Element
Output
Deterministic build artifacts with checksum verification.
Output
Output is the artifact store for Code Editor Land. Every bundle produced by the build pipeline lands here, and every bundle is deterministic: the same commit always produces the same bytes.
The Problem
VS Code builds differ between machines. Timestamps, randomized identifiers, non-deterministic module ordering, and platform-specific path separators all contribute to outputs that vary even when the source is identical. This makes it impossible to verify that a released binary matches the audited source.
When two developers build the same commit and get different checksums, trust in the supply chain breaks down. You cannot distinguish a legitimate build variation from a compromised artifact.
How Output Eliminates It
Output enforces determinism at every stage. The build pipeline (driven by Rest and Maintain) strips timestamps, fixes module ordering, normalizes path separators, and seeds any randomized identifiers with values derived from the commit hash.
After each build, Output computes BLAKE3 checksums for every artifact and records them in a manifest. CI verifies that the manifest matches a reproducible build. If any byte differs, the pipeline fails.
What You Experience
You can verify any release. Download the source, run the build, compare checksums. If they match, the binary is exactly what the source says it is. No trust required beyond the code you can read.
For day-to-day development, deterministic output means that build caches work reliably. If the checksum has not changed, the artifact has not changed, and downstream steps can be skipped entirely.
Key Technologies
BLAKE3 Checksums, Deterministic Bundling, esbuild, Reproducible Builds, Supply-Chain Verification.