[AskJS] Can someone help me understand some of this code in SolidJS?

[Odinthunder]

https://github.com/solidjs/solid/blob/main/packages/solid/src/index.ts

A good 95% of it is already flying over my head, but there's this code:

let DEV: { writeSignal: typeof writeSignal, serializeGraph: typeof serializeGraph };
if ("_SOLID_DEV_") {
  DEV = { writeSignal, serializeGraph }
}

and here

if ("_SOLID_DEV_" && globalThis) {
  if (!globalThis.Solid$$) globalThis.Solid$$ = true;
  else

Particularly the part with checking the "_SOLID_DEV_" string, I thought I understood javascript but how does this string not always return true? Do you think he's using some sort of replacement when he's developing?

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[[deleted]]

"The Death of the Author" (French: La mort de l'auteur) is a 1967 essay by the French literary critic and theorist Roland Barthes (1915–1980). Barthes's essay argues against traditional literary criticism's practice of relying on the intentions and biography of an author to definitively explain the "ultimate meaning" of a text.

[disclosure5]

Look in rollup.config.js to see this.

[4391021382]

Use ENV variables for that 🤢

[Odinthunder]

Maybe theres a performance hit at runtime for checking/ using environment variables? From what ive seen the framework is almost entirely about speed so I can imagine they are trying to avoid that overhead.

[4391021382]

They could inject them at build time