diff --git a/dist/js-yaml.js b/dist/js-yaml.js
index df93be39..0c9e648b 100644
--- a/dist/js-yaml.js
+++ b/dist/js-yaml.js
@@ -1,4 +1,4 @@
-/* js-yaml 3.11.0 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function(){function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}return e})()({1:[function(require,module,exports){
+/* js-yaml 3.12.0 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 'use strict';
 
 
@@ -337,6 +337,12 @@ function isPlainSafeFirst(c) {
     && c !== CHAR_GRAVE_ACCENT;
 }
 
+// Determines whether block indentation indicator is required.
+function needIndentIndicator(string) {
+  var leadingSpaceRe = /^\n* /;
+  return leadingSpaceRe.test(string);
+}
+
 var STYLE_PLAIN   = 1,
     STYLE_SINGLE  = 2,
     STYLE_LITERAL = 3,
@@ -404,7 +410,7 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
       ? STYLE_PLAIN : STYLE_SINGLE;
   }
   // Edge case: block indentation indicator can only have one digit.
-  if (string[0] === ' ' && indentPerLevel > 9) {
+  if (indentPerLevel > 9 && needIndentIndicator(string)) {
     return STYLE_DOUBLE;
   }
   // At this point we know block styles are valid.
@@ -468,7 +474,7 @@ function writeScalar(state, string, level, iskey) {
 
 // Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
 function blockHeader(string, indentPerLevel) {
-  var indentIndicator = (string[0] === ' ') ? String(indentPerLevel) : '';
+  var indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : '';
 
   // note the special case: the string '\n' counts as a "trailing" empty line.
   var clip =          string[string.length - 1] === '\n';
@@ -3478,8 +3484,14 @@ function constructJavascriptFunction(data) {
 
   // Esprima's ranges include the first '{' and the last '}' characters on
   // function expressions. So cut them out.
+  if (ast.body[0].expression.body.type === 'BlockStatement') {
+    /*eslint-disable no-new-func*/
+    return new Function(params, source.slice(body[0] + 1, body[1] - 1));
+  }
+  // ES6 arrow functions can omit the BlockStatement. In that case, just return
+  // the body.
   /*eslint-disable no-new-func*/
-  return new Function(params, source.slice(body[0] + 1, body[1] - 1));
+  return new Function(params, 'return ' + source.slice(body[0], body[1]));
 }
 
 function representJavascriptFunction(object /*, style*/) {
@@ -3902,4 +3914,4 @@ var yaml = require('./lib/js-yaml.js');
 module.exports = yaml;
 
 },{"./lib/js-yaml.js":1}]},{},[])("/")
-});
\ No newline at end of file
+});
diff --git a/dist/js-yaml.min.js b/dist/js-yaml.min.js
index 7ca01842..0dcb7bac 100644
--- a/dist/js-yaml.min.js
+++ b/dist/js-yaml.min.js
@@ -1 +1 @@
-!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).jsyaml=e()}}(function(){return function o(a,s,c){function u(n,e){if(!s[n]){if(!a[n]){var t="function"==typeof require&&require;if(!e&&t)return t(n,!0);if(l)return l(n,!0);var i=new Error("Cannot find module '"+n+"'");throw i.code="MODULE_NOT_FOUND",i}var r=s[n]={exports:{}};a[n][0].call(r.exports,function(e){var t=a[n][1][e];return u(t||e)},r,r.exports,o,a,s,c)}return s[n].exports}for(var l="function"==typeof require&&require,e=0;e<c.length;e++)u(c[e]);return u}({1:[function(e,t,n){"use strict";var i=e("./js-yaml/loader"),r=e("./js-yaml/dumper");function o(e){return function(){throw new Error("Function "+e+" is deprecated and cannot be 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strict";function i(e){return null==e}t.exports.isNothing=i,t.exports.isObject=function(e){return"object"==typeof e&&null!==e},t.exports.toArray=function(e){return Array.isArray(e)?e:i(e)?[]:[e]},t.exports.repeat=function(e,t){var n,i="";for(n=0;n<t;n+=1)i+=e;return i},t.exports.isNegativeZero=function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},t.exports.extend=function(e,t){var n,i,r,o;if(t)for(n=0,i=(o=Object.keys(t)).length;n<i;n+=1)e[r=o[n]]=t[r];return e}},{}],3:[function(e,t,n){"use strict";var c=e("./common"),d=e("./exception"),i=e("./schema/default_full"),r=e("./schema/default_safe"),l=Object.prototype.toString,u=Object.prototype.hasOwnProperty,o=9,h=10,a=32,m=33,g=34,y=35,x=37,v=38,A=39,b=42,w=44,C=45,k=58,j=62,S=63,I=64,E=91,O=93,F=96,_=123,N=124,M=125,s={0:"\\0",7:"\\a",8:"\\b",9:"\\t",10:"\\n",11:"\\v",12:"\\f",13:"\\r",27:"\\e",34:'\\"',92:"\\\\",133:"\\N",160:"\\_",8232:"\\L",8233:"\\P"},p=["y","Y","yes","Yes","YES","on","On","ON","n","N","no","No","NO","off","Off","OFF"];function f(e){var t,n,i;if(t=e.toString(16).toUpperCase(),e<=255)n="x",i=2;else if(e<=65535)n="u",i=4;else{if(!(e<=4294967295))throw new d("code point within a string may not be greater than 0xFFFFFFFF");n="U",i=8}return"\\"+n+c.repeat("0",i-t.length)+t}function T(e){this.schema=e.schema||i,this.indent=Math.max(1,e.indent||2),this.skipInvalid=e.skipInvalid||!1,this.flowLevel=c.isNothing(e.flowLevel)?-1:e.flowLevel,this.styleMap=function(e,t){var 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