mirror of
https://github.com/denoland/deno.git
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b40086fd7d
This commit changes "include_js_files!" macro from "deno_core"
in a way that "dir" option doesn't cause specifiers to be rewritten
to include it.
Example:
```
include_js_files! {
dir "js",
"hello.js",
}
```
The above definition required embedders to use:
`import ... from "internal:<ext_name>/js/hello.js"`.
But with this change, the "js" directory in which the files are stored
is an implementation detail, which for embedders results in:
`import ... from "internal:<ext_name>/hello.js"`.
The directory the files are stored in, is an implementation detail and
in some cases might result in a significant size difference for the
snapshot. As an example, in "deno_node" extension, we store the
source code in "polyfills" directory; which resulted in each specifier
to look like "internal:deno_node/polyfills/<module_name>", but with
this change it's "internal:deno_node/<module_name>".
Given that "deno_node" has over 100 files, many of them having
several import specifiers to the same extension, this change removes
10 characters from each import specifier.
89 lines
2 KiB
TypeScript
89 lines
2 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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import { ERR_INVALID_ARG_TYPE } from "internal:deno_node/internal/errors.ts";
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import { validateFunction } from "internal:deno_node/internal/validators.mjs";
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import { nextTick } from "internal:deno_node/process.ts";
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type Subscriber = (message: unknown, name?: string) => void;
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export class Channel {
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_subscribers: Subscriber[];
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name: string;
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constructor(name: string) {
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this._subscribers = [];
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this.name = name;
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}
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publish(message: unknown) {
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for (const subscriber of this._subscribers) {
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try {
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subscriber(message, this.name);
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} catch (err) {
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nextTick(() => {
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throw err;
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});
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}
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}
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}
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subscribe(subscription: Subscriber) {
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validateFunction(subscription, "subscription");
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this._subscribers.push(subscription);
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}
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unsubscribe(subscription: Subscriber) {
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if (!this._subscribers.includes(subscription)) {
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return false;
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}
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this._subscribers.splice(this._subscribers.indexOf(subscription), 1);
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return true;
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}
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get hasSubscribers() {
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return this._subscribers.length > 0;
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}
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}
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const channels: Record<string, Channel> = {};
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export function channel(name: string) {
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if (typeof name !== "string" && typeof name !== "symbol") {
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throw new ERR_INVALID_ARG_TYPE("channel", ["string", "symbol"], name);
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}
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if (!Object.hasOwn(channels, name)) {
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channels[name] = new Channel(name);
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}
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return channels[name];
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}
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export function hasSubscribers(name: string) {
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if (!Object.hasOwn(channels, name)) {
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return false;
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}
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return channels[name].hasSubscribers;
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}
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export function subscribe(name: string, subscription: Subscriber) {
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const c = channel(name);
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return c.subscribe(subscription);
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}
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export function unsubscribe(name: string, subscription: Subscriber) {
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const c = channel(name);
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return c.unsubscribe(subscription);
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}
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export default {
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channel,
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hasSubscribers,
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subscribe,
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unsubscribe,
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Channel,
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};
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