$ esdoc -c esdoc.json
/usr/local/lib/node_modules/esdoc/out/src/Plugin/Plugin.js:67
            throw _iteratorError;
                  ^
Error: Cannot find module 'esdoc-es7-plugin'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Plugin._execHandler (/usr/local/lib/node_modules/esdoc/out/src/Plugin/Plugin.js:48:22)
    at Plugin.onStart (/usr/local/lib/node_modules/esdoc/out/src/Plugin/Plugin.js:76:12)
    at Function.generate (/usr/local/lib/node_modules/esdoc/out/src/ESDoc.js:96:35)
    at ESDocCLI.exec (/usr/local/lib/node_modules/esdoc/out/src/ESDocCLI.js:88:28)
    at Object.<anonymous> (/usr/local/lib/node_modules/esdoc/out/src/ESDocCLI.js:142:7)
    at Module._compile (module.js:460:26)