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tsserver: Cannot read property 'getCallSignatures' of undefined #25577

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@cevek

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@cevek

TypeScript Version: 3.0.0-dev.20180710

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Error processing request. Cannot read property 'getCallSignatures' of undefined
TypeError: Cannot read property 'getCallSignatures' of undefined
    at getCandidateInfo (/usr/local/lib/node_modules/typescript/lib/tsserver.js:98579:117)
    at Object.getSignatureHelpItems (/usr/local/lib/node_modules/typescript/lib/tsserver.js:98526:33)
    at Object.getSignatureHelpItems (/usr/local/lib/node_modules/typescript/lib/tsserver.js:111310:37)
    at IOSession.Session.getSignatureHelpItems (/usr/local/lib/node_modules/typescript/lib/tsserver.js:118765:62)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (/usr/local/lib/node_modules/typescript/lib/tsserver.js:117793:61)
    at /usr/local/lib/node_modules/typescript/lib/tsserver.js:119186:88
    at IOSession.Session.executeWithRequestId (/usr/local/lib/node_modules/typescript/lib/tsserver.js:119177:28)
    at IOSession.Session.executeCommand (/usr/local/lib/node_modules/typescript/lib/tsserver.js:119186:33)
    at IOSession.Session.onMessage (/usr/local/lib/node_modules/typescript/lib/tsserver.js:119206:35)
    at Interface.<anonymous> (/usr/local/lib/node_modules/typescript/lib/tsserver.js:120473:27)

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