From 353e21478c01561fa698d5219fe4851ea178f8e5 Mon Sep 17 00:00:00 2001
From: Sean Rennie <sean.rennie@sensat.co.uk>
Date: Fri, 22 Sep 2023 10:58:37 +0100
Subject: [PATCH 1/2] build for esm

---
 Cargo.toml       |  2 +-
 scripts/build.sh | 32 ++++++++++++++++++++++++++++++--
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index a76519e..c653c06 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "geodesy-wasm"
-version = "0.2.0--alpha1"
+version = "0.2.0-beta2"
 keywords = ["geospatial", "geodesy", "cartography", "geography"]
 categories = ["science"]
 authors = ["Sean Rennie <sean.rennie@sensat.co.uk>"]
diff --git a/scripts/build.sh b/scripts/build.sh
index dd547f4..587e475 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -42,6 +42,19 @@ else
   echo "Skipping bundler target"
 fi
 
+# Build esm version into tmp_build/esm
+if [ -z "${TARGET+x}" ] || [ "$TARGET" == "esm" ]; then
+  echo "Building esm target"
+  wasm-pack build \
+    $BUILD \
+    --out-dir tmp_build/esm \
+    --out-name geodesy-wasm \
+    --target web \
+    $FLAGS
+else
+  echo "Skipping esm target"
+fi
+
 # Compile JS Wrapper
 
 # Compile geodesy.ts for bundler
@@ -62,17 +75,32 @@ else
   echo "Skipping node target TS compilation"
 fi
 
+# Compile geodesy.ts for Node
+if [ -z "${TARGET+x}" ] || [ "$TARGET" == "esm" ]; then
+  sed 's/@geodesy-wasm/\.\/geodesy-wasm.js/g' js/geodesy.ts > tmp_build/esm/index.ts
+  bun tsc tmp_build/esm/index.ts --outDir tmp_build/esm --declaration --declarationDir tmp_build/esm --target es2020 --module ESNEXT
+  rm tmp_build/esm/index.ts
+else
+  echo "Skipping esm target TS compilation"
+fi
+
 # Copy files into pkg/
-mkdir -p pkg/{node,bundler}
+mkdir -p pkg/{node,bundler,esm}
 cp tmp_build/bundler/geodesy-wasm* pkg/bundler/
 cp tmp_build/bundler/index* pkg/bundler/
 
-cp tmp_build/node/geodesy-wasm* pkg/node
+cp tmp_build/node/geodesy-wasm* pkg/node/
 cp tmp_build/node/index* pkg/node/
 
+cp tmp_build/esm/geodesy-wasm* pkg/esm/
+cp tmp_build/esm/index* pkg/esm/
+
 cp tmp_build/bundler/{package.json,README.md} pkg/
 cp {LICENSE-MIT,LICENSE-APACHE} pkg/
 
+# Create minimal package.json in esm/ folder with type: module
+echo '{"type": "module"}' > pkg/esm/package.json
+
 # Update files array in package.json using JQ
 # Set module field to bundler/geodesy-wasm.js
 # Set types field to bundler/geodesy-wasm.d.ts

From ad3c8cda5446a29615ba11b662ee5a2f7c2e5397 Mon Sep 17 00:00:00 2001
From: Sean Rennie <sean.rennie@sensat.co.uk>
Date: Fri, 22 Sep 2023 10:58:46 +0100
Subject: [PATCH 2/2] update change log and read me

---
 CHANGELOG.md | 11 +++++++++--
 README.md    |  4 ++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 211e5cc..75cb102 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.0-beta2] - 2021-10-20
+
+### Added
+
+- ESM Build [#16](https://github.com/Rennzie/geodesy-wasm/issues/16)
+- Example usage in ObservableHQ
+
+## [0.2.0-beta1] - 2021-10-20
+
 ### Added
 
 - This CHANGELOG file
@@ -26,5 +35,3 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update the README with usage examples and better documentation [#9](https://github.com/Rennzie/geodesy-wasm/issues/9)
 - Add tests for the wrapper [#10](https://github.com/Rennzie/geodesy-wasm/issues/10)
   - Replaced yarn with [bun](https://bun.sh/docs/cli/test) in the process
-
-[unreleased]:
diff --git a/README.md b/README.md
index bd83245..5b93135 100644
--- a/README.md
+++ b/README.md
@@ -168,6 +168,10 @@ console.log(resultFwd);
 // [[ 13004.309008754391 6837202.757094237 9.61 ], [ 13007.829360281388 6837191.955741842 9.61 ]]
 ```
 
+#### Using ESM Modules in ObservableHQ
+
+See [this notebook](https://observablehq.com/d/3ff9d9b8f0b5168a) for an example of using Geodesy-Wasm in ObservableHQ.
+
 ## Development
 
 For convenience all scripts can be run with `bun <script>`. Make sure all the javascript related dependencies are installed with `bun install`. Rust dependencies are managed by [cargo](https://doc.rust-lang.org/cargo/) and don't require and explicit install step.