Prevent version number update during development

postcss.config.mjs

@@ -10,6 +10,7 @@ import unopacity from 'postcss-unopacity'
 import unrgba from 'postcss-unrgba'
 
 import { pkg } from './config/index.js'
+import { isDev } from './tasks/helpers/task-arguments.mjs'
 
 /**
  * PostCSS config
@@ -61,17 +62,19 @@ export default ({ from = '', to = '', env = 'production' }) => {
   }
 
   // Add GOV.UK Frontend release version
-  config.plugins.push({
-    postcssPlugin: 'govuk-frontend-version',
-    Declaration: {
-      // Find CSS declaration for version, update value
-      // https://github.com/postcss/postcss/blob/main/docs/writing-a-plugin.md
-      // https://postcss.org/api/#declaration
-      '--govuk-frontend-version': (decl) => {
-        decl.value = `"${pkg.version}"`
+  if (!isDev) {
+    config.plugins.push({
+      postcssPlugin: 'govuk-frontend-version',
+      Declaration: {
+        // Find CSS declaration for version, update value
+        // https://github.com/postcss/postcss/blob/main/docs/writing-a-plugin.md
+        // https://postcss.org/api/#declaration
+        '--govuk-frontend-version': (decl) => {
+          decl.value = `"${pkg.version}"`
+        }
       }
-    }
-  })
+    })
+  }
 
   // Always minify CSS
   if (config.syntax !== scss) {

tasks/scripts.mjs

@@ -9,6 +9,7 @@ import { pkg } from '../config/index.js'
 import { getListing } from '../lib/file-helper.js'
 import { componentPathToModuleName } from '../lib/helper-functions.js'
 
+import { isDev } from './helpers/task-arguments.mjs'
 import { assets } from './index.mjs'
 
 /**
@@ -41,14 +42,16 @@ export async function compileJavaScript ([modulePath, { srcPath, destPath, fileP
   const moduleDestPath = join(destPath, filePath ? filePath(parse(modulePath)) : modulePath)
 
   // Rollup plugins
-  const plugins = [
+  const plugins = []
+
+  if (!isDev) {
     // Add GOV.UK Frontend release version
     // @ts-expect-error "This expression is not callable" due to incorrect types
-    replace({
+    plugins.push(replace({
       include: join(srcPath, 'common/govuk-frontend-version.mjs'),
       values: { development: pkg.version }
-    })
-  ]
+    }))
+  }
 
   // Option 1: Rollup bundle set (multiple files)
   // - Module imports are preserved, not concatenated