1 view

vercel-labs/scriptc

TypeScript-to-Native Compiler

TypeScript★ 5,477+102 that day#4 on trending

Analyzed September 28, 2026 at 6aa732c (main) with jscpd 5.4.0 in 2.2s.

C57.9/100

Project health446,469 lines of code (L)

Duplication58

6.8% in typescript, c, javascript, c-header, tsx, bash, cpp, perl, python

Dead code100

Complexity39

69.1%

The score is jscpd's own --health model: markup, data and text left out, tests kept. The numbers below are the trending scan's.

4.32%duplicated code · 12,630 of 292,602 lines

1,246clones in code

311code files of 2,535 scanned

6.46%duplicated over all files · 2,218 clones

Most complex files

packages/compiler/src/frontend/lowering/lower-calls.ts3267 cx
packages/compiler/src/frontend/lowering/lower-exprs.ts2997 cx
packages/compiler/src/backend/c/exprs.ts2875 cx
packages/compiler/src/frontend/lowering/lower-builtins.ts2824 cx
packages/compiler/src/frontend/lowering/lowerer.ts2777 cx
packages/compiler/src/frontend/lowering/lower-stmts.ts2232 cx
packages/compiler/src/ir/validate.ts2179 cx
packages/runtime/src/scr_fetch.c1956 cx
packages/runtime/src/scr_http.c1757 cx
packages/runtime/src/scr_child.c1697 cx

Dead code 0.01% unused · 3 findings

packages/compiler/src/frontend/ts7/census-check.tsunused-file
packages/llvm-darwin-arm64/scripts/build.mjs:dirnameunused-import
packages/runtime-darwin-x64/scripts/build.mjs:joinunused-import

The code number leaves out tests, fixtures, docs, examples, data files, styles, translations and vendored code, and 2 generated files: packages/runtime/src/scr_island_manifest.h, packages/runtime/src/scr_text_decoder_data.h.

Largest clones in the code

7 lines in 23 placestypescript70 tokens

packages/compiler/src/ir/ir.ts:6510–6516packages/compiler/src/ir/ir.ts:6539–6545packages/compiler/src/ir/ir.ts:6566–6574packages/compiler/src/ir/ir.ts:6630–6636packages/compiler/src/ir/ir.ts:6653–6659and 18 more

6510if (found || v === null || typeof v !== "object") return;
6511if (Array.isArray(v)) {
6512  for (const item of v) visit(item);
6513  return;
6514}
6515const node = v as { kind?: unknown; fn?: unknown };
6516if (node.kind === "libCall" && typeof node.fn === "string" && PROCESS_EVENT_LIB_FNS.has(node.fn)) {

6539if (found || v === null || typeof v !== "object") return;
6540if (Array.isArray(v)) {
6541  for (const item of v) visit(item);
6542  return;
6543}
6544const node = v as { kind?: unknown; fn?: unknown };
6545if (node.kind === "libCall" && typeof node.fn === "string" && node.fn.startsWith("emitter.")) {

9 lines in 21 placestypescript66 tokens

packages/compiler/src/ir/ir.ts:6335–6343packages/compiler/src/ir/ir.ts:6372–6380packages/compiler/src/ir/ir.ts:6507–6515packages/compiler/src/ir/ir.ts:6650–6658packages/compiler/src/ir/ir.ts:6675–6683and 16 more

6335export function moduleUsesRegex(mod: IrModule): boolean {
6336  let found = false;
6337  const visit = (v: unknown): void => {
6338    if (found || v === null || typeof v !== "object") return;
6339    if (Array.isArray(v)) {
6340      for (const item of v) visit(item);
6341      return;
6342    }
6343    const kind = (v as { kind?: unknown }).kind;

6372export function moduleUsesCopying(mod: IrModule): boolean {
6373  let found = false;
6374  const visit = (v: unknown): void => {
6375    if (found || v === null || typeof v !== "object") return;
6376    if (Array.isArray(v)) {
6377      for (const item of v) visit(item);
6378      return;
6379    }
6380    const node = v as { kind?: unknown; method?: unknown };

7 lines in 21 placestypescript59 tokens

packages/compiler/src/ir/ir.ts:6374–6380packages/compiler/src/ir/ir.ts:6462–6468packages/compiler/src/ir/ir.ts:6509–6515packages/compiler/src/ir/ir.ts:6652–6658packages/compiler/src/ir/ir.ts:6677–6683and 16 more

6374const visit = (v: unknown): void => {
6375  if (found || v === null || typeof v !== "object") return;
6376  if (Array.isArray(v)) {
6377    for (const item of v) visit(item);
6378    return;
6379  }
6380  const node = v as { kind?: unknown; method?: unknown };

6462const visit = (v: unknown): void => {
6463  if (found || v === null || typeof v !== "object") return;
6464  if (Array.isArray(v)) {
6465    for (const item of v) visit(item);
6466    return;
6467  }
6468  const node = v as { kind?: unknown; op?: unknown; name?: unknown; fn?: unknown };

7 more

85 lines in 2 placesc813 tokens
packages/runtime/src/scr_child.c:1960–2044 packages/runtime/src/scr_child.c:4471–4555
14 lines in 15 placestypescript51 tokens
packages/compiler/src/ir/ir.ts:6359–6372 packages/compiler/src/ir/ir.ts:6397–6410 packages/compiler/src/ir/ir.ts:6440–6457 packages/compiler/src/ir/ir.ts:6583–6596 packages/compiler/src/ir/ir.ts:6755–6765and 10 more
51 lines in 2 placesc543 tokens
packages/runtime/src/scr_child.c:2359–2409 packages/runtime/src/scr_child.c:4947–4997
67 lines in 2 placesc529 tokens
packages/runtime/src/scr_child.c:1893–1959 packages/runtime/src/scr_child.c:4404–4470
24 lines in 3 placesc233 tokens
packages/runtime/src/scr_regex.c:714–737 packages/runtime/src/scr_regex.c:999–1012 packages/runtime/src/scr_string.c:494–517
9 lines in 9 placestypescript56 tokens
packages/compiler/src/ir/ir.ts:6567–6575 packages/compiler/src/ir/ir.ts:6791–6799 packages/compiler/src/ir/ir.ts:6826–6832 packages/compiler/src/ir/ir.ts:6925–6931 packages/compiler/src/ir/ir.ts:6956–6962and 4 more
6 lines in 9 placestypescript55 tokens
packages/compiler/src/ir/ir.ts:6540–6545 packages/compiler/src/ir/ir.ts:6631–6636 packages/compiler/src/ir/ir.ts:6654–6659 packages/compiler/src/ir/ir.ts:6679–6684 packages/compiler/src/ir/ir.ts:6769–6774and 4 more

Largest clones over all files, tests and data included

738 lines in 2 placesc-header26,511 tokens

packages/runtime/src/scr_text_decoder_data.h:4012–4749packages/runtime/src/scr_text_decoder_data.h:5492–6229

4012static const uint16_t scr_td_jis0208[94 * 94] = {
4013  0x3000, 0x3001, 0x3002, 0xff0c, 0xff0e, 0x30fb, 0xff1a, 0xff1b, 0xff1f, 0xff01, 0x309b, 0x309c,
4014  0x00b4, 0xff40, 0x00a8, 0xff3e, 0xffe3, 0xff3f, 0x30fd, 0x30fe, 0x309d, 0x309e, 0x3003, 0x4edd,
4015  0x3005, 0x3006, 0x3007, 0x30fc, 0x2015, 0x2010, 0xff0f, 0xff3c, 0xff5e, 0x2225, 0xff5c, 0x2026,
4016  0x2025, 0x2018, 0x2019, 0x201c, 0x201d, 0xff08, 0xff09, 0x3014, 0x3015, 0xff3b, 0xff3d, 0xff5b,
4017  0xff5d, 0x3008, 0x3009, 0x300a, 0x300b, 0x300c, 0x300d, 0x300e, 0x300f, 0x3010, 0x3011, 0xff0b,
4018  0xff0d, 0x00b1, 0x00d7, 0x00f7, 0xff1d, 0x2260, 0xff1c, 0xff1e, 0x2266, 0x2267, 0x221e, 0x2234,
4019  0x2642, 0x2640, 0x00b0, 0x2032, 0x2033, 0x2103, 0xffe5, 0xff04, 0xffe0, 0xffe1, 0xff05, 0xff03,
4020  0xff06, 0xff0a, 0xff20, 0x00a7, 0x2606, 0x2605, 0x25cb, 0x25cf, 0x25ce, 0x25c7, 0x25c6, 0x25a1,
4021  0x25a0, 0x25b3, 0x25b2, 0x25bd, 0x25bc, 0x203b, 0x3012, 0x2192, 0x2190, 0x2191, 0x2193, 0x3013,

First 10 of 738 lines.

6999 lines in 2 placestypescripttests13,997 tokens
tests/diagnostics/deep-nesting-preflight.ts:2–7000 tests/diagnostics/deep-nesting-preflight.ts:3–7001
```
21 +
31 +
41 +
51 +
61 +
71 +
81 +
91 +
101 +
111 +
```
First 10 of 6999 lines.

89 lines in 2 placesc-header3,151 tokens

packages/runtime/src/scr_text_decoder_data.h:2534–2622packages/runtime/src/scr_text_decoder_data.h:6298–6386

25340xe334, 0xe335, 0xe336, 0xe337, 0xe338, 0xe339, 0xe33a, 0xe33b, 0xe33c, 0xe33d, 0xe33e, 0xe33f,
25350xe340, 0xe341, 0xe342, 0xe343, 0xe344, 0xe345, 0xe346, 0xe347, 0xe348, 0xe349, 0xe34a, 0xe34b,
25360xe34c, 0xe34d, 0xe34e, 0xe34f, 0xe350, 0xe351, 0xe352, 0xe353, 0xe354, 0xe355, 0xe356, 0xe357,
25370xe358, 0xe359, 0xe35a, 0xe35b, 0xe35c, 0xe35d, 0xe35e, 0xe35f, 0xe360, 0xe361, 0xe362, 0xe363,
25380xe364, 0xe365, 0xe366, 0xe367, 0xe368, 0xe369, 0xe36a, 0xe36b, 0xe36c, 0xe36d, 0xe36e, 0xe36f,
25390xe370, 0xe371, 0xe372, 0xe373, 0xe374, 0xe375, 0xe376, 0xe377, 0xe378, 0xe379, 0xe37a, 0xe37b,
25400xe37c, 0xe37d, 0xe37e, 0xe37f, 0xe380, 0xe381, 0xe382, 0xe383, 0xe384, 0xe385, 0xe386, 0xe387,
25410xe388, 0xe389, 0xe38a, 0xe38b, 0xe38c, 0xe38d, 0xe38e, 0xe38f, 0xe390, 0xe391, 0xe392, 0xe393,
25420xe394, 0xe395, 0xe396, 0xe397, 0xe398, 0xe399, 0xe39a, 0xe39b, 0xe39c, 0xe39d, 0xe39e, 0xe39f,
25430xe3a0, 0xe3a1, 0xe3a2, 0xe3a3, 0xe3a4, 0xe3a5, 0xe3a6, 0xe3a7, 0xe3a8, 0xe3a9, 0xe3aa, 0xe3ab,

62980xe338, 0xe339, 0xe33a, 0xe33b, 0xe33c, 0xe33d, 0xe33e, 0xe33f, 0xe340, 0xe341, 0xe342, 0xe343,
62990xe344, 0xe345, 0xe346, 0xe347, 0xe348, 0xe349, 0xe34a, 0xe34b, 0xe34c, 0xe34d, 0xe34e, 0xe34f,
63000xe350, 0xe351, 0xe352, 0xe353, 0xe354, 0xe355, 0xe356, 0xe357, 0xe358, 0xe359, 0xe35a, 0xe35b,
63010xe35c, 0xe35d, 0xe35e, 0xe35f, 0xe360, 0xe361, 0xe362, 0xe363, 0xe364, 0xe365, 0xe366, 0xe367,
63020xe368, 0xe369, 0xe36a, 0xe36b, 0xe36c, 0xe36d, 0xe36e, 0xe36f, 0xe370, 0xe371, 0xe372, 0xe373,
63030xe374, 0xe375, 0xe376, 0xe377, 0xe378, 0xe379, 0xe37a, 0xe37b, 0xe37c, 0xe37d, 0xe37e, 0xe37f,
63040xe380, 0xe381, 0xe382, 0xe383, 0xe384, 0xe385, 0xe386, 0xe387, 0xe388, 0xe389, 0xe38a, 0xe38b,
63050xe38c, 0xe38d, 0xe38e, 0xe38f, 0xe390, 0xe391, 0xe392, 0xe393, 0xe394, 0xe395, 0xe396, 0xe397,
63060xe398, 0xe399, 0xe39a, 0xe39b, 0xe39c, 0xe39d, 0xe39e, 0xe39f, 0xe3a0, 0xe3a1, 0xe3a2, 0xe3a3,
63070xe3a4, 0xe3a5, 0xe3a6, 0xe3a7, 0xe3a8, 0xe3a9, 0xe3aa, 0xe3ab, 0xe3ac, 0xe3ad, 0xe3ae, 0xe3af,

First 10 of 89 lines, the second copy on the right.

60 lines in 2 placesc-header2,121 tokens
packages/runtime/src/scr_text_decoder_data.h:3950–4009 packages/runtime/src/scr_text_decoder_data.h:6235–6294
7 lines in 23 placestypescript70 tokens
packages/compiler/src/ir/ir.ts:6510–6516 packages/compiler/src/ir/ir.ts:6539–6545 packages/compiler/src/ir/ir.ts:6566–6574 packages/compiler/src/ir/ir.ts:6630–6636 packages/compiler/src/ir/ir.ts:6653–6659and 18 more

By format, code only

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	179	193,895	837	8,207	4.23%
c	63	85,604	382	4,166	4.87%
javascript	47	4,557	23	233	5.11%
c-header	6	7,143	4	24	0.34%
bash	11	779	0	0	0%
cpp	4	450	0	0	0%
perl	1	174	0	0	0%

By format, all files

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	1,832	319,220	1,623	23,009	7.21%
c	106	92,512	450	4,919	5.32%
javascript	336	16,768	73	1,021	6.09%
c-header	8	14,685	48	1,276	8.69%
txt	149	5,899	12	100	1.7%
yaml	2	916	10	122	13.32%
json	51	16,802	1	10	0.06%
css	1	519	1	10	1.93%
tsx	15	1,806	0	0	0%
markdown	13	1,273	0	0	0%

Trending appearances

Day	Rank	Stars	Files	Lines	Clones	All files	Code	Health	Commit
Sep 28, 2026	#4	5,477 (+102)	2,535	471,932	2,218	6.46%	4.32%	C 57.9	`6aa732c`

Want this for your own project? Install jscpd and run jscpd ., or measure it the way the baselines were measured.