EDITED FOR PEOPLE JUST GETTING HERE:

node-gyp v7 should solve these issues.

Please follow the steps in macOS_Catalina.md

sha3@1.2.3 install /Users/drjosephdavids/node_modules/keccakjs/node_modules/sha3 node-gyp rebuild

No receipt for 'com.apple.pkg.CLTools_Executables' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLILeo' found at '/'.

No receipt for 'com.apple.pkg.DeveloperToolsCLI' found at '/'.

gyp: No Xcode or CLT version detected! I'M RUNNING XCODE 11.2beta gyp ERR! configure error gyp ERR! stack Error: gyp failed with exit code: 1 gyp ERR! stack at ChildProcess.onCpExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:351:16) gyp ERR! stack at ChildProcess.emit (events.js:198:13) gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12) gyp ERR! System Darwin 19.0.0 gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /Users/drjosephdavids/node_modules/keccakjs/node_modules/sha3 gyp ERR! node -v v10.16.3 gyp ERR! node-gyp -v v5.0.5 gyp ERR! not ok npm WARN enoent ENOENT: no such file or directory, open '/Users/drjosephdavids/package.json' npm WARN drjosephdavids No description npm WARN drjosephdavids No repository field. npm WARN drjosephdavids No README data npm WARN drjosephdavids No license field.

npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! sha3@1.2.3 install: node-gyp rebuild npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the sha3@1.2.3 install script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in: npm ERR! /Users/drjosephdavids/.npm/_logs/2019-10-16T17_41_20_021Z-debug.log

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<details><summary>Verbose output (from npm or node-gyp):</summary>

Paste your log here, between the backticks. It can be:
  - npm --verbose output,
  - or contents of npm-debug.log,
  - or output of node-gyp rebuild --verbose.

</details>

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I edited the original post with the fix that @gibfahn added to #569.