@stopcock/fp-codemod

TypeScript-aware, conservative migrations from Stopcock FP 1 to FP 2.

bun add -d typescript @stopcock/fp-codemod
bunx stopcock-fp-codemod --check src
bunx stopcock-fp-codemod --write src

The codemod safely:

• rewrites stream, dict, and dual-lite package subpaths;
• splits legacy root namespaces such as A, O, and Stream into focused subpath imports;
• moves legacy named Option, Result, Guard, and Function exports to their modules;
• renames explainPipeline, moves compiler telemetry to the compile subpath, and converts positional Option/Result match handlers to named records;
• preserves aliases, type-only imports, quote style, and semicolon style;
• emits explicit errors for runtime-JIT, async Result, Logic, and old optics migrations that require a design decision rather than guessing.

Dry-run is the default. --check is suitable for CI, --write applies the reported mechanical edits, and --json emits a machine-readable summary. Warnings and errors identify the semantic follow-up that cannot be automated.

Programmatic use:

import { transformSource } from '@stopcock/fp-codemod'
import { runCodemod } from '@stopcock/fp-codemod/node'

const result = transformSource(sourceText, 'example.ts')
const summary = await runCodemod(['src'], { write: true })

TypeScript 7 is a peer dependency so the codemod uses the same compiler API as the project it migrates.