fix(@aws-amplify/core): bump tslib to ^2.1.0 to guarantee __spreadArray at runtime

[dikshit-n]

Summary

Bump @aws-amplify/core v5 runtime tslib dependency from ^1.8.0 to ^2.1.0 so the emitted __spreadArray helper is guaranteed to exist at runtime.

Problem

@aws-amplify/core@5.8.18 compiles with importHelpers: true + target: es5, emitting calls to tslib.__spreadArray. However, ^1.8.0 resolves only to tslib@1.x (max 1.14.1), which does not export __spreadArray — it was added in tslib@2.1.0. Under certain dependency-tree conditions (e.g. a peer pulling tslib@1.x), this causes __spreadArray is not a function at runtime.

This is the same class of bug fixed for @aws-amplify/datastore in #14878.

Solution

Bump dependencies.tslib from ^1.8.0 to ^2.1.0 in packages/core/package.json. This mirrors the datastore fix and guarantees the __spreadArray helper is available when core's lib is consumed.

Changes Made

• packages/core/package.json: tslib dependency range ^1.8.0 → ^2.1.0

Testing

• No code changes — dependency version bump only.
• npm ls tslib in @aws-amplify/core workspace confirms ^2.1.0 resolves correctly.

Checklist

• Dependency range is a non-breaking bump
• Matches the pattern applied to @aws-amplify/datastore in fix(datastore): declare tslib ^2.1.0 to fix __spreadArray is not a function #14878
• No code changes — trivially safe fix
• Targets v5-stable maintenance branch

Closes #14879

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[bobbor]

Thanks @dikshit-n for the PR. Looks good. let's move forward