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Edit: Compiler.php

<?php
/**
 * Utility for compiling PO data to MO AND JSON files
 */
class Loco_gettext_Compiler {

/**
     * @var Loco_api_WordPressFileSystem
     */
    private $fs;

/**
     * Target file group, where we're compiling to
     * @var Loco_fs_Siblings
     */
    private $files;

/**
     * @var Loco_mvc_ViewParams
     */
    private $progress;

/**
     * Whether to protect existing files during compilation (i.e. not overwrite them)
     * @var bool
     */
    private $keep = false;

/**
     * Construct with primary file (PO) being saved
     * @param Loco_fs_LocaleFile Localised PO file which may or may not exist yet
     */
    public function __construct( Loco_fs_LocaleFile $pofile ){
        $this->fs = new Loco_api_WordPressFileSystem;
        $this->files = new Loco_fs_Siblings($pofile);
        $this->progress = new Loco_mvc_ViewParams( array(
            'pobytes' => 0,
            'mobytes' => 0,
            'numjson' => 0,
        ) );
    }

/**
     * Set overwrite mode
     * @param bool whether to overwrite existing files during compilation
     * @return self
     */
    public function overwrite( $overwrite ){
        $this->keep = ! $overwrite;
        return $this;
    }

/**
     * @param Loco_gettext_Data
     * @param Loco_package_Project|null
     * @return self
     */
    public function writeAll( Loco_gettext_Data $po, Loco_package_Project $project = null ){
        $this->writePo($po);
        $this->writeMo($po);
        if( $project ){
            $this->writeJson($project,$po);
        }
        return $this;
    }

/**
     * @param Loco_gettext_Data PO data
     * @return int bytes written to PO file
     * @throws Loco_error_WriteException
     */
    public function writePo( Loco_gettext_Data $po ){
        $file = $this->files->getSource();
        // Perform PO file backup before overwriting an existing PO
        if( $file->exists() ){
            $backups = new Loco_fs_Revisions($file);
            $backup = $backups->rotate($this->fs);
            // debug backup creation only under cli or ajax. too noisy printing on screen
            if( $backup && ( loco_doing_ajax() || 'cli' === PHP_SAPI ) && $backup->exists() ){
                Loco_error_AdminNotices::debug( sprintf('Wrote backup: %s -> %s',$file->basename(),$backup->basename() ) );
            }
        }
        $this->fs->authorizeSave($file);
        $bytes = $file->putContents( $po->msgcat() );
        $this->progress['pobytes'] = $bytes;
        return $bytes;
    }

/**
     * @param Loco_gettext_Data PO data
     * @return int bytes written to MO file
     */
    public function writeMo( Loco_gettext_Data $po ){
        try {
            $file = $this->files->getBinary();
            $this->fs->authorizeSave($file);
            $bytes = $file->putContents( $po->msgfmt() );
            $this->progress['mobytes'] = $bytes;
        }
        catch( Exception $e ){
            Loco_error_AdminNotices::debug( $e->getMessage() );
            Loco_error_AdminNotices::warn( __('PO file saved, but MO file compilation failed','loco-translate') );
            $bytes = 0;
        }
        return $bytes;
    }

/**
     * @param Loco_package_Project Translation set, required to resolve script paths
     * @param Loco_gettext_Data PO data to export
     * @return Loco_fs_FileList All json files created
     */
    public function writeJson( Loco_package_Project $project, Loco_gettext_Data $po ){
        $domain = $project->getDomain()->getName();
        $pofile = $this->files->getSource();
        $jsons = new Loco_fs_FileList;
        // Allow plugins to dictate a single JSON file to hold all script translations for a text domain
        // authors will additionally have to filter at runtime on load_script_translation_file
        $path = apply_filters('loco_compile_single_json', '', $pofile->getPath(), $domain );
        if( is_string($path) && '' !== $path ){
            $refs = $po->splitRefs( $this->getJsExtMap() );
            if( array_key_exists('js',$refs) && $refs['js'] instanceof Loco_gettext_Data ){
                $jsonfile = new Loco_fs_File($path);
                try {
                    $this->writeFile( $jsonfile, $refs['js']->msgjed($domain,'*.js') );
                    $jsons->add($jsonfile);
                }
                catch( Loco_error_WriteException $e ){
                    Loco_error_AdminNotices::debug( $e->getMessage() );
                    Loco_error_AdminNotices::warn( sprintf(__('JSON compilation failed for %s','loco-translate'),$jsonfile->basename()) );
                }
            }
        }
        // continue as per default, generating multiple per-script JSON
        else {
            $base_dir = $project->getBundle()->getDirectoryPath();
            $buffer = array();
            /* @var Loco_gettext_Data $fragment */
            foreach( $po->exportRefs('\\.js') as $ref => $fragment ){
                // Reference could be source js, or minified version.
                // Some build systems may differ, but WordPress only supports this. See WP-CLI MakeJsonCommand.
                if( substr($ref,-7) === '.min.js' ) {
                    $min = $ref;
                    $src = substr($ref,-7).'.js';
                }
                else {
                    $src = $ref;
                    $min = substr($ref,0,-3).'.min.js';
                }
                // Try both script paths to check whether deployed script actually exists
                $found = false;
                foreach( array($min,$src) as $ref ){
                    // Hook into load_script_textdomain_relative_path like load_script_textdomain() does.
                    $url = $project->getBundle()->getDirectoryUrl().$ref;
                    $ref = apply_filters( 'load_script_textdomain_relative_path', $ref, $url );
                    if( ! is_string($ref) || '' === $ref ){
                        continue;
                    }
                    $file = new Loco_fs_File($ref);
                    $file->normalize($base_dir);
                    if( ! $file->exists() ){
                        continue;
                    }
                    // add .js strings to buffer for this json and merge if already present
                    if( array_key_exists($ref,$buffer) ){
                        $buffer[$ref]->concat($fragment);
                    }
                    else {
                        $buffer[$ref] = $fragment;
                    }
                    $found = true;
                    break;
                }
                // if neither exists in the bundle, this is a source path that will never be resolved at runtime
                if( ! $found ){
                    Loco_error_AdminNotices::debug( sprintf('Skipping JSON for %s; script not found in bundle',$ref) );
                }
            }
            // write all buffered fragments to their computed JSON paths
            foreach( $buffer as $ref => $fragment ) {
                $jsonfile = $pofile->cloneJson($ref);
                try {
                    $this->writeFile( $jsonfile, $fragment->msgjed($domain,$ref) );
                    $jsons->add($jsonfile);
                }
                catch( Loco_error_WriteException $e ){
                    Loco_error_AdminNotices::debug( $e->getMessage() );
                    Loco_error_AdminNotices::warn( sprintf(__('JSON compilation failed for %s','loco-translate'),$ref));
                }
            }
            $buffer = null;
        }
        // clean up redundant JSONs including if no JSONs were compiled
        if( Loco_data_Settings::get()->jed_clean ){
            foreach( $this->files->getJsons() as $path ){
                $jsonfile = new Loco_fs_File($path);
                if( ! $jsons->has($jsonfile) ){
                    try {
                        $jsonfile->unlink();
                    }
                    catch( Loco_error_WriteException $e ){
                        Loco_error_AdminNotices::debug('Unable to remove redundant JSON: '.$e->getMessage() );
                    }
                }
            }
        }
        $this->progress['numjson'] = $jsons->count();
        return $jsons;
    }

/**
     * Fetch compilation summary and raise most relevant success message
     * @return Loco_mvc_ViewParams
     */
    public function getSummary(){
        $pofile = $this->files->getSource();
        // Avoid calling this unless the initial PO save was successful
        if( ! $this->progress['pobytes'] || ! $pofile->exists() ){
            throw new LogicException('PO not saved');
        }
        // Summary for localised file includes MO+JSONs
        $mobytes = $this->progress['mobytes'];
        $numjson = $this->progress['numjson'];
        if( $mobytes && $numjson ){
            Loco_error_AdminNotices::success( __('PO file saved and MO/JSON files compiled','loco-translate') );
        }
        else if( $mobytes ){
            Loco_error_AdminNotices::success( __('PO file saved and MO file compiled','loco-translate') );
        }
        else {
            // translators: Where %s is either PO or POT
            Loco_error_AdminNotices::success( sprintf(__('%s file saved','loco-translate'),strtoupper($pofile->extension())) );
        }
        return $this->progress;
    }

/**
     * @return string[]
     */
    private function getJsExtMap(){
        $map = array('js'=>'js', 'jsx'=>'js');
        $exts = Loco_data_Settings::get()->jsx_alias;
        if( is_array($exts) && $exts ){
            foreach( $exts as $ext ){
                $map[$ext] = 'js';
            }
        }
        return $map;
    }

/**
     * @param Loco_fs_File $file
     * @param string Serialized JSON to write to given file
     * @return int bytes written
     */
    public function writeFile( Loco_fs_File $file, $data ){
        if( $this->keep && $file->exists() ){
            return 0;
        }
        $this->fs->authorizeSave($file);
        return $file->putContents($data);
    }

}

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