next
Version:
The React Framework
76 lines (75 loc) • 2.39 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.ReadableStream = void 0;
class ReadableStream {
constructor(opts = {}){
let closed = false;
let pullPromise;
let transformController;
const { readable , writable } = new TransformStream({
start: (controller)=>{
transformController = controller;
}
}, undefined, {
highWaterMark: 1
});
const writer = writable.getWriter();
const encoder = new TextEncoder();
const controller1 = {
get desiredSize () {
return transformController.desiredSize;
},
close: ()=>{
if (!closed) {
closed = true;
writer.close();
}
},
enqueue: (chunk)=>{
writer.write(typeof chunk === 'string' ? encoder.encode(chunk) : chunk);
pull();
},
error: (reason)=>{
transformController.error(reason);
}
};
const pull = ()=>{
if (opts.pull) {
const shouldPull = controller1.desiredSize !== null && controller1.desiredSize > 0;
if (!pullPromise && shouldPull) {
pullPromise = Promise.resolve().then(()=>{
pullPromise = 0;
opts.pull(controller1);
});
return pullPromise;
}
}
return Promise.resolve();
};
if (opts.cancel) {
readable.cancel = (reason)=>{
opts.cancel(reason);
return readable.cancel(reason);
};
}
function registerPull() {
const getReader = readable.getReader.bind(readable);
readable.getReader = ()=>{
pull();
return getReader();
};
}
const started = opts.start && opts.start(controller1);
if (started && typeof started.then === 'function') {
started.then(()=>registerPull()
);
} else {
registerPull();
}
return readable;
}
}
exports.ReadableStream = ReadableStream;
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