ERROR in ./node_modules/array.prototype.flat/implementation.js Module not found: Error: Can't resolve 'es-abstract/2020/ArraySpeciesCreate'

[iandunn]

I got this error when installing Blockbook for the first time and running the start script:

ERROR in ./node_modules/array.prototype.flat/implementation.js Module not found: Error: Can't resolve 'es-abstract/2020/ArraySpeciesCreate'

> blockbook start

Live Reload listening on port 35729

ℹ ｢wds｣: Project is running at http://localhost:8081/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: Content not from webpack is served from /Users/iandunn/vhosts/localhost/wp.test/public_html/content/plugins/inline-time-block/dist
ℹ ｢wds｣: 404s will fallback to /index.html
ℹ ｢wdm｣: wait until bundle finished: /
✖ ｢wdm｣:
ERROR in ./node_modules/array.prototype.flat/implementation.js
Module not found: Error: Can't resolve 'es-abstract/2020/ArraySpeciesCreate' in '/Users/iandunn/vhosts/localhost/wp.test/public_html/content/plugins/inline-time-block/node_modules/array.prototype.flat'
 @ ./node_modules/array.prototype.flat/implementation.js 3:25-71
 @ ./node_modules/array.prototype.flat/index.js
 @ ./node_modules/react-with-styles-interface-css/dist/index.js
 @ ./node_modules/react-with-styles-interface-css/index.js
 @ ./node_modules/react-dates/lib/utils/registerCSSInterfaceWithDefaultTheme.js
 @ ./node_modules/react-dates/lib/initialize.js
 @ ./node_modules/react-dates/initialize.js
 @ ./node_modules/@wordpress/components/build-module/date-time/index.js
 @ ./node_modules/@wordpress/components/build-module/index.js
 @ ./node_modules/@wordpress/block-library/build-module/post-hierarchical-terms/edit.js
 @ ./node_modules/@wordpress/block-library/build-module/post-hierarchical-terms/index.js
 @ ./node_modules/@wordpress/block-library/build-module/index.js
 @ ./node_modules/blockbook-cli/src/app/index.js

Looks like the 2020 folder is missing:

> ll node_modules/es-abstract/20*
2015/ 2016/ 2017/ 2018/ 2019/

> npm ls array.prototype.flat
/Users/iandunn/vhosts/localhost/wp.test/public_html/content/plugins/inline-time-block
└─┬ blockbook-cli@0.7.0
  └─┬ @wordpress/components@10.2.0
    └─┬ react-dates@17.2.0
      └─┬ react-with-styles-interface-css@4.0.3
        └── array.prototype.flat@1.2.4

Re-running npm install doesn't help.

It seems like it might be an issue with webpack resolve paths:

• es-abstract@1.17.0-next.1 release breaking old applications ljharb/es-abstract#84
• https://stackoverflow.com/questions/59325626/webpack-suddenly-fails-to-compile-due-to-module-not-found-error-cant-resolve

As a workaround, I cloned the main branch of es-abstract into node_modules/es-abstract.