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NIP-83: JavaScript Registry
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Alex Gleason
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NIP-83
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======
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JavaScript Registry
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-------------------
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`draft` `optional`
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JavaScript source files may be stored by relays, and then imported into web browsers or development environments.
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This NIP defines two kinds:
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- `8394` - JavaScript source file.
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- `8395` - TypeScript source file.
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In both cases, the `content` field contains the source code of the file.
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```json
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{
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"kind": 8394,
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"id": "c17cf2f43580ad8238703ea32fb55c90c93402ca1f7d38085381f32c0f00e459",
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"pubkey": "c5dce01ee61fc62f62e2a825e2d598a839653b3175e0dcc072b1fe3c885f84a7",
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"created_at": 1709848074,
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"tags": [],
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"content": "/**\n * Infinite async generator. Iterates messages pushed to it until closed.\n * Only one consumer is expected to use a Machina instance at a time.\n *\n * @example\n * ```ts\n * // Create the Machina instance\n * const machina = new Machina<string>();\n *\n * // Async generator loop\n * async function getMessages() {\n * for await (const msg of machina.stream()) {\n * console.log(msg);\n * }\n * }\n *\n * // Start the generator\n * getMessages();\n *\n * // Push messages to it\n * machina.push('hello!');\n * machina.push('whats up?');\n * machina.push('greetings');\n * ```\n */\nexport class Machina {\n #queue = [];\n #resolve;\n #aborted = false;\n\n constructor(signal) {\n if (signal?.aborted) {\n this.abort();\n } else {\n signal?.addEventListener('abort', () => this.abort(), { once: true });\n }\n }\n\n /** Get messages as an AsyncGenerator. */\n async *[Symbol.asyncIterator]() {\n while (!this.#aborted) {\n if (this.#queue.length) {\n yield this.#queue.shift();\n continue;\n }\n\n await new Promise((_resolve) => {\n this.#resolve = _resolve;\n });\n }\n\n throw new DOMException('The signal has been aborted', 'AbortError');\n }\n\n /** Push a message into the Machina instance, making it available to the consumer of `stream()`. */\n push(data) {\n this.#queue.push(data);\n this.#resolve?.();\n }\n\n /** Stops streaming and throws an error to the consumer. */\n abort() {\n this.#aborted = true;\n this.#resolve?.();\n }\n}\n",
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"sig": "f644529abdf7ea12c570800847ccc337201fe6c47ea8e09902017e04d6f87605c4c3ab7cece1189df9271a27df06e0da0c6f35375098004644d4dfbc38ba78e7"
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}
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```
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```json
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{
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"kind": 8395,
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"id": "3047567edd9d74f694c648850fef128963973379be6a42f49d40c90524fbc079",
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"pubkey": "c5dce01ee61fc62f62e2a825e2d598a839653b3175e0dcc072b1fe3c885f84a7",
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"created_at": 1709847680,
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"tags": [],
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"content": "/**\n * Infinite async generator. Iterates messages pushed to it until closed.\n * Only one consumer is expected to use a Machina instance at a time.\n *\n * @example\n * ```ts\n * // Create the Machina instance\n * const machina = new Machina<string>();\n *\n * // Async generator loop\n * async function getMessages() {\n * for await (const msg of machina.stream()) {\n * console.log(msg);\n * }\n * }\n *\n * // Start the generator\n * getMessages();\n *\n * // Push messages to it\n * machina.push('hello!');\n * machina.push('whats up?');\n * machina.push('greetings');\n * ```\n */\nexport class Machina<T> {\n #queue: T[] = [];\n #resolve: (() => void) | undefined;\n #aborted = false;\n\n constructor(signal?: AbortSignal) {\n if (signal?.aborted) {\n this.abort();\n } else {\n signal?.addEventListener('abort', () => this.abort(), { once: true });\n }\n }\n\n /** Get messages as an AsyncGenerator. */\n async *[Symbol.asyncIterator](): AsyncGenerator<T> {\n while (!this.#aborted) {\n if (this.#queue.length) {\n yield this.#queue.shift() as T;\n continue;\n }\n\n await new Promise<void>((_resolve) => {\n this.#resolve = _resolve;\n });\n }\n\n throw new DOMException('The signal has been aborted', 'AbortError');\n }\n\n /** Push a message into the Machina instance, making it available to the consumer of `stream()`. */\n push(data: T): void {\n this.#queue.push(data);\n this.#resolve?.();\n }\n\n /** Stops streaming and throws an error to the consumer. */\n private abort(): void {\n this.#aborted = true;\n this.#resolve?.();\n }\n}\n",
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"sig": "b01ab6e2273bc33594dde5634c68add95c6273b8a864bf8f4c8a85564db3e3df2c9981a3c5d8694cc4fa0e0f984635d6b51d5ca352eff96b7cb789c39429d303"
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}
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```
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## Immutability
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Source code events are considered immutable, and should NOT be deleted by supported clients or relays in response to kind `5` deletion requests.
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Relays may still remove content for any reason.
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Relays can indicate support for immutability by adding this NIP to their `supported_nips` field.
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## Gateway
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It is possible to import JavaScript modules in supported runtimes using an HTTP Nostr gateway:
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```
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https://<host>/<nip19>
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```
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A gateway will:
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- Try to look up the event (or else return 404).
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- Check that the event is of kind `8394` or `8395` (or else return 4xx).
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- Return the `content` field of the event as the response body.
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- Set an appropriate `Content-Type` header on the response.
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### Usage with web browsers
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Web browsers can use script tags to import JavaScript modules from a gateway:
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```html
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<script type="module" src="https://gateway.tld/note1xpr4vlkan460d9xxfzzslmcj393ewvmehe4y9ayagrys2f8mcpus9rk8kj"></script>
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```
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It is also possible to use module imports within the script tag:
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```html
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<script type="module">
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import { Machina } from 'https://gateway.tld/note1xpr4vlkan460d9xxfzzslmcj393ewvmehe4y9ayagrys2f8mcpus9rk8kj';
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</script>
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```
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See [JavaScript modules on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules) for more details.
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### Usage with Deno
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Like web browsers, Deno can import modules from a gateway using URLs:
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```js
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import { Machina } from 'https://gateway.tld/note1xpr4vlkan460d9xxfzzslmcj393ewvmehe4y9ayagrys2f8mcpus9rk8kj';
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```
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### Import maps
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Import maps are supported by both [Deno](https://docs.deno.com/runtime/manual/basics/import_maps) and [web browsers](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules#importing_modules_using_import_maps), enabling us to configure the Nostr HTTP gateway once, and then use Nostr identifiers within our code:
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```json
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{
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"imports": {
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"nostr/": "https://gateway.tld/"
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}
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}
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```
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Our code becomes:
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```js
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import { Machina } from 'nostr/note1xpr4vlkan460d9xxfzzslmcj393ewvmehe4y9ayagrys2f8mcpus9rk8kj';
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```
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Now if a gateway goes offline, we can switch to a different one by changing only the import map.
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## JavaScript formats
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Kind `8394` events may be JavaScript modules (with import/export statements) or IIFE (immediately-invoked function expression) scripts.
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Kind `8395` events are TypeScript modules.
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## Dependencies
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Modules may depend on other modules. In this case, import maps are NOT optional.
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All imports must either be absolute URLs, or they must use the `nostr/` prefix and be resolved using an import map.
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The user agent must resolve the import map before attempting to fetch the module.
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