@fluentui/theme missing a ./lib/createTheme export

[dzearing]

It turns out some repos are consuming the v8 @fluentui/theme through v7 @uifabric/styling package references via pinning to disregard semver.

This is a problem in itself, but was working until exports maps were introduced. When @uifabric/styling imports createTheme, it gets it from @fluentui/theme/lib/createTheme which now breaks in a webpack 5 environment. v8 packages do not use this theme, so separately we need to remove v7, but to unblock the partial upgrade in 1JS, we need to add this entry.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 06c438e:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[fabricteam]

📊 Bundle size report

_{🤖 This report was generated against 4c3dad268cac06f9b4d38c64b3fa41e95a6ac069}

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 4c3dad268cac06f9b4d38c64b3fa41e95a6ac069 (build)

[fabricteam]

Perf Analysis (@fluentui/react)

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
FluentProviderWithTheme	virtual-rerender-with-unmount	382	396	10	Possible regression
SpinButton	mount	4588	4589	5000	Possible regression

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	960	943	5000
BaseButton	mount	977	976	5000
Breadcrumb	mount	2516	2610	1000
ButtonNext	mount	578	596	5000
Checkbox	mount	1452	1501	5000
CheckboxBase	mount	1183	1283	5000
ChoiceGroup	mount	4311	4248	5000
ComboBox	mount	1034	1034	1000
CommandBar	mount	9229	9174	1000
ContextualMenu	mount	14499	14658	1000
DefaultButton	mount	1177	1135	5000
DetailsRow	mount	3561	3493	5000
DetailsRowFast	mount	3485	3435	5000
DetailsRowNoStyles	mount	3372	3316	5000
Dialog	mount	2085	2104	1000
DocumentCardTitle	mount	315	333	1000
Dropdown	mount	3030	3029	5000
FluentProviderNext	mount	1908	1905	5000
FluentProviderWithTheme	mount	305	284	10
FluentProviderWithTheme	virtual-rerender	285	278	10
FluentProviderWithTheme	virtual-rerender-with-unmount	382	396	10	Possible regression
FocusTrapZone	mount	1658	1754	5000
FocusZone	mount	1775	1670	5000
IconButton	mount	1686	1704	5000
Label	mount	447	493	5000
Layer	mount	2768	2764	5000
Link	mount	581	599	5000
MakeStyles	mount	1600	1613	50000
MenuButton	mount	1495	1506	5000
MessageBar	mount	2020	2009	5000
Nav	mount	3021	3062	1000
OverflowSet	mount	1149	1154	5000
Panel	mount	1993	2049	1000
Persona	mount	947	910	1000
Pivot	mount	1452	1444	1000
PrimaryButton	mount	1344	1328	5000
Rating	mount	6772	6795	5000
SearchBox	mount	1287	1312	5000
Shimmer	mount	2371	2367	5000
Slider	mount	1866	1867	5000
SpinButton	mount	4588	4589	5000	Possible regression
Spinner	mount	565	560	5000
SplitButton	mount	2968	2915	5000
Stack	mount	615	638	5000
StackWithIntrinsicChildren	mount	2184	2208	5000
StackWithTextChildren	mount	4607	4719	5000
SwatchColorPicker	mount	10220	10165	5000
TagPicker	mount	2517	2468	5000
TeachingBubble	mount	89922	52583	5000
Text	mount	537	579	5000
TextField	mount	1442	1300	5000
ThemeProvider	mount	1195	1156	5000
ThemeProvider	virtual-rerender	767	774	5000
ThemeProvider	virtual-rerender-with-unmount	1794	1709	5000
Toggle	mount	898	883	5000
buttonNative	mount	288	304	5000

[ecraig12345]

I wish there was a way to add comments in package.json...without that, there's a bigger risk of these references to nonexistent files being deleted later :(