Cursor rule

1---
2description: "Subagent task: Fix strict TypeScript errors in fingerprinting files and add to CORE_FILES"
3globs:
4  - "scripts/check-strict-core.js"
5  - "injected/src/features/fingerprinting-audio.js"
6  - "injected/src/features/fingerprinting-battery.js"
7  - "injected/src/features/fingerprinting-canvas.js"
8  - "injected/src/features/fingerprinting-screen-size.js"
9  - "injected/src/features/fingerprinting-temporary-storage.js"
10---
11 
12# Strict TypeScript: Fingerprinting
13 
14## Task
15 
16Fix all strict-mode TypeScript errors in 5 fingerprinting files and add them to `CORE_FILES`.
17 
18## Branch
19 
20```
21git checkout main && git pull origin main && git checkout -b cursor/strict/fingerprinting
22```
23 
24## Files (26 errors total)
25 
26### `injected/src/features/fingerprinting-audio.js` (10 errors)
27```
28(6,10): error TS7006: Parameter 'args' implicitly has an 'any' type.
29(11,37): error TS7006: Parameter 'channelData' implicitly has an 'any' type.
30(11,50): error TS7006: Parameter 'domainKey' implicitly has an 'any' type.
31(11,61): error TS7006: Parameter 'sessionKey' implicitly has an 'any' type.
32(11,73): error TS7006: Parameter 'thisArg' implicitly has an 'any' type.
33(69,36): error TS7006: Parameter 'thisArg' implicitly has an 'any' type.
34(69,45): error TS7006: Parameter 'args' implicitly has an 'any' type.
35(80,27): error TS7006: Parameter 'thisArg' implicitly has an 'any' type.
36(80,36): error TS7006: Parameter 'args' implicitly has an 'any' type.
37(80,42): error TS7006: Parameter 'audioKey' implicitly has an 'any' type.
38```
39 
40### `injected/src/features/fingerprinting-battery.js` (1 error)
41```
42(12,47): error TS7017: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature.
43```
44 
45### `injected/src/features/fingerprinting-canvas.js` (1 error)
46```
47(6,10): error TS7006: Parameter 'args' implicitly has an 'any' type.
48```
49 
50### `injected/src/features/fingerprinting-screen-size.js` (10 errors)
51```
52(19,33): error TS2339: Property 'availWidth' does not exist on type '{}'.
53(25,33): error TS2339: Property 'availHeight' does not exist on type '{}'.
54(31,33): error TS2339: Property 'colorDepth' does not exist on type '{}'.
55(36,33): error TS2339: Property 'pixelDepth' does not exist on type '{}'.
56(53,30): error TS7006: Parameter 'value' implicitly has an 'any' type.
57(53,37): error TS7006: Parameter 'targetDimension' implicitly has an 'any' type.
58(63,28): error TS7006: Parameter 'property' implicitly has an 'any' type.
59(63,38): error TS7006: Parameter 'value' implicitly has an 'any' type.
60(89,56): error TS2339: Property 'availTop' does not exist on type '{}'.
61(110,56): error TS2339: Property 'availLeft' does not exist on type '{}'.
62```
63 
64### `injected/src/features/fingerprinting-temporary-storage.js` (4 errors)
65```
66(20,75): error TS7006: Parameter 'callback' implicitly has an 'any' type.
67(20,85): error TS7006: Parameter 'err' implicitly has an 'any' type.
68(21,56): error TS7006: Parameter 'usedBytes' implicitly has an 'any' type.
69(21,67): error TS7006: Parameter 'grantedBytes' implicitly has an 'any' type.
70```
71 
72## Fix Patterns
73 
74- **TS7006** (Parameter implicitly any): Most are `args` params for `init()` or wrapper functions. Add `@param` JSDoc. For `args`, look at how `ContentFeature.init(args)` is called — likely `Record<string, unknown>` or a specific config type.
75- **TS7017** (globalThis index): Use `/** @type {Record<string, unknown>} */ (globalThis)` or access through a typed helper.
76- **TS2339** (Property on `{}`): The config object is typed as `{}` but has screen properties. Define a `@typedef` for the screen config shape with `availWidth`, `availHeight`, `colorDepth`, `pixelDepth`, `availTop`, `availLeft`.
77 
78## Workflow
79 
801. `npm ci`
812. Add all 5 files to CORE_FILES in `scripts/check-strict-core.js`
823. Fix each file's errors
834. `npm run tsc-strict-core` — must pass
845. `npm run test-unit` — must pass
856. `npm run lint` — must pass (run `npm run lint-fix` first if needed)
867. Commit: `fix(types): add strict checking for fingerprinting files`
878. `git push -u origin cursor/strict/fingerprinting`
88 
89## Constraints
90 
91- Do NOT use `any` — use `unknown`, specific types, or proper interfaces
92- Do NOT use `@ts-ignore` or `@ts-expect-error`
93- Do NOT modify files outside the assigned list (except `scripts/check-strict-core.js`)
94- Do NOT remove existing CORE_FILES entries
95- Preserve existing behavior — type fixes only, no logic changes
96