'npm install knex' causes BigInt to be valid in all JS files

[mjbvz]

microsoft/vscode#95187

TypeScript Version: 3.9.0-dev.20200413

Search Terms:

• bigint
• npm install
• javascript

Code
For the JS:

// @ts-check

export const a = 1;

BigInt(1)

1. See error reported about BigInt since we are targeting es6 by default
2. Now run npm install knex

Bug:
The error goes away after the install

Go to definition on BigInt goes to lib.es2020.bigint.d.ts

[RyanCavanaugh]

See #37775

[typescript-bot]

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