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buffer: add constants object

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Add `buffer.constants`, containing length limits for `Buffer` and
`string` instances.

This could be useful for programmers to tell whether a value can
be turned into a string or not.

Ref: https://github.com/nodejs/node/issues/13465
PR-URL: https://github.com/nodejs/node/pull/13467
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
This commit is contained in:
Anna Henningsen 2017-06-05 11:58:20 +02:00
parent 50d151578d
commit 1e2905f46a
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3 changed files with 85 additions and 12 deletions
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23
lib/buffer.js
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@ -42,8 +42,31 @@ Buffer.prototype = FastBuffer.prototype;
exports.Buffer = Buffer;
exports.SlowBuffer = SlowBuffer;
exports.INSPECT_MAX_BYTES = 50;
// Legacy.
exports.kMaxLength = binding.kMaxLength;
const constants = Object.defineProperties({}, {
MAX_LENGTH: {
value: binding.kStringMaxLength,
writable: false,
enumerable: true
},
MAX_STRING_LENGTH: {
value: binding.kStringMaxLength,
writable: false,
enumerable: true
}
});
Object.defineProperty(exports, 'constants', {
configurable: false,
enumerable: true,
value: constants
});
exports.kStringMaxLength = binding.kStringMaxLength;
const kFromErrorMsg = 'First argument must be a string, Buffer, ' +
'ArrayBuffer, Array, or array-like object.';