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'use strict'; const common = require('../common'); const assert = require('assert'); const fs = require('fs'); const path = require('path'); const tmpdir = require('../common/tmpdir'); const tempFile = path.join(tmpdir.path, 'fs-non-number-arguments-throw'); tmpdir.refresh(); fs.writeFileSync(tempFile, 'abc\ndef'); // A sanity check when using numbers instead of strings const sanity = 'def'; const saneEmitter = fs.createReadStream(tempFile, { start: 4, end: 6 }); assert.throws( () => { fs.createReadStream(tempFile, { start: '4', end: 6 }); }, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' }); assert.throws( () => { fs.createReadStream(tempFile, { start: 4, end: '6' }); }, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' }); assert.throws( () => { fs.createWriteStream(tempFile, { start: '4' }); }, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' }); saneEmitter.on('data', common.mustCall(function(data) { assert.strictEqual( sanity, data.toString('utf8'), `read ${data.toString('utf8')} instead of ${sanity}`); }));