fix: add constants to index

[moog16]

realted #4225

[codecov-io]

Codecov Report

Merging #4455 into feat/typescript will increase coverage by <.01%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           feat/typescript    #4455      +/-   ##
===================================================
+ Coverage            99.05%   99.06%   +<.01%     
===================================================
  Files                  130      130              
  Lines                 6238     6290      +52     
  Branches               813      813              
===================================================
+ Hits                  6179     6231      +52     
  Misses                  58       58              
  Partials                 1        1

Impacted Files	Coverage Δ
packages/mdc-menu/index.ts	100% <100%> (ø)	⬆️
packages/mdc-tab/index.ts	100% <100%> (ø)	⬆️
packages/mdc-tabs/tab/index.ts	100% <100%> (ø)	⬆️
packages/mdc-grid-list/index.ts	100% <100%> (ø)	⬆️
packages/mdc-switch/index.ts	100% <100%> (ø)	⬆️
packages/mdc-list/index.ts	100% <100%> (ø)	⬆️
packages/mdc-textfield/icon/index.ts	100% <100%> (ø)	⬆️
packages/mdc-line-ripple/index.ts	100% <100%> (ø)	⬆️
packages/mdc-select/icon/index.ts	100% <100%> (ø)	⬆️
packages/mdc-ripple/index.ts	100% <100%> (ø)	⬆️
... and 25 more

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[mdc-web-bot]

All 624 screenshot tests passed for commit 8ead624 vs. feat/typescript! 💯🎉