Convert to npm

[peachbits]

Note

Low Risk
Tooling and documentation only; no runtime or library code changes in this diff.

Overview
Switches the repo from Yarn to npm as the documented and CI package manager.

Travis now runs npm run verify instead of yarn verify. .yarnrc is deleted and .npmrc adds legacy-peer-deps=true for installs. .gitignore no longer ignores package-lock.json, so the npm lockfile can be committed. README and docs/currency-integration.md tell contributors to use npm run start instead of yarn start for the Webpack dev server.

^{Reviewed by Cursor Bugbot for commit f789ab8. Bugbot is set up for automated code reviews on this repo. Configure here.}

[j0ntz]

CI status: Travis is red, failing at the test step of verify (prepare/lint/types pass; Bugbot is clean). Verified from the build log:

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" — test/common/fees/calcMinerFeePerByte.spec.ts

Same root cause as EdgeApp/disklet#45 — after the npm conversion mocha isn't loading the TypeScript register, so .ts specs can't be imported. The mocha .ts loader needs wiring up.

[j0ntz]

Applied in 332e586. Pinned get-func-name to 2.0.2 via npm overrides. The lock had resolved the broken ESM-only get-func-name@2.0.1, which chai (CommonJS) can't require → mocha falls back to import() of the .ts specs → ERR_UNKNOWN_FILE_EXTENSION. Verified on Node 18 (matching this PR's CI): npm ci in sync + npm run verify green (1215 passing). Flagging since this is my change on your branch — please review.

[cursor]

Stale comment

[j0ntz]

Approving — review threads are settled (the remaining open thread, where present, has a pending note to answer or address before merging) and real CI is green; block-wip-pr clears once the fixups are squashed.