diff --git a/packages/blaze-tools/preamble.js b/packages/blaze-tools/preamble.js
index e39fe53ac..0ea86ee21 100644
--- a/packages/blaze-tools/preamble.js
+++ b/packages/blaze-tools/preamble.js
@@ -14,7 +14,7 @@ import {
   parseStringLiteral
 } from './tokens';
 
-BlazeTools = {
+export const BlazeTools = {
   EmitCode,
   toJSLiteral,
   toObjectLiteralKey,
@@ -25,5 +25,3 @@ BlazeTools = {
   parseExtendedIdentifierName,
   parseStringLiteral
 };
-
-export { BlazeTools };
diff --git a/packages/blaze/blaze.d.ts b/packages/blaze/blaze.d.ts
new file mode 100644
index 000000000..b3f72526b
--- /dev/null
+++ b/packages/blaze/blaze.d.ts
@@ -0,0 +1,25 @@
+import { Blaze } from 'meteor/blaze';
+
+export namespace Meteor {
+
+  /** Event **/
+  interface Event {
+    type: string;
+    target: HTMLElement;
+    currentTarget: HTMLElement;
+    which: number;
+    stopPropagation(): void;
+    stopImmediatePropagation(): void;
+    preventDefault(): void;
+    isPropagationStopped(): boolean;
+    isImmediatePropagationStopped(): boolean;
+    isDefaultPrevented(): boolean;
+  }
+  interface EventHandlerFunction extends Function {
+    (event?: Event, templateInstance?: Blaze.TemplateInstance): void;
+  }
+  interface EventMap {
+    [id: string]: EventHandlerFunction;
+  }
+  /** Event **/
+}
diff --git a/packages/blaze/dombackend.js b/packages/blaze/dombackend.js
index 361e37ae5..f8be19492 100644
--- a/packages/blaze/dombackend.js
+++ b/packages/blaze/dombackend.js
@@ -1,3 +1,10 @@
+// this is necessary because when esbuild chunks things (when using dynamic imports)
+// it assumes that every import in that chunk is independent of each other (which is technically correct)
+// however, because blaze has an implicit depedency that jquery loads first, this fails.
+// this could be fixed more correctly by changing how we generate dependencies.js - but it would be brutal
+// it would require that every import be alone in a file with an import to it's predecessor
+import "meteor/jquery";
+
 var DOMBackend = {};
 Blaze._DOMBackend = DOMBackend;
 
diff --git a/packages/html-tools/main.js b/packages/html-tools/main.js
index 4250fb909..fe2c12b25 100644
--- a/packages/html-tools/main.js
+++ b/packages/html-tools/main.js
@@ -6,7 +6,7 @@ import { Scanner } from './scanner';
 import { parseFragment, codePointToString, getContent, getRCData } from './parse';
 import { getComment, getDoctype, getHTMLToken, getTagToken, TEMPLATE_TAG_POSITION } from './tokenize';
 
-HTMLTools = {
+const HTMLTools = {
   asciiLowerCase,
   properCaseTagName,
   properCaseAttributeName,
diff --git a/packages/observe-sequence/observe_sequence.js b/packages/observe-sequence/observe_sequence.js
index fd4a591c3..5fa6b5b6e 100644
--- a/packages/observe-sequence/observe_sequence.js
+++ b/packages/observe-sequence/observe_sequence.js
@@ -2,15 +2,6 @@ const isObject = function (value) {
   var type = typeof value;
   return value != null && (type == 'object' || type == 'function');
 }
-const has = function (obj, key) {
-  var keyParts = key.split('.');
-
-  return !!obj && (
-    keyParts.length > 1
-      ? has(obj[key.split('.')[0]], keyParts.slice(1).join('.'))
-      : hasOwnProperty.call(obj, key)
-  );
-};
 
 const warn = function () {
   if (ObserveSequence._suppressWarnings) {
@@ -353,12 +344,12 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
         prevPosition);
     }
   });
-  
+
   Object.entries(posNew).forEach(function ([idString, pos]) {
 
     var id = idParse(idString);
-    
-    if (has(posOld, idString)) {
+
+    if (Object.hasOwnProperty.call(posOld, idString)) {
       // specifically for primitive types, compare equality before
       // firing the 'changedAt' callback. otherwise, always fire it
       // because doing a deep EJSON comparison is not guaranteed to
diff --git a/packages/observe-sequence/package.js b/packages/observe-sequence/package.js
index 934901033..60d37d642 100644
--- a/packages/observe-sequence/package.js
+++ b/packages/observe-sequence/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "Observe changes to various sequence types such as arrays, cursors and objects",
-  version: "1.0.20"
+  version: "1.0.21"
 });
 
 Package.onUse(function (api) {
diff --git a/packages/spacebars-compiler/preamble.js b/packages/spacebars-compiler/preamble.js
index 447522223..053d6c3d3 100644
--- a/packages/spacebars-compiler/preamble.js
+++ b/packages/spacebars-compiler/preamble.js
@@ -3,7 +3,7 @@ import { optimize } from './optimizer';
 import { parse, compile, codeGen, TemplateTagReplacer, beautify } from './compiler';
 import { TemplateTag } from './templatetag';
 
-SpacebarsCompiler = {
+export const SpacebarsCompiler = {
   CodeGen,
   _builtInBlockHelpers: builtInBlockHelpers,
   isReservedName,
@@ -15,5 +15,3 @@ SpacebarsCompiler = {
   _beautify: beautify,
   TemplateTag,
 };
-
-export { SpacebarsCompiler };