feat: add HMR functionality

[diervo]

Details

Add APIs to allow Hot Module Reload
(this is a rebase from Caridy's old PR)

[salesforce-best-lwc-internal]

⚠ Performance Regression

Best has detected that there is a 9.7% performance regression across your benchmarks.

Please click here to see more details.

Click to view significantly changed benchmarks

@lwc/engine-dom

❌ Regressions	base (2342e57)	target (7fdb0d4)	trend
ss-slot-create-container.benchmark/benchmark-slot-ss/synthetic-shadow-create	233.97 (± 1.89ms)	266.80 (± 1.96ms)	+32.8ms (14.0%)
ss-slot-update-component-with-slot.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-component-with-slot	24.27 (± 0.79ms)	26.89 (± 0.94ms)	+2.6ms (10.8%)
ss-slot-update-container-template.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-container-template	23.39 (± 1.18ms)	26.34 (± 0.46ms)	+2.9ms (12.6%)
ss-slot-update-slotted-content.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-slotted-content	180.10 (± 6.08ms)	189.19 (± 7.95ms)	+9.1ms (5.0%)
table-append-1k.benchmark/benchmark-table/append/1k	242.73 (± 1.71ms)	278.87 (± 1.94ms)	+36.1ms (14.9%)
table-clear-1k.benchmark/benchmark-table/clear/1k	13.64 (± 0.16ms)	16.90 (± 0.18ms)	+3.3ms (23.9%)
table-create-10k.benchmark/benchmark-table/create/10k	1276.40 (± 16.50ms)	1463.79 (± 9.45ms)	+187.4ms (14.7%)
table-create-1k.benchmark/benchmark-table/create/1k	146.76 (± 1.58ms)	173.68 (± 1.29ms)	+26.9ms (18.3%)
table-update-10th-1k.benchmark/benchmark-table/update-10th/1k	134.40 (± 1.66ms)	147.99 (± 1.33ms)	+13.6ms (10.1%)
tablecmp-append-1k.benchmark/benchmark-table-component/append/1k	353.80 (± 1.72ms)	386.05 (± 3.34ms)	+32.3ms (9.1%)
tablecmp-clear-1k.benchmark/benchmark-table-component/clear/1k	6.58 (± 0.12ms)	9.89 (± 0.16ms)	+3.3ms (50.4%)
tablecmp-create-10k.benchmark/benchmark-table-component/create/10k	1951.33 (± 10.03ms)	2154.75 (± 12.86ms)	+203.4ms (10.4%)
tablecmp-create-1k.benchmark/benchmark-table-component/create/1k	223.01 (± 1.48ms)	253.59 (± 1.40ms)	+30.6ms (13.7%)
tablecmp-update-10th-1k.benchmark/benchmark-table-component/update-10th/1k	113.23 (± 1.10ms)	131.25 (± 0.69ms)	+18.0ms (15.9%)
wc-append-1k.benchmark/benchmark-table-wc/append/1k	481.15 (± 3.82ms)	511.87 (± 10.76ms)	+30.7ms (6.4%)
wc-clear-1k.benchmark/benchmark-table-wc/clear/1k	21.45 (± 0.22ms)	26.77 (± 0.30ms)	+5.3ms (24.8%)
wc-create-10k.benchmark/benchmark-table-wc/create/10k	2941.10 (± 24.02ms)	3242.93 (± 20.38ms)	+301.8ms (10.3%)
wc-create-1k.benchmark/benchmark-table-wc/create/1k	331.37 (± 0.87ms)	369.39 (± 1.63ms)	+38.0ms (11.5%)
wc-update-10th-1k.benchmark/benchmark-table-wc/update-10th/1k	113.83 (± 0.61ms)	131.29 (± 1.30ms)	+17.5ms (15.3%)

@lwc/engine-server

✅ Improvements	base (2342e57)	target (7fdb0d4)	trend
table-render-10k.benchmark/benchmark-table/render/10k	504.55 (± 18.37ms)	467.23 (± 12.69ms)	-37.3ms (7.4%)
tablecmp-render-10k.benchmark/benchmark-table-component/render/10k	1139.41 (± 24.09ms)	1082.13 (± 29.66ms)	-57.3ms (5.0%)

[salesforce-nucleus]

⚠️ Downstream dependency checks are failing

One or more downstream dependency checks failed against this PR.

Click to expand

Job	Project	Branch	Steps
✅ create-canary-release	salesforce/lwc	master	✅ git clone 3s ✅ load project config <1s ✅ install dependencies 7m 41s ✅ build project 1m 8s ✅ upload repo snapshot 40s ✅ publish canary release 1m 4s
❌ build-dependency step node-install failed: Command yarn install failed	lwc/lwc-platform	master	✅ git clone 10s ✅ load project config <1s ✅ patch npm dependency versions <1s ❌ install dependencies 13m 57s 🔵 build project 🔵 run unit test
❌ build-dependency step node-install failed: Command yarn install failed	salesforce/lightning-components	master	✅ git clone 26s 🌀 load project config ✅ patch npm dependency versions <1s ❌ install dependencies 5s 🔵 build project 🔵 run unit test
✅ build-dependency	nucleus-templates/lwc-components	master	✅ git clone 7s ✅ load project config <1s ✅ patch npm dependency versions <1s ✅ install dependencies 43m 8s ✅ build project <1s ✅ run unit test 5s
❌ build-dependency step node-install failed: Command yarn install failed	BuilderFramework/builder-framework	master	✅ git clone 14s ✅ load project config <1s ✅ patch npm dependency versions <1s ❌ install dependencies 21m 17s 🔵 build project 🔵 run unit test
✅ build-dependency	salesforce/lwr	master	✅ git clone 23s ✅ load project config <1s ✅ patch npm dependency versions <1s ✅ install dependencies 21m 34s ✅ build project 1m 28s ✅ run unit test 2m 12s
❌ build-dependency step node-install failed: Command yarn install failed	communities/webruntime	master	✅ git clone 1m 28s 🌀 load project config ✅ patch npm dependency versions <1s ❌ install dependencies 2s 🔵 build project 🔵 run unit test
❌ build-dependency step node-install failed: Command yarn install failed	BuilderFramework/canonical-ui-metadata-vscode-extension	master	✅ git clone 39s ✅ load project config <1s ✅ patch npm dependency versions <1s ❌ install dependencies 16m 48s 🔵 build project 🔵 run unit test
✅ build-dependency	uiplatform/nucleus	master	✅ git clone 21s ✅ load project config <1s ✅ patch npm dependency versions <1s ✅ install dependencies 23m 3s ✅ build project 2m 45s ✅ run unit test <1s
❌ build-dependency step node-install failed: Command yarn install failed	salesforce/lds	master	✅ git clone 15s ✅ load project config <1s ✅ patch npm dependency versions <1s ❌ install dependencies 17m 54s 🔵 build project 🔵 run unit test
✅ build-dependency	salesforce/lds-lightning-platform	master	✅ git clone 42s ✅ load project config <1s ✅ patch npm dependency versions <1s ✅ install dependencies 37m 21s ✅ build project 5m 35s ✅ run unit test 1m 58s

View full details and logs

[caridy]

LGTM, tests are failing, and perf numbers are not good, not sure if it is really related to this.

[salesforce-best-lwc-internal]

⚠ Performance Regression

Best has detected that there is a 9.7% performance regression across your benchmarks.

Please click here to see more details.

Click to view significantly changed benchmarks

@lwc/engine-dom

❌ Regressions	base (2342e57)	target (cc82c57)	trend
ss-slot-create-container.benchmark/benchmark-slot-ss/synthetic-shadow-create	233.97 (± 1.89ms)	266.88 (± 1.64ms)	+32.9ms (14.1%)
ss-slot-update-component-with-slot.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-component-with-slot	24.27 (± 0.79ms)	27.86 (± 1.49ms)	+3.6ms (14.8%)
ss-slot-update-container-template.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-container-template	23.39 (± 1.18ms)	26.93 (± 0.93ms)	+3.5ms (15.2%)
ss-slot-update-slotted-content.benchmark/benchmark-slot-ss/synthetic-shadow-slot-update-slotted-content	180.10 (± 6.08ms)	192.98 (± 6.74ms)	+12.9ms (7.1%)
table-append-1k.benchmark/benchmark-table/append/1k	242.73 (± 1.71ms)	278.23 (± 1.19ms)	+35.5ms (14.6%)
table-clear-1k.benchmark/benchmark-table/clear/1k	13.64 (± 0.16ms)	16.85 (± 0.19ms)	+3.2ms (23.5%)
table-create-10k.benchmark/benchmark-table/create/10k	1276.40 (± 16.50ms)	1448.86 (± 10.57ms)	+172.5ms (13.5%)
table-create-1k.benchmark/benchmark-table/create/1k	146.76 (± 1.58ms)	174.85 (± 0.82ms)	+28.1ms (19.1%)
table-update-10th-1k.benchmark/benchmark-table/update-10th/1k	134.40 (± 1.66ms)	147.82 (± 2.01ms)	+13.4ms (10.0%)
tablecmp-append-1k.benchmark/benchmark-table-component/append/1k	353.80 (± 1.72ms)	387.77 (± 2.41ms)	+34.0ms (9.6%)
tablecmp-clear-1k.benchmark/benchmark-table-component/clear/1k	6.58 (± 0.12ms)	9.84 (± 0.16ms)	+3.3ms (49.7%)
tablecmp-create-10k.benchmark/benchmark-table-component/create/10k	1951.33 (± 10.03ms)	2133.43 (± 13.02ms)	+182.1ms (9.3%)
tablecmp-create-1k.benchmark/benchmark-table-component/create/1k	223.01 (± 1.48ms)	253.25 (± 1.50ms)	+30.2ms (13.6%)
tablecmp-update-10th-1k.benchmark/benchmark-table-component/update-10th/1k	113.23 (± 1.10ms)	129.64 (± 1.28ms)	+16.4ms (14.5%)
wc-append-1k.benchmark/benchmark-table-wc/append/1k	481.15 (± 3.82ms)	512.18 (± 11.98ms)	+31.0ms (6.4%)
wc-clear-1k.benchmark/benchmark-table-wc/clear/1k	21.45 (± 0.22ms)	26.64 (± 0.34ms)	+5.2ms (24.2%)
wc-create-10k.benchmark/benchmark-table-wc/create/10k	2941.10 (± 24.02ms)	3204.47 (± 34.23ms)	+263.4ms (9.0%)
wc-create-1k.benchmark/benchmark-table-wc/create/1k	331.37 (± 0.87ms)	368.19 (± 1.99ms)	+36.8ms (11.1%)
wc-update-10th-1k.benchmark/benchmark-table-wc/update-10th/1k	113.83 (± 0.61ms)	131.40 (± 1.43ms)	+17.6ms (15.4%)

@lwc/engine-server

✅ Improvements	base (2342e57)	target (cc82c57)	trend
table-render-10k.benchmark/benchmark-table/render/10k	504.55 (± 18.37ms)	473.06 (± 14.72ms)	-31.5ms (6.2%)

[jodarove]

🚢