feat(install): option to disable fast reinstall (#8977)

.changeset/neat-bobcats-raise.md

@@ -0,0 +1,7 @@
+---
+"@pnpm/plugin-commands-installation": minor
+"@pnpm/config": minor
+"pnpm": minor
+---
+
+Added a new setting called `optimistic-repeat-install`. When enabled, a fast check will be performed before proceeding to installation. This way a repeat install or an install on a project with everything up-to-date becomes a lot faster. But some edge cases might arise, so we keep it disabled by default for now [#8977](https://github.com/pnpm/pnpm/pull/8977).

config/config/src/Config.ts

@@ -45,6 +45,7 @@ export interface Config {
   ignoreScripts?: boolean
   ignoreCompatibilityDb?: boolean
   includeWorkspaceRoot?: boolean
+  optimisticRepeatInstall?: boolean
   save?: boolean
   saveProd?: boolean
   saveDev?: boolean

config/config/src/index.ts

@@ -147,6 +147,7 @@ export async function getConfig (opts: {
     'hoist-workspace-packages': true,
     'ignore-workspace-cycles': false,
     'ignore-workspace-root-check': false,
+    'optimistic-repeat-install': false,
     'inject-workspace-packages': false,
     'link-workspace-packages': false,
     'lockfile-include-tarball-url': false,

config/config/src/types.ts

@@ -42,6 +42,7 @@ export const types = Object.assign({
   'ignore-workspace': Boolean,
   'ignore-workspace-cycles': Boolean,
   'ignore-workspace-root-check': Boolean,
+  'optimistic-repeat-install': Boolean,
   'include-workspace-root': Boolean,
   'inject-workspace-packages': Boolean,
   'legacy-dir-filtering': Boolean,

pkg-manager/plugin-commands-installation/src/install.ts

@@ -29,6 +29,7 @@ export function rcOptionsTypes (): Record<string, unknown> {
     'https-proxy',
     'ignore-pnpmfile',
     'ignore-scripts',
+    'optimistic-repeat-install',
     'link-workspace-packages',
     'lockfile-dir',
     'lockfile-directory',
@@ -114,6 +115,10 @@ For options that may be used with `-r`, see "pnpm help recursive"',
             name: '--dev',
             shortAlias: '-D',
           },
+          {
+            description: 'Skip reinstall if the workspace state is up-to-date',
+            name: '--optimistic-repeat-install',
+          },
           {
             description: '`optionalDependencies` are not installed',
             name: '--no-optional',

pkg-manager/plugin-commands-installation/src/installDeps.ts

@@ -65,6 +65,7 @@ export type InstallDepsOptions = Pick<Config,
 | 'ignoreCurrentPrefs'
 | 'ignorePnpmfile'
 | 'ignoreScripts'
+| 'optimisticRepeatInstall'
 | 'linkWorkspacePackages'
 | 'lockfileDir'
 | 'lockfileOnly'
@@ -138,7 +139,7 @@ export async function installDeps (
   opts: InstallDepsOptions,
   params: string[]
 ): Promise<void> {
-  if (!opts.update && !opts.dedupe && params.length === 0) {
+  if (!opts.update && !opts.dedupe && params.length === 0 && opts.optimisticRepeatInstall) {
     const { upToDate } = await checkDepsStatus({
       ...opts,
       ignoreFilteredInstallCache: true,