Allow to configure what files to exclude from transformation in the locales folder

Author: cibernox

Diff for: sveltekit-plugin.cjs

@@ -25,8 +25,6 @@ const transformYaml = async (content, { filename }) => {
 	return `export default ${JSON.stringify(load(content, { filename }))}`;
 }
 
-const languageFileRegex = /^[[a-z]{2}(-[a-zA-Z]{2})?\.([a-z]+)$/;
-
 const stdTransformers = {
 	// order matters as it defines which extensions are tried first
 	// when looking for a matching file for a locale
@@ -45,6 +43,7 @@ const stdTransformers = {
 function svelteIntlPrecompile(localesRoot, prefixOrOptions) {
 	const {
 		prefix = '$locales',
+		exclude,
 		transformers: customTransformers,
 	} = typeof prefixOrOptions === 'string'
 		? { prefix: prefixOrOptions }
@@ -62,9 +61,9 @@ function svelteIntlPrecompile(localesRoot, prefixOrOptions) {
 		];
 
 		const availableLocales = [];
-		const filesInLocalesFolder = await fs.readdir(localesRoot)
-		// Only files named after standard language codes (e.g `en.json` or `en-US.json`) are valid.s
-		const languageFiles = filesInLocalesFolder.filter(name => languageFileRegex.test(name));
+		const filesInLocalesFolder = await fs.readdir(localesRoot);
+		const excludeFn = typeof exclude === 'function' ? exclude : (exclude instanceof RegExp ? (s) => exclude.test(s) : () => false);
+		const languageFiles = filesInLocalesFolder.filter(name => !excludeFn(name));
 
 		// add register calls for each found locale
 		for (const file of languageFiles) {

Diff for: sveltekit-plugin.d.ts

@@ -5,6 +5,7 @@ type Transformer = (
 
 interface Options {
   prefix?: string
+  exclude?: RegExp | ((filename: string) => boolean)
   transformers?: Record<string, Transformer>
 }
 

Diff for: sveltekit-plugin.js

@@ -23,8 +23,6 @@ const transformYaml = async (content, { filename }) => {
 	return `export default ${JSON.stringify(load(content, { filename }))}`;
 }
 
-const languageFileRegex = /^[[a-z]{2}(-[a-zA-Z]{2})?\.([a-z]+)$/;
-
 const stdTransformers = {
 	// order matters as it defines which extensions are tried first
 	// when looking for a matching file for a locale
@@ -61,8 +59,8 @@ function svelteIntlPrecompile(localesRoot, prefixOrOptions) {
 
 		const availableLocales = [];
 		const filesInLocalesFolder = await fs.readdir(localesRoot)
-		// Only files named after standard language codes (e.g `en.json` or `en-US.json`) are valid.s
-		const languageFiles = filesInLocalesFolder.filter(name => languageFileRegex.test(name));
+		const excludeFn = typeof exclude === 'function' ? exclude : (exclude instanceof RegExp ? (s) => exclude.test(s) : () => false);
+		const languageFiles = filesInLocalesFolder.filter(name => !excludeFn(name));
 
 		// add register calls for each found locale
 		for (const file of languageFiles) {