handlebars.runtime.js in handlebars-source-4.3.0 vs handlebars.runtime.js in handlebars-source-4.3.1

@@ -1,9 +1,9 @@
 /**!
 
  @license
- handlebars v4.3.0
+ handlebars v4.3.1
 
 Copyright (C) 2011-2017 by Yehuda Katz
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -205,15 +205,17 @@
 
 	var _logger = __webpack_require__(19);
 
 	var _logger2 = _interopRequireDefault(_logger);
 
-	var VERSION = '4.3.0';
+	var VERSION = '4.3.1';
 	exports.VERSION = VERSION;
 	var COMPILER_REVISION = 8;
-
 	exports.COMPILER_REVISION = COMPILER_REVISION;
+	var LAST_COMPATIBLE_COMPILER_REVISION = 7;
+
+	exports.LAST_COMPATIBLE_COMPILER_REVISION = LAST_COMPATIBLE_COMPILER_REVISION;
 	var REVISION_CHANGES = {
 	  1: '<= 1.0.rc.2', // 1.0.rc.2 is actually rev2 but doesn't report it
 	  2: '== 1.0.0-rc.3',
 	  3: '== 1.0.0-rc.4',
 	  4: '== 1.x.x',
@@ -1017,20 +1019,22 @@
 
 	function checkRevision(compilerInfo) {
 	  var compilerRevision = compilerInfo && compilerInfo[0] || 1,
 	      currentRevision = _base.COMPILER_REVISION;
 
-	  if (compilerRevision !== currentRevision) {
-	    if (compilerRevision < currentRevision) {
-	      var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
-	          compilerVersions = _base.REVISION_CHANGES[compilerRevision];
-	      throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
-	    } else {
-	      // Use the embedded version info since the runtime doesn't know about this revision yet
-	      throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
-	    }
+	  if (compilerRevision >= _base.LAST_COMPATIBLE_COMPILER_REVISION && compilerRevision <= _base.COMPILER_REVISION) {
+	    return;
 	  }
+
+	  if (compilerRevision < _base.LAST_COMPATIBLE_COMPILER_REVISION) {
+	    var runtimeVersions = _base.REVISION_CHANGES[currentRevision],
+	        compilerVersions = _base.REVISION_CHANGES[compilerRevision];
+	    throw new _exception2['default']('Template was precompiled with an older version of Handlebars than the current runtime. ' + 'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
+	  } else {
+	    // Use the embedded version info since the runtime doesn't know about this revision yet
+	    throw new _exception2['default']('Template was precompiled with a newer version of Handlebars than the current runtime. ' + 'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
+	  }
 	}
 
 	function template(templateSpec, env) {
 
 	  /* istanbul ignore next */
@@ -1045,10 +1049,13 @@
 
 	  // Note: Using env.VM references rather than local var references throughout this section to allow
 	  // for external users to override these as pseudo-supported APIs.
 	  env.VM.checkRevision(templateSpec.compiler);
 
+	  // backwards compatibility for precompiled templates with compiler-version 7 (<4.3.0)
+	  var templateWasPrecompiledWithCompilerV7 = templateSpec.compiler && templateSpec.compiler[0] === 7;
+
 	  function invokePartialWrapper(partial, context, options) {
 	    if (options.hash) {
 	      context = Utils.extend({}, context, options.hash);
 	      if (options.ids) {
 	        options.ids[0] = true;
@@ -1173,12 +1180,13 @@
 	      if (templateSpec.usePartial || templateSpec.useDecorators) {
 	        container.decorators = Utils.extend({}, env.decorators, options.decorators);
 	      }
 
 	      container.hooks = {};
-	      var keepHelper = options.allowCallsToHelperMissing;
-	      _helpers.moveHelperToHooks(container, 'helperMissing', keepHelper);
-	      _helpers.moveHelperToHooks(container, 'blockHelperMissing', keepHelper);
+
+	      var keepHelperInHelpers = options.allowCallsToHelperMissing || templateWasPrecompiledWithCompilerV7;
+	      _helpers.moveHelperToHooks(container, 'helperMissing', keepHelperInHelpers);
+	      _helpers.moveHelperToHooks(container, 'blockHelperMissing', keepHelperInHelpers);
 	    } else {
 	      container.helpers = options.helpers;
 	      container.partials = options.partials;
 	      container.decorators = options.decorators;
 	      container.hooks = options.hooks;
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