A friend recently wrote (in response to a compliment):

嬉しい！嬉しく **てに** やけてしまいました。

I understand the meaning entirely, but it's the first time I've come across て
form followed immediately by に。A quick search of sample sentences on
Jisho.org, as well as a peek through my grammar book, revealed nothing. Is
this a common (or even grammatically correct) usage?
CC BY-SA 3.0
2017-06-15T23:00:59.203
48428
2017-06-15T23:05:57.547
19784
question
usage syntax
Use of て-form + に
You're not parsing it correctly, I'm afraid. It's 「嬉しくて、にやけてしまいました。」（にやける = to
grin, smirk）
CC BY-SA 3.0
2017-06-15T23:05:57.547
48429
2017-06-15T23:05:57.547
9831
48428
answer