feat: parse Number flags (#1652)

Author: snitin315

packages/webpack-cli/__tests__/arg-parser.test.js

@@ -30,6 +30,12 @@ const basicOptions = [
         type: Boolean,
         description: 'boolean flag',
     },
+    {
+        name: 'num-flag',
+        usage: '--num-flag <value>',
+        type: Number,
+        description: 'number flag',
+    },
     {
         name: 'string-flag',
         usage: '--string-flag <value>',
@@ -98,16 +104,37 @@ describe('arg-parser', () => {
     });
 
     it('parses basic flags', () => {
-        const res = argParser(basicOptions, ['--bool-flag', '--string-flag', 'val'], true);
+        const res = argParser(basicOptions, ['--bool-flag', '--string-flag', 'val', '--num-flag', '100'], true);
         expect(res.unknownArgs.length).toEqual(0);
         expect(res.opts).toEqual({
             boolFlag: true,
+            numFlag: 100,
             stringFlag: 'val',
             stringFlagWithDefault: 'default-value',
         });
         expect(warnMock.mock.calls.length).toEqual(0);
     });
 
+    it('parses number flags', () => {
+        const res = argParser(basicOptions, ['--num-flag', '100'], true);
+        expect(res.unknownArgs.length).toEqual(0);
+        expect(res.opts).toEqual({
+            numFlag: 100,
+            stringFlagWithDefault: 'default-value',
+        });
+        expect(warnMock.mock.calls.length).toEqual(0);
+    });
+
+    it('parses number flags with = sign', () => {
+        const res = argParser(basicOptions, ['--num-flag=10'], true);
+        expect(res.unknownArgs.length).toEqual(0);
+        expect(res.opts).toEqual({
+            numFlag: 10,
+            stringFlagWithDefault: 'default-value',
+        });
+        expect(warnMock.mock.calls.length).toEqual(0);
+    });
+
     it('should not parse negated boolean flags which are not specified', () => {
         const res = argParser(basicOptions, ['--no-bool-flag'], true);
         expect(res.unknownArgs.includes('--no-bool-flag')).toBeTruthy();

packages/webpack-cli/lib/utils/arg-parser.js

@@ -45,6 +45,8 @@ function argParser(options, args, argsOnly = false, name = '', helpFunction = un
                 const multiArg = (value, previous = []) => previous.concat([value]);
                 parserInstance.option(flagsWithType, option.description, multiArg, option.defaultValue);
             }
+        } else if (option.type === Number) {
+            parserInstance.option(flagsWithType, option.description, Number, option.defaultValue);
         } else {
             // in this case the type is a parsing function
             if (option.type.length > 1) {