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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including @sounisi5011/stream-transform-from. Try it out:
const stream = require('stream');
const { transformFrom } = require('@sounisi5011/stream-transform-from');
stream.pipeline(
stream.Readable.from([1, 2, 3, 4, 5]),
// Convert a number to a Buffer object.
transformFrom(
async function*(source) {
for await (const { chunk: inputChunk } of source) {
console.log({ inputChunk });
if (typeof inputChunk === 'number') {
const code = inputChunk;
yield Buffer.from([code]);
}
}
},
{ writableObjectMode: true },
),
// Transform a Buffer object.
transformFrom(async function*(source) {
for await (const { chunk } of source) {
yield Buffer.concat([
Buffer.from([0xF0]),
chunk,
Buffer.from([0xFF]),
]);
}
}),
new stream.Writable({
write(outputChunk, _, done) {
console.log({ outputChunk });
done();
},
}),
error => {
if (error) {
console.error(error);
} else {
console.log('done!');
}
},
);
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