solidjs/solid

Glossary

Project-specific terms used across this repository.

Term	Definition
Signal	A reactive value created by `createSignal` (`packages/solid/src/reactive/signal.ts`). Reads inside a tracking scope subscribe; writes notify subscribers.
Memo	A cached derived computation created by `createMemo` (`packages/solid/src/reactive/signal.ts`). Re-runs only when its tracked sources change and propagates only when the result actually differs (per `equals`).
Effect	A side-effect computation created by `createEffect` / `createRenderEffect` / `createComputed` (`packages/solid/src/reactive/signal.ts`). Re-runs when its tracked sources change. `createEffect` runs after the next microtask flush; `createRenderEffect` runs synchronously during the render phase; `createComputed` is internal/render-effect-like and never collected by Suspense.
Owner	The lexical context (`Owner` interface in `packages/solid/src/reactive/signal.ts`) that owns nested computations and cleanup callbacks. Every reactive primitive belongs to the current `Owner`, set by `createRoot`, `createComponent`, `runWithOwner`, etc.
Computation	The internal node type used for memos and effects (`Computation<Init, Next>` in `signal.ts`). Tracks sources, observers, state, and the function to re-run.
Listener	The currently-executing `Computation`. Reading a signal while `Listener` is non-null subscribes the listener to that signal.
Resource	An async data primitive created by `createResource` (`packages/solid/src/reactive/signal.ts`). Wraps a fetcher in a signal-like accessor with `loading`/`error` properties; integrates with `<Suspense>` and SSR streaming.
Store	A reactive proxy over a (possibly nested) plain object created by `createStore` (`packages/solid/store/src/store.ts`). Lazily allocates per-property signals on access.
Mutable store	A proxy created by `createMutable` (`packages/solid/store/src/mutable.ts`) that allows direct property assignment instead of an explicit setter.
Reconcile	A diff-and-patch strategy on stores via `reconcile` (`packages/solid/store/src/modifiers.ts`). Replaces a store sub-tree while preserving identity for unchanged children, keyed by an optional `key` field (default `"id"`).
Produce	An Immer-style mutation helper from `produce` (`packages/solid/store/src/modifiers.ts`) that lets you write `setStore(produce(s => s.x = 1))`.
`$PROXY` / `$TRACK` / `$RAW` / `$NODE` / `$HAS`	Internal symbols used by the reactive proxy traps (`packages/solid/store/src/store.ts`, `packages/solid/src/reactive/signal.ts`). `$RAW` returns the underlying value, `$TRACK` triggers self-tracking on a store node, `$PROXY` identifies a proxy.
`$DEVCOMP`	Symbol set on dev-only component wrappers so dev hooks can recognize them (`packages/solid/src/reactive/signal.ts`).
Transition	A concurrent rendering scope started by `startTransition` / `useTransition` (`packages/solid/src/reactive/signal.ts`). Suspended work runs against a shadow `tValue` until ready, then commits.
Hydration	Client-side process of attaching event handlers and reactive subscriptions to server-rendered HTML. Driven by `hydrate` from `solid-js/web` and the `sharedConfig` context in `packages/solid/src/render/hydration.ts`.
HydrationContext	A `{ id, count }` pair in `packages/solid/src/render/hydration.ts` that gives every nested component a unique id matching the SSR output.
Suspense boundary	A `<Suspense>` instance (`packages/solid/src/render/Suspense.ts`). Tracks pending resources via `SuspenseContext` and renders `fallback` until the count reaches zero.
SuspenseList	An experimental sibling control flow (`packages/solid/src/render/Suspense.ts`) that orders multiple Suspense boundaries (`forwards` / `backwards` / `together`) and supports `tail` collapsing.
Error boundary	An `<ErrorBoundary>` instance (defined in `packages/solid/src/reactive/signal.ts` as `catchError`). Captures errors from descendants and renders a fallback or invokes a callback.
`sharedConfig`	A module-level singleton (`packages/solid/src/render/hydration.ts`) that holds the current hydration context, the streaming registry, completed effects, and the resource map.
Renderer	A bundle of low-level operations (insert, spread, createElement, etc.) that the compiler emits calls into. The DOM renderer is `solid-js/web`; custom renderers come from `solid-js/universal`.
rxcore	The internal alias used inside `packages/solid/src` source to import core helpers from `dom-expressions`. The Rollup config (`packages/solid/rollup.config.js`) and Vitest config (`packages/solid/vite.config.mjs`) rewrite `rxcore` to `packages/solid/web/src/core` at build/test time.
dom-expressions	The sibling library that provides the low-level DOM/SSR runtime (`spread`, `insert`, `delegateEvents`, `template`, etc.) and the JSX type definitions. Solid is one consumer; `babel-plugin-jsx-dom-expressions` is the compiler half.
Universal renderer	A renderer object produced by `createRenderer` (`packages/solid/universal/src/index.ts`). Lets Solid drive any tree-shaped target (terminal UIs, canvas, native, etc.) when the compiler is run with `generate: "universal"`.
`solid-element`	Wraps a Solid component as a Web Components custom element. Distinct from `solid-js`; the source lives in `packages/solid-element/`.
changeset	A markdown file in `.changeset/` that describes an upcoming version bump for one or more packages. `pnpm bump` adds one; `pnpm release:only` consumes them via `@changesets/cli`.
dev build	A bundle compiled with the Rollup `replaceDev(true)` step, which substitutes the `_SOLID_DEV_` and `_DX_DEV_` placeholders for `true`. Activated by the `development` export condition in `packages/solid/package.json`.
`isServer` / `isDev`	Compile-time flags exported from `solid-js/web` (`packages/solid/web/src/index.ts` and `packages/solid/web/server/index.ts`). The renderer entry chosen by export conditions decides which value you get.
JSX runtime	The module the TS / Babel JSX transform uses (`solid-js/jsx-runtime`). For Solid this resolves to the same module as `solid-js`; the compiler does the heavy lifting via `babel-plugin-jsx-dom-expressions`, not the runtime.

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