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71 lines
No EOL
3 KiB
Text
71 lines
No EOL
3 KiB
Text
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.isUnsafeAssignment = void 0;
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const utils_1 = require("@typescript-eslint/utils");
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const tsutils_1 = require("tsutils");
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const predicates_1 = require("./predicates");
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/**
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* Does a simple check to see if there is an any being assigned to a non-any type.
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*
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* This also checks generic positions to ensure there's no unsafe sub-assignments.
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* Note: in the case of generic positions, it makes the assumption that the two types are the same.
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*
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* @example See tests for examples
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*
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* @returns false if it's safe, or an object with the two types if it's unsafe
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*/
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function isUnsafeAssignment(type, receiver, checker, senderNode) {
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var _a, _b;
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if ((0, predicates_1.isTypeAnyType)(type)) {
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// Allow assignment of any ==> unknown.
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if ((0, predicates_1.isTypeUnknownType)(receiver)) {
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return false;
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}
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if (!(0, predicates_1.isTypeAnyType)(receiver)) {
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return { sender: type, receiver };
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}
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}
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if ((0, tsutils_1.isTypeReference)(type) && (0, tsutils_1.isTypeReference)(receiver)) {
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// TODO - figure out how to handle cases like this,
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// where the types are assignable, but not the same type
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/*
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function foo(): ReadonlySet<number> { return new Set<any>(); }
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// and
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type Test<T> = { prop: T }
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type Test2 = { prop: string }
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declare const a: Test<any>;
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const b: Test2 = a;
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*/
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if (type.target !== receiver.target) {
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// if the type references are different, assume safe, as we won't know how to compare the two types
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// the generic positions might not be equivalent for both types
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return false;
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}
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if ((senderNode === null || senderNode === void 0 ? void 0 : senderNode.type) === utils_1.AST_NODE_TYPES.NewExpression &&
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senderNode.callee.type === utils_1.AST_NODE_TYPES.Identifier &&
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senderNode.callee.name === 'Map' &&
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senderNode.arguments.length === 0 &&
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senderNode.typeParameters == null) {
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// special case to handle `new Map()`
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// unfortunately Map's default empty constructor is typed to return `Map<any, any>` :(
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// https://github.com/typescript-eslint/typescript-eslint/issues/2109#issuecomment-634144396
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return false;
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}
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const typeArguments = (_a = type.typeArguments) !== null && _a !== void 0 ? _a : [];
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const receiverTypeArguments = (_b = receiver.typeArguments) !== null && _b !== void 0 ? _b : [];
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for (let i = 0; i < typeArguments.length; i += 1) {
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const arg = typeArguments[i];
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const receiverArg = receiverTypeArguments[i];
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const unsafe = isUnsafeAssignment(arg, receiverArg, checker, senderNode);
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if (unsafe) {
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return { sender: type, receiver };
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}
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}
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return false;
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}
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return false;
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}
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exports.isUnsafeAssignment = isUnsafeAssignment;
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//# sourceMappingURL=isUnsafeAssignment.js.map |