Fix crash when specifying categories alongside hidden languages

changelog.md

@@ -1,27 +1,37 @@
 # Changelog
 
+## 1.9.1
+*2021-08-29*
+- Fixed a crash occurring when using both the `categories` and `ignoreLanguages` options together.
+
 ## 1.9.0
-- Add `ignoreLanguages` option to configure which languages to ignore.
+*2021-08-29*
+- Added `ignoreLanguages` option to configure which languages to ignore.
 - Added alias `ignoreFiles` for option `ignore`.
 - Added CLI argument `--tree` to traverse the output tree to a specific object instead of logging the entire results.
 - Deprecated option `ignore` as it is now ambiguous.
 
 ## 1.8.2
+*2021-08-28*
 - Fixed known vendored files not being removed from output.
 
 ## 1.8.1
+*2021-08-28*
 - Fixed input folder paths being case sensitive.
 - Fixed dotfiles not showing up in the output.
 
 ## 1.8.0
+*2021-08-24*
 - Added support for the first argument to `analyse()` to be an array of paths.
 
 ## 1.7.1
+*2021-08-21*
 - Changed file paths specified in option `ignore` to remain hidden even when `keepVendored` is enabled.
 - Fixed file results not being listed when using globbed input.
 - Fixed command-line arguments not being fully normalised.
 
 ## 1.7.0
+*2021-08-19*
 - Added `categories` option to control which language categories (`data`, `markup`, `programming`, and/or `prose`) should be included in the output.
 - Fixed some files being incorrectly classified as binary.
 

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "linguist-js",
-	"version": "1.9.0",
+	"version": "1.9.1",
 	"description": "Analyse languages used in a folder. Powered by GitHub Linguist, although it doesn't need to be installed.",
 	"main": "dist/index.js",
 	"bin": {

readme.md

@@ -107,6 +107,9 @@ let { count, results, languages } = linguist(folder, options);
 
 ### Command-line
 
+CLI usage requires `commander`, which is marked as an optional dependency.
+If an error saying `Cannot find module 'commander'` is thrown, run `npm install commander --no-save`.
+
 ```
 linguist --analyze [<folder>] [<...options>]
 linguist --help

src/cli.ts

@@ -5,8 +5,6 @@ import { program } from 'commander';
 
 import linguist from './index';
 
-if (typeof program === 'undefined') throw `Dependency 'commander' is not installed.`;
-
 program
 	.name('linguist --analyze')
 	.usage('[<folder>] [<options...>]')

src/index.ts

@@ -202,7 +202,7 @@ async function analyse(input?: string | string[], opts: T.Options = {}): Promise
 		const categories: S.LanguageType[] = ['data', 'markup', 'programming', 'prose'];
 		const hiddenCategories = categories.filter(cat => !opts.categories!.includes(cat));
 		for (const [file, lang] of Object.entries(finalResults)) {
-			if (!hiddenCategories.some(cat => lang && langData[lang].type === cat)) continue;
+			if (!hiddenCategories.some(cat => lang && langData[lang]?.type === cat)) continue;
 			delete finalResults[file];
 			if (lang) delete languages.all[lang];
 		}