Typescript: getCodeFixes＆CompletionEntryDetailで未定義のプロパティ「長さ」を読み取ることができません

TypeScriptバージョン： 2.6.0-dev.20171018

コード

次のようなa.tsファイルを作成します。

export const PI = 3.14;

次のようなb.tsファイルを作成します。

PI

予想される行動：

• PI（b.ts）に対してgetCodeFixesを呼び出すと、 import code fixesが返されます。
• PI（b.ts）の後に完了を開くと、 ComplentionEntryDetailはコードアクション、詳細などを返す必要があります

実際の動作：

2回の呼び出しgetCodeFixes 、 ComplentionEntryDetailはError processing request. Cannot read property 'length' of undefined失敗します

{
    "seq": 0,
    "type": "response",
    "command": "getCodeFixes",
    "request_seq": 640,
    "success": false,
    "message": "Error processing request. Cannot read property 'length' of undefined\nTypeError: Cannot read property 'length' of undefined\n    at Object.firstDefined (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:1322:34)\n    at tryGetModuleNameFromTypeRoots (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76001:23)\n    at getModuleSpecifierForNewImport (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:75943:17)\n    at getCodeActionForAddImport (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76131:20)\n    at getCodeActionForImport (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:75869:26)\n    at C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76221:60\n    at forEachExternalModule (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76238:21)\n    at getActionsForNonUMDImport (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76205:13)\n    at Object.getImportCodeActions [as getCodeActions] (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:76180:19)\n    at C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:74963:33\n    at Object.forEach (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:1312:30)\n    at Object.getFixes (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:74962:16)\n    at C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:80069:35\n    at Object.flatMap (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:1550:25)\n    at Object.getCodeFixesAtPosition (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:80067:23)\n    at IOSession.Session.getCodeFixes (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:86471:64)\n    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:85384:61)\n    at C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:86625:88\n    at IOSession.Session.executeWithRequestId (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:86616:28)\n    at IOSession.Session.executeCommand (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:86625:33)\n    at IOSession.Session.onMessage (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:86645:35)\n    at Interface.<anonymous> (C:\\Users\\azerr\\WS2\\___aa\\node_modules\\typescript\\lib\\tsserver.js:87818:27)\n    at emitOne (events.js:96:13)\n    at Interface.emit (events.js:188:7)\n    at Interface._onLine (readline.js:239:10)\n    at Interface.<anonymous> (readline.js:376:12)\n    at Array.forEach (native)\n    at Interface._normalWrite (readline.js:375:11)\n    at Socket.ondata (readline.js:107:10)\n    at emitOne (events.js:96:13)\n    at Socket.emit (events.js:188:7)\n    at readableAddChunk (_stream_readable.js:176:18)\n    at Socket.Readable.push (_stream_readable.js:134:10)\n    at Pipe.onread (net.js:548:20)"
}