Fix lint error

src/browser/lang.js

@@ -1,76 +0,0 @@
-const leveljs = require('level-js')
-
-// something about trying to store these language files in indexedDB
-// causes iOS Safari to crash
-
-var iOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
-var noIDB = typeof indexedDB === 'undefined' || iOS;
-
-var db = noIDB ? { open: (_, cb) =>  cb(true) } : leveljs('./tessdata2')
-
-var langdata = require('../common/langdata.json')
-
-module.exports = function getLanguageData(req, res, cb){
-    var lang = req.options.lang;
-
-    function saveDataFile(data){
-        try {
-            db.put(lang, data, err => console.log('cached', lang, err))
-        } finally {
-            cb(data)    
-        }
-    }
-
-    db.open({ compression: false }, err => {
-        if (err) return fetchLanguageData(req, res, cb);
-        db.get(lang, (err, data) => {
-            if (err) return fetchLanguageData(req, res, saveDataFile);
-            res.progress({ status: 'found in cache ' + lang + '.traineddata' })
-            cb(data)
-        })
-    })
-}
-
-
-const ungzip = require('pako/lib/inflate.js').ungzip;
-
-function fetchLanguageData(req, res, cb){
-    var lang = req.options.lang;
-    var langfile = lang + '.traineddata.gz';
-    var url = req.workerOptions.langPath + langfile;
-
-    var xhr = new XMLHttpRequest();
-    xhr.open('GET', url, true);
-    xhr.responseType = 'arraybuffer';
-    xhr.onerror = e => {
-        xhr.onprogress = xhr.onload = null
-        cb(xhr, null)
-    }
-    xhr.onprogress = e => 
-        res.progress({
-            status: 'downloading ' + langfile,
-            loaded: e.loaded,
-            progress: Math.min(1, e.loaded / langdata[lang])
-        });
-
-    xhr.onload = e => {
-        if (!(xhr.status == 200 || (xhr.status == 0 && xhr.response))) return res.reject('Error downloading language ' + url);
-        res.progress({ status: 'unzipping ' + langfile, progress: 0 })
-
-        // in case the gzips are already ungzipped or extra gzipped
-        var response = new Uint8Array(xhr.response)
-        try {
-            var n = 2;
-            while(response[0] == 0x1f && response[1] == 0x8b){
-                response = ungzip(response);
-                res.progress({ status: 'unzipping ' + langfile, progress: 1 - 1 / (n++) })
-            }
-        } catch (err) {
-            return res.reject('Error unzipping language file ' + langfile + '\n' + err.message)
-        }
-        res.progress({ status: 'unzipping ' + langfile, progress: 1 })
-        
-        cb(response)
-    }
-    xhr.send()
-}

src/browser/worker.js

@@ -1,23 +1,20 @@
-const workerUtils = require('../common/worker.js')
+const workerUtils = require('../common/worker.js');
 
-if (process.env.NODE_ENV === "development") {
-    console.debug('Using Development Worker')
+if (process.env.NODE_ENV === 'development') {
+  console.debug('Using Development Worker');
 }
 
-global.addEventListener('message', function(e){
-    var packet = e.data;
-    workerUtils.dispatchHandlers(packet, obj => postMessage(obj))
-})
+global.addEventListener('message', ({ data }) => {
+  workerUtils.dispatchHandlers(data, obj => postMessage(obj));
+});
 
-exports.getCore = function(req, res){
-    if(!global.TesseractCore){
-        res.progress({ status: 'loading tesseract core', progress: 0 })
-        importScripts(req.workerOptions.corePath)
-        res.progress({ status: 'loading tesseract core', progress: 1 })
+workerUtils.setAdapter({
+  getCore: (req, res) => {
+    if (!global.TesseractCore) {
+      res.progress({ status: 'loading tesseract core', progress: 0 });
+      global.importScripts(req.workerOptions.corePath);
+      res.progress({ status: 'loading tesseract core', progress: 1 });
     }
-    return TesseractCore
-}
-
-exports.getLanguageData = require('./lang.js')
-
-workerUtils.setAdapter(module.exports);
+    return global.TesseractCore;
+  },
+});