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When modules import each other
Circular dependencies occur when modules import each other. ES modules handle this gracefully, but it can cause issues.
// a.js
import { b } from "./b.js";
export const a = "A" + b;
// b.js
import { a } from "./a.js";
export const b = "B" + a;
Avoid circular dependencies by restructuring code or using a third module.