Upgrade to TS 4.1

[cspotcode]

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[codecov]

Codecov Report

Merging #1157 (a6664b8) into master (f848983) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1157   +/-   ##
=======================================
  Coverage   79.60%   79.60%           
=======================================
  Files           7        7           
  Lines         711      711           
  Branches      158      158           
=======================================
  Hits          566      566           
  Misses         89       89           
  Partials       56       56           

Flag	Coverage Δ
node_10	76.11% <ø> (ø)
node_12_15	76.46% <ø> (ø)
node_12_16	76.46% <ø> (ø)
node_13	78.90% <ø> (ø)
node_14	78.90% <ø> (ø)
node_14_13_0	78.05% <ø> (ø)
node_15	78.90% <ø> (ø)
typescript_2_7	78.90% <ø> (ø)
typescript_latest	78.05% <ø> (ø)
typescript_next	78.05% <ø> (ø)
ubuntu	78.76% <ø> (ø)
windows	78.90% <ø> (ø)

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