Ignore unknown command line arguments

packages/size-limit/parse-args.js

@@ -38,7 +38,7 @@ module.exports = function parseArgs (plugins, argv) {
     } else if (arg[0] !== '-') {
       args.files.push(arg)
     } else if (arg !== '--json') {
-      throw new SizeLimitError('unknownArg', arg)
+      ++i
     }
   }
   return args

packages/size-limit/size-limit-error.js

@@ -2,8 +2,6 @@ const MESSAGES = {
   noPackage: () =>
     'Size Limit didn’t find *package.json*. ' +
     'Create npm package and run Size Limit there.',
-  unknownArg: arg =>
-    `Unknown argument *${arg}*. Check command for typo and read docs.`,
   argWithoutWebpack: arg =>
     `Argument *--${arg}* works only with *@size-limit/webpack* plugin` +
     (arg === 'why' ? '. You can add Bundle Analyzer to you own bundler.' : ''),

packages/size-limit/test/__snapshots__/run.test.js.snap

@@ -426,12 +426,6 @@ exports[`run throws on time limit without time plugin 1`] = `
 "
 `;
 
-exports[`run throws on unknown argument 1`] = `
-" ERROR  Unknown argument --unknown.
-        Check command for typo and read docs.
-"
-`;
-
 exports[`run throws on unknown option 1`] = `
 " ERROR  Unknown option unknown in config.
         Check Size Limit docs and version.
@@ -534,3 +528,14 @@ exports[`run works in integration test with time 1`] = `
 
 "
 `;
+
+exports[`run works in integration test with unknown arguments 1`] = `
+"  
+  Size limit:   200 B
+  Size:         31 B  with all dependencies, minified and gzipped
+  Loading time: 10 ms on slow 3G
+  Running time: 1 s   on Snapdragon 410
+  Total time:   1.1 s
+
+"
+`;

packages/size-limit/test/get-config.test.js

@@ -49,6 +49,29 @@ it('creates config by CLI arguments', async () => {
   })
 })
 
+it('creates config from command line with unknown arguments', async () => {
+  expect(
+    await check('file', [
+      '--unknown',
+      'unknown',
+      '--limit',
+      '10',
+      'a.js',
+      '/b.js'
+    ])
+  ).toEqual({
+    cwd: fixture('file'),
+    checks: [
+      {
+        name: 'a.js, /b.js',
+        limit: '10',
+        sizeLimit: 10,
+        files: [fixture('file', 'a.js'), '/b.js']
+      }
+    ]
+  })
+})
+
 it('supports globby and main field', async () => {
   expect(await check('globby')).toEqual({
     configPath: 'package.json',

packages/size-limit/test/run.test.js

@@ -147,8 +147,8 @@ describe(`run`, () => {
     expect(history.stderr).toMatchSnapshot()
   })
 
-  it('throws on unknown argument', async () => {
-    expect(await error('file', ['--unknown'])).toMatchSnapshot()
+  it('works in integration test with unknown arguments', async () => {
+    expect(await check('integration', ['--unknown'])).toMatchSnapshot()
   })
 
   it('throws on --save-bundle argument without webpack', async () => {