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Type guards return booleans and let execution continue. Assertion functions throw or validate and narrow on the same line. Most narrowing bugs stem from choosing the wrong pattern for your error handling strategy.

TypeScript's strict mode catches most type errors, but `this` binding bugs still slip through. Learn how explicit `this` parameter annotations prevent runtime context loss that noImplicitThis alone cannot detect.

A hands-on comfyui nsfw workflow guide: install ComfyUI, pick an uncensored SDXL checkpoint, wire the nodes, and fix the black-image bug.