vscode/.eslintplugin/code-no-dangerous-type-assertions.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as eslint from 'eslint';
import { TSESTree } from '@typescript-eslint/experimental-utils';
export = new class NoDangerousTypeAssertions implements eslint.Rule.RuleModule {
create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
// Disable in tests for now
if (context.getFilename().includes('.test')) {
return {};
}
return {
// Disallow type assertions on object literals: <T>{ ... } or {} as T
['TSTypeAssertion > ObjectExpression, TSAsExpression > ObjectExpression']: (node: any) => {
const objectNode = node as TSESTree.Node;
const parent = objectNode.parent as TSESTree.TSTypeAssertion | TSESTree.TSAsExpression;
if (
// Allow `as const` assertions
(parent.typeAnnotation.type === 'TSTypeReference' && parent.typeAnnotation.typeName.type === 'Identifier' && parent.typeAnnotation.typeName.name === 'const')
// For also now still allow `any` casts
|| (parent.typeAnnotation.type === 'TSAnyKeyword')
) {
return;
}
context.report({
node,
message: "Don't use type assertions for creating objects as this can hide type errors."
});
},
};
}
};