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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.
113 lines
3 KiB
JavaScript
113 lines
3 KiB
JavaScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.
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// deno-lint-ignore-file
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import EE from "internal:deno_node/events.ts";
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function Stream(opts) {
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EE.call(this, opts);
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}
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Object.setPrototypeOf(Stream.prototype, EE.prototype);
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Object.setPrototypeOf(Stream, EE);
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Stream.prototype.pipe = function (dest, options) {
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// deno-lint-ignore no-this-alias
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const source = this;
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function ondata(chunk) {
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if (dest.writable && dest.write(chunk) === false && source.pause) {
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source.pause();
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}
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}
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source.on("data", ondata);
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function ondrain() {
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if (source.readable && source.resume) {
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source.resume();
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}
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}
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dest.on("drain", ondrain);
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// If the 'end' option is not supplied, dest.end() will be called when
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// source gets the 'end' or 'close' events. Only dest.end() once.
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if (!dest._isStdio && (!options || options.end !== false)) {
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source.on("end", onend);
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source.on("close", onclose);
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}
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let didOnEnd = false;
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function onend() {
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if (didOnEnd) return;
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didOnEnd = true;
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dest.end();
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}
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function onclose() {
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if (didOnEnd) return;
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didOnEnd = true;
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if (typeof dest.destroy === "function") dest.destroy();
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}
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// Don't leave dangling pipes when there are errors.
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function onerror(er) {
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cleanup();
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if (EE.listenerCount(this, "error") === 0) {
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this.emit("error", er);
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}
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}
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prependListener(source, "error", onerror);
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prependListener(dest, "error", onerror);
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// Remove all the event listeners that were added.
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function cleanup() {
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source.removeListener("data", ondata);
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dest.removeListener("drain", ondrain);
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source.removeListener("end", onend);
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source.removeListener("close", onclose);
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source.removeListener("error", onerror);
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dest.removeListener("error", onerror);
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source.removeListener("end", cleanup);
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source.removeListener("close", cleanup);
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dest.removeListener("close", cleanup);
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}
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source.on("end", cleanup);
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source.on("close", cleanup);
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dest.on("close", cleanup);
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dest.emit("pipe", source);
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// Allow for unix-like usage: A.pipe(B).pipe(C)
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return dest;
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};
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function prependListener(emitter, event, fn) {
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// Sadly this is not cacheable as some libraries bundle their own
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// event emitter implementation with them.
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if (typeof emitter.prependListener === "function") {
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return emitter.prependListener(event, fn);
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}
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// This is a hack to make sure that our error handler is attached before any
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// userland ones. NEVER DO THIS. This is here only because this code needs
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// to continue to work with older versions of Node.js that do not include
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// the prependListener() method. The goal is to eventually remove this hack.
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if (!emitter._events || !emitter._events[event]) {
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emitter.on(event, fn);
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} else if (Array.isArray(emitter._events[event])) {
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emitter._events[event].unshift(fn);
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} else {
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emitter._events[event] = [fn, emitter._events[event]];
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}
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}
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export { prependListener, Stream };
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