Step 3 / Select topic Node.js Hard

What this bank covers

• Immediates scheduled from the check phase
• Zero-delay timers are clamped to 1 ms
• Timeout delay overflow
• nextTick between two expired timers
• unref'd timers and process lifetime
• Cancelling a timer that is due in the same phase
• Microtasks between expired timer callbacks
• Hex decoding stops at the first unusable character
• subarray returns a view, not a copy
• base64url uses -_ and omits padding
• Buffer.from(TypedArray) copies the bytes
• Array values are coerced modulo 256
• Signed little-endian reads
• utf16le uses two bytes per code unit
• buf.write never writes a partial character
• 'ascii' is latin1 on write, high-bit stripped on read
• Buffer.concat honours totalLength exactly
• Immediate queue snapshot and the nextTick queue
• Zero-millisecond timers are clamped to 1 ms
• nextTick and microtasks between setImmediate callbacks
• Removing a listener during emit
• Adding a listener while emitting
• listeners() vs rawListeners() for once
• removeListener with a duplicated handler
• Unhandled 'error' events
• emit() return value with once()
• The newListener meta-event
• events.once() resolution value
• When does once() unregister?
• captureRejections and async listeners
• write() return value and the highWaterMark
• setEncoding and split multi-byte sequences
• Ordering of writes, 'end' and 'finish' in a pipe
• Duplex half-open behaviour
• Breaking out of for await over a Readable
• pipeline() error propagation and cleanup
• read(n) across buffered chunks
• cork/uncork needs _writev to batch
• Readable.from() with a string
• Writable backpressure in object mode
• truncateSync can grow a file
• readSync position argument and the file offset
• Writing past end of file with writeSync
• The exclusive open flag 'wx'
• readdirSync with withFileTypes
• Overwriting in place with 'r+' and writeSync
• Return value of recursive mkdirSync
• truncate to a length larger than the file
• Positional writeSync on a descriptor opened with 'a'
• statSync versus lstatSync on a symbolic link
• path.extname edge cases
• path.relative walks up to the common root
• Relative URL resolution against a base
• WHATWG URL normalization rules
• URLSearchParams serialization
• pathToFileURL escaping
• isAbsolute differs per platform flavor
• join does not restart at an absolute segment
• path.parse on a dotfile
• searchParams mutations are live on the URL
• exports rebinding vs module.exports
• Circular require returns partial exports
• require.cache and re-evaluation
• The CommonJS module wrapper arity
• Requiring a JSON file
• createRequire resolves relative to the filename's directory
• Directory resolution via package.json main
• require.cache controls module re-execution
• Extension resolution order for extensionless requires
• A module that throws is not left in require.cache
• events.errorMonitor
• Promise.any rejection shape
• Error cause option
• libuv error properties
• Abort errors
• Error-first callbacks
• Error cause is non-enumerable
• AssertionError.generatedMessage
• try/catch cannot catch async callback throws
• Env values are always strings
• Assigning undefined to process.env
• Deleting environment variables
• process.argv[0] and execPath
• Copying process.env is a snapshot
• Environment keys are case-sensitive on POSIX
• process.version versus process.versions.node
• process.hrtime and hrtime.bigint
• process.chdir and process.cwd
• process.env coerces every value to a string
• Awaiting a thenable costs an extra tick
• Returning a promise from an async function
• util.promisify.custom wins over callback wrapping
• Breaking out of for await closes the async iterator
• nextTick scheduled from inside a microtask
• AsyncLocalStorage propagation
• Promise.all receives promises, not functions
• events.once rejects on an error event
• for await over an array of promises
• Aborting an events.once promise