yarn --frozen-lockfile
yarn compile
yarn test

yarn run v1.22.22
$ mocha --require ts-node/register --timeout 5000 --ui bdd ./test/*.test.ts
(node:37537) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
(node:37537) [MODULE_TYPELESS_PACKAGE_JSON] Warning: Module type of file:///home/rubin/Desktop/yaml-language-server/test/arrUtils.test.ts is not specified and it doesn't parse as CommonJS.
Reparsing as ES module because module syntax was detected. This incurs a performance overhead.
To eliminate this warning, add "type": "module" to /home/rubin/Desktop/yaml-language-server/package.json.

SyntaxError[ @/home/rubin/Desktop/yaml-language-server/test/autoCompletion.test.ts ]:   x TypeScript import equals declaration is not supported in strip-only mode
    ,-[15:1]
 12 |   TestCustomSchemaProvider,
 13 |   toFsPath,
 14 | } from './utils/testHelper';
 15 | import assert = require('assert');
    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 16 | import path = require('path');
 17 | import { createExpectedCompletion } from './utils/verifyError';
 18 | import { ServiceSetup } from './utils/serviceSetup';
    `----
  x TypeScript import equals declaration is not supported in strip-only mode
    ,-[16:1]
 13 |   toFsPath,
 14 | } from './utils/testHelper';
 15 | import assert = require('assert');
 16 | import path = require('path');
    : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 17 | import { createExpectedCompletion } from './utils/verifyError';
 18 | import { ServiceSetup } from './utils/serviceSetup';
 19 | import { CompletionList, InsertTextFormat, MarkupContent, MarkupKind, Position } from 'vscode-languageserver-types';
    `----

    at parseTypeScript (node:internal/modules/typescript:67:15)
    at processTypeScriptCode (node:internal/modules/typescript:129:42)
    at stripTypeScriptModuleTypes (node:internal/modules/typescript:196:22)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:146:26)
    at defaultGetFormat (node:internal/modules/esm/get_format:209:36)
    at defaultLoad (node:internal/modules/esm/load:119:22)
    at async ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:519:32)
    at async ModuleJob._link (node:internal/modules/esm/module_job:115:19)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.