revert.wtf Parser And Decoder Skill

Use this skill when working in packages/parser, packages/selectors, packages/aa, or shared result types in packages/core.

Boundaries

• Parser behavior must stay reproducible from package data and caller-provided input.
• Keep live lookups out of parser paths.
• No website-only explanation logic in packages/parser.
• Website, CLI, MCP, and packages should consume the same parser/catalog results.
• Preserve evidence-based ranking. Specific decoded evidence should beat broad wrappers.
• Keep full catalog-backed surfaces on server/API boundaries. Do not make a browser client download the catalog for one decode/search.
• Use package subpaths for small imports: @revertwtf/parser/decode, @revertwtf/parser/explain, @revertwtf/catalog/panic, @revertwtf/aa/parse, @revertwtf/aa/explain.

Parser Map

• packages/parser/src/normalizeError.ts collects messages, codes, error names, revert data, method/action hints, and trace frames.
• packages/parser/src/extractRevertData.ts finds revert bytes in nested provider and simulator payloads.
• packages/parser/src/extractTraceFailures.ts summarizes failed call frames.
• packages/parser/src/decodeRevertData.ts decodes Solidity Error(string), Panic(uint256), provided ABI errors, and selector catalog matches.
• packages/parser/src/matchCatalog.ts indexes and matches catalog patterns.
• packages/parser/src/explain.ts ranks decoded results, trace evidence, and catalog matches into user-facing explanations.
• packages/parser/src/browser.ts, packages/catalog/src/browser.ts, and packages/aa/src/browser.ts protect browser-condition imports from accidental full-data bundles.
• packages/aa/src/ handles ERC-4337 AAxx and EntryPoint FailedOp/FailedOpWithRevert.

Workflow

1. Reproduce with a fixture or minimal object.
2. Decide whether the issue belongs in:
• normalization/extraction,
• revert decoding,
• catalog matching,
• AA decoding,
• selector data,
• or catalog entry data.
3. Keep the behavioral change narrow and covered by tests.
4. Add fixtures for new provider shapes or revert payloads.
5. Avoid changing match priority globally unless a test proves the previous order was wrong.

Tests And Checks

node node_modules/typescript/bin/tsc -p packages/core/tsconfig.json --noEmit
node node_modules/typescript/bin/tsc -p packages/selectors/tsconfig.json --noEmit
node node_modules/typescript/bin/tsc -p packages/parser/tsconfig.json --noEmit
node node_modules/typescript/bin/tsc -p packages/aa/tsconfig.json --noEmit

When the local runner allows it:

pnpm --filter @revertwtf/parser test
pnpm --filter @revertwtf/aa test
pnpm --filter @revertwtf/selectors test

If pnpm/Vitest fails with spawn EPERM, report that and include direct tsc plus a targeted Node smoke check.