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‎tools/dep_updaters/update-postject.sh‎
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@@ -77,6 +77,16 @@ jobs:
                 echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV
                 ./tools/update-undici.sh
               fi
+          - id: postject
+            subsystem: deps
+            label: dependencies
+            run: |
+              NEW_VERSION=$(npm view postject dist-tags.latest)
+              CURRENT_VERSION=$(node -p "require('./test/fixtures/postject-copy/node_modules/postject/package.json').version")
+              if [ "$NEW_VERSION" != "$CURRENT_VERSION" ]; then
+                echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV
+                ./tools/dep_updaters/update-postject.sh
+              fi
           - id: base64
             subsystem: deps
             label: dependencies
 
@@ -0,0 +1,23 @@
+# Maintaining postject
+
+The [postject](https://github.com/nodejs/postject) dependency is used for the
+[Single Executable strategic initiative](https://github.com/nodejs/single-executable).
+
+## Updating postject
+
+The `tools/dep_updaters/update-postject.sh` script automates the update of the
+postject source files.
+
+Check that Node.js still builds and tests.
+
+## Committing postject
+
+Add postject: `git add --all test/fixtures/postject-copy`
+
+Commit the changes with a message like:
+
+```text
+deps: update postject to 1.0.0-alpha.4
+
+Updated as described in doc/contributing/maintaining-postject.md.
+```
@@ -60,3 +60,23 @@ been created with the changes), do the following:
 3. Check that Node.js compiles without errors and the tests pass.
 4. Create a commit for the update and in the commit message include the
    important/relevant items from the changelog.
+
+## postject
+
+The `update-postject.sh` script downloads postject from the [npm package](http://npmjs.com/package/postject)
+and uses it to replace the contents of `test/fixtures/postject-copy`.
+
+In order to update, the following command can be run:
+
+```bash
+./tools/dep_updaters/update-postject.sh
+```
+
+Once the script has run (either manually, or by CI in which case a PR will have
+been created with the changes), do the following:
+
+1. Check the [changelog](https://github.com/nodejs/postject/releases/tag/v1.0.0-alpha.4)
+   for things that might require changes in Node.js.
+2. Check that Node.js compiles without errors and the tests pass.
+3. Create a commit for the update and in the commit message include the
+   important/relevant items from the changelog.
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# Shell script to update postject in the source tree to the latest release.
+
+# This script must be in the tools directory when it runs because it uses the
+# script source file path to determine directories to work in.
+
+set -ex
+
+cd "$( dirname "$0" )/../.." || exit
+rm -rf test/fixtures/postject-copy
+mkdir test/fixtures/postject-copy
+cd test/fixtures/postject-copy || exit
+
+ROOT="$PWD/../../.."
+[ -z "$NODE" ] && NODE="$ROOT/out/Release/node"
+[ -x "$NODE" ] || NODE=$(command -v node)
+NPM="$ROOT/deps/npm/bin/npm-cli.js"
+
+"$NODE" "$NPM" init --yes
+
+"$NODE" "$NPM" install --no-bin-links --ignore-scripts postject