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Learning Path

Node Runtime Internals

See how Node moves work through nextTick, promises, timers, I/O, check callbacks, and workers.

Step 1

Node queue priority

Understand nextTick, Promise, timer, and immediate order.

Step 2

fs.readFile and thread pool

See async fs leave the call stack.

Step 3

Thread pool saturation

Spot worker capacity pressure.

Step 4

setImmediate inside I/O

Reason about check phase behavior.