Is the size same as file statSync size

[brightchip]

I tried to read chunk by chunk and upload to remote server. but the final one seems exceed the file size

I'm using "read-chunk": "^3.2.0", because new version doesn't support require for which My project has to use it

firstChunk result {"d":{"StartUpload":"5242880"}}
uploading continue chunks 5242880 10485760 51387344

...
other chun result {"d":{"ContinueUpload":"47185920"}}
finished uplading... 47185920 52428800 51387344

   const stats = fs.statSync(path);
    const fileSizeInBytes = stats.size;
    console.log('fileSizeInBytes', fileSizeInBytes)

    for (offset = 0; offset < fileSizeInBytes; offset += chunkSize) {
        const chunk = await ReadChunk(path, offset, chunkSize);

        if (firstChunk) {
            console.log('uploading firstChunk', path, offset, offset + chunkSize, fileSizeInBytes)
       
        } else if (offset >= fileSizeInBytes - chunkSize) {
            console.log('finished uplading...', offset, offset + chunkSize, fileSizeInBytes)
        

        } else {
            console.log('uploading continue chunks', offset, offset + chunkSize, fileSizeInBytes)
    }

[sindresorhus]

This is most likely a logic bug in your code. However, I'm happy to take a closer look if you submit a failing tests.

[rawpixel-vincent]

for (offset = 0; offset < fileSizeInBytes; offset += chunkSize) {
         const limit = offset + chunkSize <= fileSizeInBytes ? chunkSize : fileSizeInBytes - offset;
        const chunk = await ReadChunk(path, offset, limit);

the last loop could go over the fileSizeInBytes.
what does read-chunk in that case ?

the test would be

const buf = Buffer.from('12345');
const chunk = await ReadChunk(buf, 0, 10);
should(chunk.length === 5);

[rawpixel-vincent]

mkdir -p test-issue19 && cd test-issue19 && rm -f test.mjs && echo "1" > test.txt && yarn add read-chunk && echo "import {readChunk} from 'read-chunk';(async function() {let length = (await readChunk('test.txt', {length: 1000, startPosition: 1})).length;console.log(length);})()" > test.mjs && node test.mjs && cd - => 1

mkdir -p test-issue19 && cd test-issue19 && rm -f test.mjs && echo "12" > test.txt && yarn add read-chunk && echo "import {readChunk} from 'read-chunk';(async function() {let length = (await readChunk('test.txt', {length: 1000, startPosition: 1})).length;console.log(length);})()" > test.mjs && node test.mjs && cd - => 2

mkdir -p test-issue19 && cd test-issue19 && rm -f test.mjs && echo "123" > test.txt && yarn add read-chunk && echo "import {readChunk} from 'read-chunk';(async function() {let length = (await readChunk('test.txt', {length: 2, startPosition: 1})).length;console.log(length);})()" > test.mjs && node test.mjs && cd - => 2

works fine

[rawpixel-vincent]

with 3.2.0
mkdir -p test-issue19 && cd test-issue19 && rm -f test.js && echo "1" > test.txt && yarn add read-chunk@3.2.0 && echo "const readChunk = require('read-chunk');(async function() {let length = (await readChunk('test.txt',1,1000)).length;console.log(length);})()" > test.js && node test.js && cd - => 1

mkdir -p test-issue19 && cd test-issue19 && rm -f test.js && echo "12" > test.txt && yarn add read-chunk@3.2.0 && echo "const readChunk = require('read-chunk');(async function() {let length = (await readChunk('test.txt',1,1000)).length;console.log(length);})()" > test.js && node test.js && cd - => 2

mkdir -p test-issue19 && cd test-issue19 && rm -f test.js && echo "123" > test.txt && yarn add read-chunk@3.2.0 && echo "const readChunk = require('read-chunk');(async function() {let length = (await readChunk('test.txt',1,2)).length;console.log(length);})()" > test.js && node test.js && cd - => 2

would need the input file used to test