Investigate failed npm install of ed-forge branch

[SamClayton]

$ npm install
npm ERR! code 2
npm ERR! git dep preparation failed
npm ERR! command /usr/local/Cellar/node/15.12.0/bin/node /usr/local/lib/node_modules/npm/bin/npm-cli.js install --force --cache=/Users/samworks/.npm --prefer-offline=false --prefer-online=false --offline=false --no-progress --no-save --no-audit
npm ERR! > ed-forge@1.4.0 prepublish
npm ERR! > npm run build
npm ERR!
npm ERR!
npm ERR! > ed-forge@1.4.0 build
npm ERR! > npm run build_light && node coriolis_mapper.js
npm ERR!
npm ERR!
npm ERR! > ed-forge@1.4.0 build_light
npm ERR! > tsc
npm ERR!
npm ERR! src/data/blueprints.ts(14,29): error TS2307: Cannot find module './blueprints.json' or its corresponding type declarations.
npm ERR! src/data/blueprints.ts(15,32): error TS2307: Cannot find module './experimentals.json' or its corresponding type declarations.
npm ERR! src/data/index.ts(15,31): error TS2307: Cannot find module './module_cache.json' or its corresponding type declarations.
npm ERR! src/data/items.ts(15,26): error TS2307: Cannot find module './modules.json' or its corresponding type declarations.
npm ERR! src/data/ships.ts(11,24): error TS2307: Cannot find module './ships.json' or its corresponding type declarations.
npm ERR! npm WARN using --force Recommended protections disabled.
npm ERR! npm WARN deprecated request-promise-native@1.0.9: request-promise-native has been deprecated because it extends the now deprecated request package, see request/request#3142
npm ERR! npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm ERR! npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm ERR! npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm ERR! npm WARN deprecated left-pad@1.3.0: use String.prototype.padStart()
npm ERR! npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm ERR! npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm ERR! npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm ERR! npm WARN deprecated @types/handlebars@4.1.0: This is a stub types definition. handlebars provides its own type definitions, so you do not need this installed.
npm ERR! npm WARN deprecated request@2.88.2: request has been deprecated, see request/request#3142
npm ERR! npm WARN deprecated highlight.js@9.18.5: Support has ended for 9.x series. Upgrade to @latest
npm ERR! npm WARN using --force Recommended protections disabled.
npm ERR! npm WARN using --force Recommended protections disabled.