feat: handle --dry-run option in --flow=patch mode

README.md

@@ -80,7 +80,7 @@ Default fix strategy [has been changed](https://github.com/antongolub/yarn-audit
 |---|---|---|---|
 |`--flow` | Define how `yarn.lock` is modified. `convert` — to compose `npm audit fix` with two-way lockfile conversion (legacy flow). `patch` — to directly inject audit json data | `patch`
 |`--audit-level` | Include a vulnerability with a level as defined or higher. Supported values: low, moderate, high, critical | `low`
-|`--dry-run` | Get an idea of what audit fix will do | | ✔ |
+|`--dry-run` | Get an idea of what audit fix will do
 |`--force` | Have audit fix install semver-major updates to toplevel dependencies, not just semver-compatible ones | `false`
 |`--help/-h`| Print help message |
 |`--legacy-peer-deps` | Accept an incorrect (potentially broken) deps resolution |  | ✔

src/main/ts/flows.ts

@@ -37,7 +37,6 @@ export const patch: TFlow = {
   main: [
     ['Runtime digest', printRuntimeDigest],
     ['Preparing temp assets...', clear, createTempAssets, createSymlinks],
-    ['Generating package-lock.json from yarn.lock...', yarnLockToPkgLock],
     [
       'Patching yarn.lock with audit data...',
       patchLockfile,

src/main/ts/stages.ts

@@ -163,7 +163,11 @@ export const yarnImport: TCallback = ({ temp }) => {
   fs.writeFileSync(join(temp, 'yarn.lock'), yarnLockData)
 }
 
-export const syncLockfile: TCallback = ({ temp }) => {
+export const syncLockfile: TCallback = ({ temp, flags }) => {
+  if (flags.dryRun) {
+    return
+  }
+
   fs.copyFileSync(join(temp, 'yarn.lock'), 'yarn.lock')
 }
 
@@ -173,6 +177,10 @@ export const syncLockfile: TCallback = ({ temp }) => {
  * @return {void}
  */
 export const yarnInstall: TCallback = ({ cwd, flags }) => {
+  if (flags.dryRun) {
+    return
+  }
+
   invoke(
     getYarn(),
     [

src/test/ts/runner.ts

@@ -175,7 +175,13 @@ describe('yarn-audit-fix', () => {
       )
       expect(cp.spawnSync).toHaveBeenCalledWith(
         getYarn(),
-        ['install', '--update-checksums', '--verbose', '--registry', registryUrl],
+        [
+          'install',
+          '--update-checksums',
+          '--verbose',
+          '--registry',
+          registryUrl,
+        ],
         { cwd, stdio },
       )
       expect(fs.emptyDirSync).toHaveBeenCalledWith(expect.stringMatching(temp))