fix(common): remove allowJs from web's tsconfig.base.json

[mcdurdin]

Fixes: #11716

@keymanapp-test-bot skip

[keymanapp-test-bot]

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[mcdurdin]

Fails web test:

12:07:31   [web/src/tools/building/sourcemap-root] dependency build, started by web/src/app/browser
12:07:31   [web/src/tools/building/sourcemap-root] build.sh parameters: <configure build --deps --builder-dep-parent web/src/app/browser>
12:07:31   [web/src/tools/building/sourcemap-root] skipping configure, up-to-date
12:07:31   [web/src/tools/building/sourcemap-root] skipping build, up-to-date
12:07:31   (node:694905) ExperimentalWarning: Custom ESM Loaders is an experimental feature and might change at any time
12:07:31   (Use `node --trace-warnings ...` to show where the warning was created)
12:07:31   (node:694905) ExperimentalWarning: The Node.js specifier resolution flag is experimental. It could change or be removed at any time.
12:07:41   
12:07:41   TSError: ⨯ Unable to compile TypeScript:
12:07:41   ../../../../../common/web/input-processor/build/obj/index.js(1,22): error TS6053: File '/var/lib/TeamCity/work/99b311828f4ee7c/keyman/common/web/predictive-text/src/worker-interface.d.ts' not found.
12:07:41   
12:07:41       at createTSError (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/index.ts:859:12)
12:07:41       at reportTSError (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/index.ts:863:19)
12:07:41       at getOutput (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/index.ts:1077:36)
12:07:41       at Object.compile (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/index.ts:1433:41)
12:07:41       at transformSource (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/esm.ts:400:37)
12:07:41       at /var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/esm.ts:278:53
12:07:41       at async addShortCircuitFlag (/var/lib/TeamCity/work/99b311828f4ee7c/keyman/node_modules/ts-node/src/esm.ts:409:15)
12:07:41       at async nextLoad (node:internal/modules/esm/loader:163:22)
12:07:41       at async ESMLoader.load (node:internal/modules/esm/loader:603:20)
12:07:41       at async ESMLoader.moduleProvider (node:internal/modules/esm/loader:457:11)

https://build.palaso.org/buildConfiguration/Keymanweb_TestPullRequests/469868?buildTab=log&linesState=711&logView=flowAware&focusLine=1960

[jahorton]

The current error is being triggered during ./web/build.sh test:app/browser and will also be triggered with ./web/build.sh test:engine/osk. It appears that running under ts-node mode is failing to find a type-definition file, somehow, because of the changes involved - though it's not clear why.

Sadly, I don't get well-detailed error reports like this on my dev machines - both return a generic "ERROR: null" for me.

The cleanest way forward may be to precompile the TS tests used by Web... and I think I've about got something worked out for that now. See #11723 below, which I've based on this PR.

[keyman-server]

Changes in this pull request will be available for download in Keyman version 18.0.51-alpha