[DO-NOT-MERGE] Add Nunjucks

[lourot]

@magne4000 I'm stuck on this one. As part of a future bigger PR in which I add the Vue boilerplate, I'm trying to make use of nunjucks. This fails with

+ node packages/cli/dist/index.js --vue ../bati-output

 ERROR  Dynamic require of "events" is not supported

  at packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:13:9
  at ../../../node_modules/.pnpm/nunjucks@3.2.4/node_modules/nunjucks/src/object.js (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:994:24)
  at __require2 (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:16:50)
  at ../../../node_modules/.pnpm/nunjucks@3.2.4/node_modules/nunjucks/src/nodes.js (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:1135:21)
  at __require2 (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:16:50)
  at ../../../node_modules/.pnpm/nunjucks@3.2.4/node_modules/nunjucks/src/parser.js (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:1487:18)
  at __require2 (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:16:50)
  at ../../../node_modules/.pnpm/nunjucks@3.2.4/node_modules/nunjucks/src/compiler.js (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:2904:19)
  at __require2 (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:16:50)
  at ../../../node_modules/.pnpm/nunjucks@3.2.4/node_modules/nunjucks/src/environment.js (packages/cli/dist/boilerplates/@batijs/shared/files/$index.html.js:10005:20)



 ERROR  Dynamic require of "events" is not supported

I understand that nunjucks is CommonJS and it probably does a require("events"), but I can't find how to solve this. I have tried to fiddle a bit more with core/rollup.config.js and tsup/index.ts, by adding nunjucks to these lists, but I just ended up hitting other problems and the search space is too big for me. Do you know more precisely how to fix this? Should events be added to a list somewhere?

Or is this the reason why you have created a magicast.ts that re-exports everything from magicast? Should I do the same for nunjucks? Thanks!

[magne4000]

Urgh, that's a shame.
I somewhat could fix that like I did for putout I think, but adding nunjucks to the core build adds 2.7MB to the bundle size, that a total no go.

FYI, external in packages/core/rollup.config.js are for putout because esbuild can't properly treeshake the code, and is not aware that we do not use those dependencies.
The goal of the core lib is to bundle all dependencies in a unique file, but for that we need proper libs that can be correctly bundled.

Alternatives

• Handlebars will probably have the same bundle size issue
• micromustache has an ESModule build and native TS support, but doesn't seem to support conditionnals
• EJS seems lighter, someone even rebundled it as ESM
• SquirrellyJS also has ESModule build and native TS support, and seems to have all the features we need. This one seems the most promising

[lourot]

Thanks a lot @magne4000 🙏 All clear. I'll try out SquirellyJS