Implement npm@4's prepublish behavior

src/cli/commands/install.js

@@ -693,6 +693,10 @@ export async function run(
   await wrapLifecycle(config, flags, async () => {
     const install = new Install(flags, config, reporter, lockfile);
     await install.init();
+
+    if (await config.hasLifecycleScript('prepublish')) {
+      reporter.warn(reporter.lang('prepublishOnInstall'));
+    }
   });
 }
 
@@ -707,5 +711,6 @@ export async function wrapLifecycle(config: Config, flags: Object, factory: () =
 
   if (!flags.production) {
     await config.executeLifecycleScript('prepublish');
+    await config.executeLifecycleScript('prepare');
   }
 }

src/cli/commands/publish.js

@@ -63,6 +63,8 @@ async function publish(
 
   // TODO this might modify package.json, do we need to reload it?
   await config.executeLifecycleScript('prepublish');
+  await config.executeLifecycleScript('prepublishOnly');
+  await config.executeLifecycleScript('prepare');
 
   // create body
   const root = {

src/config.js

@@ -279,6 +279,23 @@ export default class Config {
     }
   }
 
+  /**
+   * Returns whether the given lifecycle script is defined in the manifest.
+   * Always false when --ignore-scripts has been passed.
+   */
+
+  async hasLifecycleScript(commandName: string, cwd?: string): Promise<bool> {
+    if (this.ignoreScripts) {
+      return false;
+    } else {
+      const pkg = await this.readManifest(cwd || this.cwd);
+      if (!pkg.scripts) {
+        return false;
+      }
+      return commandName in pkg.scripts;
+    }
+  }
+
   /**
    * Generate an absolute temporary filename location based on the input filename.
    */

src/reporters/lang/en.js

@@ -215,6 +215,8 @@ const messages = {
   fetchBadHash: 'Bad hash. Expected $0 but got $1 ',
   fetchErrorCorrupt: '$0. Mirror tarball appears to be corrupt. You can resolve this by running:\n\n  $ rm -rf $1\n  $ yarn install',
   errorDecompressingTarball: '$0. Error decompressing $1, it appears to be corrupt.',
+
+  prepublishOnInstall: '`prepublish` on install is deprecated and will stop running in the future.',
 };
 
 export type LanguageKeys = $Keys<typeof messages>;