AVA tests incompatible with Node 13 #2900

Node 13 supports ES Modules natively, but the esm package monkey patches ES Modules to CommonJS and causes Node to choke when it finds type: module in some dependencies.

This issue may depend on any of these:

• https://github.com/avajs/ava/issues/2293
• https://github.com/TypeStrong/ts-node/issues/935
• https://github.com/standard-things/esm/issues/868