web_client error: cannot find module 'canvas' #125

The first step of setting up the web_client example, npm install, fails with:

npm ERR! code 1
npm ERR! path ../../../prismarine-viewer
npm ERR! command failed
npm ERR! command sh -c node viewer/prerender.js && webpack
npm ERR! node:internal/modules/cjs/loader:922
npm ERR!   throw err;
npm ERR!   ^
npm ERR! 
npm ERR! Error: Cannot find module 'canvas'
npm ERR! Require stack:
npm ERR! - ../../../prismarine-viewer/viewer/lib/atlas.js
npm ERR! - ../../../prismarine-viewer/viewer/prerender.js
npm ERR!     at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:15)
npm ERR!     at Function.Module._load (node:internal/modules/cjs/loader:763:27)
npm ERR!     at Module.require (node:internal/modules/cjs/loader:991:19)
npm ERR!     at require (node:internal/modules/cjs/helpers:92:18)
npm ERR!     at Object.<anonymous> (../../../prismarine-viewer/viewer/lib/atlas.js:2:27)
npm ERR!     at Module._compile (node:internal/modules/cjs/loader:1102:14)
npm ERR!     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1131:10)
npm ERR!     at Module.load (node:internal/modules/cjs/loader:967:32)
npm ERR!     at Function.Module._load (node:internal/modules/cjs/loader:807:14)
npm ERR!     at Module.require (node:internal/modules/cjs/loader:991:19) {
npm ERR!   code: 'MODULE_NOT_FOUND',
npm ERR!   requireStack: [
npm ERR!     '../../../prismarine-viewer/viewer/lib/atlas.js',
npm ERR!     '../../../prismarine-viewer/viewer/prerender.js'
npm ERR!   ]
npm ERR! }

Subsequent npm installs or npm run build-start (even after e.g. my first guess npm install --save canvas) seem to error with

ERROR in ../../../asap/asap.js 64:11-18
Module not found: Error: Can't resolve 'process/browser' in '../../../asap'
 @ ../../../promise/index.js 6:11-26
 @ ../../../event-promise/index.js 1:14-32
 @ ../../../prismarine-world/src/world.js 4:13-37
 @ ../../../prismarine-world/index.js 1:0-42
 @ ../../viewer/lib/worldView.js 3:28-65
 @ ../../viewer/index.js 3:13-49
 @ ./index.js 7:30-65