"No interface" better error message

It's not obvious how to fix it when you read the error message. It's way more obvious when you read the code.

This patch gives more clues to the user to fix it. Solves #1312 (closed)

changed milestone to %1.7

added 116 commits

• a0253afe...dd0083cf - 115 commits from branch nodes/typescript:dev
• d12bc9e2 - Update index.ts

Compare with previous version

assigned to @moul

mentioned in commit 1119b28f

merged