
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if (!node.arguments) {
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return new Set();
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}
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const thenableReturnIndices = new Set();
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||
|
const voidReturnIndices = new Set();
|
||
|
const type = checker.getTypeAtLocation(node.expression);
|
||
|
// We can't use checker.getResolvedSignature because it prefers an early '() => void' over a later '() => Promise<void>'
|
||
|
// See https://github.com/microsoft/TypeScript/issues/48077
|
||
|
for (const subType of tsutils.unionTypeParts(type)) {
|
||
|
// Standard function calls and `new` have two different types of signatures
|
||
|
const signatures = ts.isCallExpression(node)
|
||
|
? subType.getCallSignatures()
|
||
|
: subType.getConstructSignatures();
|
||
|
for (const signature of signatures) {
|
||
|
for (const [index, parameter] of signature.parameters.entries()) {
|
||
|
const decl = parameter.valueDeclaration;
|
||
|
let type = checker.getTypeOfSymbolAtLocation(parameter, node.expression);
|
||
|
// If this is a array 'rest' parameter, check all of the argument indices
|
||
|
// from the current argument to the end.
|
||
|
// Note - we currently do not support 'spread' arguments - adding support for them
|
||
|
// is tracked in https://github.com/typescript-eslint/typescript-eslint/issues/5744
|
||
|
if (decl && ts.isParameter(decl) && decl.dotDotDotToken) {
|
||
|
if (checker.isArrayType(type)) {
|
||
|
// Unwrap 'Array<MaybeVoidFunction>' to 'MaybeVoidFunction',
|
||
|
// so that we'll handle it in the same way as a non-rest
|
||
|
// 'param: MaybeVoidFunction'
|
||
|
type = checker.getTypeArguments(type)[0];
|
||
|
for (let i = index; i < node.arguments.length; i++) {
|
||
|
checkThenableOrVoidArgument(checker, node, type, i, thenableReturnIndices, voidReturnIndices);
|
||
|
}
|
||
|
}
|
||
|
else if (checker.isTupleType(type)) {
|
||
|
// Check each type in the tuple - for example, [boolean, () => void] would
|
||
|
// add the index of the second tuple parameter to 'voidReturnIndices'
|
||
|
const typeArgs = checker.getTypeArguments(type);
|
||
|
for (let i = index; i < node.arguments.length && i - index < typeArgs.length; i++) {
|
||
|
checkThenableOrVoidArgument(checker, node, typeArgs[i - index], i, thenableReturnIndices, voidReturnIndices);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
checkThenableOrVoidArgument(checker, node, type, index, thenableReturnIndices, voidReturnIndices);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
for (const index of thenableReturnIndices) {
|
||
|
voidReturnIndices.delete(index);
|
||
|
}
|
||
|
return voidReturnIndices;
|
||
|
}
|
||
|
/**
|
||
|
* @returns Whether any call signature of the type has a thenable return type.
|
||
|
*/
|
||
|
function anySignatureIsThenableType(checker, node, type) {
|
||
|
for (const signature of type.getCallSignatures()) {
|
||
|
const returnType = signature.getReturnType();
|
||
|
if (tsutils.isThenableType(checker, node, returnType)) {
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
/**
|
||
|
* @returns Whether type is a thenable-returning function.
|
||
|
*/
|
||
|
function isThenableReturningFunctionType(checker, node, type) {
|
||
|
for (const subType of tsutils.unionTypeParts(type)) {
|
||
|
if (anySignatureIsThenableType(checker, node, subType)) {
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
/**
|
||
|
* @returns Whether type is a void-returning function.
|
||
|
*/
|
||
|
function isVoidReturningFunctionType(checker, node, type) {
|
||
|
let hadVoidReturn = false;
|
||
|
for (const subType of tsutils.unionTypeParts(type)) {
|
||
|
for (const signature of subType.getCallSignatures()) {
|
||
|
const returnType = signature.getReturnType();
|
||
|
// If a certain positional argument accepts both thenable and void returns,
|
||
|
// a promise-returning function is valid
|
||
|
if (tsutils.isThenableType(checker, node, returnType)) {
|
||
|
return false;
|
||
|
}
|
||
|
hadVoidReturn ||= tsutils.isTypeFlagSet(returnType, ts.TypeFlags.Void);
|
||
|
}
|
||
|
}
|
||
|
return hadVoidReturn;
|
||
|
}
|
||
|
/**
|
||
|
* @returns Whether expression is a function that returns a thenable.
|
||
|
*/
|
||
|
function returnsThenable(checker, node) {
|
||
|
const type = checker.getApparentType(checker.getTypeAtLocation(node));
|
||
|
if (anySignatureIsThenableType(checker, node, type)) {
|
||
|
return true;
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
//# sourceMappingURL=no-misused-promises.js.map
|