From 60ec14215763478f3df477d27cdf0e9d19fbaf1c Mon Sep 17 00:00:00 2001
From: Jovi De Croock <decroockjovi@gmail.com>
Date: Wed, 22 Apr 2020 00:35:23 +0200
Subject: [PATCH 1/3] add script to remove empty imports/requires

---
 packages/core/package.json                    |  1 +
 packages/core/scripts/remove-empty-imports.js | 50 +++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 packages/core/scripts/remove-empty-imports.js

diff --git a/packages/core/package.json b/packages/core/package.json
index 22bebff6e1..e3fbea365f 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -48,6 +48,7 @@
     "check": "tsc --noEmit",
     "lint": "eslint --ext=js,jsx,ts,tsx .",
     "build": "rollup -c ../../scripts/rollup/config.js",
+    "postbuild": "node ./scripts/remove-empty-imports.js",
     "prepare": "../../scripts/prepare/index.js",
     "prepublishOnly": "run-s clean build"
   },
diff --git a/packages/core/scripts/remove-empty-imports.js b/packages/core/scripts/remove-empty-imports.js
new file mode 100644
index 0000000000..74c67c939b
--- /dev/null
+++ b/packages/core/scripts/remove-empty-imports.js
@@ -0,0 +1,50 @@
+const { transformSync: transform } = require('@babel/core');
+const fs = require('fs');
+
+const nonMinified = [
+  `${process.cwd()}/dist/urql-core.js`,
+  `${process.cwd()}/dist/urql-core.mjs`,
+  `${process.cwd()}/dist/urql-core-internal.js`,
+  `${process.cwd()}/dist/urql-core-internal.mjs`,
+];
+
+const minified = [
+  `${process.cwd()}/dist/urql-core.min.js`,
+  `${process.cwd()}/dist/urql-core.min.mjs`,
+  `${process.cwd()}/dist/urql-core-internal.min.js`,
+  `${process.cwd()}/dist/urql-core-internal.min.mjs`,
+];
+
+const removeEmptyImports = (babel) => {
+  const { types: t } = babel;
+
+  return {
+    visitor: {
+      ImportDeclaration(path) {
+        const { specifiers } = path.node
+        if (specifiers.length === 0) {
+          path.remove();
+        }
+      },
+      CallExpression(path) {
+        if (
+          t.isIdentifier(path.node.callee) &&
+          path.node.callee.name === 'require' &&
+          path.parent.type !== 'VariableDeclarator'
+        ) {
+          path.remove();
+        }
+      }
+    }
+  };
+}
+
+nonMinified.forEach(loc => {
+  const { code: newCode } = transform(fs.readFileSync(loc), { plugins: [removeEmptyImports], babelrc: false });
+  fs.writeFileSync(loc, newCode);
+});
+
+minified.forEach(loc => {
+  const { code: newCode } = transform(fs.readFileSync(loc), { plugins: [removeEmptyImports], babelrc: false, minified: true });
+  fs.writeFileSync(loc, newCode);
+});

From 5d3da32e69e7259087d1a2ac6a6b0d46199f62c3 Mon Sep 17 00:00:00 2001
From: Jovi De Croock <decroockjovi@gmail.com>
Date: Wed, 22 Apr 2020 00:36:54 +0200
Subject: [PATCH 2/3] add changeset

---
 .changeset/strong-radios-judge.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/strong-radios-judge.md

diff --git a/.changeset/strong-radios-judge.md b/.changeset/strong-radios-judge.md
new file mode 100644
index 0000000000..5103c81ac1
--- /dev/null
+++ b/.changeset/strong-radios-judge.md
@@ -0,0 +1,5 @@
+---
+'@urql/core': patch
+---
+
+Add a babel-plugin that removes empty imports from the final build output.

From 3a4e3533121765b87839f9ee8666582071f4e377 Mon Sep 17 00:00:00 2001
From: Jovi De Croock <jovi.decroock@formidable.com>
Date: Wed, 22 Apr 2020 00:58:46 +0200
Subject: [PATCH 3/3] remove the minified entries because of CI

---
 packages/core/scripts/remove-empty-imports.js | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/packages/core/scripts/remove-empty-imports.js b/packages/core/scripts/remove-empty-imports.js
index 74c67c939b..38e1ce94b8 100644
--- a/packages/core/scripts/remove-empty-imports.js
+++ b/packages/core/scripts/remove-empty-imports.js
@@ -8,13 +8,6 @@ const nonMinified = [
   `${process.cwd()}/dist/urql-core-internal.mjs`,
 ];
 
-const minified = [
-  `${process.cwd()}/dist/urql-core.min.js`,
-  `${process.cwd()}/dist/urql-core.min.mjs`,
-  `${process.cwd()}/dist/urql-core-internal.min.js`,
-  `${process.cwd()}/dist/urql-core-internal.min.mjs`,
-];
-
 const removeEmptyImports = (babel) => {
   const { types: t } = babel;
 
@@ -43,8 +36,3 @@ nonMinified.forEach(loc => {
   const { code: newCode } = transform(fs.readFileSync(loc), { plugins: [removeEmptyImports], babelrc: false });
   fs.writeFileSync(loc, newCode);
 });
-
-minified.forEach(loc => {
-  const { code: newCode } = transform(fs.readFileSync(loc), { plugins: [removeEmptyImports], babelrc: false, minified: true });
-  fs.writeFileSync(loc, newCode);
-});