Move TextLineStream to foxts, adopt `skipEmptyLines`

Build/lib/fetch-assets.ts

@@ -2,7 +2,7 @@ import picocolors from 'picocolors';
 import { $$fetch, defaultRequestInit, ResponseError } from './fetch-retry';
 import { waitWithAbort } from 'foxts/wait';
 import { nullthrow } from 'foxts/guard';
-import { TextLineStream } from './text-line-transform-stream';
+import { TextLineStream } from 'foxts/text-line-stream';
 import { ProcessLineStream } from './process-line';
 
 // eslint-disable-next-line sukka/unicorn/custom-error-definition -- typescript is better
@@ -32,7 +32,7 @@ export async function fetchAssets(url: string, fallbackUrls: null | undefined |
     }
     const res = await $$fetch(url, { signal: controller.signal, ...defaultRequestInit });
 
-    let stream = nullthrow(res.body, url + ' has an empty body').pipeThrough(new TextDecoderStream()).pipeThrough(new TextLineStream());
+    let stream = nullthrow(res.body, url + ' has an empty body').pipeThrough(new TextDecoderStream()).pipeThrough(new TextLineStream({ skipEmptyLines: processLine }));
     if (processLine) {
       stream = stream.pipeThrough(new ProcessLineStream());
     }

Build/lib/fetch-text-by-line.ts

@@ -1,7 +1,7 @@
 import fs from 'node:fs';
 import readline from 'node:readline';
 
-import { TextLineStream } from './text-line-transform-stream';
+import { TextLineStream } from 'foxts/text-line-stream';
 import type { ReadableStream } from 'node:stream/web';
 import { TextDecoderStream } from 'node:stream/web';
 import { processLine, ProcessLineStream } from './process-line';
@@ -31,7 +31,7 @@ export const createReadlineInterfaceFromResponse: ((resp: UndiciResponseData | U
 
   const resultStream = webStream
     .pipeThrough(new TextDecoderStream())
-    .pipeThrough(new TextLineStream());
+    .pipeThrough(new TextLineStream({ skipEmptyLines: processLine }));
 
   if (processLine) {
     return resultStream.pipeThrough(new ProcessLineStream());

Build/lib/text-line-transform-stream.ts

@@ -1,80 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-// This module is browser compatible.
-// Modified by Sukka (https://skk.moe) to increase compatibility and performance with Bun.
-
-import { TransformStream } from 'node:stream/web';
-
-interface TextLineStreamOptions {
-  /** Allow splitting by solo \r */
-  allowCR?: boolean
-}
-
-/** Transform a stream into a stream where each chunk is divided by a newline,
- * be it `\n` or `\r\n`. `\r` can be enabled via the `allowCR` option.
- *
- * ```ts
- * const res = await fetch('https://example.com');
- * const lines = res.body!
- *   .pipeThrough(new TextDecoderStream())
- *   .pipeThrough(new TextLineStream());
- * ```
- */
-export class TextLineStream extends TransformStream<string, string> {
-  // private __buf = '';
-  constructor({
-    allowCR = false
-  }: TextLineStreamOptions = {}) {
-    let __buf = '';
-    let chunkIndex = 0;
-
-    super({
-      transform(chunk, controller) {
-        chunk = __buf + chunk;
-        chunkIndex = 0;
-
-        for (; ;) {
-          const lfIndex = chunk.indexOf('\n', chunkIndex);
-
-          if (allowCR) {
-            const crIndex = chunk.indexOf('\r', chunkIndex);
-
-            if (
-              crIndex !== -1 && crIndex !== (chunk.length - 1)
-              && (lfIndex === -1 || (lfIndex - 1) > crIndex)
-            ) {
-              controller.enqueue(chunk.slice(chunkIndex, crIndex));
-              chunkIndex = crIndex + 1;
-              continue;
-            }
-          }
-
-          if (lfIndex === -1) {
-            // we can no longer find a line break in the chunk, break the current loop
-            break;
-          }
-
-          // enqueue current line, and loop again to find next line
-          let crOrLfIndex = lfIndex;
-          if (chunk[lfIndex - 1] === '\r') {
-            crOrLfIndex--;
-          }
-          controller.enqueue(chunk.slice(chunkIndex, crOrLfIndex));
-          chunkIndex = lfIndex + 1;
-          continue;
-        }
-
-        __buf = chunk.slice(chunkIndex);
-      },
-      flush(controller) {
-        if (__buf.length > 0) {
-          // eslint-disable-next-line sukka/string/prefer-string-starts-ends-with -- performance
-          if (allowCR && __buf[__buf.length - 1] === '\r') {
-            controller.enqueue(__buf.slice(0, -1));
-          } else {
-            controller.enqueue(__buf);
-          }
-        }
-      }
-    });
-  }
-}