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• Would you like to work on this feature?

What problem are you trying to solve?

The current BigIntLiteral stores a string representation of bigint. This is inconsistent with how other primitive literals are stored. For example, NumericLiteral stores the number as value.

Describe the solution you'd like

Add bigint: string property to BigIntLiteral to store the string representation. Change value: string to value: bigint. If a plugin depends on BigIntLiteral#value, they should switch to BigIntLiteral#bigint in Babel 8.

To smooth the transition, accept both string and bigint in the Babel 7 t.bigIntLiteral AST builder. In Babel the builder should only accept positive bigint.

Describe alternatives you've considered

N.A.

Documentation, Adoption, Migration Strategy

This feature is first suggested by @nicolo-ribaudo in #15801 (comment).