Add esnext lib reference for BigInt (#37)

SamVerschueren · sindresorhus · commit 426ccd34e560 · 2019-05-15T18:34:37.000+07:00
diff --git a/source/basic.d.ts b/source/basic.d.ts
@@ -1,3 +1,5 @@
+/// <reference lib="esnext"/>
+
 // TODO: This can just be `export type Primitive = not object` when the `not` keyword is out.
 /**
 Matches any [primitive value](https://developer.mozilla.org/en-US/docs/Glossary/Primitive).

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+/// <reference lib="esnext"/>`
	`2`	`+`
`1`	`3`	// TODO: This can just be `export type Primitive = not object` when the `not` keyword is out.
`2`	`4`	`/**`
`3`	`5`	`Matches any [primitive value](https://developer.mozilla.org/en-US/docs/Glossary/Primitive).`