feat: support disabling updates to lock files

- changes related to dylang#425

README.md

@@ -149,6 +149,7 @@ Install packages using `--save-exact`, meaning exact versions will be saved in p
 
 Applies to both `dependencies` and `devDependencies`.
 
+
 #### `--specials`
 
 Check special (e.g. config) files when looking for unused dependencies.
@@ -167,6 +168,10 @@ By default `npm-check` uses colors if they are available.
 
 Enable or disable emoji support. Useful for terminals that don't support them. Automatically disabled in CI servers.
 
+#### `--lock, --no-lock`
+
+Enable or disable lock file updates. Enabled by default.
+
 #### `--spinner, --no-spinner`
 
 Enable or disable the spinner. Useful for terminals that don't support them. Automatically disabled in CI servers.

lib/cli.js

@@ -36,6 +36,7 @@ const cli = meow(`
           --specials            List of depcheck specials to include in check for unused dependencies.
           --no-color            Force or disable color output.
           --no-emoji            Remove emoji support. No emoji in default in CI environments.
+          --no-lock             No updates will be made to lock files.
           --debug               Debug output. Throw in a gist when creating issues on github.
 
         Examples
@@ -87,6 +88,10 @@ const cli = meow(`
                 type: 'boolean',
                 default: !isCI
             },
+            lock: {
+                type: 'boolean',
+                default: true
+            },
             debug: {
                 type: 'boolean'
             },
@@ -110,6 +115,7 @@ const options = {
     saveExact: cli.flags.saveExact,
     specials: cli.flags.specials,
     emoji: cli.flags.emoji,
+    lockFile: cli.flags.lock,
     installer: process.env.NPM_CHECK_INSTALLER || 'auto',
     debug: cli.flags.debug,
     spinner: cli.flags.spinner,

lib/out/install-packages.js

@@ -16,12 +16,14 @@ function install(packages, currentState) {
 
     const installGlobal = currentState.get('global') ? (isYarn ? 'global' : '--global'): null;
     const saveExact = currentState.get('saveExact') ? (isYarn ? '--exact' : '--save-exact') : null;
+    const lockFile = !currentState.get('lockFile') ? (isYarn ? '--no-lockfile' : '--no-package-lock') : null;
 
     const installCmd = isYarn ? 'add' : 'install';
 
     const npmArgs = [installCmd]
         .concat(installGlobal)
         .concat(saveExact)
+        .concat(lockFile)
         .concat(packages)
         .concat(color)
         .filter(Boolean);

lib/state/state.js

@@ -17,6 +17,7 @@ const defaultOptions = {
     specials: '',
     debug: false,
     emoji: true,
+    lockFile: true,
     spinner: false,
     installer: 'npm',
     ignore: [],