Fix a couple issues

Author: Seldaek

README.md

@@ -83,7 +83,7 @@ jobs:
     steps:
       - uses: composer/api-surface-check@main
         with:
-          # install-dependencies: true
+          # install-dependencies: false
           # paths: src/**/*.php
           # source-roots: src
           # include-internal: false

action.yml

@@ -90,13 +90,13 @@ runs:
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       with:
         ref: refs/pull/${{ steps.pr.outputs.number }}/head
-        fetch-depth: 0
+        fetch-depth: 1
         persist-credentials: false
 
     - name: Fetch base ref
       if: steps.pr.outputs.number
       shell: bash
-      run: git fetch --no-tags origin "${{ steps.pr.outputs.base-ref }}:refs/remotes/origin/${{ steps.pr.outputs.base-ref }}"
+      run: git fetch --no-tags --depth=1 origin "${{ steps.pr.outputs.base-ref }}:refs/remotes/origin/${{ steps.pr.outputs.base-ref }}"
 
     - name: Preflight scan
       id: preflight
@@ -123,7 +123,7 @@ runs:
       if: steps.pr.outputs.number && steps.preflight.outputs.should-run == 'true'
       shell: bash
       working-directory: ${{ github.action_path }}
-      run: composer install --no-interaction --no-progress --classmap-authoritative
+      run: composer install --no-dev --no-interaction --no-progress --classmap-authoritative
 
     - name: Install project dependencies
       id: project-deps

composer.json

@@ -16,6 +16,7 @@
     "autoload-dev": {
         "psr-4": {
             "Composer\\ApiSurfaceCheck\\Tests\\": "tests/"
-        }
+        },
+        "exclude-from-classmap": ["tests/fixtures/"]
     }
 }

scripts/detect.sh

@@ -40,7 +40,7 @@ mkdir -p "${OUTPUT_DIR}"
 
 # All files in scope (added, modified, or deleted) — snapshot.php will silently
 # ignore missing files, so we can pass the same list for both refs.
-mapfile -t changed_files < <(git diff "${BASE_REF}...HEAD" --diff-filter=AMD --name-only -- "${paths_array[@]}" || true)
+mapfile -t changed_files < <(git diff "${BASE_REF}..HEAD" --diff-filter=AMD --name-only -- "${paths_array[@]}" || true)
 
 # Filter out empty entries
 changed_files=("${changed_files[@]/#/}")

scripts/preflight.sh

@@ -29,7 +29,7 @@ done
 
 mkdir -p "$(dirname "${OUTPUT_FILE}")"
 
-diff_output=$(git diff "${BASE_REF}...HEAD" --unified=0 -- "${paths_array[@]}" 2>/dev/null || true)
+diff_output=$(git diff "${BASE_REF}..HEAD" --unified=0 -- "${paths_array[@]}" 2>/dev/null || true)
 
 if [[ -z "${diff_output}" ]]; then
     echo "false" > "${OUTPUT_FILE}"