From 0857b726cf28ac458f6150aa576f4243975efce1 Mon Sep 17 00:00:00 2001
From: George Harker <george@george-graphics.co.uk>
Date: Mon, 13 Apr 2026 11:49:27 -0700
Subject: [PATCH] feat: add swap-size parameter for Wasm builds that need more
 memory

Some grammars (e.g. tree-sitter-zsh) exceed available memory during Wasm
compilation on GitHub Actions runners.  Rather than forcing consumers to
maintain local copies of these workflows just to insert a swap resize
step, expose an optional `swap-size` input on the release and
package-npm workflows.

The default value `normal` skips the resize entirely, keeping existing
behaviour unchanged.  Setting it to a size like `64G` allocates that
much swap before the Wasm build step.
---
 .github/workflows/package-npm.yml | 19 +++++++++++++++++++
 .github/workflows/release.yml     | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/.github/workflows/package-npm.yml b/.github/workflows/package-npm.yml
index 29b17d5..4c05915 100644
--- a/.github/workflows/package-npm.yml
+++ b/.github/workflows/package-npm.yml
@@ -23,6 +23,14 @@ on:
         description: The tree-sitter ABI version
         default: 15
         type: number
+      swap-size:
+        description: >
+          Resize the runner swap space before the Wasm build.
+          Set to a size such as "64G" to allocate that much swap, or leave
+          as "normal" (the default) to skip the resize entirely.
+          Useful for grammars whose Wasm compilation exceeds available memory.
+        default: normal
+        type: string
     secrets:
       NODE_AUTH_TOKEN:
         description: An authentication token for npm
@@ -57,6 +65,17 @@ jobs:
           done < <(jq -r '.grammars[].path // "."' tree-sitter.json)
         env:
           TREE_SITTER_ABI_VERSION: ${{inputs.abi-version}}
+      - name: Increase swap space
+        if: inputs.swap-size != 'normal'
+        run: |
+          sudo swapoff -a
+          sudo fallocate -l "$SWAP_SIZE" /swapfile
+          sudo chmod 600 /swapfile
+          sudo mkswap /swapfile
+          sudo swapon /swapfile
+          sudo swapon --show
+        env:
+          SWAP_SIZE: ${{inputs.swap-size}}
       - name: Build Wasm binaries
         run: |-
           while read -r grammar_dir; do
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0a7363a..0d4048b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,6 +14,14 @@ on:
         description: The tree-sitter ABI version
         default: 15
         type: number
+      swap-size:
+        description: >
+          Resize the runner swap space before the Wasm build.
+          Set to a size such as "64G" to allocate that much swap, or leave
+          as "normal" (the default) to skip the resize entirely.
+          Useful for grammars whose Wasm compilation exceeds available memory.
+        default: normal
+        type: string
 
 permissions:
   contents: write
@@ -54,6 +62,17 @@ jobs:
           done < <(jq -r '.grammars[].path // "."' tree-sitter.json)
         env:
           TREE_SITTER_ABI_VERSION: ${{inputs.abi-version}}
+      - name: Increase swap space
+        if: inputs.swap-size != 'normal'
+        run: |
+          sudo swapoff -a
+          sudo fallocate -l "$SWAP_SIZE" /swapfile
+          sudo chmod 600 /swapfile
+          sudo mkswap /swapfile
+          sudo swapon /swapfile
+          sudo swapon --show
+        env:
+          SWAP_SIZE: ${{inputs.swap-size}}
       - name: Build Wasm binaries
         shell: bash
         run: |-