Reproduction for TypeScript memory usage issue.

node run.js

This repository:

Large Project:

Property	v5.3.3	v5.4.5	Diff	Diff %
Files	8823	9330	+507	5.7%
Lines of Library	37748	38041	+293	0.7%
Lines of Definitions	204088	329819	+125731	61.6%
Lines of TypeScript	1126416	1126416	0	0%
Lines of JavaScript	276	1761	+1485	538.0%
Lines of JSON	0	0	0	0%
Lines of Other	0	0	0	0%
Identifiers	1640769	1771163	+130394	7.9%
Symbols	2081369	2140374	+59005	2.8%
Types	567044	574305	+7261	1.2%
Instantiations	2186559	2229199	+42640	1.9%
Memory used	2338983K	8332631K	+5993648	256.2%
Assignability cache size	268459	271481	+3022	1.1%
Identity cache size	16564	16580	+16	0.09%
Subtype cache size	45773	45812	+39	0.08%
Strict subtype cache size	87667	87687	+20	0.02%
I/O Read time	7.63s	6.19s	-1.44	-18.8%
Parse time	5.68s	6.08s	+0.4	7.0%
ResolveModule time	3.00s	3.37s	+0.37	12.3%
ResolveLibrary time	0.03s	0.04s	+0.01	33.3%
ResolveTypeReference time	0.03s	0.04s	+0.01	33.3%
Program time	25.59s	140.48s	+114.89	448.9%
Bind time	2.49s	3.23s	+0.74	29.7%
Check time	47.07s	55.12s	+8.05	17.1%
printTime time	0.00s	0.00s	0	0%
Emit time	0.00s	0.00s	0	0%
Total time	75.15s	198.84s	123.69	164.4%

reduckted/repro-typescript-memory-usage

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