diff --git a/js/js-export/__tests__/ast2blocklist.test.js b/js/js-export/__tests__/ast2blocklist.test.js
index 2b578d9455..4eec94048f 100644
--- a/js/js-export/__tests__/ast2blocklist.test.js
+++ b/js/js-export/__tests__/ast2blocklist.test.js
@@ -1563,4 +1563,37 @@ describe("AST2BlockList Class", () => {
         let blockList = AST2BlockList.toBlockList(AST, config);
         expect(blockList).toEqual(expectedBlockList);
     });
+
+    test("should generate heap blocks from JS", () => {
+        const code = `
+        new Mouse(async mouse => {
+            await mouse.print(mouse.HEAP);
+            await mouse.print(mouse.HEAPLENGTH);
+            await mouse.print(mouse.HEAPEMPTY);
+            await mouse.emptyHeap();
+            await mouse.reverseHeap();
+            await mouse.push(9);
+            await mouse.setHeapEntry(2, 5);
+            return mouse.ENDMOUSE;
+        });
+        MusicBlocks.run();`;
+
+        const AST = acorn.parse(code, { ecmaVersion: 2020 });
+        let blockList = AST2BlockList.toBlockList(AST, config);
+        const blockNames = blockList.map(block =>
+            Array.isArray(block[1]) ? block[1][0] : block[1]
+        );
+
+        expect(blockNames).toEqual(
+            expect.arrayContaining([
+                "heap",
+                "heapLength",
+                "heapEmpty",
+                "emptyHeap",
+                "reverseHeap",
+                "push",
+                "setHeapEntry"
+            ])
+        );
+    });
 });
diff --git a/js/js-export/__tests__/export.test.js b/js/js-export/__tests__/export.test.js
index 98b6a9fb97..5918b12242 100644
--- a/js/js-export/__tests__/export.test.js
+++ b/js/js-export/__tests__/export.test.js
@@ -47,6 +47,7 @@ const globalActivity = {
     logo: {
         prepSynths: jest.fn(),
         firstNoteTime: null,
+        turtleHeaps: {},
         stage: {
             removeEventListener: jest.fn()
         }
@@ -138,6 +139,7 @@ describe("MusicBlocks Class", () => {
             doWait: jest.fn(),
             container: { x: 10, y: 20 }
         });
+        globalActivity.turtles.getIndexOfTurtle.mockReturnValue(0);
         mouse = new Mouse(jest.fn());
         mouse.run = jest.fn();
         musicBlocks = new MusicBlocks(mouse);
@@ -236,6 +238,47 @@ describe("MusicBlocks Class", () => {
         expect(musicBlocks.GREY).toBe(75);
     });
 
+    describe("Heap helpers", () => {
+        test("should get HEAP as JSON string", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [1, 2, 3];
+            expect(musicBlocks.HEAP).toBe(JSON.stringify([1, 2, 3]));
+        });
+
+        test("should get HEAPLENGTH", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [1, 2, 3, 4];
+            expect(musicBlocks.HEAPLENGTH).toBe(4);
+        });
+
+        test("should get HEAPEMPTY when heap is missing", () => {
+            delete globalActivity.logo.turtleHeaps[musicBlocks.turIndex];
+            expect(musicBlocks.HEAPEMPTY).toBe(true);
+        });
+
+        test("should emptyHeap", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [1, 2];
+            musicBlocks.emptyHeap();
+            expect(globalActivity.logo.turtleHeaps[musicBlocks.turIndex]).toEqual([]);
+        });
+
+        test("should reverseHeap", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [1, 2, 3];
+            musicBlocks.reverseHeap();
+            expect(globalActivity.logo.turtleHeaps[musicBlocks.turIndex]).toEqual([3, 2, 1]);
+        });
+
+        test("should setHeapEntry", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [];
+            musicBlocks.setHeapEntry(2, 5);
+            expect(globalActivity.logo.turtleHeaps[musicBlocks.turIndex]).toEqual([0, 5]);
+        });
+
+        test("should push to heap", () => {
+            globalActivity.logo.turtleHeaps[musicBlocks.turIndex] = [1];
+            musicBlocks.push(2);
+            expect(globalActivity.logo.turtleHeaps[musicBlocks.turIndex]).toEqual([1, 2]);
+        });
+    });
+
     test("should get NOTEVALUE", () => {
         Singer.RhythmActions.getNoteValue.mockReturnValue(1);
         expect(musicBlocks.NOTEVALUE).toBe(1);
diff --git a/js/js-export/__tests__/interface.test.js b/js/js-export/__tests__/interface.test.js
index 525133febd..a7d6911a07 100644
--- a/js/js-export/__tests__/interface.test.js
+++ b/js/js-export/__tests__/interface.test.js
@@ -46,6 +46,10 @@ describe("JSInterface", () => {
             expect(JSInterface.isGetter("mynotevalue")).toBe(true);
         });
 
+        it("should return true for heap getters", () => {
+            expect(JSInterface.isGetter("heapLength")).toBe(true);
+        });
+
         it("should return false for a block that is not a getter", () => {
             expect(JSInterface.isGetter("pickup")).toBe(false);
         });
@@ -56,6 +60,14 @@ describe("JSInterface", () => {
             expect(JSInterface.isMethod("newnote")).toBe(true);
         });
 
+        it("should return true for heap methods", () => {
+            expect(JSInterface.isMethod("emptyHeap")).toBe(true);
+        });
+
+        it("should return true for heap push method", () => {
+            expect(JSInterface.isMethod("push")).toBe(true);
+        });
+
         it("should return false for a block that is not a method", () => {
             expect(JSInterface.isMethod("pickup")).toBe(false);
         });
@@ -86,6 +98,10 @@ describe("JSInterface", () => {
             expect(JSInterface.getGetterName("mynotevalue")).toBe("NOTEVALUE");
         });
 
+        it("should return the correct heap getter name when available", () => {
+            expect(JSInterface.getGetterName("heapLength")).toBe("HEAPLENGTH");
+        });
+
         it("should return null when no getter exists for the given block", () => {
             expect(JSInterface.getGetterName("pickup")).toBeNull();
         });
@@ -96,6 +112,14 @@ describe("JSInterface", () => {
             expect(JSInterface.getMethodName("newnote")).toBe("playNote");
         });
 
+        it("should return the correct heap method name when available", () => {
+            expect(JSInterface.getMethodName("emptyHeap")).toBe("emptyHeap");
+        });
+
+        it("should return the correct heap push method name when available", () => {
+            expect(JSInterface.getMethodName("push")).toBe("push");
+        });
+
         it("should return null when no method exists for the given block", () => {
             expect(JSInterface.getMethodName("pickup")).toBeNull();
         });
diff --git a/js/js-export/ast2blocks.json b/js/js-export/ast2blocks.json
index e48a76df70..fd6d271bba 100644
--- a/js/js-export/ast2blocks.json
+++ b/js/js-export/ast2blocks.json
@@ -241,14 +241,17 @@
             "name_map": {
                 "MODELENGTH": "modelength",
                 "SCALARCHANGEINPITCH": "deltapitch2",
-                "CHANGEINPITCH": "deltapitch",
-                "CURRENTKEY": "currentkey",
-                "CURRENTMODE": "currentmode",
-                "X": "x",
-                "Y": "y",
-                "GREY": "grey",
-                "SHADE": "shade",
-                "PENSIZE": "pensize",
+                    "CHANGEINPITCH": "deltapitch",
+                    "CURRENTKEY": "currentkey",
+                    "CURRENTMODE": "currentmode",
+                    "X": "x",
+                    "Y": "y",
+                    "HEAP": "heap",
+                    "HEAPLENGTH": "heapLength",
+                    "HEAPEMPTY": "heapEmpty",
+                    "GREY": "grey",
+                    "SHADE": "shade",
+                    "PENSIZE": "pensize",
                 "COLOR": "color",
                 "BEATCOUNT": "nopValueBlock",
                 "MEASURECOUNT": "nopValueBlock",
@@ -3699,6 +3702,221 @@
                 "next_sibling"
             ]
         },
+        {
+            "name": "emptyHeap",
+            "comment": "Empty heap block",
+            "ast": {
+                "identifiers": [
+                    {
+                        "property": "type",
+                        "value": "ExpressionStatement"
+                    },
+                    {
+                        "property": "expression.type",
+                        "value": "AwaitExpression"
+                    },
+                    {
+                        "property": "expression.argument.type",
+                        "value": "CallExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.type",
+                        "value": "MemberExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.property.name",
+                        "value": "emptyHeap"
+                    }
+                ]
+            },
+            "blocklist_connections": [
+                "parent_or_previous_sibling",
+                "next_sibling"
+            ]
+        },
+        {
+            "name": "reverseHeap",
+            "comment": "Reverse heap block",
+            "ast": {
+                "identifiers": [
+                    {
+                        "property": "type",
+                        "value": "ExpressionStatement"
+                    },
+                    {
+                        "property": "expression.type",
+                        "value": "AwaitExpression"
+                    },
+                    {
+                        "property": "expression.argument.type",
+                        "value": "CallExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.type",
+                        "value": "MemberExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.property.name",
+                        "value": "reverseHeap"
+                    }
+                ]
+            },
+            "blocklist_connections": [
+                "parent_or_previous_sibling",
+                "next_sibling"
+            ]
+        },
+        {
+            "name": "push",
+            "comment": "Push heap block",
+            "arguments": [
+                {
+                    "type": "ValueExpression"
+                }
+            ],
+            "ast": {
+                "identifiers": [
+                    {
+                        "property": "type",
+                        "value": "ExpressionStatement"
+                    },
+                    {
+                        "property": "expression.type",
+                        "value": "AwaitExpression"
+                    },
+                    {
+                        "property": "expression.argument.type",
+                        "value": "CallExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.type",
+                        "value": "MemberExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.property.name",
+                        "value": "push"
+                    },
+                    {
+                        "property": "expression.argument.arguments",
+                        "size": 1
+                    }
+                ],
+                "argument_properties": [
+                    "expression.argument.arguments[0]"
+                ]
+            },
+            "blocklist_connections": [
+                "parent_or_previous_sibling",
+                "argument",
+                "next_sibling"
+            ]
+        },
+        {
+            "name": "setHeapEntry",
+            "comment": "Set heap entry block",
+            "arguments": [
+                {
+                    "type": "NumberExpression"
+                },
+                {
+                    "type": "NumberExpression"
+                }
+            ],
+            "ast": {
+                "identifiers": [
+                    {
+                        "property": "type",
+                        "value": "ExpressionStatement"
+                    },
+                    {
+                        "property": "expression.type",
+                        "value": "AwaitExpression"
+                    },
+                    {
+                        "property": "expression.argument.type",
+                        "value": "CallExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.type",
+                        "value": "MemberExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.property.name",
+                        "value": "setHeapEntry"
+                    },
+                    {
+                        "property": "expression.argument.arguments",
+                        "size": 2
+                    }
+                ],
+                "argument_properties": [
+                    "expression.argument.arguments[0]",
+                    "expression.argument.arguments[1]"
+                ]
+            },
+            "blocklist_connections": [
+                "parent_or_previous_sibling",
+                "argument",
+                "argument",
+                "next_sibling"
+            ],
+            "default_vspaces": {
+                "body": 2
+            }
+        },
+        {
+            "name": "setHeapEntry",
+            "comment": "Set heap entry block (alias)",
+            "arguments": [
+                {
+                    "type": "NumberExpression"
+                },
+                {
+                    "type": "NumberExpression"
+                }
+            ],
+            "ast": {
+                "identifiers": [
+                    {
+                        "property": "type",
+                        "value": "ExpressionStatement"
+                    },
+                    {
+                        "property": "expression.type",
+                        "value": "AwaitExpression"
+                    },
+                    {
+                        "property": "expression.argument.type",
+                        "value": "CallExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.type",
+                        "value": "MemberExpression"
+                    },
+                    {
+                        "property": "expression.argument.callee.property.name",
+                        "value": "setHeap"
+                    },
+                    {
+                        "property": "expression.argument.arguments",
+                        "size": 2
+                    }
+                ],
+                "argument_properties": [
+                    "expression.argument.arguments[0]",
+                    "expression.argument.arguments[1]"
+                ]
+            },
+            "blocklist_connections": [
+                "parent_or_previous_sibling",
+                "argument",
+                "argument",
+                "next_sibling"
+            ],
+            "default_vspaces": {
+                "body": 2
+            }
+        },
         {
             "name": "debugger",
             "comment": "Debugger block",
@@ -3774,4 +3992,4 @@
             }
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/js/js-export/ast2blocks.min.json b/js/js-export/ast2blocks.min.json
index 1f25517fac..50affbd2cf 100644
--- a/js/js-export/ast2blocks.min.json
+++ b/js/js-export/ast2blocks.min.json
@@ -1 +1 @@
-{"default_connections":["parent_or_previous_sibling","argument","first_child","next_sibling"],"argument_blocks":[{"comment":"Variable name like 'box1' in the Boxes palette or action name like 'action' in the Action palette","ast":{"identifiers":[{"property":"type","value":"Identifier"}],"identifier_property":"name"}},{"comment":"Number expression like '1 / 4' in the Number palette or boolean expressions like 'box1 >= 0' in the Boolean palette","ast":{"identifiers":[{"property":"type","value":"BinaryExpression"}],"name_property":"operator","argument_properties":["left","right"]},"name_map":{"+":"plus","-":"minus","*":"multiply","/":"divide","%":"mod","==":"equal","!=":"not_equal_to","<":"less",">":"greater","<=":"less_than_or_equal_to",">=":"greater_than_or_equal_to","|":"or","&":"and","^":"xor"}},{"comment":"Unary expressions such as ! in boolean palette or - in number palette","ast":{"identifiers":[{"property":"type","value":"UnaryExpression"}],"name_property":"operator","argument_properties":["argument"]},"name_map":{"-":"neg","!":"not"}},{"comment":"Literals such as numbers or booleans or strings","ast":{"identifiers":[{"property":"type","value":"Literal"}],"value_property":"value"}},{"comment":"Dictionary get function for 2 arguments","ast":{"identifiers":[{"property":"type","value":"AwaitExpression"},{"property":"argument.type","value":"CallExpression"},{"property":"argument.callee.type","value":"MemberExpression"},{"property":"argument.callee.property.name","value":"getValue"},{"property":"argument.arguments","size":2}],"name_property":"argument.callee.property.name","argument_properties":["argument.arguments[1]","argument.arguments[0]"]},"name_map":{"getValue":"getDict"}},{"comment":"Dictionary get function for 1 argument","ast":{"identifiers":[{"property":"type","value":"AwaitExpression"},{"property":"argument.type","value":"CallExpression"},{"property":"argument.callee.type","value":"MemberExpression"},{"property":"argument.callee.property.name","value":"getValue"},{"property":"argument.arguments","size":1}],"name_property":"argument.callee.property.name","argument_properties":["argument.arguments[0]"]},"name_map":{"getValue":"getDict2"}},{"comment":"Skip, this is for children","ast":{"identifiers":[{"property":"type","value":"ArrowFunctionExpression"}]}},{"comment":"Math operators such as absolute value or square","ast":{"identifiers":[{"property":"type","value":"CallExpression"},{"property":"callee.type","value":"MemberExpression"},{"property":"callee.object.type","value":"Identifier"},{"property":"callee.object.name","value":"Math"}],"name_property":"callee.property.name","arguments_property":"arguments"},"name_map":{"abs":"abs","floor":"int","pow":"power","sqrt":"sqrt"}},{"comment":"Math utility operators such as distance or random","ast":{"identifiers":[{"property":"type","value":"CallExpression"},{"property":"callee.type","value":"MemberExpression"},{"property":"callee.object.type","value":"Identifier"},{"property":"callee.object.name","value":"MathUtility"}],"name_property":"callee.property.name","arguments_property":"arguments"},"name_map":{"doCalculateDistance":"distance","doOneOf":"oneOf","doRandom":"random"}},{"comment":"Singular argument mouse blocks","ast":{"identifiers":[{"property":"type","value":"MemberExpression"},{"property":"object.name","value":"mouse"}],"name_property":"property.name","argument_properties":[]},"name_map":{"MODELENGTH":"modelength","SCALARCHANGEINPITCH":"deltapitch2","CHANGEINPITCH":"deltapitch","CURRENTKEY":"currentkey","CURRENTMODE":"currentmode","X":"x","Y":"y","GREY":"grey","SHADE":"shade","PENSIZE":"pensize","COLOR":"color","BEATCOUNT":"nopValueBlock","MEASURECOUNT":"nopValueBlock","BPM":"nopValueBlock","BEATFACTOR":"beatfactor","NOTEVALUE":"notevalue"}},{"comment":"Get synth volume value","ast":{"identifiers":[{"property":"type","value":"CallExpression"},{"property":"callee.name","value":"getSynthVolume"}],"name_property":"callee.name","argument_properties":["arguments[0]"]},"name_map":{"getSynthVolume":"synthvolumefactor"}},{"comment":"Number to pitch/octave conversion","ast":{"identifiers":[{"property":"type","value":"CallExpression"}],"name_property":"callee.name","argument_properties":["arguments[0]"]},"name_map":{"numToOctave":"number2octave","numToPitch":"number2pitch"}}],"body_blocks":[{"comment":"run is ignored","ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"CallExpression"},{"property":"expression.callee.type","value":"MemberExpression"},{"property":"expression.callee.object.name","value":"MusicBlocks"},{"property":"expression.callee.property.name","value":"run"}]}},{"name":"storein2","comment":"Variable assignment in the Boxes palette like 'var box1 = 2 * 5;'","arguments":[{"type":"ValueExpression"}],"ast":{"identifiers":[{"property":"type","value":"VariableDeclaration"},{"property":"declarations[0].init.type","value":"Literal"},{"property":"declarations[0].init.type","value":"BinaryExpression"},{"property":"declarations[0].init.type","value":"UnaryExpression"},{"property":"declarations[0].init.type","value":"CallExpression"}],"name_property":"declarations[0].id.name","argument_properties":["declarations[0].init"]},"blocklist_connections":["parent_or_previous_sibling","argument","next_sibling"]},{"name":"decrementOne","comment":"Decrement by one block in the Boxes palette 'box1 = box1 - 1;'","arguments":[{"type":"namedbox"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AssignmentExpression"},{"property":"expression.right.type","value":"BinaryExpression"},{"property":"expression.right.operator","value":"-"},{"property":"expression.right.right.value","value":1}],"argument_properties":["expression.left"]},"blocklist_connections":["parent_or_previous_sibling","argument","next_sibling"]},{"name":"increment","comment":"Increment block in the Boxes palette 'box1 = box1 + 3;'","arguments":[{"type":"namedbox"},{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AssignmentExpression"},{"property":"expression.right.type","value":"BinaryExpression"},{"property":"expression.right.operator","value":"+"}],"argument_properties":["expression.left","expression.right.right"]},"blocklist_connections":["parent_or_previous_sibling","argument","argument","next_sibling"],"default_vspaces":{"body":2}},{"name":"settimbre","comment":"Set instrument block","arguments":[{"type":"voicename"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"setInstrument"}],"argument_properties":["expression.argument.arguments[0]"],"children_properties":["expression.argument.arguments[1].body.body"]},"default_vspaces":{"argument":1}},{"name":"tie","comment":"Tie block in the Rhythm palette","ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"tie"}],"children_properties":["expression.argument.arguments[0].body.body"]},"blocklist_connections":["parent_or_previous_sibling","first_child","next_sibling"],"default_vspaces":{"argument":0}},{"name":"newswing2","comment":"Swing block in the Rhythm palette","arguments":[{"type":"NumberExpression"},{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"swing"}],"argument_properties":["expression.argument.arguments[0]","expression.argument.arguments[1]"],"children_properties":["expression.argument.arguments[2].body.body"]},"blocklist_connections":["parent_or_previous_sibling","argument","argument","first_child","next_sibling"],"default_vspaces":{"argument":2}},{"name":"pitch","comment":"Pitch block","arguments":[{"type":"note_or_solfege"},{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"playPitch"}],"argument_properties":["expression.argument.arguments[0]","expression.argument.arguments[1]"]},"blocklist_connections":["parent_or_previous_sibling","argument","argument","next_sibling"],"default_vspaces":{"body":2}},{"name":"hertz","comment":"Hertz block","arguments":[{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"playHertz"}],"argument_properties":["expression.argument.arguments[0]"]},"blocklist_connections":["parent_or_previous_sibling","argument","next_sibling"]},{"name":"rest2","comment":"Rest block","ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"playRest"}]},"blocklist_connections":["parent_or_previous_sibling","next_sibling"]},{"name":"nameddo","comment":"Action palette, async block","ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"Identifier"}],"name_property":"expression.argument.callee.name"},"blocklist_connections":["parent_or_previous_sibling","next_sibling"]},{"name":"start","comment":"Start block in the Flow palette","ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"NewExpression"}],"children_properties":["expression.arguments[0].body.body"]},"blocklist_connections":["parent_or_previous_sibling","first_child","next_sibling"],"default_vspaces":{"argument":1}},{"name":"action","comment":"Action block in the Action palette","arguments":[{"type":"text"}],"ast":{"identifiers":[{"property":"type","value":"VariableDeclaration"},{"property":"declarations[0].init.type","value":"ArrowFunctionExpression"}],"argument_properties":["declarations[0].id"],"children_properties":["declarations[0].init.body.body"]},"default_vspaces":{"argument":1}},{"name":"repeat","comment":"Repeat block in the Flow 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block","arguments":[{"type":"NumberExpression"},{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"setHeapEntry"},{"property":"expression.argument.arguments","size":2}],"argument_properties":["expression.argument.arguments[0]","expression.argument.arguments[1]"]},"blocklist_connections":["parent_or_previous_sibling","argument","argument","next_sibling"],"default_vspaces":{"body":2}},{"name":"setHeapEntry","comment":"Set heap entry block (alias)","arguments":[{"type":"NumberExpression"},{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"},{"property":"expression.argument.callee.property.name","value":"setHeap"},{"property":"expression.argument.arguments","size":2}],"argument_properties":["expression.argument.arguments[0]","expression.argument.arguments[1]"]},"blocklist_connections":["parent_or_previous_sibling","argument","argument","next_sibling"],"default_vspaces":{"body":2}},{"name":"debugger","comment":"Debugger block","arguments":[{"type":"BooleanExpression"}],"ast":{"identifiers":[{"property":"type","value":"DebuggerStatement"}]},"blocklist_connections":["parent_or_previous_sibling","argument","next_sibling"]},{"name_map":{"playNote":"newnote","dot":"rhythmicdot2","multiplyNoteValue":"multiplybeatfactor","playNoteMillis":"osctime","doCrescendo":"crescendo","doDecrescendo":"decrescendo","setSemitoneTranspose":"settransposition","setScalarInterval":"interval","doDistortion":"dis","doHarmonic":"harmonic2","setStaccato":"newstaccato","setSlur":"newslur","setRelativeVolume":"articulation"},"comment":"Flow blocks with one number argument","arguments":[{"type":"NumberExpression"}],"ast":{"identifiers":[{"property":"type","value":"ExpressionStatement"},{"property":"expression.type","value":"AwaitExpression"},{"property":"expression.argument.type","value":"CallExpression"},{"property":"expression.argument.callee.type","value":"MemberExpression"}],"argument_properties":["expression.argument.arguments[0]"],"children_properties":["expression.argument.arguments[1].body.body"]},"default_vspaces":{"argument":1}}]}
\ No newline at end of file
diff --git a/js/js-export/export.js b/js/js-export/export.js
index 46f98c4d51..9a7ffcedcd 100644
--- a/js/js-export/export.js
+++ b/js/js-export/export.js
@@ -316,6 +316,16 @@ class MusicBlocks {
         }
     }
 
+    _ensureHeap() {
+        if (!globalActivity.logo.turtleHeaps) {
+            globalActivity.logo.turtleHeaps = {};
+        }
+        if (!(this.turIndex in globalActivity.logo.turtleHeaps)) {
+            globalActivity.logo.turtleHeaps[this.turIndex] = [];
+        }
+        return globalActivity.logo.turtleHeaps[this.turIndex];
+    }
+
     // ========= Getters/Setters ===================================================================
 
     // ============================== GRAPHICS ================================
@@ -332,6 +342,72 @@ class MusicBlocks {
         return this.turtle.orientation;
     }
 
+    // =============================== HEAP ===================================
+
+    get HEAP() {
+        return JSON.stringify(this._ensureHeap());
+    }
+
+    get HEAPLENGTH() {
+        return this._ensureHeap().length;
+    }
+
+    get HEAPEMPTY() {
+        return this._ensureHeap().length === 0;
+    }
+
+    emptyHeap() {
+        this._ensureHeap();
+        globalActivity.logo.turtleHeaps[this.turIndex] = [];
+    }
+
+    reverseHeap() {
+        const heap = this._ensureHeap();
+        globalActivity.logo.turtleHeaps[this.turIndex] = heap.reverse();
+    }
+
+    setHeapEntry(index, value) {
+        if (index === null || index === undefined || value === null || value === undefined) {
+            JSEditor.logConsole("Missing heap index or value.", "maroon");
+            return;
+        }
+
+        if (typeof index !== "number" || typeof value !== "number") {
+            JSEditor.logConsole("Heap index and value must be numbers.", "maroon");
+            return;
+        }
+
+        let idx = Math.floor(index);
+        if (idx < 1) {
+            JSEditor.logConsole("Index must be > 0.", "maroon");
+            idx = 1;
+        }
+
+        if (idx > 1000) {
+            JSEditor.logConsole("Maximum heap size is 1000.", "maroon");
+            idx = 1000;
+        }
+
+        const heap = this._ensureHeap();
+        while (heap.length < idx) {
+            heap.push(0);
+        }
+        heap[idx - 1] = value;
+    }
+
+    setHeap(index, value) {
+        this.setHeapEntry(index, value);
+    }
+
+    push(value) {
+        if (value === null || value === undefined) {
+            JSEditor.logConsole("Missing heap value.", "maroon");
+            return;
+        }
+        const heap = this._ensureHeap();
+        heap.push(value);
+    }
+
     // ================================ PEN ===================================
 
     get PENSIZE() {
diff --git a/js/js-export/interface.js b/js/js-export/interface.js
index 14989cc677..e963dcbeb1 100644
--- a/js/js-export/interface.js
+++ b/js/js-export/interface.js
@@ -119,6 +119,10 @@ class JSInterface {
         x: "X",
         y: "Y",
         heading: "HEADING",
+        // Heap blocks
+        heap: "HEAP",
+        heapLength: "HEAPLENGTH",
+        heapEmpty: "HEAPEMPTY",
         // Pen blocks
         pensize: "PENSIZE",
         color: "COLOR",
@@ -192,6 +196,11 @@ class JSInterface {
         setdrum: "setDrum",
         mapdrum: "mapPitchToDrum",
         playnoise: "playNoise",
+        // Heap blocks
+        emptyHeap: "emptyHeap",
+        reverseHeap: "reverseHeap",
+        setHeapEntry: "setHeapEntry",
+        push: "push",
         // Number blocks
         random: "MathUtility.doRandom",
         oneOf: "MathUtility.doOneOf",