The Problem with Language Migration
You have a JavaScript function. It works. Your team has decided to move to Rust. What are your options today?
Option A: Rewrite it by hand. Spend a week. Hope you got the edge cases right. Write all new tests. Debug for another week. Pray.
Option B: Ask an AI to translate it. Get something that looks right. Ship it. Discover a subtle integer overflow bug in production three months later. Explain to your CTO what happened.
Option C: Three commands. Verified. With tests. Done.
BRIK64 CLI lift utils.js # 1. Convert to verified blueprint BRIK64 CLI check utils.pcd # 2. Verify the blueprint BRIK64 CLI build utils.pcd \ --target rust # 3. Export to Rust + testsLet me show you exactly how this works.
Step 1: Lift
You have this JavaScript:
// utils.js
function fibonacci(n) { if (n <= 1)
return n;
let a = 0, b = 1; for (let i = 2; i <= n; i++) {
let temp = a + b; a = b; b = temp; }
return b; }
function clamp(value, min, max) { if (value < min)
return min; if (value > max)
return max;
return value; }
function gcd(a, b) { while (b !== 0) {
let temp = b; b = a % b; a = temp; }
return a; }Run the Lifter:
$ BRIK64 CLI lift utils.js ⚡ Lifting utils.js (JavaScript)... Summary: 3/3 functions liftable Overall score: 100% ✓ LIFTABLE fibonacci — 100% ✓ LIFTABLE clamp — 100% ✓ LIFTABLE gcd — 100% 3 circuits liftedThree for three. All pure functions — no side effects, completely deterministic. The Lifter converts them to PCD blueprints automatically. Zero manual work. Zero configuration.
Step 2: Check
Now here is the part that changes everything. Verify that the blueprints are mathematically correct:
$ BRIK64 CLI check fibonacci.pcd ✓ fibonacci: verified (0.001s) $ BRIK64 CLI check clamp.pcd ✓ clamp: verified (0.001s) $ BRIK64 CLI check gcd.pcd ✓ gcd: verified (0.001s)Each blueprint is now review-scoped. The logic is reviewed within the declared input domain — not "tested against some cases," not "probably right." Proven. For all cases. Every input. Every edge case. Every combination. Done.
Step 3: Build
Now, the moment you have been waiting for. Export to Rust:
$ BRIK64 CLI build fibonacci.pcd --target rust ✓ Generated: fibonacci.rs ✓ Generated: fibonacci_test.rs (6 test cases) $ BRIK64 CLI build clamp.pcd --target rust ✓ Generated: clamp.rs ✓ Generated: clamp_test.rs (8 test cases) $ BRIK64 CLI build gcd.pcd --target rust ✓ Generated: gcd.rs ✓ Generated: gcd_test.rs (5 test cases)You now have idiomatic, production-ready Rust — with auto-generated tests included. This is not a line-by-line translation. The code is generated from the verified blueprint, following Rust conventions, with Rust idioms, with Rust safety. And every single test is derived from the mathematical certification.
But wait — what about the other direction?
But here is what makes this truly revolutionary. That same blueprint — the same verified truth — can export to supported targets:
Why this is better than AI translation
When an AI translates JavaScript to Rust, it is guessing. Sophisticated guessing, sure — pattern matching at scale. "This JS pattern usually maps to this Rust pattern." And it works most of the time. But "most of the time" is exactly the problem when you are shipping financial software, medical devices, or anything where correctness actually matters.
When BRIK64 exports from a PCD blueprint:
1. The logic is verified — supported by bounded evidence checked within the declared input domain. 2. The target code is generated from that verified specification — not translated, generated. 3. The tests are derived from the certification, not guessed by a developer. 4. Every export produces identical behavior — JavaScript, Rust, Python, Go, C — all implement the exact same verified blueprint. Bit for bit.
This is not translation. This is generation from a proven specification. And that difference? That is the difference between "it probably works" and "it is bounded by the declared model to work."
The complete migration workflow
1. BRIK64 CLI lift legacy-app/src/ --format json → See which functions are migratable (usually 60-80%) 2. Review the liftability report → Pure functions: ready to migrate → Impure functions: need architectural decisions 3. BRIK64 CLI build *.pcd --target rust → Generate Rust code + tests for all liftable functions 4. Push to new GitHub repo → review-scoped, tested, ready for production
