• There are 468 files with 78,270 lines of code.
• 12 very long files (18,863 lines of code)
• 26 long files (16,534 lines of code)
• 83 medium size files (26,426 lines of code)
• 57 small files (8,148 lines of code)
• 290 very small files (8,299 lines of code)

File	# lines	≈ tokens to read	# changes (1y)	≈ lines edited per change	lines read per line changed
oxlint.config.ts in root	1410	~7k–20k	188	~10	~150
client.ts in src	2409	~15k–50k	56	~70	~30
ChatCompletionStream.ts in src/lib	2134	~10k–30k	39	~50	~30
realtime.ts in src/resources/realtime	1492	~10k–30k	31	~200	~7
EventStream.ts in src/lib	1759	~10k–30k	26	~100	~20
completions.ts in src/resources/chat/completions	1046	~7k–15k	39	~70	~15
AssistantStream.ts in src/lib	855	~5k–15k	35	~50	~20
streaming.ts in src/core	590	~3k–10k	45	~50	~15
usage.ts in src/resources/admin/organization	1925	~10k–30k	13	~700	~3
agents.ts in src/resources/beta/agents	1787	~10k–30k	14	~500	~5
transform.ts in src/lib	1590	~10k–30k	15	~150	~10
webhooks.ts in src/resources/webhooks	896	~5k–15k	22	~100	~7
runs.ts in src/resources/evals/runs	1018	~7k–15k	19	~300	~3
test-packed-package.ts in scripts	692	~3k–10k	26	~30	~20
audit-logs.ts in src/resources/admin/organization	1026	~7k–15k	14	~150	~7
AbstractChatCompletionRunner.ts in src/lib	515	~3k–10k	25	~50	~10
videos.ts in src/resources	519	~3k–10k	24	~70	~7
beta.ts in src/resources/beta	775	~5k–15k	16	~30	~30
uploads.ts in src/internal	524	~3k–10k	23	~50	~10
utils.ts in src/internal/qs	559	~3k–10k	21	~30	~15

Tokens are lines × 7 to 14 (analysis.fileReadsForChanges). Lines edited per change are the file's lines added and deleted divided by its commits over the whole history. Agents read about 2,000 lines at a time: when a 17,000-line file was split into modules, the tokens an agent read for the same change fell by 83% (The Economic Benefit of Refactoring, 2026).

There are 46 files with lines longer than 120 characters. In total, there are 139 long lines.

File	# lines	# units	# long lines
test-packed-package.ts in scripts	692	1	27
aws.ts in src/providers/bedrock	260	12	10
uploads.ts in src/internal	524	18	10
ChatCompletionStream.ts in src/lib	2134	51	9
client.ts in src	2409	3	6
custom_code_report.py in scripts/castiron	949	25	4
string.ts in src/_vendor/zod-to-json-schema/parsers	356	3	4
agents.ts in src/resources/beta/agents	1787	7	4
bedrock.ts in src/internal	435	20	4
types.ts in src/internal	49	-	4
AssistantStream.ts in src/lib	855	24	4
standard-schema.ts in src/helpers	531	32	4
internal-base.ts in src/realtime	200	8	3
azure.ts in src	165	5	3
transform.ts in src/lib	1590	47	3
custom_code_budget.py in scripts/castiron	376	11	2
websocket.ts in src/beta/realtime	265	7	2
internal-base.ts in src/beta/realtime	123	7	2
bedrock.ts in src	201	13	2
object.ts in src/_vendor/zod-to-json-schema/parsers	75	3	2
shims.ts in src/internal	74	9	2
websocket.ts in src/realtime	257	6	2
EventStream.ts in src/lib	1759	49	2
zod.ts in src/helpers	328	22	2
transformer.ts in scripts/_vendor/tsc-multi/src	306	8	1
fix-index-exports.cjs in scripts/utils	18	-	1
mjs x509-transport-state.mjs in scripts/utils	18	-	1
postprocess-files.cjs in scripts/utils	137	4	1
custom_code_test_support.py in scripts/castiron	60	6	1
feature_request.yml in .github/ISSUE_TEMPLATE	20	-	1
bug_report.yml in .github/ISSUE_TEMPLATE	64	-	1
config.yml in .github/ISSUE_TEMPLATE	7	-	1
streaming.ts in src/core	590	24	1
bedrock.ts in src/providers	32	3	1
internal-base.ts in src/resources/beta/responses	99	4	1
internal-base.ts in src/resources/responses	95	4	1
internal-base.ts in src/resources/live/sideband	90	4	1
internal-base.ts in src/resources/live/forks	90	4	1
internal-base.ts in src/resources/live	87	4	1
webhooks.ts in src/resources/webhooks	896	4	1
x509-token-exchange.ts in src/internal/auth	285	9	1
responses-ws-credentials.ts in src/internal	139	4	1
AbstractChatCompletionRunner.ts in src/lib	515	14	1
ResponsesParser.ts in src/lib	275	11	1
parser.ts in src/lib	333	16	1
zod-v3-strict-schema.ts in src/helpers	474	17	1

• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.