Traversy Media - Singleton Pattern
https://blog.bitsrc.io/the-singleton-pattern-in-typescript-b906303fda93
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JavaScript
Catalin Pit - The 4 Creational Design Patterns In Node.js You Should Know
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PHP
Patrick Assoa Adou - A Generic PHP Singleton
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Java
Sonar Rules -
The Singleton design pattern should be used with care