fix: disable loose transformations and shipped proposals in babel

[ivan-aksamentov]

Related issues and PRs

Related to the issue resolved in https://github.com/neherlab/covid19_scenarios/pull/729.

729 solves the problem for this particular piece of code, while this PR aims to resolve the root cause globally.

Description

This disables loose transformations in babel, to avoid inconsistencies between different environments.

In particular, this code is transpiled differently in dev and prod when loose is enabled:

[...Array(numberStochasticRuns).keys()]

Additionally, this disables "shipped proposals", just in case, as it is a risky option too.

See also:

• https://babeljs.io/docs/en/babel-plugin-transform-spread#loose
• https://github.com/babel/babel-preset-env/issues/76
• https://babeljs.io/docs/en/babel-preset-env#loose

Impacted Areas in the application

Build, transpilation.

Testing

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