perf: use const instead of enums to min bundle size

[davidlj95]

Typescript enums are transformed into JS functions when compiling. Those create an object that can't be tree-shaken given it may be accessed dynamically. So using consts to ensure only the used enum props end up in the bundle

Indeed, Typescript enums may not be tree shaken even as a whole: microsoft/TypeScript#27604

Saving bytes as part of #112

[davidlj95]

Current dependencies on/for this PR:

• main
  • PR perf: use const instead of enums to min bundle size #192 👈

This stack of pull requests is managed by Graphite.

[github-actions]

📦 Bundle size (Angular v15)

Git ref: 0da72c7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3430 bytes (3.4KiB)	3430 bytes (3.4KiB)	No change
ngx-meta-json-ld.mjs	402 bytes (402B)	402 bytes (402B)	No change
ngx-meta-open-graph-profile.mjs	428 bytes (428B)	501 bytes (501B)	-14.57%: -73 bytes (-73B)
ngx-meta-open-graph.mjs	833 bytes (833B)	1182 bytes (1.2KiB)	-29.52%: -349 bytes (-349B)
ngx-meta-routing.mjs	897 bytes (897B)	897 bytes (897B)	No change
ngx-meta-standard.mjs	940 bytes (940B)	940 bytes (940B)	No change
ngx-meta-twitter-card.mjs	675 bytes (675B)	789 bytes (789B)	-14.44%: -114 bytes (-114B)
Total	7605 bytes (7.5KiB)	8141 bytes (8.0KiB)	-6.58%: -536 bytes (-536B)

[github-actions]

📦 Bundle size (Angular v16)

Git ref: 0da72c7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3420 bytes (3.4KiB)	3420 bytes (3.4KiB)	No change
ngx-meta-json-ld.mjs	402 bytes (402B)	402 bytes (402B)	No change
ngx-meta-open-graph-profile.mjs	428 bytes (428B)	492 bytes (492B)	-13.00%: -64 bytes (-64B)
ngx-meta-open-graph.mjs	833 bytes (833B)	1173 bytes (1.2KiB)	-28.98%: -340 bytes (-340B)
ngx-meta-routing.mjs	897 bytes (897B)	897 bytes (897B)	No change
ngx-meta-standard.mjs	940 bytes (940B)	940 bytes (940B)	No change
ngx-meta-twitter-card.mjs	675 bytes (675B)	780 bytes (780B)	-13.46%: -105 bytes (-105B)
Total	7595 bytes (7.5KiB)	8104 bytes (8.0KiB)	-6.28%: -509 bytes (-509B)

[github-actions]

📦 Bundle size (Angular v17)

Git ref: 0da72c7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3163 bytes (3.1KiB)	3163 bytes (3.1KiB)	No change
ngx-meta-json-ld.mjs	236 bytes (236B)	236 bytes (236B)	No change
ngx-meta-open-graph-profile.mjs	302 bytes (302B)	355 bytes (355B)	-14.92%: -53 bytes (-53B)
ngx-meta-open-graph.mjs	670 bytes (670B)	1009 bytes (1009B)	-33.59%: -339 bytes (-339B)
ngx-meta-routing.mjs	725 bytes (725B)	725 bytes (725B)	No change
ngx-meta-standard.mjs	829 bytes (829B)	829 bytes (829B)	No change
ngx-meta-twitter-card.mjs	515 bytes (515B)	615 bytes (615B)	-16.26%: -100 bytes (-100B)
Total	6440 bytes (6.3KiB)	6932 bytes (6.8KiB)	-7.09%: -492 bytes (-492B)

[github-actions]

🎉 This PR is included in version 1.0.0-alpha.30 🎉

The release is available on:

• npm package (@main dist-tag)
• GitHub release

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