Use single-line JS arrow functions where possible. NFC (#22965)

Author: sbc100

src/library.js

@@ -393,13 +393,12 @@ addToLibrary({
   // Used to implement the native `abort` symbol.  Note that we use the
   // JavaScript `abort` helper in order to implement this function, but we use a
   // distinct name here to avoid confusing the two.
-  _abort_js: () => {
+  _abort_js: () =>
 #if ASSERTIONS
-    abort('native code called abort()');
+    abort('native code called abort()'),
 #else
-    abort('');
+    abort(''),
 #endif
-  },
 #endif
 
   // This object can be modified by the user during startup, which affects
@@ -443,9 +442,8 @@ addToLibrary({
   // assert.h
   // ==========================================================================
 
-  __assert_fail: (condition, filename, line, func) => {
-    abort(`Assertion failed: ${UTF8ToString(condition)}, at: ` + [filename ? UTF8ToString(filename) : 'unknown filename', line, func ? UTF8ToString(func) : 'unknown function']);
-  },
+  __assert_fail: (condition, filename, line, func) =>
+    abort(`Assertion failed: ${UTF8ToString(condition)}, at: ` + [filename ? UTF8ToString(filename) : 'unknown filename', line, func ? UTF8ToString(func) : 'unknown function']),
 #endif
 
 #if STACK_OVERFLOW_CHECK >= 2
@@ -662,9 +660,7 @@ addToLibrary({
   $strError: (errno) => errno + '',
 #else
   $strError__deps: ['strerror', '$UTF8ToString'],
-  $strError: (errno) => {
-    return UTF8ToString(_strerror(errno));
-  },
+  $strError: (errno) => UTF8ToString(_strerror(errno)),
 #endif
 
 #if PROXY_POSIX_SOCKETS == 0
@@ -681,9 +677,8 @@ addToLibrary({
     }
     return (b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24)) >>> 0;
   },
-  $inetNtop4: (addr) => {
-    return (addr & 0xff) + '.' + ((addr >> 8) & 0xff) + '.' + ((addr >> 16) & 0xff) + '.' + ((addr >> 24) & 0xff)
-  },
+  $inetNtop4: (addr) =>
+    (addr & 0xff) + '.' + ((addr >> 8) & 0xff) + '.' + ((addr >> 16) & 0xff) + '.' + ((addr >> 24) & 0xff),
   $inetPton6__deps: ['htons', '$jstoi_q'],
   $inetPton6: (str) => {
     var words;
@@ -1724,9 +1719,7 @@ addToLibrary({
     return ___cxa_throw(ex, 0, 0);
   },
 
-  _Unwind_DeleteException: (ex) => {
-    err('TODO: Unwind_DeleteException');
-  },
+  _Unwind_DeleteException: (ex) => err('TODO: Unwind_DeleteException'),
 #endif
 
   // special runtime support
@@ -1743,29 +1736,28 @@ addToLibrary({
   },
 #endif
 
-  $getExecutableName: () => {
 #if MINIMAL_RUNTIME // MINIMAL_RUNTIME does not have a global runtime variable thisProgram
+  $getExecutableName: () => {
 #if ENVIRONMENT_MAY_BE_NODE
     if (ENVIRONMENT_IS_NODE && process.argv.length > 1) {
       return process.argv[1].replace(/\\/g, '/');
     }
 #endif
     return "./this.program";
+  },
 #else
-    return thisProgram || './this.program';
+  $getExecutableName: () => thisProgram || './this.program',
 #endif
-  },
 
-  $listenOnce: (object, event, func) => {
+  $listenOnce: (object, event, func) =>
 #if MIN_CHROME_VERSION < 55 || MIN_FIREFOX_VERSION < 50 // https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
     object.addEventListener(event, function handler() {
       func();
       object.removeEventListener(event, handler);
-    });
+    }),
 #else
-    object.addEventListener(event, func, { 'once': true });
+    object.addEventListener(event, func, { 'once': true }),
 #endif
-  },
 
   // Receives a Web Audio context plus a set of elements to listen for user
   // input events on, and registers a context resume() for them. This lets
@@ -1999,9 +1991,7 @@ addToLibrary({
   // Use program_invocation_short_name and program_invocation_name in compiled
   // programs. This function is for implementing them.
   _emscripten_get_progname__deps: ['$getExecutableName', '$stringToUTF8'],
-  _emscripten_get_progname: (str, len) => {
-    stringToUTF8(getExecutableName(), str, len);
-  },
+  _emscripten_get_progname: (str, len) => stringToUTF8(getExecutableName(), str, len),
 
   emscripten_console_log: (str) => {
 #if ASSERTIONS

src/library_browser.js

@@ -738,9 +738,7 @@ var LibraryBrowser = {
   },
 
   emscripten_set_canvas_size__proxy: 'sync',
-  emscripten_set_canvas_size: (width, height) => {
-    Browser.setCanvasSize(width, height);
-  },
+  emscripten_set_canvas_size: (width, height) => Browser.setCanvasSize(width, height),
 
   emscripten_get_canvas_size__proxy: 'sync',
   emscripten_get_canvas_size: (width, height, isFullscreen) => {

src/library_egl.js

@@ -146,15 +146,13 @@ var LibraryEGL = {
 
   // EGLAPI EGLBoolean EGLAPIENTRY eglGetConfigs(EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config);
   eglGetConfigs__proxy: 'sync',
-  eglGetConfigs: (display, configs, config_size, numConfigs) => {
-    return EGL.chooseConfig(display, 0, configs, config_size, numConfigs);
-  },
+  eglGetConfigs: (display, configs, config_size, numConfigs) =>
+    EGL.chooseConfig(display, 0, configs, config_size, numConfigs),
 
   // EGLAPI EGLBoolean EGLAPIENTRY eglChooseConfig(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config);
   eglChooseConfig__proxy: 'sync',
-  eglChooseConfig: (display, attrib_list, configs, config_size, numConfigs) => {
-    return EGL.chooseConfig(display, attrib_list, configs, config_size, numConfigs);
-  },
+  eglChooseConfig: (display, attrib_list, configs, config_size, numConfigs) =>
+    EGL.chooseConfig(display, attrib_list, configs, config_size, numConfigs),
 
   // EGLAPI EGLBoolean EGLAPIENTRY eglGetConfigAttrib(EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value);
   eglGetConfigAttrib__proxy: 'sync',

src/library_eventloop.js

@@ -515,14 +515,10 @@ LibraryJSEventLoop = {
   },
 
   emscripten_pause_main_loop__deps: ['$MainLoop'],
-  emscripten_pause_main_loop: () => {
-    MainLoop.pause();
-  },
+  emscripten_pause_main_loop: () => MainLoop.pause(),
 
   emscripten_resume_main_loop__deps: ['$MainLoop'],
-  emscripten_resume_main_loop: () => {
-    MainLoop.resume();
-  },
+  emscripten_resume_main_loop: () => MainLoop.resume(),
 
   _emscripten_push_main_loop_blocker__deps: ['$MainLoop'],
   _emscripten_push_main_loop_blocker: (func, arg, name) => {

src/library_html5.js

@@ -914,9 +914,8 @@ var LibraryHTML5 = {
 
   emscripten_set_devicemotion_callback_on_thread__proxy: 'sync',
   emscripten_set_devicemotion_callback_on_thread__deps: ['$registerDeviceMotionEventCallback'],
-  emscripten_set_devicemotion_callback_on_thread: (userData, useCapture, callbackfunc, targetThread) => {
-    return registerDeviceMotionEventCallback({{{ cDefs.EMSCRIPTEN_EVENT_TARGET_WINDOW }}}, userData, useCapture, callbackfunc, {{{ cDefs.EMSCRIPTEN_EVENT_DEVICEMOTION }}}, "devicemotion", targetThread);
-  },
+  emscripten_set_devicemotion_callback_on_thread: (userData, useCapture, callbackfunc, targetThread) =>
+    registerDeviceMotionEventCallback({{{ cDefs.EMSCRIPTEN_EVENT_TARGET_WINDOW }}}, userData, useCapture, callbackfunc, {{{ cDefs.EMSCRIPTEN_EVENT_DEVICEMOTION }}}, "devicemotion", targetThread),
 
   emscripten_get_devicemotion_status__proxy: 'sync',
   emscripten_get_devicemotion_status__deps: ['$JSEvents'],

src/library_html5_webgl.js

@@ -444,9 +444,8 @@ var LibraryHtml5WebGL = {
   },
 
   emscripten_is_webgl_context_lost__proxy: 'sync_on_webgl_context_handle_thread',
-  emscripten_is_webgl_context_lost: (contextHandle) => {
-    return !GL.contexts[contextHandle] || GL.contexts[contextHandle].GLctx.isContextLost(); // No context ~> lost context.
-  },
+  emscripten_is_webgl_context_lost: (contextHandle) =>
+    !GL.contexts[contextHandle] || GL.contexts[contextHandle].GLctx.isContextLost(), // No context ~> lost context.
 
   emscripten_webgl_get_supported_extensions__proxy: 'sync_on_current_webgl_context_thread',
   emscripten_webgl_get_supported_extensions__deps: ['$stringToNewUTF8'],

src/library_sdl.js

@@ -2936,9 +2936,7 @@ var LibrarySDL = {
   },
 
   Mix_VolumeMusic__proxy: 'sync',
-  Mix_VolumeMusic: (volume) => {
-    return SDL.setGetVolume(SDL.music, volume);
-  },
+  Mix_VolumeMusic: (volume) => SDL.setGetVolume(SDL.music, volume),
 
   Mix_LoadMUS_RW__deps: ['Mix_LoadWAV_RW'],
   Mix_LoadMUS_RW: (filename) => _Mix_LoadWAV_RW(filename, 0),
@@ -3019,9 +3017,7 @@ var LibrarySDL = {
   Mix_FadeOutMusic: 'Mix_HaltMusic', // XXX ignore fading out effect
 
   Mix_PlayingMusic__proxy: 'sync',
-  Mix_PlayingMusic: () => {
-    return (SDL.music.audio && !SDL.music.audio.paused) ? 1 : 0;
-  },
+  Mix_PlayingMusic: () => (SDL.music.audio && !SDL.music.audio.paused),
 
   // http://www.libsdl.org/projects/SDL_mixer/docs/SDL_mixer_38.html#SEC38
   // "Note: Does not check if the channel has been paused."
@@ -3346,9 +3342,8 @@ var LibrarySDL = {
   },
 
   SDL_GL_SwapBuffers__proxy: 'sync',
-  SDL_GL_SwapBuffers: () => {
-    Browser.doSwapBuffers?.(); // in workers, this is used to send out a buffered frame
-  },
+  // in workers, this is used to send out a buffered frame
+  SDL_GL_SwapBuffers: () => Browser.doSwapBuffers?.(),
 
   // SDL 2
 
@@ -3382,9 +3377,7 @@ var LibrarySDL = {
   },
 
   SDL_GL_SetSwapInterval__deps: ['emscripten_set_main_loop_timing'],
-  SDL_GL_SetSwapInterval: (state) => {
-    _emscripten_set_main_loop_timing({{{ cDefs.EM_TIMING_RAF }}}, state);
-  },
+  SDL_GL_SetSwapInterval: (state) => _emscripten_set_main_loop_timing({{{ cDefs.EM_TIMING_RAF }}}, state),
 
   SDL_SetWindowTitle__proxy: 'sync',
   SDL_SetWindowTitle: (window, title) => {

src/library_sockfs.js

@@ -754,27 +754,21 @@ addToLibrary({
     SOCKFS.on(event, callback ? _callback : null);
   },
   emscripten_set_socket_error_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_error_callback: (userData, callback) => {
-    _setNetworkCallback('error', userData, callback);
-  },
+  emscripten_set_socket_error_callback: (userData, callback) =>
+    _setNetworkCallback('error', userData, callback),
   emscripten_set_socket_open_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_open_callback: (userData, callback) => {
-    _setNetworkCallback('open', userData, callback);
-  },
+  emscripten_set_socket_open_callback: (userData, callback) =>
+    _setNetworkCallback('open', userData, callback),
   emscripten_set_socket_listen_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_listen_callback: (userData, callback) => {
-    _setNetworkCallback('listen', userData, callback);
-  },
+  emscripten_set_socket_listen_callback: (userData, callback) =>
+    _setNetworkCallback('listen', userData, callback),
   emscripten_set_socket_connection_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_connection_callback: (userData, callback) => {
-    _setNetworkCallback('connection', userData, callback);
-  },
+  emscripten_set_socket_connection_callback: (userData, callback) =>
+    _setNetworkCallback('connection', userData, callback),
   emscripten_set_socket_message_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_message_callback: (userData, callback) => {
-    _setNetworkCallback('message', userData, callback);
-  },
+  emscripten_set_socket_message_callback: (userData, callback) =>
+    _setNetworkCallback('message', userData, callback),
   emscripten_set_socket_close_callback__deps: ['$_setNetworkCallback'],
-  emscripten_set_socket_close_callback: (userData, callback) => {
-    _setNetworkCallback('close', userData, callback);
-  }
+  emscripten_set_socket_close_callback: (userData, callback) =>
+    _setNetworkCallback('close', userData, callback),
 });

src/library_strings.js

@@ -383,9 +383,7 @@ addToLibrary({
 
   // Returns the number of bytes the given Javascript string takes if encoded as
   // a UTF16 byte array, EXCLUDING the null terminator byte.
-  $lengthBytesUTF16: (str) => {
-    return str.length*2;
-  },
+  $lengthBytesUTF16: (str) => str.length*2,
 
   $UTF32ToString: (ptr, maxBytesToRead) => {
 #if ASSERTIONS

src/library_syscall.js

@@ -821,9 +821,7 @@ var SyscallsLibrary = {
   },
   __syscall_fadvise64__nothrow: true,
   __syscall_fadvise64__proxy: 'none',
-  __syscall_fadvise64: (fd, offset, len, advice) => {
-    return 0; // your advice is important to us (but we can't use it)
-  },
+  __syscall_fadvise64: (fd, offset, len, advice) => 0,
   __syscall_openat__deps: ['$syscallGetVarargI'],
   __syscall_openat: (dirfd, path, flags, varargs) => {
     path = SYSCALLS.getStr(path);