Complete reference of 200+ Svelte compiler error codes with descriptions, organized by feature (animations, attributes, bindings, blocks, components, CSS, declarations, directives, each blocks, effects, elements, event handlers, exports, imports, legacy syntax, modules, props, runes, scripts, slots, snippets, state, stores, styles, svelte elements, transitions, TypeScript); includes examples for complex errors like const tag scoping, CSS :global mixing, each block reassignment in runes mode, node placement HTML repair, snippet export restrictions, and state field declarations.