Add eslint & update README

.eslintrc

@@ -0,0 +1,6 @@
+{
+  "extends": "airbnb-base",
+  "rules": {
+    "no-underscore-dangle": 0
+  }
+}

.npmignore

@@ -1,2 +1,4 @@
+.eslintrc
+.github
 tests
 examples

README.md

@@ -1,6 +1,10 @@
 FFmpeg.js
 =========
 
+<p align="center">
+<a href="#"><img alt="Tesseract.js" src="https://github.com/naptha/tesseract.js/raw/master/docs/images/cover.png"></a>
+</p>
+
 A FFmpeg WebAssembly version built from scratch, you can learn how to do it from this series of stories: [Build FFmpeg WebAssembly version (=ffmpeg.js)](https://medium.com/@jeromewus/build-ffmpeg-webassembly-version-ffmpeg-js-part-1-preparation-ed12bf4c8fac).
 
 ---

package.json

@@ -7,7 +7,8 @@
     "example": "examples"
   },
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "lint": "eslint src"
   },
   "repository": {
     "type": "git",
@@ -26,5 +27,10 @@
   "homepage": "https://github.com/jeromewu/ffmpeg.js#readme",
   "dependencies": {
     "@ffmpeg/core": "^0.1.0"
+  },
+  "devDependencies": {
+    "eslint": "^6.1.0",
+    "eslint-config-airbnb-base": "^14.0.0",
+    "eslint-plugin-import": "^2.18.2"
   }
 }

src/constants/defaultArgs.js

@@ -1,6 +1,6 @@
 module.exports = [
-  './ffmpeg',       // args[0] is always binary path
+  './ffmpeg', // args[0] is always binary path
-  '-nostdin',       // Disable interaction mode
+  '-nostdin', // Disable interaction mode
   '-loglevel',
   'quiet',
 ];

src/load.js

@@ -1,8 +1,8 @@
-const { setModule } = require('./util/module');
 const FFmpegCore = require('@ffmpeg/core');
+const { setModule } = require('./util/module');
 
 module.exports = () => (
-  new Promise((resolve, reject) => {
+  new Promise((resolve) => {
     FFmpegCore()
       .then((Module) => {
         setModule(Module);

src/transcode.js

@@ -4,7 +4,7 @@ const getFFmpeg = require('./util/getFFmpeg');
 const strList2ptr = require('./util/strList2ptr');
 const defaultArgs = require('./constants/defaultArgs');
 
-module.exports = (inputPath, outputExt, options='') => {
+module.exports = (inputPath, outputExt, options = '') => {
   const Module = getModule();
   const data = new Uint8Array(fs.readFileSync(inputPath));
   const iPath = `file.${inputPath.split('.').pop()}`;

src/util/module.js

@@ -1,6 +1,6 @@
 let Module = null;
 
-exports.setModule = m => {
+exports.setModule = (m) => {
   Module = m;
 };
 

src/util/str2ptr.js

@@ -2,10 +2,10 @@ const { getModule } = require('./module');
 
 module.exports = (s) => {
   const Module = getModule();
-  const ptr = Module._malloc((s.length+1)*Uint8Array.BYTES_PER_ELEMENT);
+  const ptr = Module._malloc((s.length + 1) * Uint8Array.BYTES_PER_ELEMENT);
-  for (let i = 0; i < s.length; i++) {
+  for (let i = 0; i < s.length; i += 1) {
-    Module.setValue(ptr+i, s.charCodeAt(i), 'i8');
+    Module.setValue(ptr + i, s.charCodeAt(i), 'i8');
   }
-  Module.setValue(ptr+s.length, 0, 'i8');
+  Module.setValue(ptr + s.length, 0, 'i8');
   return ptr;
 };

src/util/strList2ptr.js

@@ -3,11 +3,11 @@ const str2ptr = require('./str2ptr');
 
 module.exports = (strList) => {
   const Module = getModule();
-  const listPtr = Module._malloc(strList.length*Uint32Array.BYTES_PER_ELEMENT);
+  const listPtr = Module._malloc(strList.length * Uint32Array.BYTES_PER_ELEMENT);
 
   strList.forEach((s, idx) => {
     const strPtr = str2ptr(s);
-    Module.setValue(listPtr + (4*idx), strPtr, 'i32');
+    Module.setValue(listPtr + (4 * idx), strPtr, 'i32');
   });
 
   return listPtr;