Baseline Widely available
pipeTo()
㯠ReadableStream
ã¤ã³ã¿ã¼ãã§ã¤ã¹ã®ã¡ã½ããã§ãç¾å¨ã® ReadableStream
ãä¸ãããã WritableStream
ã«ãã¤ãæ¥ç¶ãã¾ããè¿ããã Promise
ã¯ããã¤ãã®ããã»ã¹ãæ£å¸¸ã«å®äºããå ´åã¯å±¥è¡ãããã¨ã©ã¼ãçºçããå ´åã¯æå¦ããã¾ãã
ã¹ããªã¼ã ããã¤ãæ¥ç¶ããã¨ãéå¸¸ãæ¥ç¶ãã¦ããéã¯ã¹ããªã¼ã ãããã¯ãããä»ã®ãªã¼ãã¼ãããã¯ã§ããªããªãã¾ãã
æ§æpipeTo(destination)
pipeTo(destination, options)
弿°
destination
ReadableStream
ã®æçµçãªå®å
ã¨ãã¦æ©è½ãã WritableStream
ã
options
çç¥å¯
writable
ã¹ããªã¼ã ã«ãã¤ãæ¥ç¶ããã¨ãã«ä½¿ç¨ãããªãã·ã§ã³ã§ãã å©ç¨ã§ãããªãã·ã§ã³ã¯ä»¥ä¸ã®éãã§ãã
preventClose
ããã true
ã«è¨å®ããã¨ãå
¥åå
ã® ReadableStream
ãéãããã¦ããåºåå
ã® WritableStream
ãéãããããã¨ã¯ãªããªãã¾ãã ãã®ã¡ã½ããã¯ããã®å¦çãå®å
¨ã«çµäºããã¨å±¥è¡ããããããã¹ãè¿ãã¾ãããã ããåºåå
ãéããéã«ã¨ã©ã¼ãçºçããå ´åã¯ããã®ã¨ã©ã¼ã§æå¦ããã¾ãã
preventAbort
ãã®å¤ã true
ã«è¨å®ããã¨ãå
¥åå
ã® ReadableStream
ã§ã¨ã©ã¼ãçºçãã¦ããåºåå
ã® WritableStream
ã䏿ããããã¨ããªããªãã¾ãã ãã®ã¡ã½ããã¯ãåºåå
ã®ã¨ã©ã¼ãã¾ãã¯åºåå
ã䏿¢ããéã«çºçããã¨ã©ã¼ã§æå¦ããããããã¹ãè¿ãã¾ãã
preventCancel
ãã®å¤ã true
ã«è¨å®ããã¨ãåºåå
ã® WritableStream
ã§ã¨ã©ã¼ãçºçãã¦ããå
¥åå
ã® ReadableStream
ãåãæ¶ããã¨ãã§ããªããªãã¾ãã ãã®å ´åãã¡ã½ããã¯ãå
¥åå
ã®ã¨ã©ã¼ãã¾ãã¯å
¥åå
ãåãæ¶ãéã«çºçããã¨ã©ã¼ã§æå¦ããããããã¹ãè¿ãã¾ãã ã¾ããåºåå
ã®æ¸ãè¾¼ã¿å¯è½ãªã¹ããªã¼ã ãéãããããéå§ããããããå ´åãå
¥åå
ã®èªã¿åãå¯è½ãªã¹ããªã¼ã ã¯åãæ¶ãããªããªãã¾ãã ãã®å ´åãã¡ã½ããã¯ãéããããã¹ããªã¼ã ã¸ã®ãã¤ãå¦çã«å¤±æãããã¨ã示ãã¨ã©ã¼ãã¾ãã¯å
¥åå
ãåãæ¶ãéã«çºçããã¨ã©ã¼ã¨ã¨ãã«ãæå¦ããããããã¹ãè¿ãã¾ãã
signal
AbortSignal
ãªãã¸ã§ã¯ããè¨å®ããã¨ãé²è¡ä¸ã®ãã¤ãæä½ã対å¿ãã AbortController
ãã䏿¢ã§ãã¾ãã
ãã¤ãã®ããã»ã¹ãå®äºããã¨ãã«è§£æ±ºãã Promise
ã§ãã
TypeError
writableStream
ã readableStream
ãªãã¸ã§ã¯ãã¯ãæ¸ãè¾¼ã¿å¯è½ãªã¹ããªã¼ã /èªã¿åãå¯è½ãªã¹ããªã¼ã ã§ã¯ãªãããã¹ããªã¼ã ã®ä¸æ¹ã¾ãã¯ä¸¡æ¹ãããã¯ããã¦ãã¾ãã
// å
ã®ç»åãèªã¿åã
fetch("png-logo.png")
// ãã® body ã ReadableStream ã¨ãã¦åå¾
.then((response) => response.body)
.then((body) => body.pipeThrough(new PNGTransformStream()))
.then((rs) => rs.pipeTo(new FinalDestinationStream()));
åãä¾ã§ await
使ç¨ããã¨æ¬¡ã®ããã«ãªãã¾ãã
(async () => {
// å
ã®ç»åãèªã¿åã
const response = await fetch("png-logo.png");
// ãã® body ã ReadableStream ã¨ãã¦åå¾
response.body
.pipeThrough(new PNGTransformStream())
.pipeTo(new FinalDestinationStream());
})();
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