Added type assertion for json files

PR Checklist

• Addresses an existing open issue:fixesBug: [consistent-type-imports] Incorrectly suggestsimport type on import assertion #7527
• That issue was marked asaccepting prs
• Steps inContributing were taken

Overview

This PR addresses the issue wheretypescript-eslint/eslint-plugin throws an error when an import statement with type imports includes an import assertions.

Reproduction Code:

import*asaJsonfrom'./a.json' assert{type:'json'}constwhat:aJson.A;

Actual Behaviour

typescript-eslint provides an invalid TypeScript code as a fix and hence had to be addressed by adding a rule that checks for such import type assertions.

Expected Behaviour

Since typescript 4.5, import assertions are supported, soNo Error orAll is Ok is the expected output.

Changes made:

1. Modified rule inconsistent-type-imports.ts for type only import. Now it checks for absence of assertions and only then suggests the fix.

// checks for presence of import assertionsif(node.assertions.length===0){yield*fixInsertTypeSpecifierForImportDeclaration(fixer,node,false);}

2. Tweaked reporting conditions inconsistent-type-imports.ts for type only imports. Now it checks for absence of import assertions and only then reports the error.

/** checks if import has type assertions * ``` * import * as type from 'mod' assert { type: 'json' }; * ``` * https://github.com/typescript-eslint/typescript-eslint/issues/7527 */if(report.node.assertions.length===0){context.report({node:report.node,messageId:"typeOverValue",*fix(fixer){yield*fixToTypeImportDeclaration(fixer,report,sourceImports);}});}

3. Added a rule toconsistent-type-imports.test.ts which considers import assertion for json files as a valid rule.

{code:`      import * as Type from 'foo' assert { type: 'json' };      const a: typeof Type = Type;    `,options:[{prefer:'no-type-imports'}],dependencyConstraints:{typescript:'4.5',},},