v4.7.14

Addresses #1033.

CHANGELOG.md

@@ -13,6 +13,54 @@ _Note: Gaps between patch versions are faulty/broken releases._
 
 See [CHANGELOG - 6to5](CHANGELOG-6to5.md) for the pre-4.0.0 version changelog.
 
+## 4.7.14
+
+ * **Bug Fix**
+  * Fix constructor spreading of `Promise`.
+ * **Internal**
+  * Deprecate remaining playground transformers and abstract references.
+
+## 4.7.13
+
+ * **Bug Fix**
+  * Handle comments on use strict directives.
+  * Fix assignment patterns with a left side pattern.
+ * **Polish**
+  * Special case `this` when doing expression memoisation.
+
+## 4.7.12
+
+ * **Bug Fix**
+  * Deprecate `playground.methodBinding`.
+
+## 4.7.11
+
+ * **Bug Fix**
+  * Fix unicode regexes stripping their unicode flag before being passed on two `regexpu`.
+
+## 4.7.10
+
+ * **Internal**
+  * Deprecate `playground.methodBinding` and `playground.objectGetterMemoization`.
+ * **Bug Fix**
+  * Fix `inputSourceMap` option. Thanks [@Rich-Harris](https://github.com/Rich-Harris)!
+
+## 4.7.9
+
+ * **Polish**
+  * Allow `inputSourceMap` to be set to `false` to skip the source map inference.
+  * Infer computed literal property names.
+ * **Bug Fix**
+  * Fix nested labeled for-ofs.
+  * Fix block scoping `break` colliding with the parent switch case.
+ * **Internal**
+  * Upgrade `acorn-babel`.
+
+## 4.7.8
+
+ * **Bug Fix**
+  * Fix computed classes not properly setting symbols.
+
 ## 4.7.7
 
  * **Bug Fix**

bin/babel-node

@@ -36,16 +36,380 @@ babelArgs.forEach(function(arg){
       args.unshift("--expose-gc");
       break;
 
-    case "--gc-global":
+    case "--use_strict":
+    case "--es_staging":
     case "--harmony":
-    case "--harmony-proxies":
-    case "--harmony-collections":
-    case "--harmony-generators":
-    case "--no-deprecation":
+    case "--harmony_shipping":
+    case "--harmony_modules":
+    case "--harmony_arrays":
+    case "--harmony_array_includes":
+    case "--harmony_regexps":
+    case "--harmony_arrow_functions":
+    case "--harmony_proxies":
+    case "--harmony_sloppy":
+    case "--harmony_unicode":
+    case "--harmony_tostring":
+    case "--harmony_numeric_literals":
+    case "--harmony_strings":
+    case "--harmony_scoping":
+    case "--harmony_classes":
+    case "--harmony_object_literals":
+    case "--harmony_templates":
+    case "--compiled_keyed_generic_loads":
+    case "--pretenuring_call_new":
+    case "--allocation_site_pretenuring":
+    case "--trace_pretenuring":
+    case "--trace_pretenuring_statistics":
+    case "--track_fields":
+    case "--track_double_fields":
+    case "--track_heap_object_fields":
+    case "--track_computed_fields":
+    case "--track_field_types":
+    case "--smi_binop":
+    case "--vector_ics":
+    case "--optimize_for_size":
+    case "--unbox_double_arrays":
+    case "--string_slices":
+    case "--crankshaft":
+    case "--hydrogen_filter":
+    case "--use_gvn":
+    case "--gvn_iterations":
+    case "--use_canonicalizing":
+    case "--use_inlining":
+    case "--use_escape_analysis":
+    case "--use_allocation_folding":
+    case "--use_local_allocation_folding":
+    case "--use_write_barrier_elimination":
+    case "--max_inlining_levels":
+    case "--max_inlined_source_size":
+    case "--max_inlined_nodes":
+    case "--max_inlined_nodes_cumulative":
+    case "--loop_invariant_code_motion":
+    case "--fast_math":
+    case "--collect_megamorphic_maps_from_stub_cache":
+    case "--hydrogen_stats":
+    case "--trace_check_elimination":
+    case "--trace_hydrogen":
+    case "--trace_hydrogen_filter":
+    case "--trace_hydrogen_stubs":
+    case "--trace_hydrogen_file":
+    case "--trace_phase":
+    case "--trace_inlining":
+    case "--trace_load_elimination":
+    case "--trace_store_elimination":
+    case "--trace_alloc":
+    case "--trace_all_uses":
+    case "--trace_range":
+    case "--trace_gvn":
+    case "--trace_representation":
+    case "--trace_removable_simulates":
+    case "--trace_escape_analysis":
+    case "--trace_allocation_folding":
+    case "--trace_track_allocation_sites":
+    case "--trace_migration":
+    case "--trace_generalization":
+    case "--stress_pointer_maps":
+    case "--stress_environments":
+    case "--deopt_every_n_times":
+    case "--deopt_every_n_garbage_collections":
+    case "--print_deopt_stress":
+    case "--trap_on_deopt":
+    case "--trap_on_stub_deopt":
+    case "--deoptimize_uncommon_cases":
+    case "--polymorphic_inlining":
+    case "--use_osr":
+    case "--array_bounds_checks_elimination":
+    case "--trace_bce":
+    case "--array_bounds_checks_hoisting":
+    case "--array_index_dehoisting":
+    case "--analyze_environment_liveness":
+    case "--load_elimination":
+    case "--check_elimination":
+    case "--store_elimination":
+    case "--dead_code_elimination":
+    case "--fold_constants":
+    case "--trace_dead_code_elimination":
+    case "--unreachable_code_elimination":
+    case "--trace_osr":
+    case "--stress_runs":
+    case "--lookup_sample_by_shared":
+    case "--cache_optimized_code":
+    case "--flush_optimized_code_cache":
+    case "--inline_construct":
+    case "--inline_arguments":
+    case "--inline_accessors":
+    case "--escape_analysis_iterations":
+    case "--optimize_for_in":
+    case "--concurrent_recompilation":
+    case "--job_based_recompilation":
+    case "--trace_concurrent_recompilation":
+    case "--concurrent_recompilation_queue_length":
+    case "--concurrent_recompilation_delay":
+    case "--block_concurrent_recompilation":
+    case "--concurrent_osr":
+    case "--omit_map_checks_for_leaf_maps":
+    case "--turbo_filter":
+    case "--trace_turbo":
+    case "--trace_turbo_graph":
+    case "--trace_turbo_cfg_file":
+    case "--trace_turbo_types":
+    case "--trace_turbo_scheduler":
+    case "--trace_turbo_reduction":
+    case "--trace_turbo_jt":
+    case "--turbo_asm":
+    case "--turbo_verify":
+    case "--turbo_stats":
+    case "--turbo_types":
+    case "--turbo_source_positions":
+    case "--context_specialization":
+    case "--turbo_deoptimization":
+    case "--turbo_inlining":
+    case "--turbo_inlining_intrinsics":
+    case "--trace_turbo_inlining":
+    case "--loop_assignment_analysis":
+    case "--turbo_profiling":
+    case "--turbo_reuse_spill_slots":
+    case "--turbo_delay_ssa_decon":
+    case "--turbo_move_optimization":
+    case "--turbo_jt":
+    case "--typed_array_max_size_in_heap":
+    case "--frame_count":
+    case "--interrupt_budget":
+    case "--type_info_threshold":
+    case "--generic_ic_threshold":
+    case "--self_opt_count":
+    case "--trace_opt_verbose":
+    case "--debug_code":
+    case "--code_comments":
+    case "--enable_sse3":
+    case "--enable_sse4_1":
+    case "--enable_sahf":
+    case "--enable_avx":
+    case "--enable_fma3":
+    case "--enable_vfp3":
+    case "--enable_armv7":
+    case "--enable_armv8":
+    case "--enable_neon":
+    case "--enable_sudiv":
+    case "--enable_mls":
+    case "--enable_movw_movt":
+    case "--enable_unaligned_accesses":
+    case "--enable_32dregs":
+    case "--enable_vldr_imm":
+    case "--force_long_branches":
+    case "--expose_natives_as":
+    case "--expose_debug_as":
+    case "--expose_free_buffer":
+    case "--expose_gc":
+    case "--expose_gc_as":
+    case "--expose_externalize_string":
+    case "--expose_trigger_failure":
+    case "--stack_trace_limit":
+    case "--builtins_in_stack_traces":
+    case "--disable_native_files":
+    case "--inline_new":
+    case "--trace_codegen":
+    case "--trace":
+    case "--mask_constants_with_cookie":
+    case "--lazy":
+    case "--trace_opt":
+    case "--trace_opt_stats":
+    case "--opt":
+    case "--always_opt":
+    case "--always_osr":
+    case "--prepare_always_opt":
+    case "--trace_deopt":
+    case "--trace_stub_failures":
+    case "--serialize_toplevel":
+    case "--serialize_inner":
+    case "--trace_serializer":
+    case "--min_preparse_length":
+    case "--max_opt_count":
+    case "--compilation_cache":
+    case "--cache_prototype_transitions":
+    case "--cpu_profiler_sampling_interval":
+    case "--trace_debug_json":
+    case "--trace_js_array_abuse":
+    case "--trace_external_array_abuse":
+    case "--trace_array_abuse":
+    case "--enable_liveedit":
+    case "--hard_abort":
+    case "--stack_size":
+    case "--max_stack_trace_source_length":
+    case "--always_inline_smi_code":
+    case "--min_semi_space_size":
+    case "--target_semi_space_size":
+    case "--max_semi_space_size":
+    case "--semi_space_growth_factor":
+    case "--experimental_new_space_growth_heuristic":
+    case "--max_old_space_size":
+    case "--initial_old_space_size":
+    case "--max_executable_size":
+    case "--gc_global":
+    case "--gc_interval":
+    case "--trace_gc":
+    case "--trace_gc_nvp":
+    case "--trace_gc_ignore_scavenger":
+    case "--trace_idle_notification":
+    case "--trace_idle_notification_verbose":
+    case "--print_cumulative_gc_stat":
+    case "--print_max_heap_committed":
+    case "--trace_gc_verbose":
+    case "--trace_fragmentation":
+    case "--collect_maps":
+    case "--weak_embedded_maps_in_optimized_code":
+    case "--weak_embedded_objects_in_optimized_code":
+    case "--flush_code":
+    case "--flush_code_incrementally":
+    case "--trace_code_flushing":
+    case "--age_code":
+    case "--incremental_marking":
+    case "--incremental_marking_steps":
+    case "--concurrent_sweeping":
+    case "--trace_incremental_marking":
+    case "--track_gc_object_stats":
+    case "--heap_profiler_trace_objects":
+    case "--use_idle_notification":
+    case "--use_ic":
+    case "--trace_ic":
+    case "--native_code_counters":
+    case "--always_compact":
+    case "--never_compact":
+    case "--compact_code_space":
+    case "--incremental_code_compaction":
+    case "--cleanup_code_caches_at_gc":
+    case "--use_marking_progress_bar":
+    case "--zap_code_space":
+    case "--random_seed":
+    case "--trace_weak_arrays":
+    case "--track_prototype_users":
+    case "--use_verbose_printer":
+    case "--allow_natives_syntax":
+    case "--trace_parse":
+    case "--trace_sim":
+    case "--debug_sim":
+    case "--check_icache":
+    case "--stop_sim_at":
+    case "--sim_stack_alignment":
+    case "--sim_stack_size":
+    case "--log_regs_modified":
+    case "--log_colour":
+    case "--ignore_asm_unimplemented_break":
+    case "--trace_sim_messages":
+    case "--stack_trace_on_illegal":
+    case "--abort_on_uncaught_exception":
+    case "--randomize_hashes":
+    case "--hash_seed":
+    case "--profile_deserialization":
+    case "--regexp_optimization":
+    case "--testing_bool_flag":
+    case "--testing_maybe_bool_flag":
+    case "--testing_int_flag":
+    case "--testing_float_flag":
+    case "--testing_string_flag":
+    case "--testing_prng_seed":
+    case "--testing_serialization_file":
+    case "--startup_blob":
+    case "--profile_hydrogen_code_stub_compilation":
+    case "--predictable":
+    case "--help":
+    case "--dump_counters":
+    case "--debugger":
+    case "--map_counters":
+    case "--js_arguments":
+    case "--gdbjit":
+    case "--gdbjit_full":
+    case "--gdbjit_dump":
+    case "--gdbjit_dump_filter":
+    case "--force_marking_deque_overflows":
+    case "--stress_compaction":
+    case "--log":
+    case "--log_all":
+    case "--log_api":
+    case "--log_code":
+    case "--log_gc":
+    case "--log_handles":
+    case "--log_snapshot_positions":
+    case "--log_suspect":
     case "--prof":
-    case "--throw-deprecation":
-    case "--trace-deprecation":
-    case "--use-strict":
+    case "--prof_browser_mode":
+    case "--log_regexp":
+    case "--logfile":
+    case "--logfile_per_isolate":
+    case "--ll_prof":
+    case "--perf_basic_prof":
+    case "--perf_jit_prof":
+    case "--gc_fake_mmap":
+    case "--log_internal_timer_events":
+    case "--log_timer_events":
+    case "--log_instruction_stats":
+    case "--log_instruction_file":
+    case "--log_instruction_period":
+    case "--redirect_code_traces":
+    case "--redirect_code_traces_to":
+    case "--hydrogen_track_positions":
+    case "--trace_elements_transitions":
+    case "--trace_creation_allocation_sites":
+    case "--print_code_stubs":
+    case "--test_secondary_stub_cache":
+    case "--test_primary_stub_cache":
+    case "--print_code":
+    case "--print_opt_code":
+    case "--print_unopt_code":
+    case "--print_code_verbose":
+    case "--print_builtin_code":
+    case "--sodium":
+    case "--print_all_code":
+    case "--es5_readonly":
+    case "--es52_globals":
+    case "--harmony_typeof":
+    case "--harmony_collections":
+    case "--packed_arrays":
+    case "--smi_only_arrays":
+    case "--clever_optimizations":
+    case "--use_range":
+    case "--eliminate_dead_phis":
+    case "--optimize_closures":
+    case "--loop_weight":
+    case "--opt_safe_uint32_operations":
+    case "--parallel_recompilation":
+    case "--trace_parallel_recompilation":
+    case "--parallel_recompilation_queue_length":
+    case "--experimental_profiler":
+    case "--watch_ic_patching":
+    case "--self_optimization":
+    case "--direct_self_opt":
+    case "--retry_self_opt":
+    case "--count_based_interrupts":
+    case "--interrupt_at_exit":
+    case "--weighted_back_edges":
+    case "--debug_code (generate extra code":
+    case "--enable_sse2":
+    case "--enable_cmov":
+    case "--enable_rdtsc":
+    case "--enable_vfp2":
+    case "--enable_fpu":
+    case "--stack_trace_on_abort":
+    case "--always_full_compiler":
+    case "--debugger_auto_break":
+    case "--break_on_abort":
+    case "--max_new_space_size":
+    case "--trace_external_memory":
+    case "--lazy_sweeping":
+    case "--trace_exception":
+    case "--preallocate_message_memory":
+    case "--preemption":
+    case "--extra_code":
+    case "--remote_debugger":
+    case "--debugger_agent":
+    case "--debugger_port":
+    case "--debug_compile_events":
+    case "--debug_script_collected_events":
+    case "--gdbjit":
+    case "--log_runtime":
+    case "--prof_auto":
+    case "--prof_lazy":
+    case "--sliding_state_window":
       args.unshift(arg);
       break;
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "4.7.8",
+  "version": "4.7.14",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://babeljs.io/",
   "repository": "babel/babel",
@@ -36,7 +36,7 @@
     "test": "make test"
   },
   "dependencies": {
-    "acorn-babel": "0.11.1-37",
+    "acorn-babel": "0.11.1-38",
     "ast-types": "~0.7.0",
     "chalk": "^1.0.0",
     "chokidar": "^0.12.6",

packages/babel-runtime/package.json

@@ -1,7 +1,7 @@
 {
   "name": "babel-runtime",
   "description": "babel selfContained runtime",
-  "version": "4.7.7",
+  "version": "4.7.13",
   "repository": "babel/babel",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "dependencies": {

src/babel/transformation/file.js

@@ -139,7 +139,7 @@ export default class File {
       returnUsedHelpers:      false,
       externalHelpers:        false,
       auxilaryComment:        "",
-      inputSourceMap:         false,
+      inputSourceMap:         null,
       experimental:           false,
       reactCompat:            false,
       playground:             false,
@@ -280,10 +280,12 @@ export default class File {
   parseInputSourceMap(code: string) {
     var opts = this.opts;
 
-    var inputMap = convertSourceMap.fromSource(code);
-    if (inputMap) {
-      opts.inputSourceMap = inputMap.toObject();
-      code = convertSourceMap.removeComments(code);
+    if (opts.inputSourceMap !== false) {
+      var inputMap = convertSourceMap.fromSource(code);
+      if (inputMap) {
+        opts.inputSourceMap = inputMap.toObject();
+        code = convertSourceMap.removeComments(code);
+      }
     }
 
     return code;

src/babel/transformation/helpers/name-method.js

@@ -111,7 +111,7 @@ export function bare(node, parent, scope) {
   if (node.id) return node;
 
   var id;
-  if (t.isProperty(parent) && parent.kind === "init" && !parent.computed) {
+  if (t.isProperty(parent) && parent.kind === "init" && (!parent.computed || t.isLiteral(parent.key))) {
     // { foo() {} };
     id = parent.key;
   } else if (t.isVariableDeclarator(parent)) {
@@ -121,9 +121,16 @@ export function bare(node, parent, scope) {
     return node;
   }
 
-  if (!t.isIdentifier(id)) return node;
+  var name;
+  if (t.isLiteral(id)) {
+    name = id.value;
+  } else if (t.isIdentifier(id)) {
+    name = id.name;
+  } else {
+    return;
+  }
 
-  var name = t.toIdentifier(id.name);
+  name = t.toIdentifier(name);
   id = t.identifier(name);
 
   var state = visit(node, name, scope);

src/babel/transformation/helpers/regex.js

@@ -7,7 +7,7 @@ export function is(node, flag) {
 
 export function pullFlag(node, flag) {
   var flags = node.regex.flags.split("");
-  if (node.regex.flags.indexOf("u") < 0) return;
-  pull(flags, "u");
+  if (node.regex.flags.indexOf(flag) < 0) return;
+  pull(flags, flag);
   node.regex.flags = flags.join("");
 }

src/babel/transformation/transformers/es6/block-scoping.js

@@ -69,8 +69,9 @@ export function Loop(node, parent, scope, file) {
     t.ensureBlock(node);
     node.body._letDeclarators = [init];
   }
-  var blockScoping = new BlockScoping(node, node.body, parent, scope, file);
-  blockScoping.run();
+
+  var blockScoping = new BlockScoping(this, node.body, parent, scope, file);
+  return blockScoping.run();
 }
 
 export function BlockStatement(block, parent, scope, file) {
@@ -224,17 +225,22 @@ class BlockScoping {
    * Description
    */
 
-  constructor(loopParent?: Object, block: Object, parent: Object, scope: Scope, file: File) {
-    this.loopParent = loopParent;
-    this.parent     = parent;
-    this.scope      = scope;
-    this.block      = block;
-    this.file       = file;
+  constructor(loopPath?: TraversalPath, block: Object, parent: Object, scope: Scope, file: File) {
+    this.parent = parent;
+    this.scope  = scope;
+    this.block  = block;
+    this.file   = file;
 
     this.outsideLetReferences = object();
     this.hasLetReferences     = false;
     this.letReferences        = block._letReferences = object();
     this.body                 = [];
+
+    if (loopPath) {
+      this.loopParent = loopPath.parent;
+      this.loopLabel  = t.isLabeledStatement(this.loopParent) && this.loopParent.label;
+      this.loop       = loopPath.node;
+    }
   }
 
   /**
@@ -259,6 +265,10 @@ class BlockScoping {
     } else {
       this.remap();
     }
+
+    if (this.loopLabel && !t.isLabeledStatement(this.loopParent)) {
+      return t.labeledStatement(this.loopLabel, this.loop);
+    }
   }
 
   /**
@@ -297,11 +307,11 @@ class BlockScoping {
 
     //
 
-    var loopParent = this.loopParent;
-    if (loopParent) {
-      traverseReplace(loopParent.right, loopParent, scope, remaps);
-      traverseReplace(loopParent.test, loopParent, scope, remaps);
-      traverseReplace(loopParent.update, loopParent, scope, remaps);
+    var loop = this.loop;
+    if (loop) {
+      traverseReplace(loop.right, loop, scope, remaps);
+      traverseReplace(loop.test, loop, scope, remaps);
+      traverseReplace(loop.update, loop, scope, remaps);
     }
 
     scope.traverse(this.block, replaceVisitor, remaps);
@@ -317,7 +327,7 @@ class BlockScoping {
     var outsideRefs = this.outsideLetReferences;
 
     // remap loop heads with colliding variables
-    if (this.loopParent) {
+    if (this.loop) {
       for (var name in outsideRefs) {
         var id = outsideRefs[name];
 
@@ -438,7 +448,7 @@ class BlockScoping {
       ignoreLabeless:   false,
       innerLabels:      [],
       hasReturn:        false,
-      isLoop:           !!this.loopParent,
+      isLoop:           !!this.loop,
       map:              {}
     };
 
@@ -504,7 +514,7 @@ class BlockScoping {
       t.variableDeclarator(ret, call)
     ]));
 
-    var loopParent = this.loopParent;
+    var loop = this.loop;
     var retCheck;
     var has = this.has;
     var cases = [];
@@ -517,9 +527,8 @@ class BlockScoping {
     }
 
     if (has.hasBreakContinue) {
-      if (!loopParent) {
-        throw new Error("Has no loop parent but we're trying to reassign breaks " +
-                        "and continues, something is going wrong here.");
+      if (!loop) {
+        throw new Error("Aren't in a loop and we're trying to reassign breaks and continues, something is going wrong here.");
       }
 
       for (var key in has.map) {
@@ -537,6 +546,14 @@ class BlockScoping {
           single.consequent[0]
         )));
       } else {
+        // #998
+        for (var i = 0; i < cases.length; i++) {
+          var caseConsequent = cases[i].consequent[0];
+          if (t.isBreakStatement(caseConsequent) && !caseConsequent.label) {
+            caseConsequent.label = this.loopLabel ||= this.file.scope.generateUidIdentifier("loop");
+          }
+        }
+
         body.push(this.file.attachAuxiliaryComment(t.switchStatement(ret, cases)));
       }
     } else {

src/babel/transformation/transformers/es6/destructuring.js

@@ -290,14 +290,21 @@ class DestructuringTransformer {
 
     //
 
-    this.nodes.push(this.buildVariableAssignment(
-      pattern.left,
-      t.conditionalExpression(
-        t.binaryExpression("===", tempValueRef, t.identifier("undefined")),
-        pattern.right,
-        tempValueRef
-      )
-    ));
+    var tempConditional = t.conditionalExpression(
+      t.binaryExpression("===", tempValueRef, t.identifier("undefined")),
+      pattern.right,
+      tempValueRef
+    );
+
+    var left = pattern.left;
+    if (t.isPattern(left)) {
+      this.nodes.push(t.expressionStatement(
+        t.assignmentExpression("=", tempValueRef, tempConditional)
+      ));
+      this.push(left, tempValueRef);
+    } else {
+      this.nodes.push(this.buildVariableAssignment(left, tempConditional));
+    }
   }
 
   pushObjectSpread(pattern, objRef, spreadProp, spreadPropIndex) {

src/babel/transformation/transformers/es6/for-of.js

@@ -32,11 +32,8 @@ export function ForOfStatement(node, parent, scope, file) {
   // todo: find out why this is necessary? #538
   loop._scopeInfo = node._scopeInfo;
 
-  if (build.replaceParent) {
-    this.parentPath.node = build.node;
-  } else {
-    return build.node;
-  }
+  if (build.replaceParent) this.parentPath.node = build.node;
+  return build.node;
 }
 
 var loose = function (node, parent, scope, file) {

src/babel/transformation/transformers/es6/regex.unicode.js

@@ -7,6 +7,6 @@ export function check(node) {
 
 export function Literal(node) {
   if (!regex.is(node, "u")) return;
-  regex.pullFlag(node, "y");
   node.regex.pattern = rewritePattern(node.regex.pattern, node.regex.flags);
+  regex.pullFlag(node, "u");
 }

src/babel/transformation/transformers/es7/abstract-references.js

@@ -24,6 +24,7 @@ var container = function (parent, call, ret, file) {
 export function AssignmentExpression(node, parent, scope, file) {
   var left = node.left;
   if (!t.isVirtualPropertyExpression(left)) return;
+  console.error("Abstract references are deprecated and will be removed in 5.0.0");
 
   var value = node.right;
   var temp;
@@ -65,6 +66,7 @@ export function UnaryExpression(node, parent, scope, file) {
   var arg = node.argument;
   if (!t.isVirtualPropertyExpression(arg)) return;
   if (node.operator !== "delete") return;
+  console.error("Abstract references are deprecated and will be removed in 5.0.0");
 
   var call = util.template("abstract-expression-delete", {
     PROPERTY: arg.property,
@@ -77,6 +79,7 @@ export function UnaryExpression(node, parent, scope, file) {
 export function CallExpression(node, parent, scope) {
   var callee = node.callee;
   if (!t.isVirtualPropertyExpression(callee)) return;
+  console.error("Abstract references are deprecated and will be removed in 5.0.0");
 
   var temp = scope.generateTempBasedOnNode(callee.object);
 
@@ -98,6 +101,7 @@ export function CallExpression(node, parent, scope) {
 }
 
 export function VirtualPropertyExpression(node) {
+  console.error("Abstract references are deprecated and will be removed in 5.0.0");
   return util.template("abstract-expression-get", {
     PROPERTY: node.property,
     OBJECT:   node.object
@@ -105,6 +109,7 @@ export function VirtualPropertyExpression(node) {
 }
 
 export function PrivateDeclaration(node) {
+  console.error("Abstract references are deprecated and will be removed in 5.0.0");
   return t.variableDeclaration("const", node.declarations.map(function (id) {
     return t.variableDeclarator(id, t.newExpression(t.identifier("WeakMap"), []));
   }));

src/babel/transformation/transformers/internal/strict.js

@@ -2,6 +2,17 @@ import * as t from "../../../types";
 
 export function Program(program, parent, scope, file) {
   if (file.transformers.strict.canRun()) {
-    program.body.unshift(t.expressionStatement(t.literal("use strict")));
+    var directive = file.get("existingStrictDirective");
+
+    if (!directive) {
+      directive = t.expressionStatement(t.literal("use strict"));
+      var first = program.body[0];
+      if (first) {
+        directive.leadingComments = first.leadingComments;
+        first.leadingComments = [];
+      }
+    }
+
+    program.body.unshift(directive);
   }
 }

src/babel/transformation/transformers/other/strict.js

@@ -1,10 +1,10 @@
 import * as messages from "../../../messages";
 import * as t from "../../../types";
 
-export function Program(program) {
+export function Program(program, parent, scope, file) {
   var first = program.body[0];
   if (t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" })) {
-    program.body.shift();
+    file.set("existingStrictDirective", program.body.shift());
   }
 }
 

src/babel/transformation/transformers/playground/mallet-operator.js

@@ -16,6 +16,7 @@ build(exports, {
   },
 
   build(node) {
+    console.error("The mallet operator is deprecated and will be removed in 5.0.0");
     return t.unaryExpression("!", node, true);
   }
 });

src/babel/transformation/transformers/playground/memoization-operator.js

@@ -11,6 +11,7 @@ build(exports, {
   },
 
   build(node, file) {
+    console.error("The memoization operator is deprecated and will be removed in 5.0.0");
     return t.unaryExpression(
       "!",
       t.callExpression(

src/babel/transformation/transformers/playground/method-binding.js

@@ -3,6 +3,8 @@ import * as t from "../../../types";
 export var playground = true;
 
 export function BindMemberExpression(node, parent, scope) {
+  console.error("Method binding is deprecated and will be removed in 5.0.0");
+
   var object = node.object;
   var prop   = node.property;
 
@@ -25,6 +27,8 @@ export function BindMemberExpression(node, parent, scope) {
 }
 
 export function BindFunctionExpression(node, parent, scope) {
+  console.error("Method binding is deprecated and will be removed in 5.0.0");
+
   var buildCall = function (args) {
     var param = scope.generateUidIdentifier("val");
     return t.functionExpression(null, [param], t.blockStatement([

src/babel/transformation/transformers/playground/object-getter-memoization.js

@@ -20,6 +20,8 @@ export function MethodDefinition(node, parent, scope, file) {
   if (node.kind !== "memo") return;
   node.kind = "get";
 
+  console.error("Object getter memoization is deprecated and will be removed in 5.0.0");
+
   var value = node.value;
   t.ensureBlock(value);
 

src/babel/traversal/scope.js

@@ -174,6 +174,10 @@ export default class Scope {
    */
 
   generateTempBasedOnNode(node: Object): ?Object {
+    if (t.isThisExpression(node)) {
+      return null;
+    }
+
     if (t.isIdentifier(node) && this.hasBinding(node.name)) {
       return null;
     }

src/babel/types/index.js

@@ -25,7 +25,7 @@ function registerType(type: string, skipAliasCheck?: boolean) {
 }
 
 export var STATEMENT_OR_BLOCK_KEYS = ["consequent", "body", "alternate"];
-export var NATIVE_TYPE_NAMES       = ["Array", "Object", "Number", "Boolean", "Date", "Array", "String"];
+export var NATIVE_TYPE_NAMES       = ["Array", "Object", "Number", "Boolean", "Date", "Array", "String", "Promise"];
 export var FLATTENABLE_KEYS        = ["body", "expressions"];
 export var FOR_INIT_KEYS           = ["left", "init"];
 export var COMMENT_KEYS            = ["leadingComments", "trailingComments"];

test/fixtures/transformation/es6-block-scoping/for-break-continue-return/expected.js

@@ -1,7 +1,7 @@
 "use strict";
 
 (function () {
-  for (var i in nums) {
+  _loop: for (var i in nums) {
     var _ret = (function (i) {
       fns.push(function () {
         return i;
@@ -22,7 +22,7 @@
         continue;
 
       case "break":
-        break;
+        break _loop;
 
       default:
         if (typeof _ret === "object") return _ret.v;

test/fixtures/transformation/es6-destructuring/array-unpack-optimisation/expected.js

@@ -1,6 +1,6 @@
+// opt
 "use strict";
 
-// opt
 var a = 1;
 var b = 2;
 var a = 1;

test/fixtures/transformation/es6-destructuring/assignment-expression-pattern/actual.js

@@ -0,0 +1,2 @@
+var z = {};
+var { x: { y } = {} } = z;

test/fixtures/transformation/es6-destructuring/assignment-expression-pattern/expected.js

@@ -0,0 +1,6 @@
+"use strict";
+
+var z = {};
+var _z$x = z.x;
+_z$x = _z$x === undefined ? {} : _z$x;
+var y = _z$x.y;

test/fixtures/transformation/es6-for-of/nested-label-for-of/actual.js

@@ -0,0 +1,5 @@
+b: for (let c of d()) {
+  for (let e of f()) {
+    continue b;
+  }
+}

test/fixtures/transformation/es6-for-of/nested-label-for-of/expected.js

@@ -0,0 +1,48 @@
+"use strict";
+
+var _iteratorNormalCompletion = true;
+var _didIteratorError = false;
+var _iteratorError = undefined;
+
+try {
+  b: for (var _iterator = d()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+    var c = _step.value;
+    var _iteratorNormalCompletion2 = true;
+    var _didIteratorError2 = false;
+    var _iteratorError2 = undefined;
+
+    try {
+      for (var _iterator2 = f()[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
+        var e = _step2.value;
+
+        continue b;
+      }
+    } catch (err) {
+      _didIteratorError2 = true;
+      _iteratorError2 = err;
+    } finally {
+      try {
+        if (!_iteratorNormalCompletion2 && _iterator2["return"]) {
+          _iterator2["return"]();
+        }
+      } finally {
+        if (_didIteratorError2) {
+          throw _iteratorError2;
+        }
+      }
+    }
+  }
+} catch (err) {
+  _didIteratorError = true;
+  _iteratorError = err;
+} finally {
+  try {
+    if (!_iteratorNormalCompletion && _iterator["return"]) {
+      _iterator["return"]();
+    }
+  } finally {
+    if (_didIteratorError) {
+      throw _iteratorError;
+    }
+  }
+}

test/fixtures/transformation/es6-regex.unicode/basic/expected.js

@@ -1,4 +1,4 @@
 "use strict";
 
 var string = "foo💩bar";
-var match = string.match(/foo((?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]))bar/);
+var match = string.match(/foo((?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]))bar/);

test/fixtures/transformation/es6-spread/this-context/actual.js

@@ -0,0 +1,6 @@
+var obj = {
+  foo: function foo() {
+    this.bar(...arguments)
+    this.blah(...arguments)
+  }
+}

test/fixtures/transformation/es6-spread/this-context/expected.js

@@ -0,0 +1,8 @@
+"use strict";
+
+var obj = {
+  foo: function foo() {
+    this.bar.apply(this, arguments);
+    this.blah.apply(this, arguments);
+  }
+};

test/fixtures/transformation/es6-tail-call/ignore-reassigned/expected.js

@@ -1,8 +1,8 @@
-"use strict";
-
 // we need to deopt `test` if it's reassigned as we can't be certain of it's
 // state, ie. it could have been rebound or dereferenced
 
+"use strict";
+
 function test(exit) {
   if (exit) {
     return this.x;

test/fixtures/transformation/strict/leading-comments-with-existing/actual.js

@@ -0,0 +1,4 @@
+// comments
+"use strict";
+
+module.exports = {};

test/fixtures/transformation/strict/leading-comments-with-existing/expected.js

@@ -0,0 +1,4 @@
+// comments
+"use strict";
+
+module.exports = {};

test/fixtures/transformation/strict/leading-comments/actual.js

@@ -0,0 +1,3 @@
+// comments
+
+module.exports = {};

test/fixtures/transformation/strict/leading-comments/expected.js

@@ -0,0 +1,5 @@
+// comments
+
+"use strict";
+
+module.exports = {};