build(hash): switch from wasm-pack to using wasm-bindgen directly

.github/workflows/wasm.yml

@@ -0,0 +1,62 @@
+name: "rebuild wasm"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  rebuild-wasm:
+    runs-on: ubuntu-latest
+    steps:
+        - uses: actions/checkout@v2
+        - name: install dependencies
+          run: |-
+            curl -fsSL https://deno.land/x/install/install.sh | sh
+            echo "$HOME/.deno/bin" >> $GITHUB_PATH
+
+            rustup target add wasm32-unknown-unknown
+
+            # This must match the version in hash/_wasm/Cargo.lock:
+            cargo install -f wasm-bindgen-cli --version 0.2.74
+
+        - name: rebuild generated files
+          id: build
+          run: |-
+            ./hash/_wasm/build.ts
+
+            declare had_changes="$(
+              [[ -n "$(git status --porcelain)" ]] && echo true || echo false
+            )"
+            echo "::set-output name=had-changes::${had_changes}"
+
+        - name: commit and push generated files
+          if: success() && steps.build.outputs.had-changes == 'true'
+          run: |
+            declare br="
+            "
+            declare branch="$(echo ${GITHUB_REF#refs/heads/})"
+            declare date="$(git log -1 --pretty=format:'%ad')"
+            declare short_hash="$(git rev-parse --short=8 HEAD)"
+            declare short_subject="$(git log -1 --pretty=format:'%s')"
+            declare short_subject="$(git log -1 --pretty=format:'%s')"
+            if [[ ${#short_subject} -gt 50 ]]; then
+              short_subject="${short_subject:0:49}…"
+            fi
+            declare author_name="$(git log -1 --pretty=format:'%an')"
+            declare author_email="$(git log -1 --pretty=format:'%ae')"
+            declare current_action_url="https://github.com/${GITHUB_REPOSITORY}/actions/runs/${{ github.run_id }}"
+
+            export GIT_AUTHOR_DATE="${date}"
+            export GIT_AUTHOR_NAME="${author_name}"
+            export GIT_AUTHOR_EMAIL="${author_email}"
+
+            export GIT_COMMITTER_DATE="${date}"
+            export GIT_COMMITTER_NAME="github-actions"
+            export GIT_COMMITTER_EMAIL="41898282+github-actions[bot]@users.noreply.github.com"
+
+            git remote rm origin
+            git remote add origin "https://${GITHUB_ACTOR}:${{ secrets.GITHUB_TOKEN }}@github.com/${GITHUB_REPOSITORY}.git"
+            git checkout "${branch}"
+
+            git add .
+            git commit -m "chore(hash): rebuild wasm${br}${br}${current_action_url}"
+            git push --set-upstream origin "${branch}"

.gitignore

@@ -5,4 +5,6 @@ deno.d.ts
 package.json
 package-lock.json
 .vscode/settings.json
-**/cov/
+**/cov/
+/hash/_wasm/target
+/hash/_wasm/out

hash/_wasm/README.md

@@ -2,16 +2,20 @@
 
 ## Prerequisite
 
-`wasm-pack` is required.
+`wasm-bindgen` is required.
 
 ```sh
-cargo install wasm-pack
+cargo build --target wasm32-unknown-unknown
+rustup target add wasm32-wasi
+
+# This must match the version in hash/_wasm/Cargo.lock:
+cargo install -f wasm-bindgen-cli --version 0.2.74
 ```
 
 ## Build
 
 ```sh
-deno run --allow-read --allow-write --allow-run ./build.ts
+deno run --allow-all build.ts
 ```
 
 `wasm.js` will be generated.