diff --git a/js/grunt/Gruntfile.js b/js/grunt/Gruntfile.js
index 3e1bb797..c0fdf4e1 100644
--- a/js/grunt/Gruntfile.js
+++ b/js/grunt/Gruntfile.js
@@ -12,11 +12,10 @@
 const assert = require( 'assert' );
 require( './checkNodeVersion' );
 const { spawn } = require( 'child_process' ); // eslint-disable-line require-statement-match
-const getPhetLibs = require( './getPhetLibs' );
 
 // TODO: Will ctrl-c correctly kill spawned tasks? https://github.com/phetsims/chipper/issues/1459
 
-// Allow other Gruntfiles to potentially handle exiting and errors differently`
+// Allow other Gruntfiles to potentially handle exiting and errors differently
 if ( !global.processEventOptOut ) {
 
   // See https://medium.com/@dtinth/making-unhandled-promise-rejections-crash-the-node-js-process-ffc27cfcc9dd for how
@@ -38,30 +37,23 @@ module.exports = function( grunt ) {
   assert( typeof repo === 'string' && /^[a-z]+(-[a-z]+)*$/u.test( repo ), 'repo name should be composed of lower-case characters, optionally with dashes used as separators' );
 
   // TODO: This is working well but should we use execute? Let's chat: https://github.com/phetsims/chipper/issues/1459
-  function wrapExecSync( line ) {
+  function execTask( taskFilename ) {
 
-    const command = line.split( ' ' )[ 0 ];
-    const args = line.split( ' ' ).slice( 1 );
+    // TODO switch to npx tsx, see https://github.com/phetsims/chipper/issues/1459 via npx ../chipper/node_modules/tsx
+    // TODO: test on windows, see https://github.com/phetsims/chipper/issues/1459
+    const command = 'node';
 
     return () => {
 
       const done = grunt.task.current.async();
       try {
-        const child = spawn( command, args, { stdio: [ 'inherit', 'pipe', 'pipe' ] } );
+        const child = spawn( command, [ `../chipper/js/grunt/tasks/${taskFilename}`, ...process.argv.slice( 2 ) ], { stdio: [ 'inherit', 'pipe', 'pipe' ] } );
 
-        // Stream stdout
-        child.stdout.on( 'data', data => {
-          process.stdout.write( data.toString() );
-        } );
-
-        // Stream stderr
-        child.stderr.on( 'data', data => {
-          process.stderr.write( data.toString() );
-        } );
+        child.stdout.on( 'data', data => process.stdout.write( data.toString() ) );
+        child.stderr.on( 'data', data => process.stderr.write( data.toString() ) );
 
         // Listen for the close event when the command finishes
         child.on( 'close', code => {
-
           done();
           if ( code !== 0 ) {
             grunt.fail.fatal( `Command failed with exit code ${code}` );
@@ -84,22 +76,22 @@ module.exports = function( grunt ) {
 
   // TODO: https://github.com/phetsims/chipper/issues/1459 running grunt requires that we register tasks, otherwise it fails out. Is that ok?
   grunt.registerTask( 'clean', 'Erases the build/ directory and all its contents, and recreates the build/ directory',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/clean.js --repo ${repo}` )
+    execTask( 'clean.js' )
   );
 
   grunt.registerTask( 'build-images', 'Build images only',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/build-images.js --repo ${repo}` )
+    execTask( 'build-images.js' )
   );
 
   grunt.registerTask( 'output-js', 'Outputs JS just for the specified repo',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/output-js.js --repo ${repo}` )
+    execTask( 'output-js.js' )
   );
   grunt.registerTask( 'output-js-project', 'Outputs JS for the specified repo and its dependencies',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/output-js-project.js --repos ${getPhetLibs( repo ).join( ',' )}` )
+    execTask( 'output-js-project.js' )
   );
 
   grunt.registerTask( 'output-js-all', 'Outputs JS for all repos',
-    wrapExecSync( 'node ../chipper/js/grunt/tasks/output-js-all.js' )
+    execTask( '-js-all.js' )
   );
 
   grunt.registerTask( 'build',
@@ -121,14 +113,13 @@ Minify-specific options:
  --minify.mangle=false - During uglification, it will not "mangle" variable names (where they get renamed to short constants to reduce file size.)
  --minify.beautify=true - After uglification, the source code will be syntax formatted nicely
  --minify.stripAssertions=false - During uglification, it will strip assertions.
- --minify.stripLogging=false - During uglification, it will not strip logging statements.
- `,
-    wrapExecSync( `node ../chipper/js/grunt/tasks/build.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+ --minify.stripLogging=false - During uglification, it will not strip logging statements.`,
+    execTask( 'build.js' )
   );
 
   grunt.registerTask( 'generate-used-strings-file',
     'Writes used strings to phet-io-sim-specific/ so that PhET-iO sims only output relevant strings to the API in unbuilt mode',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-used-strings-file.js --repo ${repo}` )
+    execTask( 'generate-used-strings-file.js' )
   );
 
   grunt.registerTask( 'build-for-server', 'meant for use by build-server only',
@@ -141,30 +132,30 @@ Minify-specific options:
 --fix: autofixable changes will be written to disk
 --chip-away: output a list of responsible devs for each repo with lint problems
 --repos: comma separated list of repos to lint in addition to the repo from running`,
-    wrapExecSync( `node ../chipper/js/grunt/tasks/lint.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+    execTask( 'lint.js' )
   );
 
   grunt.registerTask( 'lint-all', 'lint all js files that are required to build this repository (for the specified brands)',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/lint-all.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+    execTask( 'lint-all.js' )
   );
 
   grunt.registerTask( 'generate-development-html',
     'Generates top-level SIM_en.html file based on the preloads in package.json.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-development-html.js --repo ${repo}` )
+    execTask( 'generate-development-html.js' )
   );
 
   grunt.registerTask( 'generate-test-html',
     'Generates top-level SIM-tests.html file based on the preloads in package.json.  See https://github.com/phetsims/aqua/blob/main/doc/adding-unit-tests.md ' +
     'for more information on automated testing. Usually you should ' +
     'set the "generatedUnitTests":true flag in the sim package.json and run `grunt update` instead of manually generating this.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-test-html.js --repo ${repo}` )
+    execTask( 'generate-test-html.js' )
   );
 
   grunt.registerTask( 'generate-a11y-view-html',
     'Generates top-level SIM-a11y-view.html file used for visualizing accessible content. Usually you should ' +
     'set the "phet.simFeatures.supportsInteractiveDescription":true flag in the sim package.json and run `grunt update` ' +
     'instead of manually generating this.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-a11y-view.js --repo ${repo}` )
+    execTask( 'generate-a11y-view.js' )
   );
 
   grunt.registerTask( 'update', `
@@ -175,7 +166,7 @@ Updates the normal automatically-generated files for this repository. Includes:
   * simulations: generateREADME()
   * phet-io simulations: generate overrides file if needed
   * create the conglomerate string files for unbuilt mode, for this repo and its dependencies`,
-    wrapExecSync( `node ../chipper/js/grunt/tasks/update.js --repo ${repo}` )
+    execTask( 'update.js' )
   );
 
   // This is not run in grunt update because it affects dependencies and outputs files outside of the repo.
@@ -183,28 +174,27 @@ Updates the normal automatically-generated files for this repository. Includes:
     'To support locales=* in unbuilt mode, generate a conglomerate JSON file for each repo with translations in babel. Run on all repos via:\n' +
     '* for-each.sh perennial-alias/data/active-repos npm install\n' +
     '* for-each.sh perennial-alias/data/active-repos grunt generate-development-strings',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-development-strings.js --repo ${repo}` )
+    execTask( 'generate-development-strings.js' )
   );
 
   grunt.registerTask( 'published-README',
     'Generates README.md file for a published simulation.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/published-README.js --repo ${repo}` )
+    execTask( 'published-README.js' )
   );
 
   grunt.registerTask( 'unpublished-README',
     'Generates README.md file for an unpublished simulation.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/unpublished-README.js --repo ${repo}` )
+    execTask( 'unpublished-README.js' )
   );
 
   // TODO: https://github.com/phetsims/chipper/issues/1459 probably does not need to be here in grunt
   grunt.registerTask( 'sort-imports', 'Sort the import statements for a single file (if --file={{FILE}} is provided), or does so for all JS files if not specified',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/sort-imports.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+    execTask( 'sort-imports.js' )
   );
 
   // TODO: https://github.com/phetsims/chipper/issues/1459 probably does not need to be here in grunt
-  grunt.registerTask( 'commits-since',
-    'Shows commits since a specified date. Use --date=<date> to specify the date.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/commits-since.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` ) // TODO: Just need date, or take everything? See https://github.com/phetsims/chipper/issues/1459
+  grunt.registerTask( 'commits-since', 'Shows commits since a specified date. Use --date=<date> to specify the date.',
+    execTask( 'commits-since.js' )
   );
 
   // See reportMedia.js
@@ -215,7 +205,7 @@ Updates the normal automatically-generated files for this repository. Includes:
     '(1) incompatible-license (resource license not approved)\n' +
     '(2) not-annotated (license.json missing or entry missing from license.json)\n' +
     '(3) missing-file (entry in the license.json but not on the file system)',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/report-media.js --repo ${repo}` )
+    execTask( 'report-media.js' )
   );
 
   // see reportThirdParty.js
@@ -224,19 +214,17 @@ Updates the normal automatically-generated files for this repository. Includes:
     'Creates a report of third-party resources (code, images, sound, etc) used in the published PhET simulations by ' +
     'reading the license information in published HTML files on the PhET website. This task must be run from main.  ' +
     'After running this task, you must push sherpa/third-party-licenses.md.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/report-third-party.js --repo ${repo}` )
+    execTask( 'report-third-party.js' )
   );
 
   grunt.registerTask( 'modulify', 'Creates *.js modules for all images/strings/audio/etc in a repo',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/modulify.js --repo ${repo}` )
+    execTask( 'modulify.js' )
   );
 
   // Grunt task that determines created and last modified dates from git, and
   // updates copyright statements accordingly, see #403
-  grunt.registerTask(
-    'update-copyright-dates',
-    'Update the copyright dates in JS source files based on Github dates',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/update-copyright-dates.js --repo ${repo}` )
+  grunt.registerTask( 'update-copyright-dates', 'Update the copyright dates in JS source files based on Github dates',
+    execTask( 'update-copyright-dates.js' )
   );
 
   // TODO: https://github.com/phetsims/chipper/issues/1459 probably does not need to be here in grunt
@@ -277,7 +265,7 @@ Updates the normal automatically-generated files for this repository. Includes:
     '--stable - regenerate for all "stable sims" (see perennial/data/phet-io-api-stable/)\n' +
     '--temporary - outputs to the temporary directory\n' +
     '--transpile=false - skips the transpilation step. You can skip transpilation if a watch process is handling it.',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/generate-phet-io-api.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+    execTask( 'generate-phet-io-api.js' )
   );
 
   grunt.registerTask(
@@ -290,12 +278,12 @@ Updates the normal automatically-generated files for this repository. Includes:
     '--delta, by default a breaking-compatibility comparison is done, but --delta shows all changes\n' +
     '--temporary, compares API files in the temporary directory (otherwise compares to freshly generated APIs)\n' +
     '--compareBreakingAPIChanges - add this flag to compare breaking changes in addition to designed changes',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/compare-phet-io-api.js --repo ${repo} ${process.argv.slice( 2 ).join( ' ' )}` )
+    execTask( 'compare-phet-io-api.js' )
   );
 
   // TODO: https://github.com/phetsims/chipper/issues/1459 probably does not need to be here in grunt
   grunt.registerTask( 'profile-file-size', 'Profiles the file size of the built JS file for a given repo',
-    wrapExecSync( `node ../chipper/js/grunt/tasks/profile-file-size.js --repo ${repo}` )
+    execTask( 'profile-file-size.js' )
   );
 
   /**
diff --git a/js/grunt/tasks/build-images.js b/js/grunt/tasks/build-images.js
index 6c06a55c..8a46709a 100644
--- a/js/grunt/tasks/build-images.js
+++ b/js/grunt/tasks/build-images.js
@@ -4,7 +4,7 @@
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 const jimp = require( 'jimp' );
 const generateThumbnails = require( '../generateThumbnails' );
@@ -12,7 +12,7 @@ const generateTwitterCard = require( '../generateTwitterCard' );
 
 const brand = 'phet';
 
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 ( async () => {
   const buildDir = `../${repo}/build/${brand}`;
diff --git a/js/grunt/tasks/build.js b/js/grunt/tasks/build.js
index 10975ba5..d57a69a8 100644
--- a/js/grunt/tasks/build.js
+++ b/js/grunt/tasks/build.js
@@ -15,13 +15,13 @@ const getPhetLibs = require( '../getPhetLibs' );
 const phetTimingLog = require( '../../../../perennial-alias/js/common/phetTimingLog' );
 
 const grunt = require( 'grunt' );
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 const assert = require( 'assert' );
 const Transpiler = require( '../../common/Transpiler' );
 const getBrands = require( './getBrands' );
 const parseGruntOptions = require( './parseGruntOptions' );
 
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 // Initialize Grunt options with parsed arguments
 // Call this before getBrands
diff --git a/js/grunt/tasks/clean.js b/js/grunt/tasks/clean.js
index f99cfe2c..b06cefd8 100644
--- a/js/grunt/tasks/clean.js
+++ b/js/grunt/tasks/clean.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const buildDirectory = `../${repo}/build`;
 
diff --git a/js/grunt/tasks/commits-since.js b/js/grunt/tasks/commits-since.js
index 2475d239..f58abdc5 100644
--- a/js/grunt/tasks/commits-since.js
+++ b/js/grunt/tasks/commits-since.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 const parseGruntOptions = require( './parseGruntOptions' );
 
 // Initialize Grunt options with parsed arguments
diff --git a/js/grunt/tasks/compare-phet-io-api.js b/js/grunt/tasks/compare-phet-io-api.js
index 330fdac5..a99107f8 100644
--- a/js/grunt/tasks/compare-phet-io-api.js
+++ b/js/grunt/tasks/compare-phet-io-api.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const parseGruntOptions = require( './parseGruntOptions' );
 
diff --git a/js/grunt/tasks/generate-a11y-view-html.js b/js/grunt/tasks/generate-a11y-view-html.js
index a519e661..0f7f3561 100644
--- a/js/grunt/tasks/generate-a11y-view-html.js
+++ b/js/grunt/tasks/generate-a11y-view-html.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateA11yViewHTML = require( '../generateA11yViewHTML' );
 ( async () => {
diff --git a/js/grunt/tasks/generate-development-html.js b/js/grunt/tasks/generate-development-html.js
index 532ef428..ced6833c 100644
--- a/js/grunt/tasks/generate-development-html.js
+++ b/js/grunt/tasks/generate-development-html.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateDevelopmentHTML = require( '../generateDevelopmentHTML' );
 ( async () => {
diff --git a/js/grunt/tasks/generate-development-strings.js b/js/grunt/tasks/generate-development-strings.js
index ef68cefa..825644d2 100644
--- a/js/grunt/tasks/generate-development-strings.js
+++ b/js/grunt/tasks/generate-development-strings.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateDevelopmentStrings = require( '../../scripts/generateDevelopmentStrings' );
 const fs = require( 'fs' );
diff --git a/js/grunt/tasks/generate-phet-io-api.js b/js/grunt/tasks/generate-phet-io-api.js
index 04c01b37..1a57b2dd 100644
--- a/js/grunt/tasks/generate-phet-io-api.js
+++ b/js/grunt/tasks/generate-phet-io-api.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const formatPhetioAPI = require( '../../phet-io/formatPhetioAPI' );
 const getSimList = require( '../../common/getSimList' );
diff --git a/js/grunt/tasks/generate-test-html.js b/js/grunt/tasks/generate-test-html.js
index 9052559e..6d1de8b5 100644
--- a/js/grunt/tasks/generate-test-html.js
+++ b/js/grunt/tasks/generate-test-html.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateTestHTML = require( '../generateTestHTML' );
 ( async () => {
diff --git a/js/grunt/tasks/generate-used-strings-file.js b/js/grunt/tasks/generate-used-strings-file.js
index 4bb44dea..8b346b70 100644
--- a/js/grunt/tasks/generate-used-strings-file.js
+++ b/js/grunt/tasks/generate-used-strings-file.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const getPhetLibs = require( '../getPhetLibs' );
 const fs = require( 'fs' );
diff --git a/js/grunt/tasks/getRepo.js b/js/grunt/tasks/getRepo.js
new file mode 100644
index 00000000..9481649e
--- /dev/null
+++ b/js/grunt/tasks/getRepo.js
@@ -0,0 +1,20 @@
+// Copyright 2024, University of Colorado Boulder
+
+/**
+ * @author Sam Reid (PhET Interactive Simulations)
+ */
+const grunt = require( 'grunt' );
+const parseGruntOptions = require( './parseGruntOptions' );
+const assert = require( 'assert' );
+
+module.exports = () => {
+
+  grunt.option.init( parseGruntOptions() );
+
+  const packageObject = grunt.file.readJSON( 'package.json' );
+
+  const repo = grunt.option( 'repo' ) || packageObject.name;
+  assert( typeof repo === 'string' && /^[a-z]+(-[a-z]+)*$/u.test( repo ), 'repo name should be composed of lower-case characters, optionally with dashes used as separators' );
+
+  return repo;
+};
\ No newline at end of file
diff --git a/js/grunt/tasks/getRequiredArg.js b/js/grunt/tasks/getRequiredArg.js
deleted file mode 100644
index 19474477..00000000
--- a/js/grunt/tasks/getRequiredArg.js
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2024, University of Colorado Boulder
-
-/**
- * @author Sam Reid (PhET Interactive Simulations)
- */
-module.exports = argName => {
-  const args = process.argv.slice( 2 );
-  const argIndex = args.indexOf( argName );
-
-  // Ensure the argument is provided
-  if ( argIndex === -1 ) {
-    throw new Error( `No ${argName} argument provided.` );
-  }
-
-// Ensure a repository name is provided after --repo
-  const repo = args[ argIndex + 1 ];
-  if ( !repo ) {
-    throw new Error( 'Repository name missing. Usage: --repo <repository-name>' );
-  }
-
-  return repo;
-};
\ No newline at end of file
diff --git a/js/grunt/tasks/lint-all.js b/js/grunt/tasks/lint-all.js
index d769f8d0..f1c4ca17 100644
--- a/js/grunt/tasks/lint-all.js
+++ b/js/grunt/tasks/lint-all.js
@@ -1,6 +1,6 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 const getBrands = require( './getBrands' );
 const assert = require( 'assert' );
 
@@ -8,7 +8,7 @@ const assert = require( 'assert' );
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const lint = require( '../lint' );
 
diff --git a/js/grunt/tasks/lint.js b/js/grunt/tasks/lint.js
index 97b7711e..b5f5d0eb 100644
--- a/js/grunt/tasks/lint.js
+++ b/js/grunt/tasks/lint.js
@@ -4,10 +4,10 @@
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 const lint = require( '../lint' );
 
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const parseGruntOptions = require( './parseGruntOptions' );
 
diff --git a/js/grunt/tasks/modulify.js b/js/grunt/tasks/modulify.js
index 1ff8423f..3cc72047 100644
--- a/js/grunt/tasks/modulify.js
+++ b/js/grunt/tasks/modulify.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 // TODO: Name to avoid collision with other modulify? See https://github.com/phetsims/chipper/issues/1459
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const modulify = require( '../modulify' );
 const generateDevelopmentStrings = require( '../../scripts/generateDevelopmentStrings' );
diff --git a/js/grunt/tasks/output-js-project.js b/js/grunt/tasks/output-js-project.js
index 6f9bda5b..0e2b59c4 100644
--- a/js/grunt/tasks/output-js-project.js
+++ b/js/grunt/tasks/output-js-project.js
@@ -1,13 +1,15 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const grunt = require( 'grunt' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const Transpiler = require( '../../common/Transpiler' );
+const parseGruntOptions = require( './parseGruntOptions' );
 const transpiler = new Transpiler( { silent: true } );
 
-const repos = getRequiredArg( '--repos' );
+grunt.option.init( parseGruntOptions() );
+const repos = grunt.option( 'repos' );
 
 transpiler.transpileRepo( repos.split( ',' ) );
\ No newline at end of file
diff --git a/js/grunt/tasks/output-js.js b/js/grunt/tasks/output-js.js
index 7dd48df6..e4a88240 100644
--- a/js/grunt/tasks/output-js.js
+++ b/js/grunt/tasks/output-js.js
@@ -1,6 +1,6 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
@@ -8,6 +8,6 @@ const getRequiredArg = require( './getRequiredArg' );
 const Transpiler = require( '../../common/Transpiler' );
 const transpiler = new Transpiler( { silent: true } );
 
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 transpiler.transpileRepo( repo );
\ No newline at end of file
diff --git a/js/grunt/tasks/profile-file-size.js b/js/grunt/tasks/profile-file-size.js
index c21fb4d1..6ef11c6c 100644
--- a/js/grunt/tasks/profile-file-size.js
+++ b/js/grunt/tasks/profile-file-size.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const profileFileSize = require( '../grunt/profileFileSize' );
 
diff --git a/js/grunt/tasks/published-README.js b/js/grunt/tasks/published-README.js
index 4bbd092e..b6df3a49 100644
--- a/js/grunt/tasks/published-README.js
+++ b/js/grunt/tasks/published-README.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateREADME = require( './generateREADME' ); // used by multiple tasks
 ( async () => {
diff --git a/js/grunt/tasks/report-media.js b/js/grunt/tasks/report-media.js
index 11b76d99..8ce097be 100644
--- a/js/grunt/tasks/report-media.js
+++ b/js/grunt/tasks/report-media.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const reportMedia = require( '../reportMedia' );
 
diff --git a/js/grunt/tasks/sort-imports.js b/js/grunt/tasks/sort-imports.js
index fc845554..a67cb172 100644
--- a/js/grunt/tasks/sort-imports.js
+++ b/js/grunt/tasks/sort-imports.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const sortImports = require( '../sortImports' );
 
diff --git a/js/grunt/tasks/unpublished-README.js b/js/grunt/tasks/unpublished-README.js
index 6844a0c4..b54f37b6 100644
--- a/js/grunt/tasks/unpublished-README.js
+++ b/js/grunt/tasks/unpublished-README.js
@@ -1,11 +1,11 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateREADME = require( './generateREADME' ); // used by multiple tasks
 ( async () => {
diff --git a/js/grunt/tasks/update-copyright-dates.js b/js/grunt/tasks/update-copyright-dates.js
index d531b4e7..5a0c9a81 100644
--- a/js/grunt/tasks/update-copyright-dates.js
+++ b/js/grunt/tasks/update-copyright-dates.js
@@ -1,13 +1,13 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * TODO: https://github.com/phetsims/chipper/issues/1459 Grunt uses --brands=myBrands. But my parser was --brands myBrands. Equals sign probably broken.
  * TODO: https://github.com/phetsims/chipper/issues/1459 helpful CLI --help is only available in grunt, not in these mini tasks.
  * @author Sam Reid (PhET Interactive Simulations)
  */
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 ( async () => {
   const updateCopyrightDates = require( '../updateCopyrightDates' );
diff --git a/js/grunt/tasks/update.js b/js/grunt/tasks/update.js
index 82e57a00..820db3f6 100644
--- a/js/grunt/tasks/update.js
+++ b/js/grunt/tasks/update.js
@@ -1,12 +1,12 @@
 // Copyright 2024, University of Colorado Boulder
 
-const getRequiredArg = require( './getRequiredArg' );
+const getRepo = require( './getRepo' );
 
 /**
  * @author Sam Reid (PhET Interactive Simulations)
  */
 const grunt = require( 'grunt' );
-const repo = getRequiredArg( '--repo' );
+const repo = getRepo();
 
 const generateREADME = require( '../generateREADME' );
 const fs = require( 'fs' );