use the franc instaed of languageDetect

package-lock.json

@@ -2927,6 +2927,11 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "collapse-white-space": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/collapse-white-space/-/collapse-white-space-1.0.6.tgz",
+      "integrity": "sha512-jEovNnrhMuqyCcjfEJA56v0Xq8SkIoPKDyaHahwo3POf4qcSXqMYuwNcOTzp74vTsR9Tn08z4MxWqAhcekogkQ=="
+    },
     "collect-v8-coverage": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/collect-v8-coverage/-/collect-v8-coverage-1.0.1.tgz",
@@ -4178,6 +4183,14 @@
         "map-cache": "^0.2.2"
       }
     },
+    "franc-min": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/franc-min/-/franc-min-5.0.0.tgz",
+      "integrity": "sha512-xy7Iq7uNflbvNU+bkyYWtP+BOHWZle7kT9GM84gEV14b7/7sgq7M7Flf6v1XRflHAuHoshBMveWA6Q+kEXYeHQ==",
+      "requires": {
+        "trigram-utils": "^1.0.0"
+      }
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -7756,6 +7769,11 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
+    "n-gram": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/n-gram/-/n-gram-1.1.2.tgz",
+      "integrity": "sha512-mBTpWKp0NHdujHmxrskPg2jc108mjyMmVxHN1rZGK/ogTLi9O0debDIXlQPqotNELdNmVGtL4jr7SCig+4OWvQ=="
+    },
     "nan": {
       "version": "2.14.0",
       "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
@@ -9328,6 +9346,21 @@
         "punycode": "^2.1.0"
       }
     },
+    "trigram-utils": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/trigram-utils/-/trigram-utils-1.0.3.tgz",
+      "integrity": "sha512-UAhS1Ll21FtClVIzIN0I/SmGnJ+D08BOxX7Dl1penV8raC0ksf2dJkhNI6kU1Mj3uT86Bul12iMvxXquXSYSng==",
+      "requires": {
+        "collapse-white-space": "^1.0.0",
+        "n-gram": "^1.0.0",
+        "trim": "0.0.1"
+      }
+    },
+    "trim": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/trim/-/trim-0.0.1.tgz",
+      "integrity": "sha1-WFhUf2spB1fulczMZm+1AITEYN0="
+    },
     "ts-jest": {
       "version": "24.3.0",
       "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-24.3.0.tgz",

package.json

@@ -29,6 +29,7 @@
     "@actions/github": "^4.0.0",
     "@k3rn31p4nic/google-translate-api": "^1.1.1",
     "@octokit/webhooks": "^7.15.1",
+    "franc-min": "^5.0.0",
     "languagedetect": "^2.0.0"
   },
   "devDependencies": {

src/main.ts

@@ -4,6 +4,8 @@ import * as webhook from '@octokit/webhooks'
 import LanguageDetect from 'languagedetect'
 import translate from '@k3rn31p4nic/google-translate-api'
 
+let franc = require('franc-min')
+
 async function run(): Promise<void> {
   try {
     if (
@@ -72,14 +74,17 @@ async function run(): Promise<void> {
 }
 
 function detectIsEnglish(body: string): boolean | true {
-  const lngDetector = new LanguageDetect()
-  const detectResult = lngDetector.detect(body, 1)
-  if (detectResult === undefined || detectResult === null || detectResult.length !== 1) {
-    core.warning(`Can not detect the comment body: ${body}`)
+  // const lngDetector = new LanguageDetect()
+  // const detectResult = lngDetector.detect(body, 1)
+  const detectResult = franc(body)
+  if (detectResult === 'und' 
+  || detectResult === undefined 
+  || detectResult === null) {
+    core.warning(`Can not detect the undetermined comment body: ${body}`)
     return false
   }
-  core.info(`Detect comment body language result is: ${detectResult[0][0]}, similar sorce: ${detectResult[0][1]}`)
-  return detectResult.length === 1 && detectResult[0][0] === 'english'
+  core.info(`Detect comment body language result is: ${detectResult}`)
+  return detectResult === 'eng'
 }
 
 async function translateCommentBody(body: string, issue_user: string): Promise<string> {