Grokking Node.js Design Patterns for Interviews/

...

/

Solution: Implement a Chainable Logger Config Builder

Solution: Implement a Chainable Logger Config Builder

Build a fluent config builder that conditionally assembles a nested logger configuration object, enforcing required output constraints.

We'll cover the following...

Solution explanation

  • Lines 2–6: We initialize internal fields for level, format, and outputs, keeping all output targets organized under a single object.

  • Lines 8–31: We define fluent setter methods that configure the logger—setLevel, useJsonFormat, and the destination methods (toConsole, toFile, toRemote). Each updates the relevant field and returns this to enable chaining.

  • Lines 34–40: In .build() ...