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Tutorials, announcements, and insights about structured concurrency

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scope Foreground ✓ values consumed Background scope exits ✗ automatically halted
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What is Strict Structured Concurrency?

In standard structured concurrency, background tasks can hold a scope open after the meaningful work is done. Strict structured concurrency corrects that lifetime model by reclaiming incidental work automatically.

Charles Lowell's profile

Charles Lowell

March 12, 2026

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Effection Blog AbortController.abort() Doesn't Mean It Stopped AbortController AbortController █ tick: STILL RUNNING tick: STILL RUNNING tick: STILL RUNNING >>> calling abort() >>> abort() returned task ended with: aborted >>> caller thinks it's done tick: STILL RUNNING tick: STILL RUNNING tick: STILL RUNNING tick: STILL RUNNING tick: STILL RUNNING ... keeps running Structured Concurrency Structured Concurrency █ tick: RUNNING tick: RUNNING tick: RUNNING >>> leaving scope >>> scope exited all children stopped cleanup is automatic

AbortController.abort() Doesn't Mean It Stopped

controller.abort() fires an event and returns immediately, but cleanup depends on every function honoring the signal. Structured concurrency inverts the default: scope owns lifetime, cleanup is automatic.

Taras Mankovski's profile

Taras Mankovski

February 13, 2026

Effection Blog Why JavaScript Needs Structured Concurrency Scope owns lifetime. Cleanup is guaranteed. Promises async fn() fetch() setTimeout() server.listen() ● still pending ● still ticking ● port still bound finally {} ? Effection function*() function*() spawned task fetch() setTimeout() server.listen() scope ends ✓ halted + cleaned up Async should just feel normal.

Why JavaScript Needs Structured Concurrency

Structured programming tamed the chaos of early computing. Structured concurrency does the same for async — and Effection brings it to JavaScript.

Taras Mankovski's profile

Taras Mankovski

February 6, 2026

Effection

Welcome to the Effection Blog

Introducing the new Effection blog - your source for tutorials, release announcements, and insights about structured concurrency in JavaScript.

Taras Mankovski's profile

Taras Mankovski

February 2, 2025