🐛 [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./"

[unicornware]

Description

This isn't an error, but a warning produced by Node.js:

(node:25986) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at /Users/lex/Projects/UNICORNWARE/react-survey-app/node_modules/@flex-development/tutils/package.json.
Update this package.json to use a subpath pattern like "./*".

Steps to reproduce

1. Build esm (or cjs-esm hybrid) project that uses @flex-development/tutils
2. See warning in terminal

Expected behavior

A warning should not be produced.

Relevant screenshots

N/A

Environment

• Node Version: 16.0.0
• OS: macOS v11.3.1
• Package Manager: yarn@3.0.2
• Package version(s): >=4.2.2
• Browser: N/A

Possible solution

• Add "./*": "./*" above "./": "./" or
• Replace "./": "./" with "./*": "./*" (for some versions of Node.12, this is not a viable solution) or
• Remove path mapping entirely

Additional context

• Node.js 12 reached End-of-Life status on April 30th, 2022
• Large projects are encountering the same warning:
  Update package.json: changed pattern "./" to "./*" microsoft/tslib#135
  DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at G:\SNWS\sn-micro-front-web-project-template\node_modules\postcss\package.json. postcss/postcss#1455

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