diff --git a/packages/core/package.json b/packages/core/package.json
index 5d464f120a..f767597710 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -7,6 +7,7 @@
   "typings": "dist/esm/index.d.ts",
   "style": "dist/blueprint.css",
   "unpkg": "dist/core.bundle.js",
+  "sideEffects": false,
   "scripts": {
     "compile": "npm-run-all -s compile:pre -p 'compile:*'",
     "compile:pre": "generate-icons-source",
diff --git a/packages/datetime/package.json b/packages/datetime/package.json
index 5c9e404ed1..e9fd97a3a9 100644
--- a/packages/datetime/package.json
+++ b/packages/datetime/package.json
@@ -7,6 +7,7 @@
   "typings": "dist/esm/index.d.ts",
   "style": "dist/blueprint-datetime.css",
   "unpkg": "dist/datetime.bundle.js",
+  "sideEffects": false,
   "scripts": {
     "compile": "npm-run-all -p 'compile:*'",
     "compile:esm": "tsc -p ./src",
diff --git a/packages/docs/package.json b/packages/docs/package.json
index 966875d5d2..bf4ccc6b38 100644
--- a/packages/docs/package.json
+++ b/packages/docs/package.json
@@ -7,6 +7,7 @@
   "typings": "dist/esm/index.d.ts",
   "style": "dist/docs.css",
   "unpkg": "dist/docs.bundle.js",
+  "sideEffects": false,
   "scripts": {
     "compile": "npm-run-all -p 'compile:*'",
     "compile:esm": "tsc -p ./src",
diff --git a/packages/labs/package.json b/packages/labs/package.json
index e1b4a8185d..0d2c079b81 100644
--- a/packages/labs/package.json
+++ b/packages/labs/package.json
@@ -7,6 +7,7 @@
   "typings": "dist/esm/index.d.ts",
   "style": "dist/blueprint-labs.css",
   "unpkg": "dist/labs.bundle.js",
+  "sideEffects": false,
   "scripts": {
     "compile": "npm-run-all -p 'compile:*'",
     "compile:esm": "tsc -p ./src",
diff --git a/packages/table/package.json b/packages/table/package.json
index 54a39aa6da..d06e3237d4 100644
--- a/packages/table/package.json
+++ b/packages/table/package.json
@@ -7,6 +7,7 @@
   "typings": "dist/esm/index.d.ts",
   "style": "dist/table.css",
   "unpkg": "dist/table.bundle.js",
+  "sideEffects": false,
   "scripts": {
     "compile": "npm-run-all -p 'compile:*'",
     "compile:esm": "tsc -p ./src",