Sometimes the keys of a map-object are not valid typescript identifiers, yet they are strongly typed members still. Invoking autocomplete within [''] does suggest them and, as you know, the string indexer is fully type-checked in such a situation.

Supposing I have members hello, return and delete on an object, can they be suggested in the dot-notation autocomplete as well and then just automatically converted to indexer form since?

myObj.            // should offer all members, `hello`, `return` and `delete`
myObj['return']   // choosing `return` replaced the dot-notation with indexed notation and completes the accessor