[解決済み] 1:1 エラー 構文解析エラーです。予期しない文字 '�' があります。

質問事項

私はjavascriptの初心者なので、愚かな質問であれば申し訳ありません。Firebase deployを実行しようとしているのですが、このようなエラーメッセージが表示されます。

  1:1  error  Parsing error: Unexpected character '�'

✖ 1 problem (1 error, 0 warnings)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] lint: `eslint .`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Tino\AppData\Roaming\npm-cache\_logs\2018-07-15T14_22_52_268Z-debug.log

Error: functions predeploy error: Command terminated with non-zero exit code1

私のindex.jsは次のようなものです。

const functions = require('firebase-functions');
// replaces keywords with emoji in the "text" key of messages
// pushed to /messages
exports.emojify =
    functions.database.ref('/messages/{pushId}/text')
    .onWrite(event => {
        // Database write events include new, modified, or deleted
        // database nodes. All three types of events at the specific
        // database path trigger this cloud function.
        // For this function we only want to emojify new database nodes,
        // so we'll first check to exit out of the function early if
        // this isn't a new message.

        // !event.data.val() is a deleted event
        // event.data.previous.val() is a modified event
        if (!event.data.val() || event.data.previous.val()) {
            console.log("not a new write event");
            return;
        }

        // Now we begin the emoji transformation
        console.log("emojifying!");

        // Get the value from the 'text' key of the message
        const originalText = event.data.val();
        const emojifiedText = emojifyText(originalText);

        // Return a JavaScript Promise to update the database node
        return event.data.ref.set(emojifiedText);
    });

// Returns text with keywords replaced by emoji
// Replacing with the regular expression /.../ig does a case-insensitive
// search (i flag) for all occurrences (g flag) in the string
function emojifyText(text) {
    var emojifiedText = text;
    emojifiedText = emojifiedText.replace(/\blol\b/ig, ":D");
    emojifiedText = emojifiedText.replace(/\bcat\b/ig, ":D(cat)");
    return emojifiedText;
}

そして、C: \UsersTino⇄AppData⇄Roaming⇄npm-cache_logs2018-07-15T14_22_52_268Z-debug.log の完全ログは次のようになります。

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   '--prefix',
1 verbose cli   'C:\\Users\\Tino\\Desktop\\FriendlyChatFunctions\\functions',
1 verbose cli   'run',
1 verbose cli   'lint' ]
2 info using [email protected]
3 info using [email protected]
4 verbose run-script [ 'prelint', 'lint', 'postlint' ]
5 info lifecycle [email protected]~prelint: [email protected]
6 info lifecycle [email protected]~lint: [email protected]
7 verbose lifecycle [email protected]~lint: unsafe-perm in lifecycle true
8 verbose lifecycle [email protected]~lint: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\Users\Tino\Desktop\FriendlyChatFunctions\functions\node_modules\.bin;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\sqlite;C:\Users\Tino\putty\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Brackets\command;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\nodejs\;C:\Program Files\Java\jre-9.0.4\bin;C:\Users\Tino\AppData\Local\Microsoft\WindowsApps;C:\Users\Tino\AppData\Roaming\npm
9 verbose lifecycle [email protected]~lint: CWD: C:\Users\Tino\Desktop\FriendlyChatFunctions\functions
10 silly lifecycle [email protected]~lint: Args: [ '/d /s /c', 'eslint .' ]
11 silly lifecycle [email protected]~lint: Returned: code: 1  signal: null
12 info lifecycle [email protected]~lint: Failed to exec lint script
13 verbose stack Error: [email protected] lint: `eslint .`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:285:16)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at EventEmitter.emit (events.js:214:7)
13 verbose stack     at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at ChildProcess.emit (events.js:214:7)
13 verbose stack     at maybeClose (internal/child_process.js:925:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
14 verbose pkgid [email protected]
15 verbose cwd C:\Users\Tino\Desktop\FriendlyChatFunctions
16 verbose Windows_NT 10.0.17134
17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "--prefix" "C:\\Users\\Tino\\Desktop\\FriendlyChatFunctions\\functions" "run" "lint"
18 verbose node v8.11.3
19 verbose npm  v5.6.0
20 error code ELIFECYCLE
21 error errno 1
22 error [email protected] lint: `eslint .`
22 error Exit status 1
23 error Failed at the [email protected] lint script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

コードはチュートリアル（2年前）からコピーペーストされているので、何が間違っている可能性があるかわかりません。

解決方法は？

次のようになります。 UTF-8 BOM をファイルの冒頭に追加してください。

notepad++の場合は、"Encoding" -> "BOMなしでUTF-8に変換"をクリックすると削除することができます。

BOMについてもっと読む