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fs: deprecate fs.read's string interface #4525

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fs: deprecate fs.read's string interface #4525

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11 changes: 11 additions & 0 deletions lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ const isWindows = process.platform === 'win32';

const DEBUG = process.env.NODE_DEBUG && /fs/.test(process.env.NODE_DEBUG);
const errnoException = util._errnoException;
const printDeprecation = require('internal/util').printDeprecationMessage;

function throwOptionsError(options) {
throw new TypeError('Expected options to be either an object or a string, ' +
Expand Down Expand Up @@ -584,9 +585,14 @@ fs.openSync = function(path, flags, mode) {
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
};

var readWarned = false;
fs.read = function(fd, buffer, offset, length, position, callback) {
if (!(buffer instanceof Buffer)) {
// legacy string interface (fd, length, position, encoding, callback)
readWarned = printDeprecation('fs.read\'s legacy String interface ' +
'is deprecated. Use the Buffer API as ' +
'mentioned in the documentation instead.',
readWarned);
const cb = arguments[4];
const encoding = arguments[3];

Expand Down Expand Up @@ -636,12 +642,17 @@ function tryToStringWithEnd(buf, encoding, end, callback) {
callback(e, buf, end);
}

var readSyncWarned = false;
fs.readSync = function(fd, buffer, offset, length, position) {
var legacy = false;
var encoding;

if (!(buffer instanceof Buffer)) {
// legacy string interface (fd, length, position, encoding, callback)
readSyncWarned = printDeprecation('fs.readSync\'s legacy String interface' +
'is deprecated. Use the Buffer API as ' +
'mentioned in the documentation instead.',
readSyncWarned);
legacy = true;
encoding = arguments[3];

Expand Down